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Re: [OT] Flushing Postgres Function Cache

From: Raf <rafiq(at)joshua(dot)dreamthought(dot)com>
To: pgsql-admin(at)postgresql(dot)org
Subject: Re: [OT] Flushing Postgres Function Cache
Date: 2007-05-17 11:27:34
Message-ID: 20070517122322.V69332@joshua.dreamthought.com (view raw or flat)
Thread:
Lists: pgsql-admin
Update on the status of my findings relating to the bug below:

I did:

rafiq(at)rafiq ~/scratch/ $ echo "select tablename from pg_tables where 
tablename like 'pg_%'" | psql -U <user> <db> > pg_tables.txt
rafiq(at)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
>
>
>
>

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