Dropping an index on a MyISAM table should be
instantaneous. It should only take as long as deleting
the idx file from the file system. But it's taking
almost as long as creating the index itself!
Here's my queries and time they took:
/*[10:58:17 AM][367172 ms]*/ alter table MyTable add
index (MyIndex)
/*[11:20:21 AM][183891 ms]*/ alter table MyTable drop
index MyIndex
In MS SQL server, if the index isn't clustered and
there are no other indexes in the table, dropping the
index is instantaneous.
This extreme slowness in dropping a simple index in
MySQL defeats the whole strategy of dropping indexes
on some tables before a huge insert operation.
Why doesn't it just delete the index file and clear
whatever cached buffers it has of it?
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