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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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14
src/backend/utils/misc/guc.c
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@ -10,7 +10,7 @@
* Written by Peter Eisentraut <peter_e@gmx.net>.
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/utils/misc/guc.c,v 1.342 2006/08/15 18:26:59 tgl Exp $
* $PostgreSQL: pgsql/src/backend/utils/misc/guc.c,v 1.343 2006/08/17 23:04:06 tgl Exp $
*
*--------------------------------------------------------------------
*/
@ -1001,7 +1001,7 @@ static struct config_bool ConfigureNamesBool[] =
{
{"ignore_system_indexes", PGC_BACKEND, DEVELOPER_OPTIONS,
gettext_noop("Disabled reading from system indexes."),
gettext_noop("Disables reading from system indexes."),
gettext_noop("It does not prevent updating the indexes, so it is safe "
"to use. The worst consequence is slowness."),
GUC_NOT_IN_SAMPLE
@ -1019,6 +1019,16 @@ static struct config_bool ConfigureNamesBool[] =
static struct config_int ConfigureNamesInt[] =
{
{
{"archive_timeout", PGC_SIGHUP, WAL_SETTINGS,
gettext_noop("Forces a switch to the next xlog file if a "
"new file has not been started within N seconds."),
NULL,
GUC_UNIT_S
},
&XLogArchiveTimeout,
0, 0, INT_MAX, NULL, NULL
},
{
{"post_auth_delay", PGC_BACKEND, DEVELOPER_OPTIONS,
gettext_noop("Waits N seconds on connection startup after authentication."),