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Re: ROW SHARE/SELECT ... FOR UPDATE + foreign keys

From: Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>
To: "Thomas F(dot) O'Connell" <tfo(at)sitening(dot)com>
Cc: pgsql-docs(at)postgresql(dot)org
Subject: Re: ROW SHARE/SELECT ... FOR UPDATE + foreign keys
Date: 2005-07-22 05:13:22
Message-ID: 200507220513.j6M5DM209271@candle.pha.pa.us (view raw or flat)
Thread:
Lists: pgsql-docs
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(at)candle(dot)pha(dot)pa(dot)us               |  (610) 359-1001
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