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MySQL 5.6 Reference Manual
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MySQL 5.6 Reference Manual  /  ...  /  Replication and CHECKSUM TABLE Replication and CHECKSUM TABLE

CHECKSUM TABLE returns a checksum that is calculated row by row, using a method that depends on the table row storage format, which is not guaranteed to remain the same between MySQL release series. For example, the storage format for temporal types such as TIME, DATETIME, and TIMESTAMP changed in MySQL 5.6 prior to MySQL 5.6.5, so if a 5.5 table is upgraded to MySQL 5.6, the checksum value may change.

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