Re: Manual trigger removal [WAS] Flushing Postgres Function Cache - Mailing list pgsql-admin

Resolved, however feedback regarding better ways of doing this would be
appreciated.

The final step was the decrement the reltriggers counter for the parent
table's pg_class entry to 0.  This appears to have resolved the problem.

I'm curious as to whether the problem may have resulted from slony
corruptting internal pg_<tables> or postgres not correctly respecting the
integrity of drop-trigger type transactions and their respective
dependencies.



On Thu, 17 May 2007, Raf wrote:

> Please read from bottom up.  I've proceeded further with this investigation
> and have removed slony.  In spite of this the trigger in pg_trigger and
> pg_dep remained.  I then removed both related records in pg_depend and
> pg_trigger.
>
> If I look in pg_class, it shows that there are 4 triggers on the table which
> previously owened the trigger.  I no longer have any reference to this oid in
> pg_depend or pg_trigger.
>
> Yet, after restarting postgres and all client connections, I now get the
> error:
>
> ERROR: 1 trigger record(s) not found for relation "<mytablename>"
>
> As mentioned, I've checked the for relating oid's in pg_depend and
> pg_trigger.  Nadda.
>
> If anyone else has manually done something similar before, I would be
> grateful for some guidence.
>
> Many Thanks.
>
> Raf
>
>
>
>
> On Thu, 17 May 2007, Raf wrote:
>
>> Update on the status of my findings relating to the bug below:
>>
>> I did:
>>
>> rafiq@rafiq ~/scratch/ $ echo "select tablename from pg_tables where
>> tablename like 'pg_%'" | psql -U <user> <db> > pg_tables.txt
>> rafiq@rafiq ~/scratch/ $ for i in `cat pg_tables.txt`; do echo "==$i==";
>> echo "select * from $i"| psql -U <user> <db> | grep 54881296; # the-oid;
>> done;
>>
>> And got:
>>
>> ...
>> ==pg_trigger==
>>   273090 | _ipt_replication_logtrigger_114 | 54881296 |     29 | t | f | |
>> 0 | f            | f              |       3 |        |
>> _ipt_replication\000114\000vvvvvvkkkkvvv\000
>> ...
>> ==pg_depend==
>>   16412 | 54881725 |        0 |       1255 | 54881296 |           0 | n
>> ...
>>
>>
>> Which to me looks very slonny related.  It seems like the OID related to a
>> slonny trigger.
>>
>> Has anyone seen this before, with regard to slonny?  I'm thinking of
>> removing and readding slonny associations.  Is this best way forward?
>>
>> Cheers,
>>
>> Raf
>>
>>
>> On Thu, 17 May 2007, Raf wrote:
>>
>>> Greetings,
>>>
>>> In the face of shabby google results, I hoped that someone hear might know
>>> something about the postgres function cache.  We have a server which
>>> reports an error of the form "cache lookup failed for function <oid>."
>>>
>>> Initially, I'd hoped to resolve this without a restart (which didn't do
>>> the trick either), and had been searching for some way to clear postgres'
>>> internal function cache - I think it stores plans/hints/compiled-version
>>> relating to stored proc's?
>>>
>>> I tried to select the reported oid out of pg_proc, which resulted in an
>>> empty set.
>>>
>>> I then went on to explicitly drop the function and recreate it.  This was
>>> interspersed with numerous postgres restarts and dropping of all client
>>> connections.  In spite of this I still get the same error from our client
>>> which still reports the same OID; which doesn't exist in pg_proc.
>>>
>>> In any case, I can't seem to find any documentation which tells me how to
>>> clear this cache.
>>>
>>> Versions:
>>>
>>> pg: postgresql v 8.0.1-r4
>>> os: Gentoo Linux/Kernel 2.6.12.5 #1
>>>
>>> Any help would be of value?
>>>
>>> Cheers,
>>>
>>> Raf
>>>
>>>
>>>
>>>
>>
>> ---------------------------(end of broadcast)---------------------------
>> TIP 9: In versions below 8.0, the planner will ignore your desire to
>>      choose an index scan if your joining column's datatypes do not
>>      match
>>
>