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Commit037709e

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Reduce default value of max_prepared_transactions from 50 to 5. This
saves nearly 700kB in the default shared memory segment size, which seemsworthwhile, and it is a feature that many users won't use anyway. PerHeikki's argument, there is no point in a compromise value --- those whoare using 2PC at all will probably want it at least equal to max_connections.But we can't set it to zero by default without breaking the prepared_xactsregression test.
1 parent8aec77f commit037709e

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4 files changed

+7
-7
lines changed

4 files changed

+7
-7
lines changed

‎doc/src/sgml/runtime.sgml‎

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@@ -1,5 +1,5 @@
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<!--
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$PostgreSQL: pgsql/doc/src/sgml/runtime.sgml,v 1.348 2005/08/24 18:56:07 tgl Exp $
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$PostgreSQL: pgsql/doc/src/sgml/runtime.sgml,v 1.349 2005/08/29 21:38:17 tgl Exp $
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-->
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<chapter Id="runtime">
@@ -1179,7 +1179,7 @@ SET ENABLE_SEQSCAN TO OFF;
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endterm="sql-prepare-transaction-title">).
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Setting this parameter to zero disables the prepared-transaction
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feature.
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The default is50.
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The default is5.
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This option can only be set at server start.
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</para>
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‎src/backend/access/transam/twophase.c‎

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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 1.10 2005/08/20 23:26:10 tgl Exp $
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*$PostgreSQL: pgsql/src/backend/access/transam/twophase.c,v 1.11 2005/08/29 21:38:18 tgl Exp $
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*
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* NOTES
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*Each global transaction is associated with a global transaction
@@ -64,7 +64,7 @@
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#defineTWOPHASE_DIR "pg_twophase"
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/* GUC variable, can't be changed after startup */
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intmax_prepared_xacts=50;
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intmax_prepared_xacts=5;
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/*
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* This struct describes one global transaction that is in prepared state

‎src/backend/utils/misc/guc.c‎

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@@ -10,7 +10,7 @@
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* Written by Peter Eisentraut <peter_e@gmx.net>.
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*
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* IDENTIFICATION
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* $PostgreSQL: pgsql/src/backend/utils/misc/guc.c,v 1.286 2005/08/22 17:34:59 momjian Exp $
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* $PostgreSQL: pgsql/src/backend/utils/misc/guc.c,v 1.287 2005/08/29 21:38:18 tgl Exp $
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*
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*--------------------------------------------------------------------
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*/
@@ -1203,7 +1203,7 @@ static struct config_int ConfigureNamesInt[] =
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NULL
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},
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&max_prepared_xacts,
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50,0,INT_MAX,NULL,NULL
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5,0,INT_MAX,NULL,NULL
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},
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#ifdefLOCK_DEBUG

‎src/backend/utils/misc/postgresql.conf.sample‎

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@@ -90,7 +90,7 @@
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#shared_buffers = 1000# min 16 or max_connections*2, 8KB each
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#temp_buffers = 1000# min 100, 8KB each
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#max_prepared_transactions =50# can be 0 or more
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#max_prepared_transactions =5# can be 0 or more
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#work_mem = 1024# min 64, size in KB
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#maintenance_work_mem = 16384# min 1024, size in KB
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#max_stack_depth = 2048# min 100, size in KB

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