MySQL 5.5.36 Overview and Highlights

MySQL 5.5.36 was recently released (it is the latest MySQL 5.5, is GA), and is available for download here:

http://dev.mysql.com/downloads/mysql/5.5.html

I was reading through the changelogs to review the changes and fixes, and to summarize, I must say this release is mostly uneventful.

There was one new feature added (for building, so not really applicable to everyone), and only 17 bugs fixed.

The new feature is this:

  • CMake now supports a -DTMPDIR=dir_name option to specify the default tmpdir value. If unspecified, the value defaults to P_tmpdir in . Thanks to Honza Horak for the patch. (Bug #68338, Bug #16316074)

Out of the 17 bugs, there was only 1 I thought worth mentioning (because it is a wrong results bug):

  • COUNT(DISTINCT) sometimes produced an incorrect result when the last read row contained a NULL value. (Bug #68749, Bug #16539979, Bug #71028, Bug #17867117)

Therefore, if you run COUNT(DISTINCT) and you allow NULL values, then you should consider upgrading so you’re not affected by this.

For reference, the full 5.5.36 changelog can be viewed here:

http://dev.mysql.com/doc/relnotes/mysql/5.5/en/news-5-5-36.html

Hope this helps.

 

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