D.4.27 Changes in release 3.23.33 (09 Feb 2001)

• Fixed DNS lookups not to use the same mutex as the hostname cache. This will enable known hosts to be quickly resolved even if a DNS lookup takes a long time.
• Added --character-sets-dir option to myisampack.
• Removed warnings when running REPAIR TABLE ... EXTENDED.
• Fixed a bug that caused a core dump when using GROUP BY on an alias, where the alias was the same as an existing column name.
• Added SEQUENCE() as an example UDF function.
• Changed mysql_install_db to use BINARY for CHAR columns in the privilege tables.
• Changed TRUNCATE tbl_name to TRUNCATE TABLE tbl_name to use the same syntax as Oracle. Until 4.0 we will also allow TRUNCATE tbl_name to not crash old code.
• Fixed ``no found rows'' bug in MyISAM tables when a BLOB was first part of a multi-part key.
• Fixed bug where CASE didn't work with GROUP BY.
• Added --sort-recover option to myisamchk.
• myisamchk -S and OPTIMIZE TABLE now work on Windows.
• Fixed bug when using DISTINCT on results from functions that referred to a group function, like:

  SELECT a, DISTINCT SEC_TO_TIME(SUM(a))
  FROM tbl_name GROUP BY a, b;
  

• Fixed buffer overrun in libmysqlclient library. Fixed bug in handling STOP event after ROTATE event in replication.
• Fixed another buffer overrun in DROP DATABASE.
• Added Table_locks_immediate and Table_locks_waited status variables.
• Fixed bug in replication that broke slave server start with existing `master.info'. This fixes a bug introduced in 3.23.32.
• Added SET SQL_SLAVE_SKIP_COUNTER=n command to recover from replication glitches without a full database copy.
• Added max_binlog_size variable; the binary log will be rotated automatically when the size crosses the limit.
• Added Last_error, Last_errno, and Slave_skip_counter variables to SHOW SLAVE STATUS.
• Fixed bug in MASTER_POS_WAIT() function.
• Execute core dump handler on SIGILL, and SIGBUS in addition to SIGSEGV.
• On x86 Linux, print the current query and thread (connection) id, if available, in the core dump handler.
• Fixed several timing bugs in the test suite.
• Extended 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.
• Fixed creation of MERGE tables on Windows.
• Portability fixes for OpenBSD and OS/2.
• Added --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 behaviour, Linux seems to "leak" memory, as it's being allocated to the directory entry cache instead of the disk cache.

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