On 04/05/2017 12:04 PM, Bruno Wolff III wrote:
On Wed, Apr 05, 2017 at 00:05:31 -0400,
Tom Lane <tgl@xxxxxxxxxxxxx> wrote:
Bruno Wolff III <bruno@xxxxxxxx> writes:
... I create both a normal gist index and an exclude index using the
following:
CREATE INDEX contains ON iplocation USING gist (network inet_ops);
ALTER TABLE iplocation
ADD CONSTRAINT overlap EXCLUDE USING gist (network inet_ops WITH &&);
But I am wondering if it is useful to have the normal gist index for
finding netblocks containing a specific IP address, as it seems like
the
exclude index should be usable for that as well.
No, that manually-created index is completely redundant with the
constraint index.
Thanks.
P.S. Using spgist with version 10 for the exclude index is much faster
than using gist in 9.6. I have run the index creation for as long as 6
hours and it hasn't completed with 9.6. It took less than 10 minutes
to create it in 10. For this project using 10 isn't a problem and I'll
be doing that.
That's an incredible difference. Is it believable? Same resource, etc?
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