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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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8
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;

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sqitch/revert/increase_derivation_inputs_statistics_targets.sql Normal file
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-- Revert guix-data-service:increase_derivation_inputs_statistics_targets from pg
BEGIN;
-- XXX Add DDLs here.
COMMIT;

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sqitch/sqitch.plan
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@ -76,3 +76,4 @@ git_repositories_add_fetch_with_authentication_field 2020-10-07T17:31:20Z Christ
create_latest_build_status 2020-10-13T17:22:39Z Christopher Baines <mail@cbaines.net> # Create the latest_build_status table
regenerate_latest_build_status 2020-10-21T18:39:03Z Christopher Baines <mail@cbaines.net> # Regenerate the latest_build_status table
guix_revision_package_derivations_add_package_derivation_index 2020-10-27T16:58:08Z Christopher Baines <mail@cbaines.net> # Add index for guix_revision_package_derivations.package_derivation_id
increase_derivation_inputs_statistics_targets 2020-12-27T10:34:58Z Christopher Baines <mail@cbaines.net> # Increase stats targets on derivation_inputs fields

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sqitch/verify/increase_derivation_inputs_statistics_targets.sql Normal file
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-- Verify guix-data-service:increase_derivation_inputs_statistics_targets on pg
BEGIN;
-- XXX Add verifications here.
ROLLBACK;