Hi,

For the last few years I have been using a fairly basic MySQL maintenance script that OPTIMIZE's, ALTER's by the id field and ANAYLYZE's, in that order, every table in my database.

I have been noticing this script is causing some bottlenecks as the loop iterates over large tables and started to research whether and/or how often these queries should be performed on a table.

From what I have read:
- I should only be running OPTIMIZE on tables where the Data_free variable from SHOW TABLE STATUS LIKE '$table' is greater than 0
- I shouldn't bother running ANALYZE on InnoDB tables at all as the accuracy of the cardinality is poor.

My question is - are these findings accurate and are there other considerations I should be taking into account?

This is the basic logic of my current script:

foreach ($tables as $table)
{
mysql_query("OPTIMIZE TABLE $table");
mysql_query("ALTER TABLE $table ORDER BY id");
mysql_query("ANALYZE TABLE $table");
}
?>

Thanks