Important thing should do when we delete large number of records from a MySQL table

When you deleting large number of records from a MySQL table, remember to execute following command after deleting the records.

OPTIMIZE TABLE tablename;

By executing this command we can improve performance of the table queries and save storage space.

You can find detail explanation from : http://dev.mysql.com/doc/refman/5.1/en/optimize-table.html

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