Bug #96904 'Purge Configuration' of MySQL 5.5 is wrong.
Submitted: 17 Sep 12:07 Modified: 18 Sep 22:28
Reporter: Meiji Kimura Email Updates:
Status: Closed Impact on me:
None 
Category:MySQL Server: Documentation Severity:S3 (Non-critical)
Version:5.5 OS:Any
Assigned to: CPU Architecture:Any

[17 Sep 12:07] Meiji Kimura
Description:
Purge configuration is explained in this page.

https://dev.mysql.com/doc/refman/5.5/en/innodb-purge-configuration.html

But it's wrong about innodb_purge_threads.

"By default, purge operations are performed by the InnoDB master thread. Starting with MySQL 5.5, purge operations can performed by one or more separate purge threads rather than as part of the InnoDB master thread."

is wrong. it's for 5.6. In MySQL 5.5, with master thread, or only one separate purge threads. 

"The maximum number of purge threads is 32." is wrong. it's for 5.6.
In MySQL 5.5, 0 or 1, thus maximum number is 1.

https://dev.mysql.com/doc/refman/5.5/en/innodb-parameters.html#sysvar_innodb_purge_threads

Almost of all description is based on MySQL 5.6. Please check and modify based on MySQL 5.5. 

How to repeat:
See above URLs.

Suggested fix:
Please re-write this page.

https://dev.mysql.com/doc/refman/5.5/en/innodb-purge-configuration.html

Based on MySQL 5.5.
[17 Sep 12:14] Umesh Shastry
Hello Meiji-San,

Thank you for the report and feedback.

regards,
Umesh
[18 Sep 22:28] Daniel Price
Posted by developer:
 
The 5.5 purge content has been revised. Changes should appear online soon. 
Thank you for the bug report.