Analyze a MySQL table before swapping it in place.
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pt-online-schema-change-analyze.pl Analyze before the table swap Jun 14, 2014

README.md

pt-online-schema-change-analyze

Analyze a MySQL table before swapping it in place at the end of a migration.

In certain cases it is recommended not to allow MySQL to recalculate table statistics automatically as it can cause a drift in query plans. More info here and here.

This can cause a problems when using pt-online-schema-change as the statistics might not be correct on the new table. This plugin analyzes the table right before the swap is done which allows MySQL to recalculate the statistics and avoids slow queries.

To use the plugin just add:

--plugin /path/to/plugin/pt-online-schema-change-analyze.pl

to your pt-online-schema-change command.