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Home > Archive > PostgreSQL Documentation > July 2005 > ROW SHARE/SELECT ... FOR UPDATE + foreign keys
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ROW SHARE/SELECT ... FOR UPDATE + foreign keys
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| Thomas F. O'Connell 2005-07-21, 8:24 pm |
| What would people think of adding a note to the ROW SHARE section of
Table-Level Locks remarking on the fact that referential integrity
checks expressed through foreign keys do SELECT ... FOR UPDATES.
http://www.postgresql.org/docs/8.0/static/explicit-
locking.html#LOCKING-TABLES
It was somewhat challenging today to try to track down a pervasive
locking issue related to a table not directly referenced in a stored
procedure but that was referenced by a key in a table that was being
updated.
I'm not sure how this changes with the new shared row locking
implementation in 8.1...
--
Thomas F. O'Connell
Co-Founder, Information Architect
Sitening, LLC
Strategic Open Source: Open Your i™
http://www.sitening.com/
110 30th Avenue North, Suite 6
Nashville, TN 37203-6320
615-260-0005
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| Bruce Momjian 2005-07-22, 3:26 am |
| Thomas F. O'Connell wrote:
> What would people think of adding a note to the ROW SHARE section of
> Table-Level Locks remarking on the fact that referential integrity
> checks expressed through foreign keys do SELECT ... FOR UPDATES.
>
> http://www.postgresql.org/docs/8.0/static/explicit-
> locking.html#LOCKING-TABLES
>
> It was somewhat challenging today to try to track down a pervasive
> locking issue related to a table not directly referenced in a stored
> procedure but that was referenced by a key in a table that was being
> updated.
>
> I'm not sure how this changes with the new shared row locking
> implementation in 8.1...
>
8.1 will use _shared_ row locks for such cases.
--
Bruce Momjian | http://candle.pha.pa.us
pgman@candle.pha.pa.us | (610) 359-1001
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