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Implement archive_timeout feature to force xlog file switches to occur no more

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than N seconds apart.  This allows a simple, if not very high performance,
means of guaranteeing that a PITR archive is no more than N seconds behind
real time.  Also make pg_current_xlog_location return the WAL Write pointer,
add pg_current_xlog_insert_location to return the Insert pointer, and fix
pg_xlogfile_name_offset to return its results as a two-element record instead
of a smashed-together string, as per recent discussion.

Simon Riggs
This commit is contained in:
Tom Lane
2006-08-17 23:04:10 +00:00
parent bb764e94ce
commit e8ea9e9587
11 changed files with 279 additions and 74 deletions
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11
src/include/access/xlog_internal.h
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@@ -11,11 +11,13 @@
* Portions Copyright (c) 1996-2006, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/access/xlog_internal.h,v 1.15 2006/08/07 16:57:57 tgl Exp $
* $PostgreSQL: pgsql/src/include/access/xlog_internal.h,v 1.16 2006/08/17 23:04:08 tgl Exp $
*/
#ifndef XLOG_INTERNAL_H
#define XLOG_INTERNAL_H
#include <time.h>
#include "access/xlog.h"
#include "fmgr.h"
#include "storage/block.h"
@@ -237,6 +239,12 @@ typedef struct RmgrData
extern const RmgrData RmgrTable[];
/*
* Exported to support xlog switching from bgwriter
*/
extern time_t GetLastSegSwitchTime(void);
extern XLogRecPtr RequestXLogSwitch(void);
/*
* These aren't in xlog.h because I'd rather not include fmgr.h there.
*/
@@ -244,6 +252,7 @@ extern Datum pg_start_backup(PG_FUNCTION_ARGS);
extern Datum pg_stop_backup(PG_FUNCTION_ARGS);
extern Datum pg_switch_xlog(PG_FUNCTION_ARGS);
extern Datum pg_current_xlog_location(PG_FUNCTION_ARGS);
extern Datum pg_current_xlog_insert_location(PG_FUNCTION_ARGS);
extern Datum pg_xlogfile_name_offset(PG_FUNCTION_ARGS);
extern Datum pg_xlogfile_name(PG_FUNCTION_ARGS);