如何在不重启MySQL的情况下刷新performance_schema统计信息？

Question

I know stats in performance schema are not persistent over MySQL restarts. I want to flush all stats without restarting MySQL. Is there any way to do it?

Thanks.

Answer 1

TRUNCATE TABLE can be used to reset statistics.

See https://dev.mysql.com/doc/refman/5.7/en/performance-schema-table-characteristics.html

Summary tables can be truncated with TRUNCATE TABLE. Generally, the effect is to reset the summary columns to 0 or NULL, not to remove rows. This enables you to clear collected values and restart aggregation.

Answer 2

Easier then truncating each separate table would be to call the procedure:

CALL sys.ps_truncate_all_tables(FALSE);

MySQL 5.7 Reference Manual