Poor MySQL Query Performance on Large Partitioned Tables with A Lot of Partitions (>50) For MySQL 5.1 and 5.5
Last updated on APRIL 06, 2017
Applies to:MySQL Server - Version 5.1 to 5.5 [Release 5.1 to 5.5]
Information in this document applies to any platform.
This should be much better from MySQL 5.6 onward.
- Execution time of queries increases under load and concurrency.
- CPU is low, I/O wait is high (> 10 %).
- Lot of queries on one or more partitioned tables appear in the show processlist and the slow query log.
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