Hi,



I've just inherited a PG DB (7.3.10 on RH 2.4.21 )



Chatting to the person who administered(?) the DB prior to me I
discovered that it had never been vacuumed/analyzed...



When performing a vacuum/analyze on the template1 DB I got the following
at the end:



WARNING: Some databases have not been vacuumed in over 2 billion
transactions.

You may have already suffered transaction-wraparound data loss.



Selecting from pg_database shows the following:



datname | datvacuumxid | datfrozenxid

----------------+--------------+--------------

template1 | 2160549932 | 1086808109

template0 | 427 | 427

live01.db | 427 | 427

stage01.db | 2153231186 | 1079489364



I get the feeling that all is not well with this DB.



Virtually every line in the logfile consists of:



2006-08-30 11:07:57 WARNING: ROLLBACK: no transaction in progress

2006-08-30 11:07:57 WARNING: ROLLBACK: no transaction in progress

2006-08-30 11:07:57 WARNING: ROLLBACK: no transaction in progress

2006-08-30 11:07:57 WARNING: ROLLBACK: no transaction in progress

2006-08-30 11:07:57 WARNING: ROLLBACK: no transaction in progress

2006-08-30 11:07:57 WARNING: ROLLBACK: no transaction in progress





Could someone advise me on how to reset the datvacuumxid on the
template1 DB (I don't think it should be this high), also is the message
about data loss really implying that we may have lost data?



TIA



Nigel





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"Nigel Bishop" <Nigel.Bishop@ioko.com> writes:
> Selecting from pg_database shows the following:

> datname | datvacuumxid | datfrozenxid
> ----------------+--------------+--------------
> template1 | 2160549932 | 1086808109
> template0 | 427 | 427
> live01.db | 427 | 427
> stage01.db | 2153231186 | 1079489364

The numbers for template1 and stage01.db look reasonable (but perhaps
you just recently vacuumed them?). What the message is probably
complaining about is that live01.db has seemingly never been vacuumed.
You can ignore template0, it's not supposed to be touched, but the
others all need vacuuming every so often.

> Could someone advise me on how to reset the datvacuumxid on the
> template1 DB (I don't think it should be this high), also is the message
> about data loss really implying that we may have lost data?

Yes, otherwise we'd not bother to emit it.

regards, tom lane

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