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Add pg_stat_wal statistics view.

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This view shows the statistics about WAL activity. Currently it has only
two columns: wal_buffers_full and stats_reset. wal_buffers_full column
indicates the number of times WAL data was written to the disk because
WAL buffers got full. This information is useful when tuning wal_buffers.
stats_reset column indicates the time at which these statistics were
last reset.

pg_stat_wal view is also the basic infrastructure to expose other
various statistics about WAL activity later.

Bump PGSTAT_FILE_FORMAT_ID due to the change in pgstat format.

Bump catalog version.

Author: Masahiro Ikeda
Reviewed-by: Takayuki Tsunakawa, Kyotaro Horiguchi, Amit Kapila, Fujii Masao
Discussion: https://postgr.es/m/188bd3f2d2233cf97753b5ced02bb050@oss.nttdata.com
This commit is contained in:
Fujii Masao
2020-10-02 10:17:11 +09:00
parent 9d0bd95fa9
commit 8d9a935965
13 changed files with 276 additions and 11 deletions
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33
src/include/pgstat.h
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@ -61,6 +61,7 @@ typedef enum StatMsgType
PGSTAT_MTYPE_ANALYZE,
PGSTAT_MTYPE_ARCHIVER,
PGSTAT_MTYPE_BGWRITER,
PGSTAT_MTYPE_WAL,
PGSTAT_MTYPE_SLRU,
PGSTAT_MTYPE_FUNCSTAT,
PGSTAT_MTYPE_FUNCPURGE,
@ -122,7 +123,8 @@ typedef struct PgStat_TableCounts
typedef enum PgStat_Shared_Reset_Target
{
RESET_ARCHIVER,
RESET_BGWRITER
RESET_BGWRITER,
RESET_WAL
} PgStat_Shared_Reset_Target;
/* Possible object types for resetting single counters */
@ -436,6 +438,16 @@ typedef struct PgStat_MsgBgWriter
PgStat_Counter m_checkpoint_sync_time;
} PgStat_MsgBgWriter;
/* ----------
* PgStat_MsgWal Sent by backends and background processes to update WAL statistics.
* ----------
*/
typedef struct PgStat_MsgWal
{
PgStat_MsgHdr m_hdr;
PgStat_Counter m_wal_buffers_full;
} PgStat_MsgWal;
/* ----------
* PgStat_MsgSLRU Sent by a backend to update SLRU statistics.
* ----------
@ -596,6 +608,7 @@ typedef union PgStat_Msg
PgStat_MsgAnalyze msg_analyze;
PgStat_MsgArchiver msg_archiver;
PgStat_MsgBgWriter msg_bgwriter;
PgStat_MsgWal msg_wal;
PgStat_MsgSLRU msg_slru;
PgStat_MsgFuncstat msg_funcstat;
PgStat_MsgFuncpurge msg_funcpurge;
@ -614,7 +627,7 @@ typedef union PgStat_Msg
* ------------------------------------------------------------
*/
#define PGSTAT_FILE_FORMAT_ID 0x01A5BC9D
#define PGSTAT_FILE_FORMAT_ID 0x01A5BC9E
/* ----------
* PgStat_StatDBEntry The collector's data per database
@ -745,6 +758,15 @@ typedef struct PgStat_GlobalStats
TimestampTz stat_reset_timestamp;
} PgStat_GlobalStats;
/*
* WAL statistics kept in the stats collector
*/
typedef struct PgStat_WalStats
{
PgStat_Counter wal_buffers_full;
TimestampTz stat_reset_timestamp;
} PgStat_WalStats;
/*
* SLRU statistics kept in the stats collector
*/
@ -1265,6 +1287,11 @@ extern char *pgstat_stat_filename;
*/
extern PgStat_MsgBgWriter BgWriterStats;
/*
* WAL statistics counter is updated by backends and background processes
*/
extern PgStat_MsgWal WalStats;
/*
* Updated by pgstat_count_buffer_*_time macros
*/
@ -1464,6 +1491,7 @@ extern void pgstat_twophase_postabort(TransactionId xid, uint16 info,
extern void pgstat_send_archiver(const char *xlog, bool failed);
extern void pgstat_send_bgwriter(void);
extern void pgstat_send_wal(void);
/* ----------
* Support functions for the SQL-callable functions to
@ -1478,6 +1506,7 @@ 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);
extern PgStat_WalStats *pgstat_fetch_stat_wal(void);
extern PgStat_SLRUStats *pgstat_fetch_slru(void);
extern void pgstat_count_slru_page_zeroed(int slru_idx);