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/* ----------
* pgstat.h
*
* Definitions for the PostgreSQL cumulative statistics system.
*
* Copyright (c) 2001-2023, PostgreSQL Global Development Group
*
* src/include/pgstat.h
* ----------
*/
#ifndef PGSTAT_H
#define PGSTAT_H
#include "datatype/timestamp.h"
#include "portability/instr_time.h"
#include "postmaster/pgarch.h" /* for MAX_XFN_CHARS */
#include "utils/backend_progress.h" /* for backward compatibility */
#include "utils/backend_status.h" /* for backward compatibility */
#include "utils/relcache.h"
#include "utils/wait_event.h" /* for backward compatibility */
/* ----------
* Paths for the statistics files (relative to installation's $PGDATA).
* ----------
*/
#define PGSTAT_STAT_PERMANENT_DIRECTORY "pg_stat"
#define PGSTAT_STAT_PERMANENT_FILENAME "pg_stat/pgstat.stat"
#define PGSTAT_STAT_PERMANENT_TMPFILE "pg_stat/pgstat.tmp"
/* Default directory to store temporary statistics data in */
#define PG_STAT_TMP_DIR "pg_stat_tmp"
/* The types of statistics entries */
typedef enum PgStat_Kind
{
/* use 0 for INVALID, to catch zero-initialized data */
PGSTAT_KIND_INVALID = 0,
/* stats for variable-numbered objects */
PGSTAT_KIND_DATABASE, /* database-wide statistics */
PGSTAT_KIND_RELATION, /* per-table statistics */
PGSTAT_KIND_FUNCTION, /* per-function statistics */
PGSTAT_KIND_REPLSLOT, /* per-slot statistics */
PGSTAT_KIND_SUBSCRIPTION, /* per-subscription statistics */
/* stats for fixed-numbered objects */
PGSTAT_KIND_ARCHIVER,
PGSTAT_KIND_BGWRITER,
PGSTAT_KIND_CHECKPOINTER,
PGSTAT_KIND_IO,
PGSTAT_KIND_SLRU,
PGSTAT_KIND_WAL,
} PgStat_Kind;
#define PGSTAT_KIND_FIRST_VALID PGSTAT_KIND_DATABASE
#define PGSTAT_KIND_LAST PGSTAT_KIND_WAL
#define PGSTAT_NUM_KINDS (PGSTAT_KIND_LAST + 1)
/* Values for track_functions GUC variable --- order is significant! */
typedef enum TrackFunctionsLevel
{
TRACK_FUNC_OFF,
TRACK_FUNC_PL,
TRACK_FUNC_ALL
} TrackFunctionsLevel;
typedef enum PgStat_FetchConsistency
{
PGSTAT_FETCH_CONSISTENCY_NONE,
PGSTAT_FETCH_CONSISTENCY_CACHE,
PGSTAT_FETCH_CONSISTENCY_SNAPSHOT,
} PgStat_FetchConsistency;
/* Values to track the cause of session termination */
typedef enum SessionEndType
{
DISCONNECT_NOT_YET, /* still active */
DISCONNECT_NORMAL,
DISCONNECT_CLIENT_EOF,
DISCONNECT_FATAL,
DISCONNECT_KILLED
} SessionEndType;
/* ----------
* The data type used for counters.
* ----------
*/
typedef int64 PgStat_Counter;
/* ------------------------------------------------------------
* Structures kept in backend local memory while accumulating counts
* ------------------------------------------------------------
*/
/* ----------
* PgStat_FunctionCounts The actual per-function counts kept by a backend
*
* This struct should contain only actual event counters, because we memcmp
* it against zeroes to detect whether there are any pending stats.
*
* Note that the time counters are in instr_time format here. We convert to
* microseconds in PgStat_Counter format when flushing out pending statistics.
* ----------
*/
typedef struct PgStat_FunctionCounts
{
PgStat_Counter numcalls;
instr_time total_time;
instr_time self_time;
} PgStat_FunctionCounts;
/*
* Working state needed to accumulate per-function-call timing statistics.
*/
typedef struct PgStat_FunctionCallUsage
{
/* Link to function's hashtable entry (must still be there at exit!) */
/* NULL means we are not tracking the current function call */
PgStat_FunctionCounts *fs;
/* Total time previously charged to function, as of function start */
instr_time save_f_total_time;
/* Backend-wide total time as of function start */
instr_time save_total;
/* system clock as of function start */
instr_time start;
} PgStat_FunctionCallUsage;
/* ----------
* PgStat_BackendSubEntry Non-flushed subscription stats.
* ----------
*/
typedef struct PgStat_BackendSubEntry
{
PgStat_Counter apply_error_count;
PgStat_Counter sync_error_count;
} PgStat_BackendSubEntry;
/* ----------
* PgStat_TableCounts The actual per-table counts kept by a backend
*
* This struct should contain only actual event counters, because we memcmp
* it against zeroes to detect whether there are any stats updates to apply.
* It is a component of PgStat_TableStatus (within-backend state).
*
* Note: for a table, tuples_returned is the number of tuples successfully
* fetched by heap_getnext, while tuples_fetched is the number of tuples
* successfully fetched by heap_fetch under the control of bitmap indexscans.
* For an index, tuples_returned is the number of index entries returned by
* the index AM, while tuples_fetched is the number of tuples successfully
* fetched by heap_fetch under the control of simple indexscans for this index.
*
* tuples_inserted/updated/deleted/hot_updated/newpage_updated count attempted
* actions, regardless of whether the transaction committed. delta_live_tuples,
* delta_dead_tuples, and changed_tuples are set depending on commit or abort.
* Note that delta_live_tuples and delta_dead_tuples can be negative!
* ----------
*/
typedef struct PgStat_TableCounts
{
PgStat_Counter numscans;
PgStat_Counter tuples_returned;
PgStat_Counter tuples_fetched;
PgStat_Counter tuples_inserted;
PgStat_Counter tuples_updated;
PgStat_Counter tuples_deleted;
PgStat_Counter tuples_hot_updated;
PgStat_Counter tuples_newpage_updated;
bool truncdropped;
PgStat_Counter delta_live_tuples;
PgStat_Counter delta_dead_tuples;
PgStat_Counter changed_tuples;
PgStat_Counter blocks_fetched;
PgStat_Counter blocks_hit;
} PgStat_TableCounts;
/* ----------
* PgStat_TableStatus Per-table status within a backend
*
* Many of the event counters are nontransactional, ie, we count events
* in committed and aborted transactions alike. For these, we just count
* directly in the PgStat_TableStatus. However, delta_live_tuples,
* delta_dead_tuples, and changed_tuples must be derived from event counts
* with awareness of whether the transaction or subtransaction committed or
* aborted. Hence, we also keep a stack of per-(sub)transaction status
* records for every table modified in the current transaction. At commit
* or abort, we propagate tuples_inserted/updated/deleted up to the
* parent subtransaction level, or out to the parent PgStat_TableStatus,
* as appropriate.
* ----------
*/
typedef struct PgStat_TableStatus
{
Oid id; /* table's OID */
bool shared; /* is it a shared catalog? */
struct PgStat_TableXactStatus *trans; /* lowest subxact's counts */
PgStat_TableCounts counts; /* event counts to be sent */
Relation relation; /* rel that is using this entry */
} PgStat_TableStatus;
/* ----------
* PgStat_TableXactStatus Per-table, per-subtransaction status
* ----------
*/
typedef struct PgStat_TableXactStatus
{
PgStat_Counter tuples_inserted; /* tuples inserted in (sub)xact */
PgStat_Counter tuples_updated; /* tuples updated in (sub)xact */
PgStat_Counter tuples_deleted; /* tuples deleted in (sub)xact */
bool truncdropped; /* relation truncated/dropped in this
* (sub)xact */
/* tuples i/u/d prior to truncate/drop */
PgStat_Counter inserted_pre_truncdrop;
PgStat_Counter updated_pre_truncdrop;
PgStat_Counter deleted_pre_truncdrop;
int nest_level; /* subtransaction nest level */
/* links to other structs for same relation: */
struct PgStat_TableXactStatus *upper; /* next higher subxact if any */
PgStat_TableStatus *parent; /* per-table status */
/* structs of same subxact level are linked here: */
struct PgStat_TableXactStatus *next; /* next of same subxact */
} PgStat_TableXactStatus;
/* ------------------------------------------------------------
* Data structures on disk and in shared memory follow
*
* PGSTAT_FILE_FORMAT_ID should be changed whenever any of these
* data structures change.
* ------------------------------------------------------------
*/
#define PGSTAT_FILE_FORMAT_ID 0x01A5BCAC
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;
typedef struct PgStat_BgWriterStats
{
PgStat_Counter buf_written_clean;
PgStat_Counter maxwritten_clean;
PgStat_Counter buf_alloc;
TimestampTz stat_reset_timestamp;
} PgStat_BgWriterStats;
typedef struct PgStat_CheckpointerStats
{
PgStat_Counter timed_checkpoints;
PgStat_Counter requested_checkpoints;
PgStat_Counter checkpoint_write_time; /* times in milliseconds */
PgStat_Counter checkpoint_sync_time;
PgStat_Counter buf_written_checkpoints;
PgStat_Counter buf_written_backend;
PgStat_Counter buf_fsync_backend;
} PgStat_CheckpointerStats;
/*
* Types related to counting IO operations
*/
typedef enum IOObject
{
IOOBJECT_RELATION,
IOOBJECT_TEMP_RELATION,
} IOObject;
#define IOOBJECT_NUM_TYPES (IOOBJECT_TEMP_RELATION + 1)
typedef enum IOContext
{
IOCONTEXT_BULKREAD,
IOCONTEXT_BULKWRITE,
IOCONTEXT_NORMAL,
IOCONTEXT_VACUUM,
} IOContext;
#define IOCONTEXT_NUM_TYPES (IOCONTEXT_VACUUM + 1)
typedef enum IOOp
{
IOOP_EVICT,
IOOP_EXTEND,
IOOP_FSYNC,
IOOP_HIT,
IOOP_READ,
IOOP_REUSE,
IOOP_WRITE,
IOOP_WRITEBACK,
} IOOp;
#define IOOP_NUM_TYPES (IOOP_WRITEBACK + 1)
typedef struct PgStat_BktypeIO
{
PgStat_Counter counts[IOOBJECT_NUM_TYPES][IOCONTEXT_NUM_TYPES][IOOP_NUM_TYPES];
PgStat_Counter times[IOOBJECT_NUM_TYPES][IOCONTEXT_NUM_TYPES][IOOP_NUM_TYPES];
} PgStat_BktypeIO;
typedef struct PgStat_IO
{
TimestampTz stat_reset_timestamp;
PgStat_BktypeIO stats[BACKEND_NUM_TYPES];
} PgStat_IO;
typedef struct PgStat_StatDBEntry
{
PgStat_Counter xact_commit;
PgStat_Counter xact_rollback;
PgStat_Counter blocks_fetched;
PgStat_Counter blocks_hit;
PgStat_Counter tuples_returned;
PgStat_Counter tuples_fetched;
PgStat_Counter tuples_inserted;
PgStat_Counter tuples_updated;
PgStat_Counter tuples_deleted;
TimestampTz last_autovac_time;
PgStat_Counter conflict_tablespace;
PgStat_Counter conflict_lock;
PgStat_Counter conflict_snapshot;
PgStat_Counter conflict_logicalslot;
PgStat_Counter conflict_bufferpin;
PgStat_Counter conflict_startup_deadlock;
PgStat_Counter temp_files;
PgStat_Counter temp_bytes;
PgStat_Counter deadlocks;
PgStat_Counter checksum_failures;
TimestampTz last_checksum_failure;
PgStat_Counter blk_read_time; /* times in microseconds */
PgStat_Counter blk_write_time;
PgStat_Counter sessions;
PgStat_Counter session_time;
PgStat_Counter active_time;
PgStat_Counter idle_in_transaction_time;
PgStat_Counter sessions_abandoned;
PgStat_Counter sessions_fatal;
PgStat_Counter sessions_killed;
TimestampTz stat_reset_timestamp;
} PgStat_StatDBEntry;
typedef struct PgStat_StatFuncEntry
{
PgStat_Counter numcalls;
PgStat_Counter total_time; /* times in microseconds */
PgStat_Counter self_time;
} PgStat_StatFuncEntry;
typedef struct PgStat_StatReplSlotEntry
{
PgStat_Counter spill_txns;
PgStat_Counter spill_count;
PgStat_Counter spill_bytes;
PgStat_Counter stream_txns;
PgStat_Counter stream_count;
PgStat_Counter stream_bytes;
PgStat_Counter total_txns;
PgStat_Counter total_bytes;
TimestampTz stat_reset_timestamp;
} PgStat_StatReplSlotEntry;
typedef struct PgStat_SLRUStats
{
PgStat_Counter blocks_zeroed;
PgStat_Counter blocks_hit;
PgStat_Counter blocks_read;
PgStat_Counter blocks_written;
PgStat_Counter blocks_exists;
PgStat_Counter flush;
PgStat_Counter truncate;
TimestampTz stat_reset_timestamp;
} PgStat_SLRUStats;
typedef struct PgStat_StatSubEntry
{
PgStat_Counter apply_error_count;
PgStat_Counter sync_error_count;
TimestampTz stat_reset_timestamp;
} PgStat_StatSubEntry;
typedef struct PgStat_StatTabEntry
{
PgStat_Counter numscans;
TimestampTz lastscan;
PgStat_Counter tuples_returned;
PgStat_Counter tuples_fetched;
PgStat_Counter tuples_inserted;
PgStat_Counter tuples_updated;
PgStat_Counter tuples_deleted;
PgStat_Counter tuples_hot_updated;
PgStat_Counter tuples_newpage_updated;
PgStat_Counter live_tuples;
PgStat_Counter dead_tuples;
PgStat_Counter mod_since_analyze;
PgStat_Counter ins_since_vacuum;
PgStat_Counter blocks_fetched;
PgStat_Counter blocks_hit;
TimestampTz last_vacuum_time; /* user initiated vacuum */
PgStat_Counter vacuum_count;
TimestampTz last_autovacuum_time; /* autovacuum initiated */
PgStat_Counter autovacuum_count;
TimestampTz last_analyze_time; /* user initiated */
PgStat_Counter analyze_count;
TimestampTz last_autoanalyze_time; /* autovacuum initiated */
PgStat_Counter autoanalyze_count;
} PgStat_StatTabEntry;
typedef struct PgStat_WalStats
{
PgStat_Counter wal_records;
PgStat_Counter wal_fpi;
uint64 wal_bytes;
PgStat_Counter wal_buffers_full;
PgStat_Counter wal_write;
PgStat_Counter wal_sync;
PgStat_Counter wal_write_time;
PgStat_Counter wal_sync_time;
TimestampTz stat_reset_timestamp;
} PgStat_WalStats;
/*
* This struct stores wal-related durations as instr_time, which makes it
* cheaper and easier to accumulate them, by not requiring type
* conversions. During stats flush instr_time will be converted into
* microseconds.
*/
typedef struct PgStat_PendingWalStats
{
PgStat_Counter wal_buffers_full;
PgStat_Counter wal_write;
PgStat_Counter wal_sync;
instr_time wal_write_time;
instr_time wal_sync_time;
} PgStat_PendingWalStats;
/*
* Functions in pgstat.c
*/
/* functions called from postmaster */
extern Size StatsShmemSize(void);
extern void StatsShmemInit(void);
/* Functions called during server startup / shutdown */
extern void pgstat_restore_stats(void);
extern void pgstat_discard_stats(void);
extern void pgstat_before_server_shutdown(int code, Datum arg);
/* Functions for backend initialization */
extern void pgstat_initialize(void);
/* Functions called from backends */
extern long pgstat_report_stat(bool force);
extern void pgstat_force_next_flush(void);
extern void pgstat_reset_counters(void);
extern void pgstat_reset(PgStat_Kind kind, Oid dboid, Oid objoid);
extern void pgstat_reset_of_kind(PgStat_Kind kind);
/* stats accessors */
extern void pgstat_clear_snapshot(void);
extern TimestampTz pgstat_get_stat_snapshot_timestamp(bool *have_snapshot);
/* helpers */
extern PgStat_Kind pgstat_get_kind_from_str(char *kind_str);
extern bool pgstat_have_entry(PgStat_Kind kind, Oid dboid, Oid objoid);
/*
* Functions in pgstat_archiver.c
*/
extern void pgstat_report_archiver(const char *xlog, bool failed);
extern PgStat_ArchiverStats *pgstat_fetch_stat_archiver(void);
/*
* Functions in pgstat_bgwriter.c
*/
extern void pgstat_report_bgwriter(void);
extern PgStat_BgWriterStats *pgstat_fetch_stat_bgwriter(void);
/*
* Functions in pgstat_checkpointer.c
*/
extern void pgstat_report_checkpointer(void);
extern PgStat_CheckpointerStats *pgstat_fetch_stat_checkpointer(void);
/*
* Functions in pgstat_io.c
*/
extern bool pgstat_bktype_io_stats_valid(PgStat_BktypeIO *backend_io,
BackendType bktype);
extern void pgstat_count_io_op(IOObject io_object, IOContext io_context, IOOp io_op);
extern void pgstat_count_io_op_n(IOObject io_object, IOContext io_context, IOOp io_op, uint32 cnt);
extern instr_time pgstat_prepare_io_time(void);
extern void pgstat_count_io_op_time(IOObject io_object, IOContext io_context,
IOOp io_op, instr_time start_time, uint32 cnt);
extern PgStat_IO *pgstat_fetch_stat_io(void);
extern const char *pgstat_get_io_context_name(IOContext io_context);
extern const char *pgstat_get_io_object_name(IOObject io_object);
extern bool pgstat_tracks_io_bktype(BackendType bktype);
extern bool pgstat_tracks_io_object(BackendType bktype,
IOObject io_object, IOContext io_context);
extern bool pgstat_tracks_io_op(BackendType bktype, IOObject io_object,
IOContext io_context, IOOp io_op);
/*
* Functions in pgstat_database.c
*/
extern void pgstat_drop_database(Oid databaseid);
extern void pgstat_report_autovac(Oid dboid);
extern void pgstat_report_recovery_conflict(int reason);
extern void pgstat_report_deadlock(void);
extern void pgstat_report_checksum_failures_in_db(Oid dboid, int failurecount);
extern void pgstat_report_checksum_failure(void);
extern void pgstat_report_connect(Oid dboid);
#define pgstat_count_buffer_read_time(n) \
(pgStatBlockReadTime += (n))
#define pgstat_count_buffer_write_time(n) \
(pgStatBlockWriteTime += (n))
#define pgstat_count_conn_active_time(n) \
(pgStatActiveTime += (n))
#define pgstat_count_conn_txn_idle_time(n) \
(pgStatTransactionIdleTime += (n))
extern PgStat_StatDBEntry *pgstat_fetch_stat_dbentry(Oid dboid);
/*
* Functions in pgstat_function.c
*/
extern void pgstat_create_function(Oid proid);
extern void pgstat_drop_function(Oid proid);
struct FunctionCallInfoBaseData;
extern void pgstat_init_function_usage(struct FunctionCallInfoBaseData *fcinfo,
PgStat_FunctionCallUsage *fcu);
extern void pgstat_end_function_usage(PgStat_FunctionCallUsage *fcu,
bool finalize);
extern PgStat_StatFuncEntry *pgstat_fetch_stat_funcentry(Oid func_id);
extern PgStat_FunctionCounts *find_funcstat_entry(Oid func_id);
/*
* Functions in pgstat_relation.c
*/
extern void pgstat_create_relation(Relation rel);
extern void pgstat_drop_relation(Relation rel);
extern void pgstat_copy_relation_stats(Relation dst, Relation src);
extern void pgstat_init_relation(Relation rel);
extern void pgstat_assoc_relation(Relation rel);
extern void pgstat_unlink_relation(Relation rel);
extern void pgstat_report_vacuum(Oid tableoid, bool shared,
PgStat_Counter livetuples, PgStat_Counter deadtuples);
extern void pgstat_report_analyze(Relation rel,
PgStat_Counter livetuples, PgStat_Counter deadtuples,
bool resetcounter);
/*
* If stats are enabled, but pending data hasn't been prepared yet, call
* pgstat_assoc_relation() to do so. See its comment for why this is done
* separately from pgstat_init_relation().
*/
#define pgstat_should_count_relation(rel) \
(likely((rel)->pgstat_info != NULL) ? true : \
((rel)->pgstat_enabled ? pgstat_assoc_relation(rel), true : false))
/* nontransactional event counts are simple enough to inline */
#define pgstat_count_heap_scan(rel) \
do { \
if (pgstat_should_count_relation(rel)) \
(rel)->pgstat_info->counts.numscans++; \
} while (0)
#define pgstat_count_heap_getnext(rel) \
do { \
if (pgstat_should_count_relation(rel)) \
(rel)->pgstat_info->counts.tuples_returned++; \
} while (0)
#define pgstat_count_heap_fetch(rel) \
do { \
if (pgstat_should_count_relation(rel)) \
(rel)->pgstat_info->counts.tuples_fetched++; \
} while (0)
#define pgstat_count_index_scan(rel) \
do { \
if (pgstat_should_count_relation(rel)) \
(rel)->pgstat_info->counts.numscans++; \
} while (0)
#define pgstat_count_index_tuples(rel, n) \
do { \
if (pgstat_should_count_relation(rel)) \
(rel)->pgstat_info->counts.tuples_returned += (n); \
} while (0)
#define pgstat_count_buffer_read(rel) \
do { \
if (pgstat_should_count_relation(rel)) \
(rel)->pgstat_info->counts.blocks_fetched++; \
} while (0)
#define pgstat_count_buffer_hit(rel) \
do { \
if (pgstat_should_count_relation(rel)) \
(rel)->pgstat_info->counts.blocks_hit++; \
} while (0)
extern void pgstat_count_heap_insert(Relation rel, PgStat_Counter n);
extern void pgstat_count_heap_update(Relation rel, bool hot, bool newpage);
extern void pgstat_count_heap_delete(Relation rel);
extern void pgstat_count_truncate(Relation rel);
extern void pgstat_update_heap_dead_tuples(Relation rel, int delta);
extern void pgstat_twophase_postcommit(TransactionId xid, uint16 info,
void *recdata, uint32 len);
extern void pgstat_twophase_postabort(TransactionId xid, uint16 info,
void *recdata, uint32 len);
extern PgStat_StatTabEntry *pgstat_fetch_stat_tabentry(Oid relid);
extern PgStat_StatTabEntry *pgstat_fetch_stat_tabentry_ext(bool shared,
Oid reloid);
extern PgStat_TableStatus *find_tabstat_entry(Oid rel_id);
/*
* Functions in pgstat_replslot.c
*/
extern void pgstat_reset_replslot(const char *name);
struct ReplicationSlot;
extern void pgstat_report_replslot(struct ReplicationSlot *slot, const PgStat_StatReplSlotEntry *repSlotStat);
extern void pgstat_create_replslot(struct ReplicationSlot *slot);
extern void pgstat_acquire_replslot(struct ReplicationSlot *slot);
extern void pgstat_drop_replslot(struct ReplicationSlot *slot);
extern PgStat_StatReplSlotEntry *pgstat_fetch_replslot(NameData slotname);
/*
* Functions in pgstat_slru.c
*/
extern void pgstat_reset_slru(const char *);
extern void pgstat_count_slru_page_zeroed(int slru_idx);
extern void pgstat_count_slru_page_hit(int slru_idx);
extern void pgstat_count_slru_page_read(int slru_idx);
extern void pgstat_count_slru_page_written(int slru_idx);
extern void pgstat_count_slru_page_exists(int slru_idx);
extern void pgstat_count_slru_flush(int slru_idx);
extern void pgstat_count_slru_truncate(int slru_idx);
extern const char *pgstat_get_slru_name(int slru_idx);
extern int pgstat_get_slru_index(const char *name);
extern PgStat_SLRUStats *pgstat_fetch_slru(void);
/*
* Functions in pgstat_subscription.c
*/
extern void pgstat_report_subscription_error(Oid subid, bool is_apply_error);
extern void pgstat_create_subscription(Oid subid);
extern void pgstat_drop_subscription(Oid subid);
extern PgStat_StatSubEntry *pgstat_fetch_stat_subscription(Oid subid);
/*
* Functions in pgstat_xact.c
*/
extern void AtEOXact_PgStat(bool isCommit, bool parallel);
extern void AtEOSubXact_PgStat(bool isCommit, int nestDepth);
extern void AtPrepare_PgStat(void);
extern void PostPrepare_PgStat(void);
struct xl_xact_stats_item;
extern int pgstat_get_transactional_drops(bool isCommit, struct xl_xact_stats_item **items);
extern void pgstat_execute_transactional_drops(int ndrops, struct xl_xact_stats_item *items, bool is_redo);
/*
* Functions in pgstat_wal.c
*/
extern void pgstat_report_wal(bool force);
extern PgStat_WalStats *pgstat_fetch_stat_wal(void);
/*
* Variables in pgstat.c
*/
/* GUC parameters */
extern PGDLLIMPORT bool pgstat_track_counts;
extern PGDLLIMPORT int pgstat_track_functions;
extern PGDLLIMPORT int pgstat_fetch_consistency;
/*
* Variables in pgstat_bgwriter.c
*/
/* updated directly by bgwriter and bufmgr */
extern PGDLLIMPORT PgStat_BgWriterStats PendingBgWriterStats;
/*
* Variables in pgstat_checkpointer.c
*/
/*
* Checkpointer statistics counters are updated directly by checkpointer and
* bufmgr.
*/
extern PGDLLIMPORT PgStat_CheckpointerStats PendingCheckpointerStats;
/*
* Variables in pgstat_database.c
*/
/* Updated by pgstat_count_buffer_*_time macros */
extern PGDLLIMPORT PgStat_Counter pgStatBlockReadTime;
extern PGDLLIMPORT PgStat_Counter pgStatBlockWriteTime;
/*
* Updated by pgstat_count_conn_*_time macros, called by
* pgstat_report_activity().
*/
extern PGDLLIMPORT PgStat_Counter pgStatActiveTime;
extern PGDLLIMPORT PgStat_Counter pgStatTransactionIdleTime;
/* updated by the traffic cop and in errfinish() */
extern PGDLLIMPORT SessionEndType pgStatSessionEndCause;
/*
* Variables in pgstat_wal.c
*/
/* updated directly by backends and background processes */
extern PGDLLIMPORT PgStat_PendingWalStats PendingWalStats;
#endif /* PGSTAT_H */