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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
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@ -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;