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Support an optional asynchronous commit mode, in which we don't flush WAL

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before reporting a transaction committed.  Data consistency is still
guaranteed (unlike setting fsync = off), but a crash may lose the effects
of the last few transactions.  Patch by Simon, some editorialization by Tom.
This commit is contained in:
Tom Lane
2007-08-01 22:45:09 +00:00
parent c722628a43
commit 4a78cdeb6b
25 changed files with 998 additions and 303 deletions
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14
src/backend/utils/misc/guc.c
View File

@@ -10,7 +10,7 @@
* Written by Peter Eisentraut <peter_e@gmx.net>.
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/utils/misc/guc.c,v 1.407 2007/07/24 04:54:09 tgl Exp $
* $PostgreSQL: pgsql/src/backend/utils/misc/guc.c,v 1.408 2007/08/01 22:45:09 tgl Exp $
*
*--------------------------------------------------------------------
*/
@@ -553,6 +553,14 @@ static struct config_bool ConfigureNamesBool[] =
&enableFsync,
true, NULL, NULL
},
{
{"synchronous_commit", PGC_USERSET, WAL_SETTINGS,
gettext_noop("Sets immediate fsync at commit."),
NULL
},
&XactSyncCommit,
true, NULL, NULL
},
{
{"zero_damaged_pages", PGC_SUSET, DEVELOPER_OPTIONS,
gettext_noop("Continues processing past damaged page headers."),
@@ -1521,7 +1529,7 @@ static struct config_int ConfigureNamesInt[] =
},
{
{"commit_delay", PGC_USERSET, WAL_CHECKPOINTS,
{"commit_delay", PGC_USERSET, WAL_SETTINGS,
gettext_noop("Sets the delay in microseconds between transaction commit and "
"flushing WAL to disk."),
NULL
@@ -1531,7 +1539,7 @@ static struct config_int ConfigureNamesInt[] =
},
{
{"commit_siblings", PGC_USERSET, WAL_CHECKPOINTS,
{"commit_siblings", PGC_USERSET, WAL_SETTINGS,
gettext_noop("Sets the minimum concurrent open transactions before performing "
"commit_delay."),
NULL

1
src/backend/utils/misc/postgresql.conf.sample
View File

@@ -149,6 +149,7 @@
# - Settings -
#fsync = on # turns forced synchronization on or off
#synchronous_commit = on # immediate fsync at commit
#wal_sync_method = fsync # the default is the first option
# supported by the operating system:
# open_datasync