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Re: Delete, foreign key, index usage - Mailing list pgsql-performance

From Rick Otten
Subject Re: Delete, foreign key, index usage
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Msg-id CAMAYy4KMt-NxqmhNmLr5gxH_WOJqnmP17BGXCj1G37YMk2jR2Q@mail.gmail.com
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In response to Re: Delete, foreign key, index usage  (Johann Spies <johann.spies@gmail.com>)
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On Wed, Apr 5, 2017 at 6:40 AM, Johann Spies <johann.spies@gmail.com> wrote:
On 4 April 2017 at 14:07, Johann Spies <johann.spies@gmail.com> wrote:

> Why would that be?

To answer my own question.  After experimenting a lot we found that
9.6 uses a parallel seqscan that is actually a lot faster than using
the index on these large tables.

This, to us was a surprise!


If you have modern GPU's available, you could try the pg-strom extension - https://github.com/pg-strom/devel
It leverages GPU's to further parallelize scans.


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