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Add GUC full_page_writes to control writing full pages to WAL.

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This commit is contained in:
Bruce Momjian
2005-07-05 23:18:10 +00:00
parent c19aa704c8
commit 326a7a0788
4 changed files with 55 additions and 5 deletions
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7
src/backend/access/transam/xlog.c
View File

@@ -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/backend/access/transam/xlog.c,v 1.206 2005/07/04 04:51:44 tgl Exp $
* $PostgreSQL: pgsql/src/backend/access/transam/xlog.c,v 1.207 2005/07/05 23:18:09 momjian Exp $
*
*-------------------------------------------------------------------------
*/
@@ -103,6 +103,7 @@ int XLOGbuffers = 8;
char *XLogArchiveCommand = NULL;
char *XLOG_sync_method = NULL;
const char XLOG_sync_method_default[] = DEFAULT_SYNC_METHOD_STR;
bool fullPageWrites = true;
#ifdef WAL_DEBUG
bool XLOG_DEBUG = false;
@@ -594,7 +595,9 @@ begin:;
{
/* OK, put it in this slot */
dtbuf[i] = rdt->buffer;
if (XLogCheckBuffer(rdt, &(dtbuf_lsn[i]), &(dtbuf_xlg[i])))
/* If fsync is off, no need to backup pages. */
if (fullPageWrites &&
XLogCheckBuffer(rdt, &(dtbuf_lsn[i]), &(dtbuf_xlg[i])))
{
dtbuf_bkp[i] = true;
rdt->data = NULL;

15
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 1.272 2005/07/04 04:51:51 tgl Exp $
* $PostgreSQL: pgsql/src/backend/utils/misc/guc.c,v 1.273 2005/07/05 23:18:10 momjian Exp $
*
*--------------------------------------------------------------------
*/
@@ -83,6 +83,7 @@ extern DLLIMPORT bool check_function_bodies;
extern int CommitDelay;
extern int CommitSiblings;
extern char *default_tablespace;
extern bool fullPageWrites;
static const char *assign_log_destination(const char *value,
bool doit, GucSource source);
@@ -482,6 +483,18 @@ static struct config_bool ConfigureNamesBool[] =
&zero_damaged_pages,
false, NULL, NULL
},
{
{"full_page_writes", PGC_SIGHUP, WAL_SETTINGS,
gettext_noop("Writes full pages to WAL when first modified after a checkpoint."),
gettext_noop("A page write in process during an operating system crash might be "
"only partially written to disk. During recovery, the row changes"
"stored in WAL are not enough to recover. This option writes "
"pages when first modified after a checkpoint to WAL so full recovery "
"is possible.")
},
&fullPageWrites,
true, NULL, NULL
},
{
{"silent_mode", PGC_POSTMASTER, LOGGING_WHEN,
gettext_noop("Runs the server silently."),

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

@@ -121,6 +121,7 @@
#wal_sync_method = fsync # the default varies across platforms:
# fsync, fdatasync, fsync_writethrough,
# open_sync, open_datasync
#full_page_writes = on # recover from partial page writes
#wal_buffers = 8 # min 4, 8KB each
#commit_delay = 0 # range 0-100000, in microseconds
#commit_siblings = 5 # range 1-1000