On 8/07/2011 7:33 PM, Dmitry wrote:
> The following bug has been logged online:
>
> Bug reference: 6101
> Logged by: Dmitry
> Email address: y4gr5rzn@gmail.com
> PostgreSQL version: 9.0.4
> Operating system: Debian i686 2.6.32-5-686-bigmem
> Description: ALTER TABLE hangs with AccessExclusiveLock
> Details:
>
> ALTER locks the table AccessExclusiveLock and hangs.
> I can break it with Ctrl-C in psql, but it 100% reproduces in any session.
Are there any other sessions running concurrently? Is a lock on the
table you are trying to ALTER already held by another transaction
according to pg_locks ?
So far there's no evidence that this is anything except locking doing
its job.
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Craig Ringer
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