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optimize table joins for faster counting performance

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Tests shows that changing inner joins to left outer joins on non-null fields will significantly improve the counting performance on PostgreSQL server 9.X.

Only large tables (task, build, and rpminfo) are involved in this commit.
This commit is contained in:
Rayson Zhu 2016-08-16 21:32:04 +08:00 • committed by Mike McLean
parent 61db89cae6
commit 1eccf0574c
1 changed files with 6 additions and 6 deletions
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12
hub/kojihub.py
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@ -3543,7 +3543,7 @@ def list_rpms(buildID=None, buildrootID=None, imageID=None, componentBuildrootID
('rpminfo.metadata_only', 'metadata_only'),
('rpminfo.extra', 'extra'),
]
joins = ['external_repo ON rpminfo.external_repo_id = external_repo.id']
joins = ['LEFT JOIN external_repo ON rpminfo.external_repo_id = external_repo.id']
clauses = []
if buildID != None:
@ -9311,10 +9311,10 @@ class RootExports(object):
('users.id', 'owner_id'), ('users.name', 'owner_name')]
tables = ['build']
joins = ['events ON build.create_event = events.id',
'package ON build.pkg_id = package.id',
'volume ON build.volume_id = volume.id',
'users ON build.owner = users.id']
joins = ['LEFT JOIN events ON build.create_event = events.id',
'LEFT JOIN package ON build.pkg_id = package.id',
'LEFT JOIN volume ON build.volume_id = volume.id',
'LEFT JOIN users ON build.owner = users.id']
clauses = []
if packageID != None:
clauses.append('package.id = %(packageID)i')
@ -10033,7 +10033,7 @@ class RootExports(object):
queryOpts = {}
tables = ['task']
joins = ['users ON task.owner = users.id']
joins = ['LEFT JOIN users ON task.owner = users.id']
flist = Task.fields + (
('task.request', 'request'),
('task.result', 'result'),