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delete from a A where a.ID = 132.
The table A contains around 5000 records and A.ID is the primary key in the table A. But it is taking a long time to delete . Sometimes its getting timed out also . That table contains three indexes and it is referenced by three foreign keys . Can anyone explain me why its taking long time even though we are deleting based on the primary key . And please tell me some way to optimize this problem …?
Obviously it should not be taking a long time. However, there isn’t enough information here to figure out exactly why. I can tell you, though, that you should focus on the Foreign Keys.
These can slow things down if they impose constraints from other, much larger, tables. You may also find out that your timeouts are due to integrity checks that prevent the delete (then the question is why you aren’t getting exceptions instead of a timeout).
My next step would be to remove the foreign keys and then check performance. Then add each one back in at a time and check performance as you go.
Are other operations (e.g. Inserts, Selects, Updates) taking a long time?