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Re: Incomplete pg_dump operation

From: peter(at)vfemail(dot)net
To: pgsql-novice(at)postgresql(dot)org
Subject: Re: Incomplete pg_dump operation
Date: 2010-02-07 11:36:02
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Lists: pgsql-novice
Thinking more about corruption of some type inside my database and whether an index has become corrupted, I investigated the REINDEX command described at pp. 288 and 847-849 of the 1335-page PostgreSQL 7.4.2 Documentation manual at <> 

This morning, I executed a:

    REINDEX DATABASE database_name FORCE; 

command, and received a bunch of:

    NOTICE:  table "pg_xxxxx" was reindexed 

messages -- which all look just fine.  

I then executed a:


command -- using the table name pg_dump was complaining about yesterday -- and received this message:

    ERROR:  could not open relation with OID 2196359751

making reference to the same OID pg_dump complained about yesterday.  

How do I identify this offensive data record that's causing so much disruption and, perhaps, delete it?  


At 10:08 AM 2/6/2010, peter(at)vfemail(dot)net wrote:

>A shell script runs pg_dump once each day to backup a Postgresql database and then compress it for storage.  The script and backup process worked flawlessly for years, but now returns these error messages:
>   pg_dump: ERROR:  could not open relation with OID 2196359751
>   pg_dump: SQL command to dump the contents of table "xyz" failed: PQendcopy() failed.
>   pg_dump: Error message from server: ERROR:  could not open relation with OID 2196359751
>   pg_dump: The command was: COPY ({various_field_names}) TO stdout;
>The pg_dump command halts with these error messages after copying or dumping about 50% of the database.  Accordingly, only a fraction of the database is actually being backed up.  
>Is there corruption of some type inside my PostgreSQL database?  Has an index or something similar become corrupted?  


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