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Tweak indexscan machinery to avoid taking an AccessShareLock on an index

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if we already have a stronger lock due to the index's table being the
update target table of the query.  Same optimization I applied earlier
at the table level.  There doesn't seem to be much interest in the more
radical idea of not locking indexes at all, so do what we can ...
This commit is contained in:
Tom Lane
2005-12-03 05:51:03 +00:00
parent 1cf65140d0
commit a98871b7ac
12 changed files with 95 additions and 35 deletions
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4
src/include/executor/executor.h
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@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/executor/executor.h,v 1.122 2005/12/02 20:03:42 tgl Exp $
* $PostgreSQL: pgsql/src/include/executor/executor.h,v 1.123 2005/12/03 05:51:03 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -230,6 +230,8 @@ extern void ExecAssignScanType(ScanState *scanstate,
TupleDesc tupDesc, bool shouldFree);
extern void ExecAssignScanTypeFromOuterPlan(ScanState *scanstate);
extern bool ExecRelationIsTargetRelation(EState *estate, Index scanrelid);
extern Relation ExecOpenScanRelation(EState *estate, Index scanrelid);
extern void ExecCloseScanRelation(Relation scanrel);