Re: Incomplete pg_dump operation - Mailing list pgsql-novice

Just for the heck of it, I entered the database again and issued the:

     select * from pg_index where indexrelid = 2196359751;

a fourth time.  This time, the command returns this message:

 indexrelid | indrelid | indkey | indclass | indnatts | indisunique | indisprimary | indisclustered | indexprs |
indpred

------------+----------+--------+----------+----------+-------------+--------------+----------------+----------+---------
(0 rows)

------

At 02:07 AM 2/8/2010, [email protected] wrote:

>The first execution of the:
>
>     select * from pg_index where indexrelid = 2196359751;
>
>command returned this message:
>
>     WARNING:  terminating connection because of crash of another server process
>     DETAIL:  The postmaster has commanded this server process to roll back the current transaction and exit, because
anotherserver process exited abnormally and possibly corrupted shared memory. 
>     HINT:  In a moment you should be able to reconnect to the database and repeat your command.
>server closed the connection unexpectedly
>             This probably means the server terminated abnormally
>             before or while processing the request.
>     The connection to the server was lost. Attempting reset: Succeeded.
>
>A second execution of this command returns a syntax error complaining about the semicolon.
>
>A third execution of this command without the semicolon returns nothing.
>
>After executing these three commands, I exited Postgresql and ran the pg_dump script.  The database backup process
terminatedwith these 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 public.xyz ({various field names}) TO stdout;
>
>-------
>
>At 01:19 AM 2/8/2010, Tom Lane wrote:
>>[email protected] writes:
>>> At 11:29 AM 2/7/2010, Tom Lane wrote:
>>>> Do you get anything from "select * from pg_class where oid = 2196359751;" ?
>>
>>> Yes.  The:
>>>      select * from pg_class where oid = 2196359751;
>>> command returns [ nothing ]
>>
>>OK, well that explains why it can't open such a relation ;-).  The next
>>question is why is it trying to.  My first guess is that there is a
>>dangling link in pg_index, ie you once had an index with such an OID
>>but something happened to it.  Please try
>>
>>        select * from pg_index where indexrelid = 2196359751;
>>
>>and if that gets a hit, then select the pg_class row with the OID
>>shown as indrelid.
>>
>>                        regards, tom lane
>
>
>
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