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Add monitoring function pg_last_xact_replay_timestamp.

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Fujii Masao, with a little wordsmithing by me.
This commit is contained in:
Robert Haas 2010-11-09 22:39:43 -05:00
parent 844ed5dc97
commit 7ba6e4f0e0
5 changed files with 41 additions and 1 deletions
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19
doc/src/sgml/func.sgml
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@ -13551,6 +13551,9 @@ postgres=# SELECT * FROM pg_xlogfile_name_offset(pg_stop_backup());
<indexterm>
<primary>pg_last_xlog_replay_location</primary>
</indexterm>
<indexterm>
<primary>pg_last_xact_replay_timestamp</primary>
</indexterm>
<para>
The functions shown in <xref
@ -13605,6 +13608,22 @@ postgres=# SELECT * FROM pg_xlogfile_name_offset(pg_stop_backup());
the function returns NULL.
</entry>
</row>
<row>
<entry>
<literal><function>pg_last_xact_replay_timestamp()</function></literal>
</entry>
<entry><type>timestamp with time zone</type></entry>
<entry>Get timestamp of last transaction replayed during recovery.
This is the time at which the commit or abort WAL record for that
transaction was generated.
If no transactions have been replayed during recovery, this function
returns NULL. Otherwise, if recovery is still in progress this will
increase monotonically. If recovery has completed then this value will
remain static at the value of the last transaction applied during that
recovery. When the server has been started normally without recovery
the function returns NULL.
</entry>
</row>
</tbody>
</tgroup>
</table>

18
src/backend/access/transam/xlog.c
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@ -5604,6 +5604,24 @@ GetLatestXTime(void)
return xtime;
}
/*
* Returns timestamp of latest processed commit/abort record.
*
* When the server has been started normally without recovery the function
* returns NULL.
*/
Datum
pg_last_xact_replay_timestamp(PG_FUNCTION_ARGS)
{
TimestampTz xtime;
xtime = GetLatestXTime();
if (xtime == 0)
PG_RETURN_NULL();
PG_RETURN_TIMESTAMPTZ(xtime);
}
/*
* Returns bool with current recovery mode, a global state.
*/

1
src/include/access/xlog_internal.h
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@ -271,6 +271,7 @@ extern Datum pg_current_xlog_location(PG_FUNCTION_ARGS);
extern Datum pg_current_xlog_insert_location(PG_FUNCTION_ARGS);
extern Datum pg_last_xlog_receive_location(PG_FUNCTION_ARGS);
extern Datum pg_last_xlog_replay_location(PG_FUNCTION_ARGS);
extern Datum pg_last_xact_replay_timestamp(PG_FUNCTION_ARGS);
extern Datum pg_xlogfile_name_offset(PG_FUNCTION_ARGS);
extern Datum pg_xlogfile_name(PG_FUNCTION_ARGS);
extern Datum pg_is_in_recovery(PG_FUNCTION_ARGS);

2
src/include/catalog/catversion.h
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@ -53,6 +53,6 @@
*/
/* yyyymmddN */
#define CATALOG_VERSION_NO 201010301
#define CATALOG_VERSION_NO 201011091
#endif

2
src/include/catalog/pg_proc.h
View File

@ -3383,6 +3383,8 @@ DATA(insert OID = 3820 ( pg_last_xlog_receive_location PGNSP PGUID 12 1 0 0 f f
DESCR("current xlog flush location");
DATA(insert OID = 3821 ( pg_last_xlog_replay_location PGNSP PGUID 12 1 0 0 f f f t f v 0 0 25 "" _null_ _null_ _null_ _null_ pg_last_xlog_replay_location _null_ _null_ _null_ ));
DESCR("last xlog replay location");
DATA(insert OID = 3830 ( pg_last_xact_replay_timestamp PGNSP PGUID 12 1 0 0 f f f t f v 0 0 1184 "" _null_ _null_ _null_ _null_ pg_last_xact_replay_timestamp _null_ _null_ _null_ ));
DESCR("timestamp of last replay xact");
DATA(insert OID = 2621 ( pg_reload_conf PGNSP PGUID 12 1 0 0 f f f t f v 0 0 16 "" _null_ _null_ _null_ _null_ pg_reload_conf _null_ _null_ _null_ ));
DESCR("reload configuration files");