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Replace the KnownAssignedXids hash table with a sorted-array data structure,
and be more tense about the locking requirements for it, to improve performance in Hot Standby mode. In passing fix a few bugs and improve a number of comments in the existing HS code. Simon Riggs, with some editorialization by Tom
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‎src/backend/access/transam/twophase.c

Lines changed: 4 additions & 1 deletion
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@@ -7,7 +7,7 @@
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* IDENTIFICATION
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* $PostgreSQL: pgsql/src/backend/access/transam/twophase.c,v 1.60 2010/04/13 14:17:46 heikki Exp $
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* $PostgreSQL: pgsql/src/backend/access/transam/twophase.c,v 1.61 2010/04/28 00:09:05 tgl Exp $
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*
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* NOTES
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* Each global transaction is associated with a global transaction
@@ -1200,6 +1200,9 @@ StandbyTransactionIdIsPrepared(TransactionId xid)
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Assert(TransactionIdIsValid(xid));
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if (max_prepared_xacts <= 0)
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return false; /* nothing to do */
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/* Read and validate file */
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buf = ReadTwoPhaseFile(xid, false);
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if (buf == NULL)

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