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Percona Server 5.1.55-12.6

 | March 7, 2011 |  Posted In: MySQL, Percona Software


Percona Server version 5.1.55-12.6 is now available for download. It is now the current stable release version.


  • Fixed compiler warnings in both the core server and in XtraDB. (Alxey Kopytov, Yasufumi Kinoshita)

Bugs Fixed

  • Bug #602047 – The ROWS_READ columns of TABLE_STATISTICS and INDEX_STATISTICS were not properly updated when a query involved index lookups on an InnoDB table. (Yasufumi Kinoshita)
  • Bug #707742 – The server could crash when trying to import a table which had not been previously prepared using xtrabackup --prepare --export. Also, on servers with huge buffer pools, adding or removing an index even on an empty InnoDB table could take a long time due to excessive locking when innodb_dict_size_limit was non-zero. Locking was relaxed to alleviate this. (Yasufumi Kinoshita)
  • Bug #724674 – Ported an updated version of the original implementation of the Excessive Function Calls, which removes some fcntl calls to improve performance.  (Oleg Tsarev)

For more information, please see the following links:

Fred Linhoss

Fred is a former Percona employee. Fred has a long history in software development and has held positions in both programming and technical management. He holds a degree in Computer Science from Virginia Tech.


  • What’s the deal with percona being behind the curve so much lately – 5.5 went GA quite some time ago and you’re still releasing 5.1 versions. Why would I want to upgrade to your “new release” that doesn’t even offer the vastly superior features of 5.5?

  • We’re still releasing 5.1 versions because Oracle is still releasing 5.1 versions. Big enterprises are slow and cautious with upgrades for good reason. 5.5 went GA only a few months ago; many companies won’t consider a 5.5 upgrade for another six months to a year, after a few more point releases come out.

  • @Baron: I understand that requirement as we’re only now testing GA 5.5 on some boxes to see what breaks… but it would seem that by the same logic you use that you would be releasing 5.1 and 5.5.

  • Note that in addition to Percona Server having a 5.5 release, our 5.1 release beats Oracle’s 5.5 in performance, and has many more features. So you could easily argue that moving from Oracle’s 5.5 to Percona’s 5.1 is in fact an upgrade 🙂

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