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Fix TransactionIdIsCurrentTransactionId() to use binary search instead of

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linear search when checking child-transaction XIDs.  This makes for an
important speedup in transactions that have large numbers of children,
as in a recent example from Craig Ringer.  We can also get rid of an
ugly kluge that represented lists of TransactionIds as lists of OIDs.

Heikki Linnakangas
This commit is contained in:
Tom Lane
2008-03-17 02:18:55 +00:00
parent a7c58abeb1
commit 32846f8152
3 changed files with 128 additions and 72 deletions
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3
src/backend/access/transam/twophase.c
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@@ -7,7 +7,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/access/transam/twophase.c,v 1.39 2008/01/01 19:45:48 momjian Exp $
* $PostgreSQL: pgsql/src/backend/access/transam/twophase.c,v 1.40 2008/03/17 02:18:55 tgl Exp $
*
* NOTES
* Each global transaction is associated with a global transaction
@@ -827,7 +827,6 @@ StartPrepare(GlobalTransaction gxact)
save_state_data(children, hdr.nsubxacts * sizeof(TransactionId));
/* While we have the child-xact data, stuff it in the gxact too */
GXactLoadSubxactData(gxact, hdr.nsubxacts, children);
pfree(children);
}
if (hdr.ncommitrels > 0)
{