Truncating big MySQL (InnoDB) tables
Truncating big tables, with millions of rows, in InnoDB can be really slow. Luckily there is a small trick to speed this up.
The trick is to first create a table that has the same structure as the table you are truncating:
CREATE TABLE `new_table` LIKE `bigtable`;
Then you can swap the to be truncated table for the empty table:
RENAME TABLE `bigtable` TO `old_table`, `new_table` TO `bigtable`;
After this your system will use the new (and empty) table, and you can do a quick drop of the old big table:
DROP TABLE `old_table`;
Done, you have succesfully truncated your huge table.
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