How does mysql check the size of table fragments

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View table fragment size

(1) View the fragment size of a table

Mysql > SHOW TABLE STATUS LIKE 'table name'; 1

The value of the 'Data_free' column in the result is the fragment size.

(2) list all tables that have been fragmented

Mysql > select table_schema db, table_name, data_free, engine from information_schema.tables where table_schema notin ('information_schema',' mysql') and data_free > 0

1 2 3 recommendations

The defragmentation operation will temporarily lock the table. The larger the amount of data, the longer the time. You can make a script that is executed regularly during the access trough. For example, check the DATA_FREE field in the early hours of every Wednesday morning, and clean it up if it is greater than the warning value you think.

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