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by calpaterson
2213 days ago
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Dropping a column in postgres is also instant, so yes, it uses the same trick. Deleting a row is similar too - the row is not removed from the heap page and the database does not get smaller (though if that page gets rewritten the row is not kept). Last time I used innodb it didn't actually return free heap pages to the filesystem at all so no matter how much you deleted the database file never got smaller. EDIT: Looks like that's still the case now: https://bugs.mysql.com/bug.php?id=1341 |
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