Heikki Linnakangas <heikki.linnakan...@enterprisedb.com> writes:
> On 16.12.2010 20:33, Joachim Wieland wrote:
>> How exactly would you "just split the table in chunks of roughly the
>> same size" ?
> Check pg_class.relpages, and divide that evenly across the processes.
> That should be good enough.
Not even close ... relpages could be badly out of date. If you believe
it, you could fail to dump data that's in further-out pages. We'd need
to move pg_relpages() or some equivalent into core to make this
workable.
>> Which queries should pg_dump send to the backend?
> Hmm, I was thinking of "SELECT * FROM table WHERE ctid BETWEEN ? AND ?",
> but we don't support TidScans for ranges. Perhaps we could add that.
Yeah, that seems probably workable, given an up-to-date idea of the
possible block range.
regards, tom lane
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