Query to find tables modified in the last hour

Question

I want to find out which tables have been modified in the last hour in a MySQL database. How can I do this?

Answer 1

MySQL 5.x can do this via the INFORMATION_SCHEMA database. This database contains information about tables, views, columns, etc.

SELECT *  FROM `INFORMATION_SCHEMA`.`TABLES` WHERE      DATE_SUB(NOW(), INTERVAL 1 HOUR) < `UPDATE_TIME` 

Returns all tables that have been updated (UPDATE_TIME) in the last hour. You can also filter by database name (TABLE_SCHEMA column).

An example query:

SELECT      CONCAT(`TABLE_SCHEMA`, '.', `TABLE_NAME`) AS `Table`,      UPDATE_TIME AS `Updated` FROM `INFORMATION_SCHEMA`.`TABLES` WHERE     DATE_SUB(NOW(), INTERVAL 3 DAY) < `UPDATE_TIME`     AND `TABLE_SCHEMA` != 'INFORMATION_SCHEMA'     AND `TABLE_TYPE` = 'BASE TABLE';