this index:
create index packageupload__distroseries__status__archive__idx on packageupload(id, distroseries, archive) where status in (0,1);
launchpad_qastaging=> explain analyze SELECT PackageUpload.archive, PackageUpload.changesfile, PackageUpload.date_created, PackageUpload.distroseries, PackageUpload.id, PackageUpload.pocket, PackageUpload.signing_key, PackageUpload.status
FROM PackageUpload
WHERE packageupload.distroseries = 104
AND packageupload.archive IN (1, 534)
AND packageupload.status IN (0)
ORDER BY PackageUpload.id DESC LIMIT 31
OFFSET 0; QUERY PLAN
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Limit (cost=0.00..104.34 rows=31 width=36) (actual time=0.155..6.775 rows=1 loops=1)
-> Index Scan Backward using packageupload__distroseries__status__archive__idx on packageupload (cost=0.00..5287.65 rows=1571 width=36) (actual time=0.153..6.772 rows=1 loops=1)
Index Cond: (distroseries = 104)
Filter: ((archive = ANY ('{1,534}'::integer[])) AND (status = 0))
Total runtime: 6.829 ms
(5 rows)
this index: _distroseries_ _status_ _archive_ _idx on packageupload(id, distroseries, archive) where status in (0,1);
create index packageupload_
launchpad_ qastaging= > explain analyze SELECT PackageUpload. archive,
PackageUpload. changesfile,
PackageUpload. date_created,
PackageUpload. distroseries,
PackageUpload. id,
PackageUpload. pocket,
PackageUpload. signing_ key,
PackageUpload. status distroseries = 104 archive IN (1, 534) status IN (0)
QUERY PLAN ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- - _distroseries_ _status_ _archive_ _idx on packageupload (cost=0.00..5287.65 rows=1571 width=36) (actual time=0.153..6.772 rows=1 loops=1) '::integer[ ])) AND (status = 0))
FROM PackageUpload
WHERE packageupload.
AND packageupload.
AND packageupload.
ORDER BY PackageUpload.id DESC LIMIT 31
OFFSET 0;
-------
Limit (cost=0.00..104.34 rows=31 width=36) (actual time=0.155..6.775 rows=1 loops=1)
-> Index Scan Backward using packageupload_
Index Cond: (distroseries = 104)
Filter: ((archive = ANY ('{1,534}
Total runtime: 6.829 ms
(5 rows)