Dne 30.1.2011 23:22, Robert Haas napsal(a):
> On Thu, Dec 23, 2010 at 2:41 PM, Tomas Vondra <[email protected]> wrote:
>>>> OK, so here goes the simplified patch - it tracks one reset timestamp
>>>> for a background writer and for each database.
>>>
>>> I think you forgot the attachment.
>>
>> Yes, I did. Thanks!
>
> This patch no longer applies. Please update.
I've updated the patch - rebased to the current HEAD.
regards
Tomas
*** a/doc/src/sgml/monitoring.sgml
--- b/doc/src/sgml/monitoring.sgml
***************
*** 663,668 **** postgres: <replaceable>user</> <replaceable>database</>
<replaceable>host</> <re
--- 663,677 ----
</row>
<row>
+
<entry><literal><function>pg_stat_get_db_stat_reset_time</function>(<type>oid</type>)</literal></entry>
+ <entry><type>timestamptz</type></entry>
+ <entry>
+ Time of the last reset of statistics for this database (as a result of
executing
+ <function>pg_stat_reset</function> function) or any object within it
(table or index).
+ </entry>
+ </row>
+
+ <row>
<entry><literal><function>pg_stat_get_numscans</function>(<type>oid</type>)</literal></entry>
<entry><type>bigint</type></entry>
<entry>
***************
*** 1125,1130 **** postgres: <replaceable>user</> <replaceable>database</>
<replaceable>host</> <re
--- 1134,1148 ----
<varname>bgwriter_lru_maxpages</varname> parameter
</entry>
</row>
+
+ <row>
+
<entry><literal><function>pg_stat_get_bgwriter_stat_reset_time()</function></literal></entry>
+ <entry><type>timestamptz</type></entry>
+ <entry>
+ Time of the last reset of statistics for the background writer (as a
result of executing
+ <function>pg_stat_reset_shared('bgwriter')</function>)
+ </entry>
+ </row>
<row>
<entry><literal><function>pg_stat_get_buf_written_backend()</function></literal></entry>
*** a/src/backend/catalog/system_views.sql
--- b/src/backend/catalog/system_views.sql
***************
*** 523,529 **** CREATE VIEW pg_stat_database AS
pg_stat_get_db_tuples_inserted(D.oid) AS tup_inserted,
pg_stat_get_db_tuples_updated(D.oid) AS tup_updated,
pg_stat_get_db_tuples_deleted(D.oid) AS tup_deleted,
! pg_stat_get_db_conflict_all(D.oid) AS conflicts
FROM pg_database D;
CREATE VIEW pg_stat_database_conflicts AS
--- 523,530 ----
pg_stat_get_db_tuples_inserted(D.oid) AS tup_inserted,
pg_stat_get_db_tuples_updated(D.oid) AS tup_updated,
pg_stat_get_db_tuples_deleted(D.oid) AS tup_deleted,
! pg_stat_get_db_conflict_all(D.oid) AS conflicts,
! pg_stat_get_db_stat_reset_time(D.oid) AS stats_reset
FROM pg_database D;
CREATE VIEW pg_stat_database_conflicts AS
***************
*** 570,576 **** CREATE VIEW pg_stat_bgwriter AS
pg_stat_get_bgwriter_maxwritten_clean() AS maxwritten_clean,
pg_stat_get_buf_written_backend() AS buffers_backend,
pg_stat_get_buf_fsync_backend() AS buffers_backend_fsync,
! pg_stat_get_buf_alloc() AS buffers_alloc;
CREATE VIEW pg_user_mappings AS
SELECT
--- 571,578 ----
pg_stat_get_bgwriter_maxwritten_clean() AS maxwritten_clean,
pg_stat_get_buf_written_backend() AS buffers_backend,
pg_stat_get_buf_fsync_backend() AS buffers_backend_fsync,
! pg_stat_get_buf_alloc() AS buffers_alloc,
! pg_stat_get_bgwriter_stat_reset_time() AS stats_reset;
CREATE VIEW pg_user_mappings AS
SELECT
*** a/src/backend/postmaster/pgstat.c
--- b/src/backend/postmaster/pgstat.c
***************
*** 3160,3165 **** pgstat_get_db_entry(Oid databaseid, bool create)
--- 3160,3167 ----
result->n_conflict_bufferpin = 0;
result->n_conflict_startup_deadlock = 0;
+ result->stat_reset_timestamp = GetCurrentTimestamp();
+
memset(&hash_ctl, 0, sizeof(hash_ctl));
hash_ctl.keysize = sizeof(Oid);
hash_ctl.entrysize = sizeof(PgStat_StatTabEntry);
***************
*** 3438,3443 **** pgstat_read_statsfile(Oid onlydb, bool permanent)
--- 3440,3451 ----
* load an existing statsfile.
*/
memset(&globalStats, 0, sizeof(globalStats));
+
+ /*
+ * Set the current timestamp (will be kept only in case we can't load an
+ * existing statsfile.
+ */
+ globalStats.stat_reset_timestamp = GetCurrentTimestamp();
/*
* Try to open the status file. If it doesn't exist, the backends simply
***************
*** 4052,4057 **** pgstat_recv_resetcounter(PgStat_MsgResetcounter *msg, int
len)
--- 4060,4067 ----
dbentry->n_tuples_deleted = 0;
dbentry->last_autovac_time = 0;
+ dbentry->stat_reset_timestamp = GetCurrentTimestamp();
+
memset(&hash_ctl, 0, sizeof(hash_ctl));
hash_ctl.keysize = sizeof(Oid);
hash_ctl.entrysize = sizeof(PgStat_StatTabEntry);
***************
*** 4083,4088 **** pgstat_recv_resetsharedcounter(PgStat_MsgResetsharedcounter
*msg, int len)
--- 4093,4099 ----
{
/* Reset the global background writer statistics for the
cluster. */
memset(&globalStats, 0, sizeof(globalStats));
+ globalStats.stat_reset_timestamp = GetCurrentTimestamp();
}
/*
***************
*** 4107,4112 **** pgstat_recv_resetsinglecounter(PgStat_MsgResetsinglecounter
*msg, int len)
--- 4118,4125 ----
if (!dbentry)
return;
+ /* Set the reset timestamp for the whole database */
+ dbentry->stat_reset_timestamp = GetCurrentTimestamp();
/* Remove object if it exists, ignore it if not */
if (msg->m_resettype == RESET_TABLE)
*** a/src/backend/utils/adt/pgstatfuncs.c
--- b/src/backend/utils/adt/pgstatfuncs.c
***************
*** 77,88 **** extern Datum pg_stat_get_db_conflict_snapshot(PG_FUNCTION_ARGS);
--- 77,90 ----
extern Datum pg_stat_get_db_conflict_bufferpin(PG_FUNCTION_ARGS);
extern Datum pg_stat_get_db_conflict_startup_deadlock(PG_FUNCTION_ARGS);
extern Datum pg_stat_get_db_conflict_all(PG_FUNCTION_ARGS);
+ extern Datum pg_stat_get_db_stat_reset_time(PG_FUNCTION_ARGS);
extern Datum pg_stat_get_bgwriter_timed_checkpoints(PG_FUNCTION_ARGS);
extern Datum pg_stat_get_bgwriter_requested_checkpoints(PG_FUNCTION_ARGS);
extern Datum pg_stat_get_bgwriter_buf_written_checkpoints(PG_FUNCTION_ARGS);
extern Datum pg_stat_get_bgwriter_buf_written_clean(PG_FUNCTION_ARGS);
extern Datum pg_stat_get_bgwriter_maxwritten_clean(PG_FUNCTION_ARGS);
+ extern Datum pg_stat_get_bgwriter_stat_reset_time(PG_FUNCTION_ARGS);
extern Datum pg_stat_get_buf_written_backend(PG_FUNCTION_ARGS);
extern Datum pg_stat_get_buf_fsync_backend(PG_FUNCTION_ARGS);
extern Datum pg_stat_get_buf_alloc(PG_FUNCTION_ARGS);
***************
*** 1134,1139 **** pg_stat_get_db_tuples_deleted(PG_FUNCTION_ARGS)
--- 1136,1159 ----
PG_RETURN_INT64(result);
}
+
+ Datum
+ pg_stat_get_db_stat_reset_time(PG_FUNCTION_ARGS)
+ {
+ Oid dbid = PG_GETARG_OID(0);
+ TimestampTz result;
+ PgStat_StatDBEntry *dbentry;
+
+ if ((dbentry = pgstat_fetch_stat_dbentry(dbid)) == NULL)
+ result = 0;
+ else
+ result = dbentry->stat_reset_timestamp;
+
+ if (result == 0)
+ PG_RETURN_NULL();
+ else
+ PG_RETURN_TIMESTAMPTZ(result);
+ }
Datum
pg_stat_get_db_conflict_tablespace(PG_FUNCTION_ARGS)
***************
*** 1261,1266 **** pg_stat_get_bgwriter_maxwritten_clean(PG_FUNCTION_ARGS)
--- 1281,1292 ----
}
Datum
+ pg_stat_get_bgwriter_stat_reset_time(PG_FUNCTION_ARGS)
+ {
+ PG_RETURN_TIMESTAMPTZ(pgstat_fetch_global()->stat_reset_timestamp);
+ }
+
+ Datum
pg_stat_get_buf_written_backend(PG_FUNCTION_ARGS)
{
PG_RETURN_INT64(pgstat_fetch_global()->buf_written_backend);
*** a/src/include/catalog/pg_proc.h
--- b/src/include/catalog/pg_proc.h
***************
*** 3131,3136 **** DATA(insert OID = 3069 (
pg_stat_get_db_conflict_startup_deadlock PGNSP PGUID 1
--- 3131,3138 ----
DESCR("statistics: recovery conflicts in database caused by buffer deadlock");
DATA(insert OID = 3070 ( pg_stat_get_db_conflict_all PGNSP PGUID 12 1 0 0 f
f f t f s 1 0 20 "26" _null_ _null_ _null_ _null_ pg_stat_get_db_conflict_all
_null_ _null_ _null_ ));
DESCR("statistics: recovery conflicts in database");
+ DATA(insert OID = 3116 ( pg_stat_get_db_stat_reset_time PGNSP PGUID 12 1 0 0
f f f t f s 1 0 1184 "26" _null_ _null_ _null_ _null_
pg_stat_get_db_stat_reset_time _null_ _null_ _null_ ));
+ DESCR("statistics: last reset for a database");
DATA(insert OID = 2769 ( pg_stat_get_bgwriter_timed_checkpoints PGNSP PGUID
12 1 0 0 f f f t f s 0 0 20 "" _null_ _null_ _null_ _null_
pg_stat_get_bgwriter_timed_checkpoints _null_ _null_ _null_ ));
DESCR("statistics: number of timed checkpoints started by the bgwriter");
DATA(insert OID = 2770 ( pg_stat_get_bgwriter_requested_checkpoints PGNSP
PGUID 12 1 0 0 f f f t f s 0 0 20 "" _null_ _null_ _null_ _null_
pg_stat_get_bgwriter_requested_checkpoints _null_ _null_ _null_ ));
***************
*** 3141,3146 **** DATA(insert OID = 2772 (
pg_stat_get_bgwriter_buf_written_clean PGNSP PGUID 12 1
--- 3143,3150 ----
DESCR("statistics: number of buffers written by the bgwriter for cleaning
dirty buffers");
DATA(insert OID = 2773 ( pg_stat_get_bgwriter_maxwritten_clean PGNSP PGUID 12
1 0 0 f f f t f s 0 0 20 "" _null_ _null_ _null_ _null_
pg_stat_get_bgwriter_maxwritten_clean _null_ _null_ _null_ ));
DESCR("statistics: number of times the bgwriter stopped processing when it
had written too many buffers while cleaning");
+ DATA(insert OID = 3118 ( pg_stat_get_bgwriter_stat_reset_time PGNSP PGUID 12
1 0 0 f f f t f s 0 0 1184 "" _null_ _null_ _null_ _null_
pg_stat_get_bgwriter_stat_reset_time _null_ _null_ _null_ ));
+ DESCR("statistics: last reset for the bgwriter");
DATA(insert OID = 2775 ( pg_stat_get_buf_written_backend PGNSP PGUID 12 1 0 0
f f f t f s 0 0 20 "" _null_ _null_ _null_ _null_
pg_stat_get_buf_written_backend _null_ _null_ _null_ ));
DESCR("statistics: number of buffers written by backends");
DATA(insert OID = 3063 ( pg_stat_get_buf_fsync_backend PGNSP PGUID 12 1 0 0 f
f f t f s 0 0 20 "" _null_ _null_ _null_ _null_ pg_stat_get_buf_fsync_backend
_null_ _null_ _null_ ));
*** a/src/include/pgstat.h
--- b/src/include/pgstat.h
***************
*** 503,514 **** typedef struct PgStat_StatDBEntry
--- 503,516 ----
PgStat_Counter n_tuples_updated;
PgStat_Counter n_tuples_deleted;
TimestampTz last_autovac_time;
+
PgStat_Counter n_conflict_tablespace;
PgStat_Counter n_conflict_lock;
PgStat_Counter n_conflict_snapshot;
PgStat_Counter n_conflict_bufferpin;
PgStat_Counter n_conflict_startup_deadlock;
+ TimestampTz stat_reset_timestamp;
/*
* tables and functions must be last in the struct, because we don't
write
***************
*** 584,589 **** typedef struct PgStat_GlobalStats
--- 586,594 ----
PgStat_Counter buf_written_backend;
PgStat_Counter buf_fsync_backend;
PgStat_Counter buf_alloc;
+
+ TimestampTz stat_reset_timestamp;
+
} PgStat_GlobalStats;
--
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