canceling autovacuum task error

[tamanna madaan <tamanna.madaan@xxxxxxxxxxxxxxx>]

Hi All

 

I am using a cluster setup having postgres-8.4.0 and slon 2.0.4 is being used for replication . It happened that the autovacuum was not running successfully on one of the nodes in cluster and was giving error :

 

2011-05-13 23:07:42 CDTERROR:  canceling autovacuum task
2011-05-13 23:07:42 CDTCONTEXT:  automatic vacuum of table "abc.abc.sometablename"
2011-05-13 23:07:42 CDTERROR:  could not open relation with OID 141231 at character 87

 

sometimes it was giving a different error as below :

 

2011-05-13 04:45:05 CDTERROR:  canceling autovacuum task
2011-05-13 04:45:05 CDTCONTEXT:  automatic analyze of table "abc.abc.sometablename"
2011-05-13 04:45:05 CDTLOG:  could not receive data from client: Connection reset by peer
2011-05-13 04:45:05 CDTLOG:  unexpected EOF on client connection
2011-05-13 04:45:05 CDTERROR:  duplicate key value violates unique constraint "sl_nodelock-pkey"
2011-05-13 04:45:05 CDTSTATEMENT:  select "_schemaname".cleanupNodelock(); insert into "_mswcluster".sl_nodelock values (    2, 0, "pg_catalog".pg_backend_pid());

 

Can see the below log also in postgres logs :

 

"checkpoints are occurring too frequently (19 seconds apart)"

 I am not sure when these all errors started coming . Just noticed these when database size grew huge and it became slow.

 

Can anybody shed some light on it if these errors are related or what could be the reason for these errors .

 

Thanks..

Tamanna