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Re: Merge algorithms for large numbers of "tapes" - Mailing list pgsql-hackers

From Tom Lane
Subject Re: Merge algorithms for large numbers of "tapes"
Date
Msg-id 8100.1141790589@sss.pgh.pa.us
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In response to Re: Merge algorithms for large numbers of "tapes"  ("Luke Lonergan" <llonergan@greenplum.com>)
Responses Re: Merge algorithms for large numbers of "tapes"  ("Luke Lonergan" <llonergan@greenplum.com>)
Re: Merge algorithms for large numbers of "tapes"  ("Luke Lonergan" <llonergan@greenplum.com>)
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"Luke Lonergan" <llonergan@greenplum.com> writes:
> Two passes is the state-of-the-practice on external disk sorts.

There is no such thing as a fixed number of passes regardless of
available memory and size of the data.
        regards, tom lane

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