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Percona Server 5.5.25-27.0 release delayed

 | June 28, 2012 |  Posted In: Percona Software


Due to a bug in upstream MySQL ( ), we’ve decided to delay the release of the next Percona Server release until it is resolved. We had originally expected to release Percona Server 5.5.25-27.0 today and instead I’m informing you that we are not.

Quoting Hartmut, who reported the bug:

An UPDATE that should only modify a single row runs forever and blows up table / tablespace size until there is no more disk space available.

This isn’t something we want to expose our users to.

Oracle now lists the latest MySQL 5.5 version on their download site ( ) as 5.5.24, which is the previous release.

We will keep our 5.5.25 binaries available in our EXPERIMENTAL repository and download site, but will delay our final 5.5.25 release until a resolution to this bug is available.

Stewart Smith

Stewart Smith has a deep background in database internals including MySQL, MySQL Cluster, Drizzle, InnoDB and HailDB. he is also one of the founding core developers of the Drizzle database server. He served at Percona from 2011-2014. He is a former Percona employee.


  • For those who have upgraded to 5.5.25 before it was recalled, the upstream bug report has a workaround reported by Davi Arnaut:

    SET GLOBAL optimizer_switch = ‘index_merge=off’;

  • It seem 5.5.24 is unsafe as well, today our production server crashed due to the bug in (forcing us to remove the partition off the table)

    I wonder do any developer in Percona team able to see the duplicate ticket mentioned in the first link? it seem that ticket is private and got access denied.

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