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MySQL 5.7 Reference Manual
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MySQL 5.7 Reference Manual  /  ...  /  Optimizing InnoDB for Systems with Many Tables

9.5.10 Optimizing InnoDB for Systems with Many Tables

  • InnoDB computes index cardinality values for a table the first time that table is accessed after startup, instead of storing such values in the table. This step can take significant time on systems that partition the data into many tables. Since this overhead only applies to the initial table open operation, to warm up a table for later use, access it immediately after startup by issuing a statement such as SELECT 1 FROM tbl_name LIMIT 1.


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