使用引擎myisam或innodb获取MySQL中数据库最近24小时内更新的表列表

Question

I have tried a php script like:

$res=mysql_query("SELECT TABLE_NAME 
                  FROM  information_schema.'TABLES' 
                  WHERE  UPDATE_TIME > NOW() - INTERVAL 2 DAY 
                  AND  ABLE_SCHEMA = 'mvgis_lewiscounty'");

which is not working.

Can anyone please guide me how should I proceed with this?

Answer 1

There's no solution using INFORMATION_SCHEMA that works for both InnoDB and MyISAM.

The UPDATE_TIME is not updated for InnoDB tables. Update time for an InnoDB table is kind of subjective. Is it the time someone last did an UPDATE ? Is it the time that update was COMMIT ed? Is it the time the change was flushed to the tablespace?

You'd be better off using a shell command like:

$ find /var/lib/mysql -name '*.ibd' -mtime -1

Another solution would be for all tables to have a trigger that updates a summary table with one row per table name, to record the latest INSERT/UPDATE/DELETE.

See also How can I tell when a MySQL table was last updated?