Slave Performance Too Slow With Row Based Events For Table Without Primary Key
Last updated on DECEMBER 18, 2017
Applies to:MySQL Server - Version 5.5 and later
MySQL Cluster - Version 7.2 and later
Information in this document applies to any platform.
The replication slave SQL thread cannot keep up while processing row based events from the master's binary log. For example:
Several changes may cause this to start happening, for example:
- A new table without a primary key has been added to the system.
- The primary key was removed from an existing table.
- The binlog_format option was changed from STATEMENT to MIXED or ROW or from MIXED to ROW. See also <Note 1507802.1>.
- Upgrading from MySQL 5.6 or earlier to MySQL 5.7 or later while using the deafult value for binlog_format as the default changed from STATEMENT to ROW.
- The workload changed with binlog_format = MIXED. When the format is set to MIXED, MySQL will automatically use the row based format, if the statement is considered potential non-deterministic.
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