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Commit3154177

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Skip searching for subxact locks at commit.
At commit all standby locks are releasedfor the top-level transaction, so searchingfor locks for each subtransaction is bothpointless and costly (N^2) in the presenceof many AccessExclusiveLocks.
1 parentf66e7ab commit3154177

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  • src/backend/access/transam

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‎src/backend/access/transam/xact.c

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Original file line numberDiff line numberDiff line change
@@ -4629,9 +4629,11 @@ xact_redo_commit_internal(TransactionId xid, XLogRecPtr lsn,
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/*
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* Release locks, if any. We do this for both two phase and normal one
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* phase transactions. In effect we are ignoring the prepare phase and
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* just going straight to lock release.
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* just going straight to lock release. At commit we release all locks
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* via their top-level xid only, so no need to provide subxact list,
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* which will save time when replaying commits.
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*/
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StandbyReleaseLockTree(xid,nsubxacts,sub_xids);
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StandbyReleaseLockTree(xid,0,NULL);
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}
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/* Make sure files supposed to be dropped are dropped */

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