| From: | Alvaro Herrera <alvherre(at)commandprompt(dot)com> |
|---|---|
| To: | Michael P(dot) Soulier <michael_soulier(at)mitel(dot)com> |
| Cc: | pgsql-general <pgsql-general(at)postgresql(dot)org> |
| Subject: | Re: Misunderstanding transactions and locks |
| Date: | 2010-06-16 20:01:04 |
| Message-ID: | 1276718397-sup-9623@alvh.no-ip.org |
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| Thread: | |
| Lists: | pgsql-general |
Excerpts from Michael P. Soulier's message of mié jun 16 12:21:16 -0400 2010:
> Hi,
>
> I'm using Django with Postgres 8.3.9 on CentOS Linux.
>
> I'm trying to figure out why locking isn't working as I'm expecting. I have a
> an operation wrapped in a transaction where I explicitely grab an exclusive
> lock on my table. When another process concurrently runs to do the same, it
> should block on attempting to acquire the exclusive lock, no?
> 2010-06-16 12:14:31.913008500 LOG: statement: LOCK TABLE instances IN ROW
> EXCLUSIVE MODE
"row exclusive mode" does not block itself.
--
Álvaro Herrera <alvherre(at)commandprompt(dot)com>
The PostgreSQL Company - Command Prompt, Inc.
PostgreSQL Replication, Consulting, Custom Development, 24x7 support
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