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Add views and functions to monitor hot standby query conflicts

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Add the view pg_stat_database_conflicts and a column to pg_stat_database,
and the underlying functions to provide the information.
This commit is contained in:
Magnus Hagander
2011-01-03 12:46:03 +01:00
parent 1996b48285
commit 40d9e94bd7
9 changed files with 287 additions and 5 deletions
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23
src/include/pgstat.h
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@ -45,7 +45,8 @@ typedef enum StatMsgType
PGSTAT_MTYPE_ANALYZE,
PGSTAT_MTYPE_BGWRITER,
PGSTAT_MTYPE_FUNCSTAT,
PGSTAT_MTYPE_FUNCPURGE
PGSTAT_MTYPE_FUNCPURGE,
PGSTAT_MTYPE_RECOVERYCONFLICT
} StatMsgType;
/* ----------
@ -364,6 +365,17 @@ typedef struct PgStat_MsgBgWriter
PgStat_Counter m_buf_alloc;
} PgStat_MsgBgWriter;
/* ----------
* PgStat_MsgRecoveryConflict Sent by the backend upon recovery conflict
* ----------
*/
typedef struct PgStat_MsgRecoveryConflict
{
PgStat_MsgHdr m_hdr;
Oid m_databaseid;
int m_reason;
} PgStat_MsgRecoveryConflict;
/* ----------
* PgStat_FunctionCounts The actual per-function counts kept by a backend
@ -460,6 +472,7 @@ typedef union PgStat_Msg
PgStat_MsgBgWriter msg_bgwriter;
PgStat_MsgFuncstat msg_funcstat;
PgStat_MsgFuncpurge msg_funcpurge;
PgStat_MsgRecoveryConflict msg_recoveryconflict;
} PgStat_Msg;
@ -490,6 +503,12 @@ typedef struct PgStat_StatDBEntry
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;
/*
* tables and functions must be last in the struct, because we don't write
@ -689,6 +708,8 @@ extern void pgstat_report_vacuum(Oid tableoid, bool shared, bool adopt_counts,
extern void pgstat_report_analyze(Relation rel, bool adopt_counts,
PgStat_Counter livetuples, PgStat_Counter deadtuples);
extern void pgstat_report_recovery_conflict(int reason);
extern void pgstat_initialize(void);
extern void pgstat_bestart(void);