Percona Server 5.1.49-rel12.0

September 15, 2010

Author

Aleksandr Kuzminsky

MySQL

Percona Software

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Dear Community,

Starting with this release, we introduce a new release model for Percona Server. From now on, we will have both Stable and Release Candidate releases. Release Candidates will introduce new features not yet available in Stable releases.

Along with new features, our new 5.1.49-12.0 RC contains a couple of patches from the Facebook-MySQL tree – https://launchpad.net/mysqlatfacebookÂ . Of particular note is better integration with FlashCache.

We also introduce the very interesting new feature calledÂ “Permanent InnoDB Buffer Pool”Â (sponsored by a Well Known Social Network site). ItÂ allows you to keep the InnoDB buffer pool in memory between restarts of MySQL servers.
This can result in a significant decrease in warmup time after MySQL restarts.

Starting with this release, we will also provide special builds optimized for Cisco UCS B250/C250 servers, which come with a lot of memory (up to 384GB). Mentioned above, “Permanent InnoDB Buffer Pool” is especially interesting for servers with 128GB+ memory sizes, as it currently can take hours to warm up an empty InnoDB buffer pool on these boxes.

Percona Server version 5.1.49-rel12.0 RC is available for download now.

The changes in this release include:

New features

Percona Server 5.1.49-rel12.0 is based on MySQL 5.1.49.

New features added:
- error_pad – Implements error code compatibilities with MySQL 5.5. (Oleg Tsarev)
- query_cache_totally_disable – Allows the user to disable use of the query cache. (Oleg Tsarev, backport from MySQL 5.5)
- show_engines – Changes
  
  SHOW STORAGE ENGINES
  
  1
  
  SHOW STORAGE ENGINES
  
  to report XtraDB when appropriate. (Oleg Tsarev)
- remove_fcntl_excessive_calls Bug #606810 – Removes excessive fcntl calls. (Oleg Tsarev, ported from Facebook tree)
- sql_no_fcache – Prevents blocks of data from being cached to FlashCache during a query. (Oleg Tsarev, ported from FaceBook tree)
- status_wait_query_cache_mutex – Provides a new thread state – â€œWaiting on query cache mutexâ€. (Oleg Tsarev)
- log_connection_error – Issues the warning â€œToo many connectionâ€ if log_warnings is enabled. (Oleg Tsarev)
- response_time_distribution – Counts queries with very short execution times and groups them by time interval. (Oleg Tsarev)
- innodb_buffer_pool_shm_key – Allows storing the buffer pool in a shared memory segment between restarts of the server. (Yasufumi Kinoshita)
- Option syslog was added to the mysql server. If enabled, all commands run on the server are logged to syslog. (Oleg Tsarev)

New variables introduced:
- innodb_flush_log_at_trx_commit_session – Implements a session-level version of the MySQL global system variable
  
  innodb_flush_log_at_trx_commit
  
  1
  
  innodb_flush_log_at_trx_commit
  
  . (Yasufumi Kinoshita)
- innodb_fast_index_creation – Allows disabling of fast index creation. (Yasufumi Kinoshita)
- innodb_use_sys_stats_table – If ON, the table’s statistics are stored statically in the internal table SYS_STATS. The table is populated with the ANALYZE TABLE command. (Yasufumi Kinoshita)

Fixed bugs

Bug #576041 – Fixes long stalls while accessing the innodb_buffer_pool_pages_index table on systems with a large number of tables.

Bug #592007 – More strictly enforces the maximum purge delay defined by innodb_max_purge_lag by removing the requirement that purge operations be delayed if an old consistent read view exists that could see the rows to be purged.

Bug #607449 – Fixes a crash during shutdown when userstat_running=1.

Bug #612954 – Fixes a problem with SHOW PROCESSLIST displaying an incorrect time.

Bug #610525 – Reduces the number of compile time errors when the server is rebuilt.

Bug #569275 – Fixes a crash when XtraDB shuts down in â€œcrash resistent modeâ€.

Bug #589484 – Adds reporting of the query cache mutex status in SHOW PROCESSLIST.

Bug #606965 – Allows preventing data caching to flash storage during a query.

Bug #609027 – Allows query cache use to be completely disabled

Bug #600352 – Fixes SHOW STORAGE ENGINES to correctly report â€œPercona-XtraDBâ€ rather than â€œInnoDBâ€

The binary packages are available on our website.
The Release Notes for this and previous releases can be found in our Wiki.

The latest source code for Percona Server, including the development branch, can be found on LaunchPAD.

Please report any bugs found at Bugs in Percona Server.
For general questions, useÂ our Pecona-discussions group, and for development questions ourÂ Percona-dev group.

For support, commercial, and sponsorship inquiries, contact Percona.