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Increase statistics targets for the derivation_inputs table

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It has a lot of rows, and this seems to help the query planning for
select-required-builds-that-failed, as I think it helps PostgreSQL better
estimate the row counts that different parts of the query will produce.
This commit is contained in:
Christopher Baines 2020-12-27 10:37:06 +00:00
parent 150d9c4390
commit 6e390c9b9d
4 changed files with 23 additions and 0 deletions
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sqitch/deploy/increase_derivation_inputs_statistics_targets.sql Normal file
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-- Deploy guix-data-service:increase_derivation_inputs_statistics_targets to pg
BEGIN;
ALTER TABLE derivation_inputs ALTER COLUMN derivation_id SET STATISTICS 10000;
ALTER TABLE derivation_inputs ALTER COLUMN derivation_output_id SET STATISTICS 10000;
COMMIT;