From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
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To: | Benjamin Smith <lists(at)benjamindsmith(dot)com> |
Cc: | pgsql-general(at)postgresql(dot)org |
Subject: | Re: pgsql 9.0.1 table corruption |
Date: | 2011-04-16 01:27:51 |
Message-ID: | 19489.1302917271@sss.pgh.pa.us |
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Lists: | pgsql-general |
Benjamin Smith <lists(at)benjamindsmith(dot)com> writes:
> On Friday, April 15, 2011 09:50:57 AM Tom Lane wrote:
>> If you simply unpacked the tar archive and started a postmaster on that,
>> you'd be pretty much guaranteed to get a corrupt database. The tar
>> archive is not a valid snapshot by itself --- you have to replay
>> whatever WAL was generated during the archiving sequence in order to get
>> to a consistent database state.
> I have, more than once, "moved" a PG instance from one machine to another with
> the following sequence, without apparent issue. is there anything I'm missing
> and/or need to be concerned with?
> 1) service postgresql stop;
> 2) rsync -vaz /var/lib/pgsql root(at)newserver:/var/lib/pgsql;
> 3) ssh root(at)newserver;
> 4) (edit postgresql.conf, set IP addresses, memory, etc)
> 5) service postgresql start;
That way is fine --- what you can't do is take a tarball while the
server is running, unless you do the full nine yards with WAL replay.
regards, tom lane
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