Re: WAL bypass for CTAS

Simon Riggs wrote:
> I enclose a complete patch for avoiding WAL usage for CREATE TABLE AS
> SELECT, when not in archive mode (PITR). The main use case for this is
> large BI environments that create summary tables or prejoined tables,
> though there are many general applications.
>
> There is no user interface for this. The speed gain is automatic, when
> archiving is not enabled.

Could we do your NOLOGGING automatically in COPY if we test to see if
anyone else is connected to our current database? I would _love_ to see
pg_dump loads use this automatically, without having to add clauses to
pg_dump output.

I think we decided we can't do it automatically for all zero-row COPYs
because of locking concerns.

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Bruce Momjian | http://candle.pha.pa.us
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