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Postgres FD Implementation
Commit 9132b189 authored by Fujii Masao's avatar Fujii Masao
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Add pg_stat_archiver statistics view. 

This view shows the statistics about the WAL archiver process's activity.

Gabriele Bartolini, reviewed by Michael Paquier, refactored a bit by me.
parent 98d62c28
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Showing with 327 additions and 19 deletions
doc/src/sgml/monitoring.sgml
View file @ 9132b189
......@@ -269,6 +269,14 @@ postgres: <replaceable>user</> <replaceable>database</> <replaceable>host</> <re
</entry>
</row>
<row>
<entry><structname>pg_stat_archiver</><indexterm><primary>pg_stat_archiver</primary></indexterm></entry>
<entry>One row only, showing statistics about the
WAL archiver process's activity. See
<xref linkend="pg-stat-archiver-view"> for details.
</entry>
</row>
<row>
<entry><structname>pg_stat_bgwriter</><indexterm><primary>pg_stat_bgwriter</primary></indexterm></entry>
<entry>One row only, showing statistics about the
......@@ -648,6 +656,63 @@ postgres: <replaceable>user</> <replaceable>database</> <replaceable>host</> <re
</para>
</note>
<table id="pg-stat-archiver-view" xreflabel="pg_stat_archiver">
<title><structname>pg_stat_archiver</structname> View</title>
<tgroup cols="3">
<thead>
<row>
<entry>Column</entry>
<entry>Type</entry>
<entry>Description</entry>
</row>
</thead>
<tbody>
<row>
<entry><structfield>archived_count</></entry>
<entry><type>bigint</type></entry>
<entry>Number of WAL files that have been successfully archived</entry>
</row>
<row>
<entry><structfield>last_archived_wal</></entry>
<entry><type>text</type></entry>
<entry>Name of the last WAL file successfully archived</entry>
</row>
<row>
<entry><structfield>last_archived_time</></entry>
<entry><type>timestamp with time zone</type></entry>
<entry>Time of the last successful archive operation</entry>
</row>
<row>
<entry><structfield>failed_count</></entry>
<entry><type>bigint</type></entry>
<entry>Number of failed attempts for archiving WAL files</entry>
</row>
<row>
<entry><structfield>last_failed_wal</></entry>
<entry><type>text</type></entry>
<entry>Name of the WAL file of the last failed archival operation</entry>
</row>
<row>
<entry><structfield>last_failed_time</></entry>
<entry><type>timestamp with time zone</type></entry>
<entry>Time of the last failed archival operation</entry>
</row>
<row>
<entry><structfield>stats_reset</></entry>
<entry><type>timestamp with time zone</type></entry>
<entry>Time at which these statistics were last reset</entry>
</row>
</tbody>
</tgroup>
</table>
<para>
The <structname>pg_stat_archiver</structname> view will always have a
single row, containing data about the archiver process of the cluster.
</para>
<table id="pg-stat-bgwriter-view" xreflabel="pg_stat_bgwriter">
<title><structname>pg_stat_bgwriter</structname> View</title>
......@@ -1613,6 +1678,8 @@ postgres: <replaceable>user</> <replaceable>database</> <replaceable>host</> <re
argument (requires superuser privileges).
Calling <literal>pg_stat_reset_shared('bgwriter')</> will zero all the
counters shown in the <structname>pg_stat_bgwriter</> view.
Calling <literal>pg_stat_reset_shared('archiver')</> will zero all the
counters shown in the <structname>pg_stat_archiver</> view.
</entry>
</row>
......
src/backend/catalog/system_views.sql
View file @ 9132b189
......@@ -672,6 +672,17 @@ CREATE VIEW pg_stat_xact_user_functions AS
WHERE P.prolang != 12 -- fast check to eliminate built-in functions
AND pg_stat_get_xact_function_calls(P.oid) IS NOT NULL;
CREATE VIEW pg_stat_archiver AS
SELECT
s.archived_count,
s.last_archived_wal,
s.last_archived_time,
s.failed_count,
s.last_failed_wal,
s.last_failed_time,
s.stats_reset
FROM pg_stat_get_archiver() s;
CREATE VIEW pg_stat_bgwriter AS
SELECT
pg_stat_get_bgwriter_timed_checkpoints() AS checkpoints_timed,
......
src/backend/postmaster/pgarch.c
View file @ 9132b189
......@@ -36,6 +36,7 @@
#include "access/xlog_internal.h"
#include "libpq/pqsignal.h"
#include "miscadmin.h"
#include "pgstat.h"
#include "postmaster/fork_process.h"
#include "postmaster/pgarch.h"
#include "postmaster/postmaster.h"
......@@ -58,19 +59,6 @@
#define PGARCH_RESTART_INTERVAL 10 /* How often to attempt to restart a
* failed archiver; in seconds. */
/* ----------
* Archiver control info.
*
* We expect that archivable files within pg_xlog will have names between
* MIN_XFN_CHARS and MAX_XFN_CHARS in length, consisting only of characters
* appearing in VALID_XFN_CHARS. The status files in archive_status have
* corresponding names with ".ready" or ".done" appended.
* ----------
*/
#define MIN_XFN_CHARS 16
#define MAX_XFN_CHARS 40
#define VALID_XFN_CHARS "0123456789ABCDEF.history.backup"
#define NUM_ARCHIVE_RETRIES 3
......@@ -496,10 +484,17 @@ pgarch_ArchiverCopyLoop(void)
{
/* successful */
pgarch_archiveDone(xlog);
/* Tell the collector about the WAL file that we successfully archived */
pgstat_send_archiver(xlog, false);
break; /* out of inner retry loop */
}
else
{
/* Tell the collector about the WAL file that we failed to archive */
pgstat_send_archiver(xlog, true);
if (++failures >= NUM_ARCHIVE_RETRIES)
{
ereport(WARNING,
......
src/backend/postmaster/pgstat.c
View file @ 9132b189
......@@ -221,6 +221,7 @@ static int localNumBackends = 0;
* Contains statistics that are not collected per database
* or per table.
*/
static PgStat_ArchiverStats archiverStats;
static PgStat_GlobalStats globalStats;
/* Write request info for each database */
......@@ -292,6 +293,7 @@ static void pgstat_recv_resetsinglecounter(PgStat_MsgResetsinglecounter *msg, in
static void pgstat_recv_autovac(PgStat_MsgAutovacStart *msg, int len);
static void pgstat_recv_vacuum(PgStat_MsgVacuum *msg, int len);
static void pgstat_recv_analyze(PgStat_MsgAnalyze *msg, int len);
static void pgstat_recv_archiver(PgStat_MsgArchiver *msg, int len);
static void pgstat_recv_bgwriter(PgStat_MsgBgWriter *msg, int len);
static void pgstat_recv_funcstat(PgStat_MsgFuncstat *msg, int len);
static void pgstat_recv_funcpurge(PgStat_MsgFuncpurge *msg, int len);
......@@ -1257,13 +1259,15 @@ pgstat_reset_shared_counters(const char *target)
(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
errmsg("must be superuser to reset statistics counters")));
if (strcmp(target, "bgwriter") == 0)
if (strcmp(target, "archiver") == 0)
msg.m_resettarget = RESET_ARCHIVER;
else if (strcmp(target, "bgwriter") == 0)
msg.m_resettarget = RESET_BGWRITER;
else
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("unrecognized reset target: \"%s\"", target),
errhint("Target must be \"bgwriter\".")));
errhint("Target must be \"archiver\" or \"bgwriter\".")));
pgstat_setheader(&msg.m_hdr, PGSTAT_MTYPE_RESETSHAREDCOUNTER);
pgstat_send(&msg, sizeof(msg));
......@@ -2321,6 +2325,23 @@ pgstat_fetch_stat_numbackends(void)
return localNumBackends;
}
/*
* ---------
* pgstat_fetch_stat_archiver() -
*
* Support function for the SQL-callable pgstat* functions. Returns
* a pointer to the archiver statistics struct.
* ---------
*/
PgStat_ArchiverStats *
pgstat_fetch_stat_archiver(void)
{
backend_read_statsfile();
return &archiverStats;
}
/*
* ---------
* pgstat_fetch_global() -
......@@ -3035,6 +3056,28 @@ pgstat_send(void *msg, int len)
#endif
}
/* ----------
* pgstat_send_archiver() -
*
* Tell the collector about the WAL file that we successfully
* archived or failed to archive.
* ----------
*/
void
pgstat_send_archiver(const char *xlog, bool failed)
{
PgStat_MsgArchiver msg;
/*
* Prepare and send the message
*/
pgstat_setheader(&msg.m_hdr, PGSTAT_MTYPE_ARCHIVER);
msg.m_failed = failed;
strncpy(msg.m_xlog, xlog, sizeof(msg.m_xlog));
msg.m_timestamp = GetCurrentTimestamp();
pgstat_send(&msg, sizeof(msg));
}
/* ----------
* pgstat_send_bgwriter() -
*
......@@ -3278,6 +3321,10 @@ PgstatCollectorMain(int argc, char *argv[])
pgstat_recv_analyze((PgStat_MsgAnalyze *) &msg, len);
break;
case PGSTAT_MTYPE_ARCHIVER:
pgstat_recv_archiver((PgStat_MsgArchiver *) &msg, len);
break;
case PGSTAT_MTYPE_BGWRITER:
pgstat_recv_bgwriter((PgStat_MsgBgWriter *) &msg, len);
break;
......@@ -3562,6 +3609,12 @@ pgstat_write_statsfiles(bool permanent, bool allDbs)
rc = fwrite(&globalStats, sizeof(globalStats), 1, fpout);
(void) rc; /* we'll check for error with ferror */
/*
* Write archiver stats struct
*/
rc = fwrite(&archiverStats, sizeof(archiverStats), 1, fpout);
(void) rc; /* we'll check for error with ferror */
/*
* Walk through the database table.
*/
......@@ -3828,16 +3881,18 @@ pgstat_read_statsfiles(Oid onlydb, bool permanent, bool deep)
HASH_ELEM | HASH_FUNCTION | HASH_CONTEXT);
/*
* Clear out global statistics so they start from zero in case we can't
* load an existing statsfile.
* Clear out global and archiver statistics so they start from zero
* in case we can't load an existing statsfile.
*/
memset(&globalStats, 0, sizeof(globalStats));
memset(&archiverStats, 0, sizeof(archiverStats));
/*
* Set the current timestamp (will be kept only in case we can't load an
* existing statsfile).
*/
globalStats.stat_reset_timestamp = GetCurrentTimestamp();
archiverStats.stat_reset_timestamp = globalStats.stat_reset_timestamp;
/*
* Try to open the stats file. If it doesn't exist, the backends simply
......@@ -3879,6 +3934,16 @@ pgstat_read_statsfiles(Oid onlydb, bool permanent, bool deep)
goto done;
}
/*
* Read archiver stats struct
*/
if (fread(&archiverStats, 1, sizeof(archiverStats), fpin) != sizeof(archiverStats))
{
ereport(pgStatRunningInCollector ? LOG : WARNING,
(errmsg("corrupted statistics file \"%s\"", statfile)));
goto done;
}
/*
* We found an existing collector stats file. Read it and put all the
* hashtable entries into place.
......@@ -4159,7 +4224,7 @@ done:
* stats_timestamp value.
*
* - if there's no db stat entry (e.g. for a new or inactive database),
* there's no stat_timestamp value, but also nothing to write so we return
* there's no stats_timestamp value, but also nothing to write so we return
* the timestamp of the global statfile.
* ----------
*/
......@@ -4169,6 +4234,7 @@ pgstat_read_db_statsfile_timestamp(Oid databaseid, bool permanent,
{
PgStat_StatDBEntry dbentry;
PgStat_GlobalStats myGlobalStats;
PgStat_ArchiverStats myArchiverStats;
FILE *fpin;
int32 format_id;
const char *statfile = permanent ? PGSTAT_STAT_PERMANENT_FILENAME : pgstat_stat_filename;
......@@ -4211,6 +4277,18 @@ pgstat_read_db_statsfile_timestamp(Oid databaseid, bool permanent,
return false;
}
/*
* Read archiver stats struct
*/
if (fread(&myArchiverStats, 1, sizeof(myArchiverStats),
fpin) != sizeof(myArchiverStats))
{
ereport(pgStatRunningInCollector ? LOG : WARNING,
(errmsg("corrupted statistics file \"%s\"", statfile)));
FreeFile(fpin);
return false;
}
/* By default, we're going to return the timestamp of the global file. */
*ts = myGlobalStats.stats_timestamp;
......@@ -4738,6 +4816,12 @@ pgstat_recv_resetsharedcounter(PgStat_MsgResetsharedcounter *msg, int len)
memset(&globalStats, 0, sizeof(globalStats));
globalStats.stat_reset_timestamp = GetCurrentTimestamp();
}
else if (msg->m_resettarget == RESET_ARCHIVER)
{
/* Reset the archiver statistics for the cluster. */
memset(&archiverStats, 0, sizeof(archiverStats));
archiverStats.stat_reset_timestamp = GetCurrentTimestamp();
}
/*
* Presumably the sender of this message validated the target, don't
......@@ -4867,6 +4951,33 @@ pgstat_recv_analyze(PgStat_MsgAnalyze *msg, int len)
}
/* ----------
* pgstat_recv_archiver() -
*
* Process a ARCHIVER message.
* ----------
*/
static void
pgstat_recv_archiver(PgStat_MsgArchiver *msg, int len)
{
if (msg->m_failed)
{
/* Failed archival attempt */
++archiverStats.failed_count;
memcpy(archiverStats.last_failed_wal, msg->m_xlog,
sizeof(archiverStats.last_failed_wal));
archiverStats.last_failed_timestamp = msg->m_timestamp;
}
else
{
/* Successful archival operation */
++archiverStats.archived_count;
memcpy(archiverStats.last_archived_wal, msg->m_xlog,
sizeof(archiverStats.last_archived_wal));
archiverStats.last_archived_timestamp = msg->m_timestamp;
}
}
/* ----------
* pgstat_recv_bgwriter() -
*
......
src/backend/utils/adt/pgstatfuncs.c
View file @ 9132b189
......@@ -87,6 +87,8 @@ extern Datum pg_stat_get_db_temp_bytes(PG_FUNCTION_ARGS);
extern Datum pg_stat_get_db_blk_read_time(PG_FUNCTION_ARGS);
extern Datum pg_stat_get_db_blk_write_time(PG_FUNCTION_ARGS);
extern Datum pg_stat_get_archiver(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_checkpoint_write_time(PG_FUNCTION_ARGS);
......@@ -1712,3 +1714,70 @@ pg_stat_reset_single_function_counters(PG_FUNCTION_ARGS)
PG_RETURN_VOID();
}
Datum
pg_stat_get_archiver(PG_FUNCTION_ARGS)
{
TupleDesc tupdesc;
Datum values[7];
bool nulls[7];
PgStat_ArchiverStats *archiver_stats;
/* Initialise values and NULL flags arrays */
MemSet(values, 0, sizeof(values));
MemSet(nulls, 0, sizeof(nulls));
/* Initialise attributes information in the tuple descriptor */
tupdesc = CreateTemplateTupleDesc(7, false);
TupleDescInitEntry(tupdesc, (AttrNumber) 1, "archived_count",
INT8OID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 2, "last_archived_wal",
TEXTOID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 3, "last_archived_time",
TIMESTAMPTZOID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 4, "failed_count",
INT8OID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 5, "last_failed_wal",
TEXTOID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 6, "last_failed_time",
TIMESTAMPTZOID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 7, "stats_reset",
TIMESTAMPTZOID, -1, 0);
BlessTupleDesc(tupdesc);
/* Get statistics about the archiver process */
archiver_stats = pgstat_fetch_stat_archiver();
/* Fill values and NULLs */
values[0] = Int64GetDatum(archiver_stats->archived_count);
if (archiver_stats->last_archived_wal == 0)
nulls[1] = true;
else
values[1] = CStringGetTextDatum(archiver_stats->last_archived_wal);
if (archiver_stats->last_archived_timestamp == 0)
nulls[2] = true;
else
values[2] = TimestampTzGetDatum(archiver_stats->last_archived_timestamp);
values[3] = Int64GetDatum(archiver_stats->failed_count);
if (archiver_stats->last_failed_wal == 0)
nulls[4] = true;
else
values[4] = CStringGetTextDatum(archiver_stats->last_failed_wal);
if (archiver_stats->last_failed_timestamp == 0)
nulls[5] = true;
else
values[5] = TimestampTzGetDatum(archiver_stats->last_failed_timestamp);
if (archiver_stats->stat_reset_timestamp == 0)
nulls[6] = true;
else
values[6] = TimestampTzGetDatum(archiver_stats->stat_reset_timestamp);
/* Returns the record as Datum */
PG_RETURN_DATUM(HeapTupleGetDatum(
heap_form_tuple(tupdesc, values, nulls)));
}
src/include/catalog/pg_proc.h
View file @ 9132b189
......@@ -2702,6 +2702,8 @@ DATA(insert OID = 2844 ( pg_stat_get_db_blk_read_time PGNSP PGUID 12 1 0 0 0 f
DESCR("statistics: block read time, in msec");
DATA(insert OID = 2845 ( pg_stat_get_db_blk_write_time PGNSP PGUID 12 1 0 0 0 f f f f t f s 1 0 701 "26" _null_ _null_ _null_ _null_ pg_stat_get_db_blk_write_time _null_ _null_ _null_ ));
DESCR("statistics: block write time, in msec");
DATA(insert OID = 3195 ( pg_stat_get_archiver PGNSP PGUID 12 1 0 0 0 f f f f f f s 0 0 2249 "" "{20,25,1184,20,25,1184,1184}" "{o,o,o,o,o,o,o}" "{archived_count,last_archived_wal,last_archived_time,failed_count,last_failed_wal,last_failed_time,stats_reset}" _null_ pg_stat_get_archiver _null_ _null_ _null_ ));
DESCR("statistics: information about WAL archiver");
DATA(insert OID = 2769 ( pg_stat_get_bgwriter_timed_checkpoints PGNSP PGUID 12 1 0 0 0 f 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 0 f f f f t f s 0 0 20 "" _null_ _null_ _null_ _null_ pg_stat_get_bgwriter_requested_checkpoints _null_ _null_ _null_ ));
......
src/include/pgstat.h
View file @ 9132b189
......@@ -15,6 +15,7 @@
#include "fmgr.h"
#include "libpq/pqcomm.h"
#include "portability/instr_time.h"
#include "postmaster/pgarch.h"
#include "utils/hsearch.h"
#include "utils/relcache.h"
......@@ -44,6 +45,7 @@ typedef enum StatMsgType
PGSTAT_MTYPE_AUTOVAC_START,
PGSTAT_MTYPE_VACUUM,
PGSTAT_MTYPE_ANALYZE,
PGSTAT_MTYPE_ARCHIVER,
PGSTAT_MTYPE_BGWRITER,
PGSTAT_MTYPE_FUNCSTAT,
PGSTAT_MTYPE_FUNCPURGE,
......@@ -102,6 +104,7 @@ typedef struct PgStat_TableCounts
/* Possible targets for resetting cluster-wide shared values */
typedef enum PgStat_Shared_Reset_Target
{
RESET_ARCHIVER,
RESET_BGWRITER
} PgStat_Shared_Reset_Target;
......@@ -355,6 +358,18 @@ typedef struct PgStat_MsgAnalyze
} PgStat_MsgAnalyze;
/* ----------
* PgStat_MsgArchiver Sent by the archiver to update statistics.
* ----------
*/
typedef struct PgStat_MsgArchiver
{
PgStat_MsgHdr m_hdr;
bool m_failed; /* Failed attempt */
char m_xlog[MAX_XFN_CHARS + 1];
TimestampTz m_timestamp;
} PgStat_MsgArchiver;
/* ----------
* PgStat_MsgBgWriter Sent by the bgwriter to update statistics.
* ----------
......@@ -502,6 +517,7 @@ typedef union PgStat_Msg
PgStat_MsgAutovacStart msg_autovacuum;
PgStat_MsgVacuum msg_vacuum;
PgStat_MsgAnalyze msg_analyze;
PgStat_MsgArchiver msg_archiver;
PgStat_MsgBgWriter msg_bgwriter;
PgStat_MsgFuncstat msg_funcstat;
PgStat_MsgFuncpurge msg_funcpurge;
......@@ -518,7 +534,7 @@ typedef union PgStat_Msg
* ------------------------------------------------------------
*/
#define PGSTAT_FILE_FORMAT_ID 0x01A5BC9B
#define PGSTAT_FILE_FORMAT_ID 0x01A5BC9C
/* ----------
* PgStat_StatDBEntry The collector's data per database
......@@ -611,6 +627,20 @@ typedef struct PgStat_StatFuncEntry
} PgStat_StatFuncEntry;
/*
* Archiver statistics kept in the stats collector
*/
typedef struct PgStat_ArchiverStats
{
PgStat_Counter archived_count; /* archival successes */
char last_archived_wal[MAX_XFN_CHARS + 1]; /* last WAL file archived */
TimestampTz last_archived_timestamp; /* last archival success time */
PgStat_Counter failed_count; /* failed archival attempts */
char last_failed_wal[MAX_XFN_CHARS + 1]; /* WAL file involved in last failure */
TimestampTz last_failed_timestamp; /* last archival failure time */
TimestampTz stat_reset_timestamp;
} PgStat_ArchiverStats;
/*
* Global statistics kept in the stats collector
*/
......@@ -863,6 +893,7 @@ extern void pgstat_twophase_postcommit(TransactionId xid, uint16 info,
extern void pgstat_twophase_postabort(TransactionId xid, uint16 info,
void *recdata, uint32 len);
extern void pgstat_send_archiver(const char *xlog, bool failed);
extern void pgstat_send_bgwriter(void);
/* ----------
......@@ -875,6 +906,7 @@ extern PgStat_StatTabEntry *pgstat_fetch_stat_tabentry(Oid relid);
extern PgBackendStatus *pgstat_fetch_stat_beentry(int beid);
extern PgStat_StatFuncEntry *pgstat_fetch_stat_funcentry(Oid funcid);
extern int pgstat_fetch_stat_numbackends(void);
extern PgStat_ArchiverStats *pgstat_fetch_stat_archiver(void);
extern PgStat_GlobalStats *pgstat_fetch_global(void);
#endif /* PGSTAT_H */
src/include/postmaster/pgarch.h
View file @ 9132b189
......@@ -13,6 +13,19 @@
#ifndef _PGARCH_H
#define _PGARCH_H
/* ----------
* Archiver control info.
*
* We expect that archivable files within pg_xlog will have names between
* MIN_XFN_CHARS and MAX_XFN_CHARS in length, consisting only of characters
* appearing in VALID_XFN_CHARS. The status files in archive_status have
* corresponding names with ".ready" or ".done" appended.
* ----------
*/
#define MIN_XFN_CHARS 16
#define MAX_XFN_CHARS 40
#define VALID_XFN_CHARS "0123456789ABCDEF.history.backup"
/* ----------
* Functions called from postmaster
* ----------
......
src/test/regress/expected/rules.out
View file @ 9132b189
......@@ -1640,6 +1640,14 @@ pg_stat_all_tables| SELECT c.oid AS relid,
LEFT JOIN pg_namespace n ON ((n.oid = c.relnamespace)))
WHERE (c.relkind = ANY (ARRAY['r'::"char", 't'::"char", 'm'::"char"]))
GROUP BY c.oid, n.nspname, c.relname;
pg_stat_archiver| SELECT s.archived_count,
s.last_archived_wal,
s.last_archived_time,
s.failed_count,
s.last_failed_wal,
s.last_failed_time,
s.stats_reset
FROM pg_stat_get_archiver() s(archived_count, last_archived_wal, last_archived_time, failed_count, last_failed_wal, last_failed_time, stats_reset);
pg_stat_bgwriter| SELECT pg_stat_get_bgwriter_timed_checkpoints() AS checkpoints_timed,
pg_stat_get_bgwriter_requested_checkpoints() AS checkpoints_req,
pg_stat_get_checkpoint_write_time() AS checkpoint_write_time,
......
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