deadlock problem

Christopher Kings-Lynne wrote:

I'm always getting deadlocks like this:

[30-Mar-2003 19:19:51] PHP Fatal error: postgres7 error: [0: ERROR:
deadlock detected
] in EXECUTE("INSERT INTO users_foods (user_id, date, meal_id, quantity,
eaten, food_id) VALUES ('55283', '2003-04-07', '1', '1.00', 'f', '779')")
in /usr/local/www/generic/lib/adodb/adodb-errorhandler.inc.php on line 71

Why would an INSERT cause a deadlock problem? Is this due to the FOR UPDATE
problem with foreign keys?

Is this in a transaction with other queries? Are there foreign keys to
other tables that may be causing it. I don't remember if INSERT locks
foreign tables, but it might.

-- 
  Bruce Momjian                        |  http://candle.pha.pa.us
  pgman@candle.pha.pa.us               |  (610) 359-1001
  +  If your life is a hard drive,     |  13 Roberts Road
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On Mon, 31 Mar 2003, Christopher Kings-Lynne wrote:

I'm always getting deadlocks like this:

[30-Mar-2003 19:19:51] PHP Fatal error: postgres7 error: [0: ERROR:
deadlock detected
] in EXECUTE("INSERT INTO users_foods (user_id, date, meal_id, quantity,
eaten, food_id) VALUES ('55283', '2003-04-07', '1', '1.00', 'f', '779')")
in /usr/local/www/generic/lib/adodb/adodb-errorhandler.inc.php on line 71

Why would an INSERT cause a deadlock problem? Is this due to the FOR UPDATE
problem with foreign keys?

Probably if this table is on either side of one.

Christopher Kings-Lynne wrote:

I'm always getting deadlocks like this:

[30-Mar-2003 19:19:51] PHP Fatal error: postgres7 error: [0: ERROR:
deadlock detected
] in EXECUTE("INSERT INTO users_foods (user_id, date, meal_id, quantity,
eaten, food_id) VALUES ('55283', '2003-04-07', '1', '1.00', 'f', '779')")
in /usr/local/www/generic/lib/adodb/adodb-errorhandler.inc.php on line 71

Why would an INSERT cause a deadlock problem? Is this due to the FOR UPDATE
problem with foreign keys?

I don't suppose a VACUUM is happening at the same time? I've found
that 7.2.4 likes to give deadlocks during inserts into a table when
it's being VACUUMed (haven't tried it on 7.3.2 yet).

--
Kevin Brown kevin@sysexperts.com