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This appendix lists the changes from version to version in the MySQL source code.
Note that we tend to update the manual at the same time we make changes to MySQL. If you find a version listed below that you can't find on the MySQL download page, this means that the version has not yet been released!
We have now started to work on MySQL 4.0. We will update this section as we add new features, so that others can follow our development.
Our TODO section contains what we plan to have in 4.0. See section H.1 Things that should be in 4.0.
MyISAM tables. Symlink handling is
now enabled by default for Windows.
SQL_CALC_FOUND_ROWS and FOUND_ROWS(). This makes it
possible to know how many rows a query would have returned
without a LIMIT clause.
SHOW OPEN TABLES.
SELECT expression LIMIT ....
IDENTITY as a synonym for AUTO_INCREMENT (like Sybase).
ORDER BY syntax to UPDATE and DELETE.
SELECT DISTINCT * from table_name ORDER by key_part1 LIMIT #
The 3.23 release has several major features that are not present in previous versions. We have added three new table types:
Note that only MyISAM is available in the standard binary distribution.
The 3.23 release also includes support for database replication between a master and many slaves, full-text indexing, and much more.
All new features are being developed in the 4.0 version. Only bug fixes and minor enhancements to existing features will be added to 3.23.
The replication code and BerkeleyDB code is still not as tested and as the rest of the code, so we will probably need to do a couple of future releases of 3.23 with small fixes for this part of the code. As long as you don't use these features, you should be quite safe with MySQL 3.23!
Note that the above doesn't mean that replication or Berkeley DB don't work; We have done a lot of testing of all code, including replication and BDB without finding any problems. It only means that not as many users use this code as the rest of the code and because of this we are not yet 100% confident in this code.
AUTO_INCREMENT column, the
AUTO_INCREMENT sequence wasn't reset.
CREATE .. SELECT now creates not unique indexes delayed.
LOCK TABLES table_name READ followed by
FLUSH TABLES put a exclusive lock on the table.
REAL @variables with was represented with 2 digits when
converted to strings.
LOAD TABLE FROM MASTER failed.
myisamchk --fast --force will no longer repair tables
that only had the open count wrong.
-lcma thread library on HP-UX 10.20 to
get MySQL more stable on HP-UX.
IF() and number of decimals in the result.
INSERT DELAYED was waiting for
a LOCK TABLE.
MERGE tables and big tables (> 4G) when using
ORDER BY.
SELECT from MERGE table
sometimes results in incorrectly ordered rows.
REPLACE() when using the ujis character set.
--skip-stack-trace to mysqld.
CREATE TEMPORARY now works with InnoDB tables.
InnoDB now promotes sub keys to whole keys.
CONCURRENT to LOAD DATA.
max_allowed_packet is too low to
read a very long log event from the master.
SELECT DISTINCT ... HAVING.
SHOW CREATE TABLE now returns TEMPORARY for temporary tables.
Rows_examined to slow query log.
WHERE that didn't match any rows.
mysqlcheck.
CHECK,
REPAIR, OPTIMIZE.
SELECT * FROM table_name,table_name2 ... ORDER BY key_part1 LIMIT #
will use index on key_part1 instead of filesort.
LOCK TABLE to_table WRITE,...; INSERT INTO to_table... SELECT ...
when to_table was empty.
LOCK TABLE and BDB tables.
MATCH in HAVING clause.
HEAP tables with LIKE.
--mysql-version to safe_mysqld
INNOBASE to InnoDB (because the INNOBASE
name was already used). All configure options and mysqld
start options are now using innodb instead of innobase. This
means that you have to change any configuration files where you have used
innobase options before upgrading to this version!
CHAR(255) NULL columns.
master-host is not set, as
long as server-id is set and valid master.info is present
SET SQL_SLAVE_SKIP_COUNTER=1; SLAVE START after a manual sanity
check/correction of data integrity.
REGEXP() on 64-bit machines.
UPDATE and DELETE with WHERE unique_key_part IS NULL
didn't update/delete all rows.
INSERT DELAYED for tables that support transactions.
TEXT/BLOB column
with wrong date format.
ALTER TABLE and LOAD DATA INFILE that disabled
key-sorting. These commands should now be faster in most cases.
FLUSH or REPAIR) would not use indexes for the
next query.
ALTER TABLE to Innobase tables on FreeBSD.
mysqld variables myisam_max_sort_file_size and
myisam_max_extra_sort_file_size.
tis620 character set to make comparisons
case-independent and to fix a bug in LIKE for this character set.
NOTE: All tables that uses the tis620 character set must be
fixed with myisamchk -r or REPAIR TABLE !
--skip-safemalloc option to mysqld.
mysqld is run
as root.
FLUSH TABLES and TEMPORARY tables.
(Problem with freeing the key cache and error Can't reopen table...).
latin1
and another problem when using many columns.
DISTINCT and summary functions.
SET TRANSACTION ISOLATION LEVEL ...
SELECT ... FOR UPDATE.
MySQL
was compiled without transaction support.
UPDATE where keys weren't always used to find the
rows to be updated.
CONCAT_WS() where it returned wrong results.
CREATE ... INSERT and INSERT ... SELECT to not
allow concurrent inserts as this could make the binary log hard to repeat.
(Concurrent inserts are enabled if you are not using the binary or update log).
ORDER BY.
CLIENT_TRANSACTIONS.
SHOW VARIABLES when using INNOBASE tables.
SELECT DISTINCT didn't work.
SHOW ANALYZE for small tables.
INNOBASE support
to be compiled.
INNOBASE table handler and the BDB table handler
to the MySQL source distribution.
GEMINI tables.
INSERT DELAYED that caused threads to hang when
inserting NULL into an AUTO_INCREMENT column.
CHECK TABLE / REPAIR TABLE that could cause
a thread to hang.
REPLACE will not replace a row that conflicts with an
auto_increment generated key.
mysqld now only sets CLIENT_TRANSACTIONS in
mysql->server_capabilities if the server supports a
transaction-safe handler.
LOAD DATA INFILE to allow numeric values to be read into
ENUM and SET columns.
ALTER TABLE ... ORDER BY.
max_user_connections to mysqld.
max_allowed_packet, not the
arbitrary limit of 4 MB.
= in argument to --set-variable.
Waiting for table.
SHOW CREATE TABLE now dumps the UNION() for MERGE tables.
ALTER TABLE now remembers the old UNION() definition.
BDB table handler that occurred when using an index
on multi-part key where a key part may be NULL.
MAX() optimization on sub-key for BDB tables.
BDB
tables and BLOB or TEXT fields when joining many tables.
BDB tables and TEXT columns.
BLOB key where a const row wasn't found.
mysqlbinlog writes the timestamp value for each query.
This ensures that one gets same values for date functions like NOW()
when using mysqlbinlog to pipe the queries to another server.
--skip-gemini, --skip-bdb and
--skip-innobase to mysqld even if these databases are not
compiled in mysqld.
GROUP BY ... DESC.
SET code, when one ran SET @foo=bar,
where bar is a column reference, an error was not properly generated.
--character-sets-dir to myisampack.
REPAIR TABLE ... EXTENDED.
GROUP BY on an alias,
where the alias was the same as an existing column name.
SEQUENCE() as an example UDF function.
mysql_install_db to use BINARY for CHAR
columns in the privilege tables.
TRUNCATE table_name to TRUNCATE TABLE table_name
to use the same syntax as Oracle. Until 4.0 we will also allow
TRUNCATE table_name to not crash old code.
MyISAM tables when a BLOB was
first part of a multi-part key.
CASE didn't work with GROUP BY.
--sort-recover to myisamchk.
myisamchk -S and OPTIMIZE TABLE now work on Windows.
DISTINCT on results from functions that referred
to a group function, like:
SELECT a, DISTINCT SEC_TO_TIME(sum(a)) from table_name GROUP BY a, b;
libmysqlclient library.
Fixed bug in handling STOP event after ROTATE event in
replication.
DROP DATABASE.
Table_locks_immediate and Table_locks_waited status
variables.
master.info. This fixes a bug introduced in 3.23.32.
SET SQL_SLAVE_SKIP_COUNTER=n command to recover from
replication glitches without a full database copy.
max_binlog_size variable; the binary log will be rotated
automatically when the size crosses the limit.
Last_error, Last_errno, and Slave_skip_counter to
SHOW SLAVE STATUS.
MASTER_POS_WAIT() function.
SIGILL, and SIGBUS in addition to
SIGSEGV.
mysqltest to take care of the timing issues in the test
suite.
ALTER TABLE can now be used to change the definition for a
MERGE table.
MERGE tables on Windows.
--temp-pool option to mysqld. Using this option
will cause most temporary files created to use a small set of names,
rather than a unique name for each new file. This is to work around a
problem in the Linux kernel dealing with creating a bunch of new files
with different names. With the old behavior, Linux seems to "leak"
memory, as it's being allocated to the directory entry cache instead of
the disk cache.
BACKUP, RESTORE, CHECK, REPAIR, and
ANALYZE TABLE.
FULL to SHOW COLUMNS. Now we show the
privilege list for the columns only if this option is given.
SHOW LOGS when there weren't any BDB logs.
mysql_list_fields(). This is
to keep this code compatible with SHOW FIELDS.
MERGE tables didn't work on Windows.
SET PASSWORD=... on Windows.
TRIM("foo" from "foo") didn't return an empty string.
--with-version-suffix to configure.
mysql_close().
RESTORE TABLE when trying to restore from a non-existent
directory.
SET PASSWORD.
MASTER_POS_WAIT().
HAVING on an empty table could produce one result row when
it shouldn't.
HEAP tables on Windows.
SHOW TABLE STATUS didn't show correct average row length for tables
larger than 4G.
CHECK TABLE ... EXTENDED didn't check row links for fixed size tables.
MEDIUM to CHECK TABLE.
DECIMAL() keys on negative numbers.
HOUR() (and some other TIME functions) on a CHAR column
always returned NULL.
setrlimit() on Linux to get
-O --open-files-limit=# to work on Linux.
mysqld variable: bdb_version.
SELECT ... FROM t1 LEFT JOIN t2 ON (t1.a=t2.a) WHERE t1.a=t2.aIn this case the test in the
WHERE clause was wrongly optimized away.
MyISAM when deleting keys with possible NULL
values, but the first key-column was not a prefix-compressed text column.
mysql.server to read the mysql.server option section
instead of mysql_server.
safe_mysqld and mysql.server to also read the
server option section.
Threads_created status variable to mysqld.
SHOW OPEN TABLES command.
myisamdump works against old mysqld servers.
myisamchk -k# so that it works again.
LOCK TABLES will now automatically start a new transaction.
BDB tables to not use internal subtransactions and reuse
open files to get more speed.
--mysqld=# to safe_mysqld.
--fields-*-by and
--lines-terminated-by options to mysqldump and
mysqlimport. By Paul DuBois.
--safe-show-database to mysqld.
have_bdb, have_gemini, have_innobase,
have_raid and have_ssl to SHOW VARIABLES to make it
easy to test for supported extensions.
--open-files-limit to mysqld.
--open-files to --open-files-limit in
safe_mysqld.
HEAP tables
that had many keys.
--bdb-no-sync works.
--bdb-recover to --bdb-no-recover as recover should
be on by default.
--skip-networking on Debian Linux.
UNOPENED in error messages.
SHOW LOGS queries.
<=> operator.
REPLACE with BDB tables.
LPAD() and RPAD() will shorten the result string if it's longer
than the length argument.
SHOW LOGS command.
PRIMARY keys first, followed by
UNIQUE keys.
UPDATE involving multi-part keys where one
specified all key parts both in the update and the WHERE part. In
this case MySQL could try to update a record that didn't match
the whole WHERE part.
mysqld to report the
hostname as '' in some error messages.
HEAP type tables; the variable
max_heap_table_size wasn't used. Now either MAX_ROWS or
max_heap_table_size can be used to limit the size of a HEAP
type table.
bdb_lock_max to bdb_max_lock.
auto_increment on sub-fields for BDB tables.
ANALYZE of BDB tables.
ROLLBACK when you have updated a non-transactional table
you will get an error as a warning.
--bdb-shared-data to mysqld.
Slave_open_temp_tables.
binlog_cache_size and max_binlog_cache_size to
mysqld.
DROP TABLE, RENAME TABLE, CREATE INDEX and
DROP INDEX are now transaction endpoints.
DROP DATABASE on a symbolic linked database, both
the link and the original database is deleted.
DROP DATABASE works on OS/2.
SELECT DISTINCT ... table1 LEFT JOIN
table2 ... when table2 was empty.
--abort-slave-event-count and
--disconnect-slave-event-count options to mysqld for
debugging and testing of replication.
SHOW KEYS now shows whether or not key is FULLTEXT.
mysqld processes.
mysql_print_defaults instead of various hacks
to read the `my.cnf' files. In addition, the handling of various
paths has been made more consistent with how mysqld handles them
by default.
FULLTEXT indexes in one table.
REPAIR/OPTIMIZE.
Yuri Dario.
FLUSH TABLES table_name didn't always flush the index tree
to disk properly.
--bootstrap is now run in a separate thread. This fixes a problem
that caused mysql_install_db to core dump on some Linux machines.
mi_create() to use less stack space.
MATCH when used
with UNIQUE key.
crash-me and the MySQL benchmarks to also work
with FrontBase.
RESTRICT and CASCADE after DROP TABLE to make
porting easier.
--slow-log.
connect_timeout to mysql and mysqladmin.
connect_timeout as an alias for timeout for option files
read by mysql_options().
--pager[=...], --no-pager,
--tee=... and --no-tee to the mysql client. The
new corresponding interactive commands are pager, nopager,
tee and notee. See section 15.5 The Command-line Tool, mysql --help
and the interactive help for more information.
MyISAM table failed.
SELECT, UPDATE and INSERT
statements running. The symptom was that the UPDATE and
INSERT queries were locked for a long time while new SELECT
statements were executed before the updates.
options_files with mysql_options() the
return-found-rows option was ignored.
interactive-timeout in the option file that
is read by mysql_options(). This makes it possible to force
programs that run for a long time (like mysqlhotcopy) to use
interactive_timeout instead of wait_timeout.
--log-long-format then also queries that
do not use an index are logged, even if the query takes less than
long_query_time seconds.
LEFT JOIN which caused all columns in a reference
table to be NULL.
NATURAL JOIN without keys.
TEXT or BLOB.
DROP of temporary tables wasn't stored in the update/binary log.
SELECT DISTINCT * ... LIMIT # only returned one row.
strstr() for sparc and cleaned up
the `global.h' header file to avoid a problem with bad aliasing with
the compiler submitted with RedHat 7.0. (Reported by Trond Eivind Glomsrød)
--skip-networking now works properly on NT.
ISAM tables when a row with a length
of more than 65K was shortened by a single byte.
MyISAM when running multiple updating processes on
the same table.
FLUSH TABLE tablename.
--replicate-ignore-table, --replicate-do-table,
--replicate-wild-ignore-table, --replicate-wild-do-table.
IO_CACHE mechanism instead of
FILE to avoid OS problems when there are many files open.
--open-files and --timezone to safe_mysqld.
CREATE TEMPORARY TABLE ... SELECT ....
CREATE TABLE ... SELECT NULL.
large_file_support,net_read_timeout,
net_write_timeout and query_buffer_size to SHOW VARIABLES.
created_tmp_files and sort_merge_passes
to SHOW STATUS.
FOREIGN KEY definition.
TRUNCATE table_name as a synonym for
DELETE FROM table_name.
bdb_lock_max to mysqld.
mysql_connect() now aborts on Linux if the server doesn't answer in
timeout seconds.
SLAVE START did not work if you started with
--skip-slave-start and had not explicitly run CHANGE MASTER TO.
SHOW MASTER STATUS to be consistent with
SHOW SLAVE STATUS. (It now has no directory in the log name.)
PURGE MASTER LOGS TO.
SHOW MASTER LOGS.
--safemalloc-mem-limit option to mysqld to simulate memory
shortage when compiled --with-debug=full.
SHOW SLAVE STATUS was using an uninitialized mutex if the slave had
not been started yet.
ELT() and MAKE_SET() when the query used
a temporary table.
CHANGE MASTER TO without specifying MASTER_LOG_POS would
set it to 0 instead of 4 and hit the magic number in the master binlog.
ALTER TABLE ... ORDER BY ... syntax added. This will create the
new table with the rows in a specific order.
SHOW CREATE when using AUTO_INCREMENT columns.
mit-pthreads.
<> to work properly with NULL.
SUBSTRING_INDEX() and REPLACE().
(Patch by Alexander Igonitchev)
CREATE TEMPORARY TABLE IF NOT EXISTS not to give an error
if the table exists.
PRIMARY KEY in a BDB table, a hidden
PRIMARY KEY will be created.
LEFT JOIN in some cases preferred a full table scan when there was
no WHERE clause.
--log-slow-queries, don't count the time waiting for a lock.
MyISAM tables if you start mysqld with
--myisam-recover.
TYPE= keyword from CHECK and
REPAIR. Allow CHECK options to be combined. (You can still
use TYPE= but this usage is deprecated.)
--replicate-rewrite-db option to mysqld.
--skip-slave-start option to mysqld.
INSERT INTO foo(some_key)
values (1),(1)) erroneously terminated the slave thread.
DISTINCT is only used on columns
from some of the tables.
SHOW GRANTS didn't always show all column grants.
--default-extra-file=# to all MySQL clients.
INSERT statements now are initialized properly.
UPDATE didn't always work when used with a range on a timestamp that
was part of the key that was used to find rows.
FULLTEXT index when inserting a NULL column.
mkstemp() instead of tempnam(). Based
on a patch from John Jones.
databasename works as second argument to mysqlhotcopy.
UMASK and UMASK_DIR can now be specified in octal.
RIGHT JOIN. This makes RIGHT a reserved word.
@@IDENTITY as a synonym for LAST_INSERT_ID().
(This is for Visual Basic compatibility.)
myisamchk and REPAIR when using FULLTEXT
index.
LOAD DATA INFILE now works with FIFOs.
(Patch by Toni L. Harbaugh-Blackford.)
FLUSH LOGS broke replication if you specified a log name with an
explicit extension as the value of the log-bin option.
MyISAM with packed multi-part keys.
CHECK TABLE on Windows.
FULLTEXT index always used the koi8_ukr
character set.
CHECK TABLE.
MyISAM repair/reindex code didn't use the --tempdir
option for its temporary files.
BACKUP TABLE/RESTORE TABLE.
CHANGE MASTER TO when the slave did not have
the master to start with.
Time in the processlist for Connect of
the slave thread.
FLUSH MASTER if you didn't specify
a filename argument to --log-bin.
--memlock option to mysqld to lock mysqld
in memory on systems with the mlockall() call (like in Solaris).
HEAP tables didn't use keys properly. (Bug from 3.23.23.)
MERGE tables (keys, mapping, creation,
documentation...). See section 8.2 MERGE Tables.
mysqldump from 3.23 which caused some CHAR columns
not to be quoted.
analyze, check, optimize and repair code.
OPTIMIZE TABLE is now mapped to REPAIR with statistics and
sorting of the index tree. This means that for the moment it only
works on MyISAM tables.
ORDER BY bug with BDB tables.
mysqld couldn't remove the `.pid' file
under Windows.
--log-isam to log MyISAM tables instead of isam
tables.
CHECK TABLE to work on Windows.
pwrite() safe on Windows.
mysqld variable created_tmp_disk_tables.
TIMESTAMP(X) columns, MySQL now reports columns with X
other than 14 or 8 to be strings.
CHAR columns that may have characters with ASCII
values greater than 128 that was created or modified with 3.23.22 must
be repaired!
REPAIR TABLE or myisamchk before use!
--core-file to mysqld to get a core file on
Linux if mysqld dies on the SIGSEGV signal.
mysql now starts with option
--no-named-commands (-g) by default. This option can be
disabled with --enable-named-commands (-G). This may cause
incompatibility problems in some cases, for example, in SQL scripts that
use named commands without a semicolon, etc. ! Long format commands
still work from the first line.
DROP TABLE statements at
the same time.
LEFT JOIN on an
empty table.
mysqld with incorrect options.
free() bug in mysqlimport.
MyISAM index handling of
DECIMAL/NUMERIC keys.
MyISAM tables; In some contexts,
usage of MIN(key_part) or MAX(key_part) returned an empty set.
mysqlhotcopy to use the new FLUSH TABLES table_list
syntax. Only tables which are being backed up are flushed now.
--enable-thread-safe-client so
that both non-threaded (-lmysqlclient) and threaded
(-lmysqlclient_r) libraries are built. Users who linked
against a threaded -lmysqlclient will need to link against
libmysqlclient_r now.
RENAME command.
NULL in COUNT(DISTINCT ...).
ALTER TABLE, LOAD DATA INFILE on empty tables and
INSERT ... SELECT ... on empty tables to create non-unique indexes
in a separate batch with sorting. This will make the above calls much
faster when you have many indexes.
ALTER TABLE now logs the first used insert_id correctly.
BLOB column.
DATE_ADD/DATE_SUB where it returned a datetime instead
of a date.
***DEAD*** in SHOW PROCESSLIST.
pthread_rwlock_rdlock code.
SELECT on part keys works with BDB tables.
INSERT INTO bdb_table ... SELECT to work with BDB tables.
CHECK TABLE now updates key statistics for the table.
ANALYZE TABLE will now only update tables that have been changed
since thee last ANALYZE. Note that this is a new feature and tables
will not be marked to be analyzed until they are updated in any way with
3.23.23 or newer. For older tables, you have to do CHECK TABLE
to update the key distribution.
CHECK, ANALYZE,
REPAIR and SHOW CREATE commands.
CHANGE MASTER TO command.
FAST, QUICK EXTENDED check types to
CHECK TABLES.
myisamchk so that --fast and
--check-changed-tables are also honored with --sort-index and
--analyze.
LOAD TABLE FROM MASTER that did not lock the
table during index re-build.
LOAD DATA INFILE broke replication if the database was excluded
from replication.
SHOW SLAVE STATUS and SHOW MASTER STATUS.
SLAVE STOP now will not return until the slave thread actually exits.
MATCH function and FULLTEXT index type.
(For MyISAM files). This makes FULLTEXT a reserved word.
lex_hash.h is created properly for each MySQL
distribution.
MASTER and COLLECTION are not reserved words.
--slow-query-log didn't contain the whole queries.
gcc 2.96 (intel) and gcc 2.9
(Ia64) in gen_lex_hash.c.
host= in the
my.cnf file.
DATE_ADD()/DATE_SUB()
against a number.
-F, --fast for myisamchk. Added option
-C, --check-only-changed to myisamchk.
ANALYZE table_name to update key statistics for tables.
0x... to be regarded as integers by default.
SHOW PROCESSLIST.
auto-rehash on reconnect for the mysql client.
MyISAM, where the index file couldn't
get bigger than 64M.
SHOW MASTER STATUS and SHOW SLAVE STATUS.
mysql_character_set_name(MYSQL *mysql) function to the
MySQL C API.
ASCII 0 safe.
mysql_config script.
< or > with a char column that was only
partly indexed.
mysqladmin to use the CREATE DATABASE/DROP
DATABASE commands instead of the old deprecated API calls.
chown warning in safe_mysqld.
ORDER BY that was introduced in 3.23.19.
DELETE FROM tbl_name to do a drop+create of
the table if we are in AUTOCOMMIT mode. (Needed for BDB tables).
ISAM/MyISAM
index files gets full during an INSERT/UPDATE.
myisamchk didn't correctly update row checksum when used with
-ro (This only gave an warning in subsequent runs).
REPAIR TABLE so that it works with tables without indexes.
DROP DATABASE
LOAD TABLE FROM MASTER is sufficiently bug-free to announce it as
a feature.
MATCH and AGAINST are now reserved words.
DELETE FROM tbl_name removed the .frm file.
SHOW CREATE TABLE.
MyISAM table
when doing update based on key on a table with many keys and some key changed
values.
ORDER BY can now uses REF keys to find subset the rows
that needs to be sorted.
print_defaults to my_print_defaults to avoid
name confusion.
NULLIF() to work according to ANSI SQL99.
net_read_timeout and net_write_timeout as startup
parameters to mysqld.
myisamchk --sort-records
on a table with prefix compressed index.
BEGIN WORK (the same as BEGIN).
ORDER BY on a CONV() expression.
LOAD TABLE FROM MASTER
FLUSH MASTER and FLUSH SLAVE
FLUSH TABLES WITH READ LOCK to make a global lock suitable to
make a copy of MySQL data files.
CREATE TABLE ... SELECT ... PROCEDURE now works.
GROUP BY on VARCHAR/CHAR columns.
READ and a
WRITE lock.
RAID tables.
find_in_set() when the first argument was NULL.
LEFT JOIN and ORDER BY where the first
table had only one matching row.
my.cnf example files in the `support-files'
directory.
duplicated key problem when doing big GROUP BY's.
(This bug was probably introduced in 3.23.15).
INNER JOIN to match ANSI SQL.
NATURAL JOIN syntax.
BDB interface.
--no-defaults and --defaults-file to
safe_mysqld.sh and mysql_install_db.sh.
USE INDEX works with PRIMARY keys.
BEGIN statement to start a transaction in AUTOCOMMIT mode.
KILL now works on a thread that is locked on a 'write' to a dead client.
log-slave-updates to allow daisy-chaining the slaves.
pthread_t
is not the same as int.
INSERT DELAYED code when doing
ALTER TABLE.
INSERT DELAYED
TYPE=QUICK to CHECK and REPAIR.
REPAIR TABLE when the table was in use by other threads.
gdb when one does a lot of reconnects. This will also improve
systems where you can't use persistent connections.
UPDATE IGNORE will not abort if an update results in a
DUPLICATE_KEY error.
CREATE TEMPORARY TABLE commands in the update log.
delayed_key_writes tables and CHECK TABLE.
replicate-do-db and replicate-ignore-db options to
restrict which databases get replicated
SQL_LOG_BIN option
mysqld as root, you must now use the --user=root option.
FLUSH TABLES command.
slow_launch_time variable and the Slow_launch_threads
status variable to mysqld. These can be examined with
mysqladmin variables and mysqladmin extended-status.
INET_NTOA() and INET_ATON().
IF() now depends on the second and
third arguments and not only on the second argument.
myisamchk could go into a loop when trying to
repair a crashed table.
INSERT DELAYED to update log if SQL_LOG_UPDATE=0.
REPLACE on HEAP tables.
SHOW VARIABLES.
DELETE of many rows on a table with
compressed keys where MySQL scanned the index to find the rows.
CHECK on table with deleted keyblocks.
LAST_INSERT_ID() to update
a table with an auto_increment key.
NULLIF().
LOAD DATA INFILE on a table with
BLOB/TEXT columns.
EXPLAIN SELECT ... now also prints out whether MySQL needs to
create a temporary table or use file sorting when resolving the SELECT.
ORDER BY parts where the part is a
constant expression in the WHERE part. Indexes can now be used
even if the ORDER BY doesn't match the index exactly, as long as
all the not used index parts and all the extra ORDER BY
columns are constants in the WHERE clause. See section 13.4 How MySQL Uses Indexes.
UPDATE and DELETE on a whole unique key in the WHERE part,
is now faster than before.
RAID_CHUNKSIZE to be in 1024 byte increments.
CONCAT() where one of the arguments was a function
that returned a modified argument.
myisamchk, where it updated the header in
the index file when one only checked the table. This confused the
mysqld daemon if it updated the same table at the same time. Now
the status in the index file is only updated if one uses
--update-state. With older myisamchk versions you should
use --read-only when only checking tables, if there is the
slightest chance that the mysqld server is working on the table at the
same time!
DROP TABLE is logged in the update log.
DECIMAL() key field
where the column data contained leading zeros.
myisamchk when the auto_increment isn't the first key.
DATETIME in ISO8601 format: 2000-03-12T12:00:00
mysqld binary can now handle many different
character sets (you can choose which when starting mysqld).
REPAIR TABLE.
mysql_thread_safe().
UMASK_DIR environment variable.
CONNECTION_ID().
= on BLOB or VARCHAR BINARY keys, where
only a part of the column was indexed, the whole column of the result
row wasn't compared.
ORDER BY.
GROUP BY part.
LOCK TABLE command; This fixed the problem one got when running
the test-ATIS test with --fast or --check-only-changed.
SQL_BUFFER_RESULT to SELECT.
CHECK TABLE command.
mysqladmin shutdown will wait for the local server
to close down.
print_defaults to the `.rpm' files. Removed mysqlbug
from the client `.rpm' file.
MyISAM involving REPLACE ... SELECT ... which could
give a corrupted table.
myisamchk where it wrongly reset the auto_increment value.
DISTINCT on HEAP temporary tables to use hashed
keys to quickly find duplicated rows. This mostly concerns queries of
type SELECT DISTINCT ... GROUP BY .... This fixes a problem where
not all duplicates were removed in queries of the above type. In
addition, the new code is MUCH faster.
IF NOT EXISTS to CREATE DATABASE.
--all-databases and --databases to mysqldump
to allow dumping of many databases at the same time.
DECIMAL() index in MyISAM tables.
mysqladmin shutdown on a local connection, mysqladmin now
waits until the pidfile is gone before terminating.
COUNT(DISTINCT ...) queries.
myisamchk works properly with RAID:ed tables.
LEFT JOIN and key_field IS NULL.
net_clear() which could give the error Aborted
connection in the MySQL clients.
USE INDEX (key_list) and IGNORE INDEX (key_list) as
join parameters in SELECT.
DELETE and RENAME should now work on RAID tables.
ALTER TABLE tbl_name ADD (field_list) syntax.
GRANT/REVOKE ALL PRIVILEGES doesn't affect
GRANT OPTION.
) from the output of SHOW GRANTS
UNIQUE INDEX in CREATE statements.
mysqlhotcopy - fast on-line hot-backup utility for local
MySQL databases. By Tim Bunce.
mysqlaccess. Thanks to Steve Harvey for this.
--i-am-a-dummy and --safe-updates to mysql.
select_limit and max_join_size to mysql.
SQL_MAX_JOIN_SIZE and SQL_SAFE_UPDATES.
READ LOCAL lock that doesn't lock the table for concurrent
inserts. (This is used by mysqldump).
LOCK TABLES ... READ doesn't anymore allow concurrent
inserts.
--skip-delay-key-write to mysqld.
_rowid can now be used as an alias for an integer type unique indexed
column.
SIGPIPE when compiling with --thread-safe-clients
to make things safe for old clients.
LOCK TABLES.
INSERT DELAYED.
date_column BETWEEN const_date AND const_date works.
NULL in a table with
BLOB/TEXT columns.
WHERE K1=1 and K3=2 and (K2=2 and K4=4 or K2=3 and K4=5)
source to mysql to allow reading of batch files
inside the mysql client. Original patch by Matthew Vanecek.
WITH GRANT OPTION option.
GRANT error when using tables from many
databases in the same query.
SELECT when using many overlapping indexes.
MySQL should now be able to choose keys even better when there
is many keys to choose from.
SELECT * from key_part_1=const and key_part_2 > const2
VARCHAR columns to CHAR columns
didn't change row type from dynamic to fixed.
SELECT floor(pow(2,63)).
mysqld startup option --delay-key-write to
--delay-key-write-for-all-tables
read-next-on-key to HEAP tables. This should fix all
problems with HEAP tables when using not UNIQUE keys.
--log-slow-queries to mysqld to log all queries that take a
long time to a separate log file with a time of how long the query took.
WHERE key_column=RAND(...)
SELECT ... LEFT JOIN ... key_column IS NULL,
when key_column could contain NULL values.
LOAD DATA INFILE.
NISAM.
ISAM when doing some ORDER BY ... DESC queries.
--delay-key-write didn't enable delayed key writing.
TEXT column which only involved case changes.
INSERT DELAYED doesn't update timestamps that are given.
YEARWEEK() and options x, X, v and
V to DATE_FORMAT().
MAX(indexed_column) and HEAP tables.
BLOB NULL keys and LIKE "prefix%".
MyISAM and fixed-length rows < 5 bytes.
GROUP BY queries.
ENUM field value
was too big.
pthread_mutex_timedwait,
which is used with INSERT DELAYED. See section 4.12.5 Linux Notes (All Linux Versions).
MyISAM with keys > 250 characters.
MyISAM one can now do an INSERT at the same time as other
threads are reading from the table.
max_write_lock_count to mysqld to force a
READ lock after a certain number of WRITE locks.
delayed_key_write on show variables.
concurrency to thread_concurrency.
LOCATE(substr,str), POSITION(substr IN str),
LOCATE(substr,str,pos), INSTR(str,substr),
LEFT(str,len), RIGHT(str,len),
SUBSTRING(str,pos,len), SUBSTRING(str FROM pos FOR len),
MID(str,pos,len), SUBSTRING(str,pos), SUBSTRING(str
FROM pos), SUBSTRING_INDEX(str,delim,count), RTRIM(str),
TRIM([[BOTH | TRAILING] [remstr] FROM] str),
REPLACE(str,from_str,to_str), REVERSE(str),
INSERT(str,pos,len,newstr), LCASE(str), LOWER(str),
UCASE(str) and UPPER(str); Patch by Wei He.
FULL to SHOW PROCESSLIST.
--verbose to mysqladmin.
REPLACE() and LOAD DATA INFILE.
mysqld variable interactive_timeout.
mysql_data_seek() from ulong to
ulonglong.
mysqld option -O lower_case_table_names={0|1} to allow
users to force table names to lowercase.
SELECT ... INTO DUMPFILE.
mysqld option --ansi to make some functions ANSI SQL
compatible.
#sql.
` (" in --ansi mode).
[floor() overflow safe on FreeBSD.
--quote-names to mysqldump
PRIMARY KEY NOT NULL.
encrypt() to be thread safe and not reuse buffer.
mysql_odbc_escape_string() function to support big5 characters in
MyODBC.
FLOAT and DOUBLE (without any length modifiers) are
not anymore fixed decimal point numbers.
FLOAT(X): Now this is the same as FLOAT if
X <= 24 and a DOUBLE if 24 < X <= 53.
DECIMAL(X) is now an alias for DECIMAL(X,0) and DECIMAL
is now an alias for DECIMAL(10,0). The same goes for NUMERIC.
ROW_FORMAT={default | dynamic | static | compressed} to
CREATE_TABLE.
DELETE FROM table_name didn't work on temporary tables.
CHAR_LENGTH() to be multi-byte character safe.
ORD(string).
SELECT DISTINCT ... ORDER BY RAND().
ALTER TABLE + adding a column after the last field didn't work.
CREATE TABLE foo (a int not null auto_increment, b char(5), primary key (b,a))
NULL.
AS on fieldname with CREATE TABLE table_name SELECT ... didn't
work.
NATIONAL and NCHAR when defining character columns.
This is the same as not using BINARY.
NULL columns in a PRIMARY KEY (only in UNIQUE
keys).
LAST_INSERT_ID if one uses this in ODBC:
WHERE auto_increment_column IS NULL. This seems to fix some problems
with Access.
SET SQL_AUTO_IS_NULL=0|1 now turns on/off the handling of
searching after the last inserted row with WHERE
auto_increment_column IS NULL.
mysqld variable concurrency for Solaris.
--relative to mysqladmin to make
extended-status more useful to monitor changes.
COUNT(DISTINCT ...) on an empty table.
LOAD DATA INFILE and BLOB columns.
~ (negation).
UDF functions.
DATETIME into a TIME column will not anymore
try to store 'days' in it.
SUM().)
LIKE "%" on an index that may have NULL values.
REVOKE ALL PRIVILEGES didn't revoke all privileges.
SHOW GRANTS FOR user (by Sinisa).
date_add syntax: date/datetime + INTERVAL # interval_type.
By Joshua Chamas.
LOAD DATA REPLACE.
REGEXP is now case insensitive if you use non-binary strings.
ASC is now the default again for ORDER BY.
LIMIT to UPDATE.
mysql_change_user().
SHOW VARIABLES.
--[whitespace] comments.
INSERT into tbl_name VALUES (), that is, you may now specify
an empty value list to insert a row in which each column is set to its
default value.
SUBSTRING(text FROM pos) to conform to ANSI SQL. (Before this
construct returned the rightmost 'pos' characters).
SUM() with GROUP BY returned 0 on some systems.
SHOW TABLE STATUS.
DELAY_KEY_WRITE option to CREATE TABLE.
AUTO_INCREMENT on any key part.
YEAR(NOW()) and YEAR(CURDATE()).
CASE construct.
COALESCE().
SELECT * FROM table_name WHERE
key_part1 >= const AND (key_part2 = const OR key_part2 = const). The
bug was that some rows could be duplicated in the result.
myisamchk without -a updated the index
distribution wrong.
SET SQL_LOW_PRIORITY_UPDATES=1 gave parse error before.
WHERE clause.
UPDATE tbl_name SET KEY=KEY+1 WHERE KEY > 100
SELECT ... WHERE key_part1=const1 AND
key_part_2=const2 AND key_part1=const4 AND key_part2=const4 ; Indextype
should be range instead of ref.
egcs 1.1.2 optimizer bug (when using BLOBs) on Linux Alpha.
LOCK TABLES combined with DELETE FROM table.
NULL and BLOB/TEXT columns.
SELECT ... FROM t1 LEFT JOIN t2 ON ... WHERE t2.not_null_column IS NULL.
ORDER BY and GROUP BY can be done on functions.
ORDER BY RAND().
WHERE key_column = function.
WHERE key_column = column_name even if
the columns are not identically packed.
WHERE column_name IS NULL.
--init-file=file_name to mysqld.
COUNT(DISTINCT value, [value, ...])
CREATE TEMPORARY TABLE now creates a temporary table, in its own
namespace, that is automatically deleted if connection is dropped.
CASE): CASE, THEN, WHEN, ELSE and END.
EXPORT_SET() and MD5().
MyISAM) with a lot of new features.
See section 8.1 MyISAM Tables.
HEAP tables which are extremely fast for
lookups.
LOAD_FILE(filename) to get the contents of a file as a
string value.
<=> which will act as = but will return TRUE
if both arguments are NULL. This is useful for comparing changes
between tables.
EXTRACT(interval FROM datetime) function.
FLOAT(X) is not rounded on storage and may be
in scientific notation (1.0 E+10) when retrieved.
REPLACE is now faster than before.
LIKE character comparison to behave as =;
This means that 'e' LIKE ''e' (if the line doesn't display
correctly, the latter 'e' means a French 'e' with a dot above) is now true.
SHOW TABLE STATUS returns a lot of information about the tables.
LIKE to the SHOW STATUS command.
SHOW COLUMNS.
packed and comment to SHOW INDEX.
CREATE TABLE ... COMMENT "xxx").
UNIQUE, as in
CREATE TABLE table_name (col int not null UNIQUE)
CREATE TABLE table_name SELECT ...
CREATE TABLE IF NOT EXISTS ...
CHAR(0) columns.
DATE_FORMAT() now requires `%' before any format character.
DELAYED is now a reserved word (sorry about that :( ).
analyse, file: `sql_analyse.c'.
This will describe the data in your query. Try the following:
SELECT ... FROM ... WHERE ... PROCEDURE ANALYSE([max elements,[max memory]])This procedure is extremely useful when you want to check the data in your table!
BINARY cast to force a string to be compared case sensitively.
--skip-show-database to mysqld.
UPDATE now also works with
BLOB/TEXT columns.
INNER join syntax. NOTE: This made INNER
a reserved word!
IP/NETMASK syntax.
NOT NULL DATE/DATETIME column with IS
NULL, this is changed to a compare against 0 to satisfy some ODBC
applications. (By shreeve@uci.edu).
NULL IN (...) now returns NULL instead of 0. This will
ensure that null_column NOT IN (...) doesn't match
NULL values.
TIME columns.
TIME strings to be more strict. Now the
fractional second part is detected (and currently skipped). The
following formats are supported:
[[DAYS] [H]H:]MM:]SS[.fraction]
[[[[[H]H]H]H]MM]SS[.fraction]
DATETIME.
LOW_PRIORITY attribute to LOAD DATA INFILE.
LOAD DATA INFILE.
DECIMAL(x,y) now works according to ANSI SQL.
LAST_INSERT_ID() is now updated for INSERT INTO ... SELECT.
SELECT DISTINCT is much faster; It uses the new UNIQUE
functionality in MyISAM. One difference compared to MySQL Version 3.22
is that the output of DISTINCT is not sorted anymore.
mysql_num_fields() on
a MYSQL object, you must use mysql_field_count() instead.
LIBEWRAP; Patch by Henning P . Schmiedehausen.
AUTO_INCREMENT for other than numerical columns.
AUTO_INCREMENT will now automatically make the column
NOT NULL.
NULL as the default value for AUTO_INCREMENT columns.
SQL_BIG_RESULT; SQL_SMALL_RESULT is now default.
--enable-large-files/--disable-large-files switch to
configure. See `configure.in' for some systems where this is
automatically turned off because of broken implementations.
readline to 4.0.
CREATE TABLE options: PACK_KEYS and CHECKSUM.
mysqld option --default-table-type.
The 3.22 version has faster and safer connect code than version 3.21, as well as a lot of new nice enhancements. The reason for not including these changes As there aren't really any MAJOR changes, upgrading from 3.21 to 3.22 should be very easy and painless. See section 4.18.2 Upgrading from Version 3.21 to Version 3.22.
STD().
ISAM library from 3.23.
INSERT DELAYED.
LEFT JOIN/STRAIGHT_JOIN
on a table with only one row.
GROUP BY on TINYBLOB columns; This
caused bugzilla to not show rows in some queries.
LOCK TABLE
SELECT DISTINCT queries.
mysqlhotcopy - fast on-line hot-backup utility for local MySQL
databases. By Tim Bunce.
mysqlaccess. Thanks to Steve Harvey for this.
GROUP functions.
ISAM code when deleting rows on tables with
packed indexes.
SELECT when using many overlapping indexes.
SELECT floor(pow(2,63)).
WITH GRANT OPTION option.
GROUP BY queries.
ENUM field value
was too big.
mysqlshutdown.exe and mysqlwatch.exe to the Windows
distribution.
ORDER BY on a reference key.
INSERT DELAYED doesn't update timestamps that are given.
LEFT JOIN and COUNT() on a column which
was declared NULL + and it had a DEFAULT value.
CONCAT() in a WHERE clause.
AVG() and STD() with NULL values.
ROUND() will now work on Windows.
BLOB/TEXT column to REVERSE().
/*! */ with version numbers.
SUBSTRING(text FROM pos) to conform to ANSI SQL. (Before this
construct returned the rightmost 'pos' characters).
LOCK TABLES combined with DELETE FROM table
SET SQL_LOW_PRIORITY_UPDATES=# didn't work.
GRANT ... IDENTIFIED BY
SELECT * FROM table_name WHERE key_part1 >= const AND (key_part2 = const OR key_part2 = const)
DATA is not a reserved word anymore.
LOCK TABLES table_name READ; FLUSH TABLES;
isamchk should now work on Windows.
libtool 1.3.2.
configure.
--defaults-file=### to option file handling to force use
of only one specific option file.
CREATE syntax to ignore MySQL Version 3.23 keywords.
INSERT DELAYED on a table locked with
LOCK TABLES.
DROP TABLE on a table that was
locked by another thread.
GRANT/REVOKE commands in the update log.
isamchk to detect a new error condition.
NATURAL LEFT JOIN.
mysql_close() directly after
mysql_init().
delayed_insert_thread counting when you couldn't create a new
delayed_insert thread.
CONCAT() with many arguments.
DELETE FROM TABLE when table was locked by
another thread.
LEFT JOIN involving empty tables.
mysql.db column from char(32) to char(60).
MODIFY and DELAYED are not reserved words anymore.
TIME column.
Host '...' is not allowed to connect to this MySQL
server after one had inserted a new MySQL user with a GRANT
command.
TCP_NODELAY also on Linux (Should give faster TCP/IP
connections).
STD() for big tables when result should be 0.
INSERT DELAYED had some garbage at end in the update log.
mysql_install_db (from 3.22.17).
BLOB
columns.
shutdown
all threads didn't die properly.
-O flush_time=# to mysqld. This is mostly
useful on Windows and tells how often MySQL should close all
unused tables and flush all updated tables to disk.
VARCHAR column compared with CHAR column
didn't use keys efficiently.
--log-update and connecting
without a default database.
configure and portability problems.
LEFT JOIN on tables that had circular dependencies caused
mysqld to hang forever.
mysqladmin processlist could kill the server if a new user logged in.
DELETE FROM tbl_name WHERE key_column=col_name didn't find any matching
rows. Fixed.
DATE_ADD(column, ...) didn't work.
INSERT DELAYED could deadlock with status 'upgrading lock'
ENCRYPT() to take longer salt strings than 2 characters.
longlong2str is now much faster than before. For Intel x86
platforms, this function is written in optimized assembler.
MODIFY keyword to ALTER TABLE.
GRANT used with IDENTIFIED BY didn't take effect until privileges
were flushed.
SHOW STATUS.
ORDER BY with 'only index' optimization when there
were multiple key definitions for a used column.
DATE and DATETIME columns are now up to 5 times faster than
before.
INSERT DELAYED can be used to let the client do other things while the
server inserts rows into a table.
LEFT JOIN USING (col1,col2) didn't work if one used it with tables
from 2 different databases.
LOAD DATA LOCAL INFILE didn't work in the Unix version because of
a missing file.
VARCHAR/BLOB on very short rows (< 4 bytes);
error 127 could occur when deleting rows.
BLOB/TEXT through formulas didn't work for short (< 256 char)
strings.
GRANT on a new host, mysqld could die on the first
connect from this host.
ORDER BY on column name that was the same
name as an alias.
BENCHMARK(loop_count,expression) function to time expressions.
mysqld to make it easier to start from shell
scripts.
TIMESTAMP column to NULL didn't record the timestamp
value in the update log.
INSERT INTO TABLE ... SELECT ... GROUP BY.
localtime_r() on Windows so that it will not crash
anymore if your date is > 2039, but instead will return a time of all zero.
^Z (ASCII 26) to \Z as ^Z doesn't
work with pipes on Windows.
mysql_fix_privileges adds a new column to the mysql.func to
support aggregate UDF functions in future MySQL releases.
NOW(), CURDATE() or CURTIME() directly in a
column didn't work.
SELECT COUNT(*) ... LEFT JOIN ... didn't work with no WHERE part.
pthread_cond() on the Windows version.
get_lock() now correctly times out on Windows!
DATE_ADD() and DATE_SUB() in a
WHERE clause.
GRANT ... TO user
IDENTIFIED BY 'password' syntax.
GRANT checking with SELECT on many tables.
mysql_fix_privilege_tables to the RPM
distribution. This is not run by default because it relies on the client
package.
SQL_SMALL_RESULT to SELECT to force use of
fast temporary tables when you know that the result set will be small.
DATE_ADD/DATE_SUB() doesn't have enough days.
GRANT compares columns in case-insensitive fashion.
ALTER TABLE dump core in
some contexts.
user@hostname can now include `.' and `-'
without quotes in the context of the GRANT, REVOKE and
SET PASSWORD FOR ... statements.
isamchk for tables which need big temporary files.
mysql_fix_privilege_tables script
when you upgrade to this version! This is needed because of the new
GRANT system. If you don't do this, you will get Access
denied when you try to use ALTER TABLE, CREATE INDEX or
DROP INDEX.
GRANT to allow/deny users table and column access.
USER() to return user@host
PASSWORD for another user.
FLUSH STATUS that sets most status variables to zero.
aborted_threads, aborted_connects.
connection_timeout.
SET SQL_WARNINGS=1 to get a warning count also for simple
inserts.
SIGTERM instead of SIGQUIT with
shutdown to work better on FreeBSD.
\G (print vertically) to mysql.
SELECT HIGH_PRIORITY ... killed mysqld.
IS NULL on a AUTO_INCREMENT column in a LEFT JOIN didn't
work as expected.
MAKE_SET().
mysql_install_db no longer starts the MySQL server! You
should start mysqld with safe_mysqld after installing it! The
MySQL RPM will, however, start the server as before.
--bootstrap option to mysqld and recoded
mysql_install_db to use it. This will make it easier to install
MySQL with RPMs.
+, - (sign and minus), *, /, %,
ABS() and MOD() to be BIGINT aware (64-bit safe).
ALTER TABLE that caused mysqld to crash.
INSERT).
INSERT INTO tbl_name SET col_name=value, col_name=value, ...
MYSQL_INIT_COMMAND to mysql_options() to make
a query on connect or reconnect.
MYSQL_READ_DEFAULT_FILE and
MYSQL_READ_DEFAULT_GROUP to mysql_options() to read the
following parameters from the MySQL option files: port,
socket, compress, password, pipe, timeout,
user, init-command, host and database.
maybe_null to the UDF structure.
IGNORE to INSERT statements with many rows.
isamchk -rq on each table that has an index on
a CHAR or VARCHAR column.
mysql_setpermission, by Luuk de Boer, allows one
to easily create new users with permissions for specific databases.
LOAD DATA INFILE).
SHOW STATUS and changed format of output to
be like SHOW VARIABLES.
extended-status command to mysqladmin which will show the
new status variables.
SET SQL_LOG_UPDATE=0 caused a lockup of the server.
FLUSH [ TABLES | HOSTS | LOGS | PRIVILEGES ] [, ...]
KILL thread_id.
ALTER TABLE from a INT
to a short CHAR() column.
SELECT HIGH_PRIORITY; This will get a lock for the
SELECT even if there is a thread waiting for another
SELECT to get a WRITE LOCK.
LIKE on
BLOB/TEXT columns with \0.
ESCAPE option to LIKE.
mysqladmin debug.
mysqld on Windows with the --flush option.
This will flush all tables to disk after each update. This makes things
much safer on NT/Win98 but also MUCH slower.
my_strcoll()! The patch should always be safe to install (for any system),
but as this patch changes ISAM internals it's not yet in the default
distribution.
DATE_ADD() and DATE_SUB() didn't work with group functions.
mysql will now also try to reconnect on USE DATABASE commands.
ORDER BY and LEFT JOIN and const tables.
ORDER BY if the first ORDER BY column
was a key and the rest of the ORDER BY columns wasn't part of the key.
OPTIMIZE TABLE.
DROP TABLE and mysqladmin shutdown on Windows
(a fatal bug from 3.22.6).
TIME columns and negative strings.
LIMIT clause for the DELETE statement.
/*! ... */ syntax to hide MySQL-specific
keywords when you write portable code. MySQL will parse the code
inside the comments as if the surrounding /*! and */ comment
characters didn't exist.
OPTIMIZE TABLE tbl_name can now be used to reclaim disk space
after many deletes. Currently, this uses ALTER TABLE to
regenerate the table, but in the future it will use an integrated
isamchk for more speed.
libtool to get the configure more portable.
UPDATE and DELETE operations when using
DATETIME or DATE keys.
mysqladmin proc to display information about your own
threads. Only users with the Process_priv privilege can get
information about all threads.
YYMMDD, YYYYMMDD,
YYMMDDHHMMSS for numbers when using DATETIME and
TIMESTAMP types. (Formerly these formats only worked with strings.)
CLIENT_IGNORE_SPACE to allow use of spaces
after function names and before `(' (Powerbuilder requires this).
This will make all function names reserved words.
--log-long-format option to mysqld to enable timestamps
and INSERT_ID's in the update log.
--where option to mysqldump (patch by Jim Faucette).
mysqldump.
LOAD DATA INFILE statement, you can now use the new LOCAL
keyword to read the file from the client. mysqlimport will
automatically use LOCAL when importing with the TCP/IP protocol.
DROP TABLE, ALTER TABLE, DELETE FROM
TABLE and mysqladmin flush-tables under heavy usage.
Changed locking code to get better handling of locks of different types.
DBI to 1.00 and DBD to 1.2.0.
mysqld. (To avoid errors if you accidentally
try to use an old error message file.)
affected_rows(),
insert_id(), ...) are now of type BIGINT to allow 64-bit values
to be used.
This required a minor change in the MySQL protocol which should affect
only old clients when using tables with AUTO_INCREMENT values > 16M.
mysql_fetch_lengths() has changed from uint *
to ulong *. This may give a warning for old clients but should work
on most machines.
mysys and dbug libraries to allocate all thread variables
in one struct. This makes it easier to make a threaded `libmysql.dll'
library.
gethostname() (instead of uname()) when
constructing `.pid' file names.
COUNT(), STD() and AVG() are extended to handle more than
4G rows.
-838:59:59 <= x <=
838:59:59 in a TIME column.
TIME column to too short a value, MySQL now
assumes the value is given as: [[[D ]HH:]MM:]SS instead of
HH[:MM[:SS]].
TIME_TO_SEC() and SEC_TO_TIME() can now handle negative times
and hours up to 32767.
SET OPTION SQL_LOG_UPDATE={0|1} to allow users with
the process privilege to bypass the update log.
(Modified patch from Sergey A Mukhin violet@rosnet.net.)
LPAD().
BLOB reading from
pipes safer.
-O max_connect_errors=# option to mysqld.
Connect errors are now reset for each correct connection.
max_allowed_packet to 1M in
mysqld.
--low-priority-updates option to mysqld, to give
table-modifying operations (INSERT, REPLACE, UPDATE,
DELETE) lower priority than retrievals. You can now use
{INSERT | REPLACE | UPDATE | DELETE} LOW_PRIORITY ... You can
also use SET OPTION SQL_LOW_PRIORITY_UPDATES={0|1} to change
the priority for one thread. One side effect is that LOW_PRIORITY
is now a reserved word. :(
INSERT INTO table ... VALUES(...),(...),(...),
to allow inserting multiple rows with a single statement.
INSERT INTO tbl_name is now also cached when used with LOCK TABLES.
(Previously only INSERT ... SELECT and LOAD DATA INFILE were
cached.)
GROUP BY functions with HAVING:
mysql> SELECT col FROM table GROUP BY col HAVING COUNT(*)>0;
mysqld will now ignore trailing `;' characters in queries. This
is to make it easier to migrate from some other SQL servers that require the
trailing `;'.
SELECT INTO OUTFILE.
GREATEST() and LEAST() functions. You must now use
these instead of the MAX() and MIN() functions to get the
largest/smallest value from a list of values. These can now handle REAL,
BIGINT and string (CHAR or VARCHAR) values.
DAYOFWEEK() had offset 0 for Sunday. Changed the offset to 1.
GROUP BY columns and fields when
there is no GROUP BY specification.
--vertical option to mysql, for printing results in
vertical mode.
--tmpdir option to mysqld, for specifying the location
of the temporary file directory.
SELECT ... FROM table WHERE auto_increment_column IS NULLto:
SELECT ... FROM table WHERE auto_increment_column == LAST_INSERT_ID()This allows some ODBC programs (Delphi, Access) to retrieve the newly inserted row to fetch the
AUTO_INCREMENT id.
DROP TABLE now waits for all users to free a table before deleting it.
BIN(), OCT(), HEX() and CONV() for
converting between different number bases.
SUBSTRING() with 2 arguments.
ORDER BY and
GROUP BY.
mysqld now automatically disables system locking on Linux and Windows,
and for systems that use MIT-pthreads. You can force the use of locking
with the --enable-locking option.
--console option to mysqld, to force a console window
(for error messages) when using Windows.
DATE_ADD() and DATE_SUB() functions.
mysql_ping() to the client library.
--compress option to all MySQL clients.
byte to char in `mysql.h' and `mysql_com.h'.
<<, >>, RPAD() and LPAD().
ORDER BY to work when no records are found
when using fields that are not in GROUP BY (MySQL extension).
--chroot option to mysqld, to start mysqld in
a chroot environment (by Nikki Chumakov nikkic@cityline.ru).
--one-thread option to mysqld, for debugging with
LinuxThreads (or glibc). (This replaces the -T32 flag)
DROP TABLE IF EXISTS to prevent an error from occurring if the
table doesn't exist.
IF and EXISTS are now reserved words (they would have to
be sooner or later).
mysqldump.
mysql_ping().
mysql_init() and mysql_options().
You now MUST call mysql_init() before you call
mysql_real_connect().
You don't have to call mysql_init() if you only use
mysql_connect().
mysql_options(...,MYSQL_OPT_CONNECT_TIMEOUT,...) so you can set a
timeout for connecting to a server.
--timeout option to mysqladmin, as a test of
mysql_options().
AFTER column and FIRST options to
ALTER TABLE ... ADD columns.
This makes it possible to add a new column at some specific location
within a row in an existing table.
WEEK() now takes an optional argument to allow handling of weeks when
the week starts on Monday (some European countries). By default,
WEEK() assumes the week starts on Sunday.
TIME columns weren't stored properly (bug in MySQL Version 3.22.0).
UPDATE now returns information about how many rows were
matched and updated, and how many ``warnings'' occurred when doing the update.
FORMAT(-100,2).
ENUM and SET columns were compared in binary (case-sensitive)
fashion; changed to be case insensitive.
mysql_real_connect() cal