Dne 16.2.2012 9:53, Marti Raudsepp napsal(a):
2012/2/15 Vojtěch Rylko<vojta.rylko@xxxxxxxxx>:
this query performed so long and blocked table so I had to interrupt it. Is
there any way how to drop large indexes in non-blocking or /faster/ way?
Usually the problem is not with the size of the index -- but some
other running transactions that hold a read lock on the table, and
preventing the DROP INDEX from getting an exclusive lock. If the
exclusive lock is granted, the drop index is usually very fast.
Run 'select * from pg_stat_activity' and see if there are any "<IDLE>
in transaction" connections. It's normal to have these for a second or
few, but longer idle transactions usually indicate an application bug
-- it started a transaction, but "forgot" to rollback or commit. These
are problematic for this exact reason -- locks can't be released until
the transaction finishes.
Regards,
Marti
Thanks! Caused by "IDLE in transaction". My nightmare solved. Droping 7
GB index in 2353 ms.
Regards,
Vojtěch R.
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