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/* ----------
* pgstat_internal.h
*
* Definitions for the PostgreSQL cumulative statistics system that should
* only be needed by files implementing statistics support (rather than ones
* reporting / querying stats).
*
* Copyright (c) 2001-2022, PostgreSQL Global Development Group
*
* src/include/utils/pgstat_internal.h
* ----------
*/
#ifndef PGSTAT_INTERNAL_H
#define PGSTAT_INTERNAL_H
#include "pgstat.h"
#define PGSTAT_STAT_INTERVAL 500 /* Minimum time between stats file
* updates; in milliseconds. */
/* ----------
* The initial size hints for the hash tables used in the collector.
* ----------
*/
#define PGSTAT_DB_HASH_SIZE 16
#define PGSTAT_TAB_HASH_SIZE 512
#define PGSTAT_FUNCTION_HASH_SIZE 512
#define PGSTAT_SUBSCRIPTION_HASH_SIZE 32
#define PGSTAT_REPLSLOT_HASH_SIZE 32
/*
* Some stats changes are transactional. To maintain those, a stack of
* PgStat_SubXactStatus entries is maintained, which contain data pertaining
* to the current transaction and its active subtransactions.
*/
typedef struct PgStat_SubXactStatus
{
int nest_level; /* subtransaction nest level */
struct PgStat_SubXactStatus *prev; /* higher-level subxact if any */
/*
* Tuple insertion/deletion counts for an open transaction can't be
* propagated into PgStat_TableStatus counters until we know if it is
* going to commit or abort. Hence, we keep these counts in per-subxact
* structs that live in TopTransactionContext. This data structure is
* designed on the assumption that subxacts won't usually modify very many
* tables.
*/
PgStat_TableXactStatus *first; /* head of list for this subxact */
} PgStat_SubXactStatus;
/*
* List of SLRU names that we keep stats for. There is no central registry of
* SLRUs, so we use this fixed list instead. The "other" entry is used for
* all SLRUs without an explicit entry (e.g. SLRUs in extensions).
*/
static const char *const slru_names[] = {
"CommitTs",
"MultiXactMember",
"MultiXactOffset",
"Notify",
"Serial",
"Subtrans",
"Xact",
"other" /* has to be last */
};
#define SLRU_NUM_ELEMENTS lengthof(slru_names)
/*
* Functions in pgstat.c
*/
extern void pgstat_setheader(PgStat_MsgHdr *hdr, StatMsgType mtype);
extern void pgstat_send(void *msg, int len);
#ifdef USE_ASSERT_CHECKING
extern void pgstat_assert_is_up(void);
#else
#define pgstat_assert_is_up() ((void)true)
#endif
/*
* Functions in pgstat_database.c
*/
extern void AtEOXact_PgStat_Database(bool isCommit, bool parallel);
extern void pgstat_report_disconnect(Oid dboid);
extern void pgstat_update_dbstats(PgStat_MsgTabstat *tsmsg, TimestampTz now);
/*
* Functions in pgstat_function.c
*/
extern void pgstat_send_funcstats(void);
/*
* Functions in pgstat_relation.c
*/
extern void AtEOXact_PgStat_Relations(PgStat_SubXactStatus *xact_state, bool isCommit);
extern void AtEOSubXact_PgStat_Relations(PgStat_SubXactStatus *xact_state, bool isCommit, int nestDepth);
extern void AtPrepare_PgStat_Relations(PgStat_SubXactStatus *xact_state);
extern void PostPrepare_PgStat_Relations(PgStat_SubXactStatus *xact_state);
extern void pgstat_send_tabstats(TimestampTz now, bool disconnect);
/*
* Functions in pgstat_slru.c
*/
extern void pgstat_send_slru(void);
/*
* Functions in pgstat_wal.c
*/
extern void pgstat_wal_initialize(void);
extern bool pgstat_wal_pending(void);
/*
* Functions in pgstat_xact.c
*/
extern PgStat_SubXactStatus *pgstat_xact_stack_level_get(int nest_level);
/*
* Variables in pgstat.c
*/
extern pgsocket pgStatSock;
/*
* Variables in pgstat_database.c
*/
extern int pgStatXactCommit;
extern int pgStatXactRollback;
/*
* Variables in pgstat_functions.c
*/
extern bool have_function_stats;
/*
* Variables in pgstat_relation.c
*/
extern bool have_relation_stats;
#endif /* PGSTAT_INTERNAL_H */
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