Обсуждение: Obscure problem due to high system OID or privileges?

Hello,

we have a strange problem with a server instance:

PostgreSQL 8.2.11 on i486-pc-linux-gnu, compiled by GCC cc (GCC) 4.1.3 20070929 (prerelease) (Ubuntu 4.1.2-16ubuntu2)

It's one of several clones (server/system) where one of our applications cannot work with a specific database restored
froma dump of a database on a 8.2.18 server and created with the server's binaries. Recreating the database with
template0again and doing a new restore didn't help. There are no error messages during backup/restore. 

The same database/app works fine on the other clones.

The same app works fine after we put the database on a different instance. So it seems to be a specific problem with
thisserver instance. Other databases on this instance seem to work fine though. 

During 'start up' the application does a couple of SELECTs on pg_catalog:
.
.
.
SELECT COUNT(*) FROM pg_attribute JOIN pg_type ON pg_attribute.atttypid=pg_type.oid LEFT OUTER JOIN pg_attrdef ON (
pg_attribute.attnum=pg_attrdef.adnum  AND pg_attribute.attrelid=pg_attrdef.adrelid ) WHERE pg_attribute.attrelid =
2147483647AND pg_attribute.attnum >= 0 AND pg_attribute.attisdropped = 'false' 
.
.
.

It seems that the application doesn't find some rows. There are no error messages in the server's log though.

The only two obvious differences we found are:

1. The superuser 'nutzer' used for the session had been given two roles ('nutzerrolle' and 'nutzeradmin') in the
problematicserver instance: 

CREATE ROLE nutzerrolle
  NOSUPERUSER INHERIT NOCREATEDB NOCREATEROLE;

CREATE ROLE nutzeradmin
  SUPERUSER INHERIT CREATEDB CREATEROLE;
UPDATE pg_authid SET rolcatupdate=true WHERE OID=9413195::oid;

CREATE ROLE nutzer LOGIN
  ENCRYPTED PASSWORD 'xxxx'
  SUPERUSER INHERIT CREATEDB CREATEROLE;
UPDATE pg_authid SET rolcatupdate=true WHERE OID=2147483647::oid;

Removing these group memberships didn't help though. Recreating the user didn't help neither.

2. Very high system OIDs - e.g. pg_attribute.attrelid max 3318384368 where another server had max 94363332. The
applicationconnects via psqlODBC (8.4.200).  

Is this maybe a known problem?

Could you tell me, please?

Thank you very much,

Peter
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"Jan-Peter Seifert" <Jan-Peter.Seifert@gmx.de> writes:
> During 'start up' the application does a couple of SELECTs on pg_catalog:

> SELECT COUNT(*) FROM pg_attribute JOIN pg_type ON pg_attribute.atttypid=pg_type.oid LEFT OUTER JOIN pg_attrdef ON (
pg_attribute.attnum=pg_attrdef.adnum  AND pg_attribute.attrelid=pg_attrdef.adrelid ) WHERE pg_attribute.attrelid =
2147483647AND pg_attribute.attnum >= 0 AND pg_attribute.attisdropped = 'false' 

Is the table it's looking for really exactly OID 2147483647 (ie 2^31-1)?
That seems a bit improbable.  I suspect something in your app is choking
on an OID that is in fact larger than that, and it's somehow getting
clamped to INT_MAX.

            regards, tom lane

Hello,

-------- Original-Nachricht --------
> Datum: Mon, 03 Jan 2011 11:05:30 -0500
> Von: Tom Lane <tgl@sss.pgh.pa.us>
> An: "Jan-Peter Seifert" <Jan-Peter.Seifert@gmx.de>
> CC: pgsql-admin@postgresql.org
> Betreff: Re: [ADMIN] Obscure problem due to high system OID or privileges?

> "Jan-Peter Seifert" <Jan-Peter.Seifert@gmx.de> writes:
> > During 'start up' the application does a couple of SELECTs on
> pg_catalog:
>
> > SELECT COUNT(*) FROM pg_attribute JOIN pg_type ON
> pg_attribute.atttypid=pg_type.oid LEFT OUTER JOIN pg_attrdef ON (
> pg_attribute.attnum=pg_attrdef.adnum   AND pg_attribute.attrelid=pg_attrdef.adrelid ) WHERE
> pg_attribute.attrelid = 2147483647 AND pg_attribute.attnum >= 0 AND
> pg_attribute.attisdropped = 'false'
>
> Is the table it's looking for really exactly OID 2147483647 (ie 2^31-1)?
> That seems a bit improbable.  I suspect something in your app is choking
> on an OID that is in fact larger than that, and it's somehow getting
> clamped to INT_MAX.

Err - that's really very suspicious as it's a 32-Bit application. We'll test it again with a clone of the server
instanceas I'm not sure whether it was a log from a try on the current database restore. Could take some time though. 

Thank you very much!

Peter
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