forked from lix-project/hydra
Create a pg_trgm index on builds.drvpath
The search query uses the LIKE operator which requires a sequential scan (it can't use the already existing B-tree index). This new index (trigram) avoids a sequential scan of the builds table when the LIKE operator is used. Here is the analyze of a request on the builds table with this index: explain analyze select * from builds where drvpath like '%k3r71gz0gv16ld8rhcp2bb8gb5w1xc4b%'; QUERY PLAN ----------------------------------------------------------------------------------------------------------------------------------- Bitmap Heap Scan on builds (cost=128.00..132.01 rows=1 width=492) (actual time=0.070..0.077 rows=1 loops=1) Recheck Cond: (drvpath ~~ '%k3r71gz0gv16ld8rhcp2bb8gb5w1xc4b%'::text) -> Bitmap Index Scan on indextrgmbuildsondrvpath (cost=0.00..128.00 rows=1 width=0) (actual time=0.047..0.047 rows=3 loops=1) Index Cond: (drvpath ~~ '%k3r71gz0gv16ld8rhcp2bb8gb5w1xc4b%'::text) Total runtime: 0.206 ms (5 rows)
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@ -688,3 +688,9 @@ create index IndexBuildsOnKeep on Builds(keep) where keep = 1;
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create index IndexJobsetEvalsOnJobsetId on JobsetEvals(project, jobset, id desc) where hasNewBuilds = 1;
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create index IndexJobsetEvalsOnJobsetId on JobsetEvals(project, jobset, id desc) where hasNewBuilds = 1;
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create index IndexBuildsOnNotificationPendingSince on Builds(notificationPendingSince) where notificationPendingSince is not null;
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create index IndexBuildsOnNotificationPendingSince on Builds(notificationPendingSince) where notificationPendingSince is not null;
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#ifdef POSTGRESQL
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-- Provide an index used by LIKE operator on builds.drvpath (search query)
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CREATE EXTENSION pg_trgm;
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CREATE INDEX IndexTrgmBuildsOnDrvpath ON builds USING gin (drvpath gin_trgm_ops);
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#endif
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2
src/sql/upgrade-57.sql
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2
src/sql/upgrade-57.sql
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@ -0,0 +1,2 @@
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CREATE EXTENSION pg_trgm;
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CREATE INDEX IndexTrgmBuildsOnDrvpath ON builds USING gin (drvpath gin_trgm_ops);
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