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PostgreSQL/src/include/pgstat.h
Amit Kapila 7a85073290 Reconsider pg_stat_subscription_workers view. 
It was decided (refer to the Discussion link below) that the stats
collector is not an appropriate place to store the error information of
subscription workers.

This patch changes the pg_stat_subscription_workers view (introduced by
commit 8d74fc96db) so that it stores only statistics counters:
apply_error_count and sync_error_count, and has one entry for
each subscription. The removed error information such as error-XID and
the error message would be stored in another way in the future which is
more reliable and persistent.

After removing these error details, there is no longer any relation
information, so the subscription statistics are now a cluster-wide
statistics.

The patch also changes the view name to pg_stat_subscription_stats since
the word "worker" is an implementation detail that we use one worker for
one tablesync and one apply.

Author: Masahiko Sawada, based on suggestions by Andres Freund
Reviewed-by: Peter Smith, Haiying Tang, Takamichi Osumi, Amit Kapila
Discussion: https://postgr.es/m/20220125063131.4cmvsxbz2tdg6g65@alap3.anarazel.de
2022-03-01 06:17:52 +05:30

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/* ----------
* pgstat.h
*
* Definitions for the PostgreSQL statistics collector daemon.
*
* Copyright (c) 2001-2022, 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 "replication/logicalproto.h"
#include "utils/backend_progress.h" /* for backward compatibility */
#include "utils/backend_status.h" /* for backward compatibility */
#include "utils/hsearch.h"
#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/global.stat"
#define PGSTAT_STAT_PERMANENT_TMPFILE "pg_stat/global.tmp"
/* Default directory to store temporary statistics data in */
#define PG_STAT_TMP_DIR "pg_stat_tmp"
/* Values for track_functions GUC variable --- order is significant! */
typedef enum TrackFunctionsLevel
{
TRACK_FUNC_OFF,
TRACK_FUNC_PL,
TRACK_FUNC_ALL
} TrackFunctionsLevel;
/* 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 types of backend -> collector messages
* ----------
*/
typedef enum StatMsgType
{
PGSTAT_MTYPE_DUMMY,
PGSTAT_MTYPE_INQUIRY,
PGSTAT_MTYPE_TABSTAT,
PGSTAT_MTYPE_TABPURGE,
PGSTAT_MTYPE_DROPDB,
PGSTAT_MTYPE_RESETCOUNTER,
PGSTAT_MTYPE_RESETSHAREDCOUNTER,
PGSTAT_MTYPE_RESETSINGLECOUNTER,
PGSTAT_MTYPE_RESETSLRUCOUNTER,
PGSTAT_MTYPE_RESETREPLSLOTCOUNTER,
PGSTAT_MTYPE_RESETSUBCOUNTER,
PGSTAT_MTYPE_AUTOVAC_START,
PGSTAT_MTYPE_VACUUM,
PGSTAT_MTYPE_ANALYZE,
PGSTAT_MTYPE_ARCHIVER,
PGSTAT_MTYPE_BGWRITER,
PGSTAT_MTYPE_CHECKPOINTER,
PGSTAT_MTYPE_WAL,
PGSTAT_MTYPE_SLRU,
PGSTAT_MTYPE_FUNCSTAT,
PGSTAT_MTYPE_FUNCPURGE,
PGSTAT_MTYPE_RECOVERYCONFLICT,
PGSTAT_MTYPE_TEMPFILE,
PGSTAT_MTYPE_DEADLOCK,
PGSTAT_MTYPE_CHECKSUMFAILURE,
PGSTAT_MTYPE_REPLSLOT,
PGSTAT_MTYPE_CONNECT,
PGSTAT_MTYPE_DISCONNECT,
PGSTAT_MTYPE_SUBSCRIPTIONDROP,
PGSTAT_MTYPE_SUBSCRIPTIONERROR,
} StatMsgType;
/* ----------
* The data type used for counters.
* ----------
*/
typedef int64 PgStat_Counter;
/* ----------
* 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 counts to transmit.
* It is a component of PgStat_TableStatus (within-backend state) and
* PgStat_TableEntry (the transmitted message format).
*
* 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 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 t_numscans;
PgStat_Counter t_tuples_returned;
PgStat_Counter t_tuples_fetched;
PgStat_Counter t_tuples_inserted;
PgStat_Counter t_tuples_updated;
PgStat_Counter t_tuples_deleted;
PgStat_Counter t_tuples_hot_updated;
bool t_truncdropped;
PgStat_Counter t_delta_live_tuples;
PgStat_Counter t_delta_dead_tuples;
PgStat_Counter t_changed_tuples;
PgStat_Counter t_blocks_fetched;
PgStat_Counter t_blocks_hit;
} PgStat_TableCounts;
/* Possible targets for resetting cluster-wide shared values */
typedef enum PgStat_Shared_Reset_Target
{
RESET_ARCHIVER,
RESET_BGWRITER,
RESET_WAL
} PgStat_Shared_Reset_Target;
/* Possible object types for resetting single counters */
typedef enum PgStat_Single_Reset_Type
{
RESET_TABLE,
RESET_FUNCTION
} PgStat_Single_Reset_Type;
/* ------------------------------------------------------------
* Structures kept in backend local memory while accumulating counts
* ------------------------------------------------------------
*/
/* ----------
* 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 t_id; /* table's OID */
bool t_shared; /* is it a shared catalog? */
struct PgStat_TableXactStatus *trans; /* lowest subxact's counts */
PgStat_TableCounts t_counts; /* event counts to be sent */
} 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;
/* ------------------------------------------------------------
* Message formats follow
* ------------------------------------------------------------
*/
/* ----------
* PgStat_MsgHdr The common message header
* ----------
*/
typedef struct PgStat_MsgHdr
{
StatMsgType m_type;
int m_size;
} PgStat_MsgHdr;
/* ----------
* Space available in a message. This will keep the UDP packets below 1K,
* which should fit unfragmented into the MTU of the loopback interface.
* (Larger values of PGSTAT_MAX_MSG_SIZE would work for that on most
* platforms, but we're being conservative here.)
* ----------
*/
#define PGSTAT_MAX_MSG_SIZE 1000
#define PGSTAT_MSG_PAYLOAD (PGSTAT_MAX_MSG_SIZE - sizeof(PgStat_MsgHdr))
/* ----------
* PgStat_MsgDummy A dummy message, ignored by the collector
* ----------
*/
typedef struct PgStat_MsgDummy
{
PgStat_MsgHdr m_hdr;
} PgStat_MsgDummy;
/* ----------
* PgStat_MsgInquiry Sent by a backend to ask the collector
* to write the stats file(s).
*
* Ordinarily, an inquiry message prompts writing of the global stats file,
* the stats file for shared catalogs, and the stats file for the specified
* database. If databaseid is InvalidOid, only the first two are written.
*
* New file(s) will be written only if the existing file has a timestamp
* older than the specified cutoff_time; this prevents duplicated effort
* when multiple requests arrive at nearly the same time, assuming that
* backends send requests with cutoff_times a little bit in the past.
*
* clock_time should be the requestor's current local time; the collector
* uses this to check for the system clock going backward, but it has no
* effect unless that occurs. We assume clock_time >= cutoff_time, though.
* ----------
*/
typedef struct PgStat_MsgInquiry
{
PgStat_MsgHdr m_hdr;
TimestampTz clock_time; /* observed local clock time */
TimestampTz cutoff_time; /* minimum acceptable file timestamp */
Oid databaseid; /* requested DB (InvalidOid => shared only) */
} PgStat_MsgInquiry;
/* ----------
* PgStat_TableEntry Per-table info in a MsgTabstat
* ----------
*/
typedef struct PgStat_TableEntry
{
Oid t_id;
PgStat_TableCounts t_counts;
} PgStat_TableEntry;
/* ----------
* PgStat_MsgTabstat Sent by the backend to report table
* and buffer access statistics.
* ----------
*/
#define PGSTAT_NUM_TABENTRIES \
((PGSTAT_MSG_PAYLOAD - sizeof(Oid) - 3 * sizeof(int) - 5 * sizeof(PgStat_Counter)) \
/ sizeof(PgStat_TableEntry))
typedef struct PgStat_MsgTabstat
{
PgStat_MsgHdr m_hdr;
Oid m_databaseid;
int m_nentries;
int m_xact_commit;
int m_xact_rollback;
PgStat_Counter m_block_read_time; /* times in microseconds */
PgStat_Counter m_block_write_time;
PgStat_Counter m_session_time;
PgStat_Counter m_active_time;
PgStat_Counter m_idle_in_xact_time;
PgStat_TableEntry m_entry[PGSTAT_NUM_TABENTRIES];
} PgStat_MsgTabstat;
/* ----------
* PgStat_MsgTabpurge Sent by the backend to tell the collector
* about dead tables.
* ----------
*/
#define PGSTAT_NUM_TABPURGE \
((PGSTAT_MSG_PAYLOAD - sizeof(Oid) - sizeof(int)) \
/ sizeof(Oid))
typedef struct PgStat_MsgTabpurge
{
PgStat_MsgHdr m_hdr;
Oid m_databaseid;
int m_nentries;
Oid m_tableid[PGSTAT_NUM_TABPURGE];
} PgStat_MsgTabpurge;
/* ----------
* PgStat_MsgDropdb Sent by the backend to tell the collector
* about a dropped database
* ----------
*/
typedef struct PgStat_MsgDropdb
{
PgStat_MsgHdr m_hdr;
Oid m_databaseid;
} PgStat_MsgDropdb;
/* ----------
* PgStat_MsgResetcounter Sent by the backend to tell the collector
* to reset counters
* ----------
*/
typedef struct PgStat_MsgResetcounter
{
PgStat_MsgHdr m_hdr;
Oid m_databaseid;
} PgStat_MsgResetcounter;
/* ----------
* PgStat_MsgResetsharedcounter Sent by the backend to tell the collector
* to reset a shared counter
* ----------
*/
typedef struct PgStat_MsgResetsharedcounter
{
PgStat_MsgHdr m_hdr;
PgStat_Shared_Reset_Target m_resettarget;
} PgStat_MsgResetsharedcounter;
/* ----------
* PgStat_MsgResetsinglecounter Sent by the backend to tell the collector
* to reset a single counter
* ----------
*/
typedef struct PgStat_MsgResetsinglecounter
{
PgStat_MsgHdr m_hdr;
Oid m_databaseid;
PgStat_Single_Reset_Type m_resettype;
Oid m_objectid;
} PgStat_MsgResetsinglecounter;
/* ----------
* PgStat_MsgResetslrucounter Sent by the backend to tell the collector
* to reset a SLRU counter
* ----------
*/
typedef struct PgStat_MsgResetslrucounter
{
PgStat_MsgHdr m_hdr;
int m_index;
} PgStat_MsgResetslrucounter;
/* ----------
* PgStat_MsgResetreplslotcounter Sent by the backend to tell the collector
* to reset replication slot counter(s)
* ----------
*/
typedef struct PgStat_MsgResetreplslotcounter
{
PgStat_MsgHdr m_hdr;
NameData m_slotname;
bool clearall;
} PgStat_MsgResetreplslotcounter;
/* ----------
* PgStat_MsgResetsubcounter Sent by the backend to tell the collector
* to reset subscription counter(s)
* ----------
*/
typedef struct PgStat_MsgResetsubcounter
{
PgStat_MsgHdr m_hdr;
Oid m_subid; /* InvalidOid means reset all subscription
* stats */
} PgStat_MsgResetsubcounter;
/* ----------
* PgStat_MsgAutovacStart Sent by the autovacuum daemon to signal
* that a database is going to be processed
* ----------
*/
typedef struct PgStat_MsgAutovacStart
{
PgStat_MsgHdr m_hdr;
Oid m_databaseid;
TimestampTz m_start_time;
} PgStat_MsgAutovacStart;
/* ----------
* PgStat_MsgVacuum Sent by the backend or autovacuum daemon
* after VACUUM
* ----------
*/
typedef struct PgStat_MsgVacuum
{
PgStat_MsgHdr m_hdr;
Oid m_databaseid;
Oid m_tableoid;
bool m_autovacuum;
TimestampTz m_vacuumtime;
PgStat_Counter m_live_tuples;
PgStat_Counter m_dead_tuples;
} PgStat_MsgVacuum;
/* ----------
* PgStat_MsgAnalyze Sent by the backend or autovacuum daemon
* after ANALYZE
* ----------
*/
typedef struct PgStat_MsgAnalyze
{
PgStat_MsgHdr m_hdr;
Oid m_databaseid;
Oid m_tableoid;
bool m_autovacuum;
bool m_resetcounter;
TimestampTz m_analyzetime;
PgStat_Counter m_live_tuples;
PgStat_Counter m_dead_tuples;
} 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.
* ----------
*/
typedef struct PgStat_MsgBgWriter
{
PgStat_MsgHdr m_hdr;
PgStat_Counter m_buf_written_clean;
PgStat_Counter m_maxwritten_clean;
PgStat_Counter m_buf_alloc;
} PgStat_MsgBgWriter;
/* ----------
* PgStat_MsgCheckpointer Sent by the checkpointer to update statistics.
* ----------
*/
typedef struct PgStat_MsgCheckpointer
{
PgStat_MsgHdr m_hdr;
PgStat_Counter m_timed_checkpoints;
PgStat_Counter m_requested_checkpoints;
PgStat_Counter m_buf_written_checkpoints;
PgStat_Counter m_buf_written_backend;
PgStat_Counter m_buf_fsync_backend;
PgStat_Counter m_checkpoint_write_time; /* times in milliseconds */
PgStat_Counter m_checkpoint_sync_time;
} PgStat_MsgCheckpointer;
/* ----------
* PgStat_MsgWal Sent by backends and background processes to update WAL statistics.
* ----------
*/
typedef struct PgStat_MsgWal
{
PgStat_MsgHdr m_hdr;
PgStat_Counter m_wal_records;
PgStat_Counter m_wal_fpi;
uint64 m_wal_bytes;
PgStat_Counter m_wal_buffers_full;
PgStat_Counter m_wal_write;
PgStat_Counter m_wal_sync;
PgStat_Counter m_wal_write_time; /* time spent writing wal records in
* microseconds */
PgStat_Counter m_wal_sync_time; /* time spent syncing wal records in
* microseconds */
} PgStat_MsgWal;
/* ----------
* PgStat_MsgSLRU Sent by a backend to update SLRU statistics.
* ----------
*/
typedef struct PgStat_MsgSLRU
{
PgStat_MsgHdr m_hdr;
PgStat_Counter m_index;
PgStat_Counter m_blocks_zeroed;
PgStat_Counter m_blocks_hit;
PgStat_Counter m_blocks_read;
PgStat_Counter m_blocks_written;
PgStat_Counter m_blocks_exists;
PgStat_Counter m_flush;
PgStat_Counter m_truncate;
} PgStat_MsgSLRU;
/* ----------
* PgStat_MsgReplSlot Sent by a backend or a wal sender to update replication
* slot statistics.
* ----------
*/
typedef struct PgStat_MsgReplSlot
{
PgStat_MsgHdr m_hdr;
NameData m_slotname;
bool m_create;
bool m_drop;
PgStat_Counter m_spill_txns;
PgStat_Counter m_spill_count;
PgStat_Counter m_spill_bytes;
PgStat_Counter m_stream_txns;
PgStat_Counter m_stream_count;
PgStat_Counter m_stream_bytes;
PgStat_Counter m_total_txns;
PgStat_Counter m_total_bytes;
} PgStat_MsgReplSlot;
/* ----------
* PgStat_MsgSubscriptionDrop Sent by the backend and autovacuum to tell the
* collector about the dead subscription.
* ----------
*/
typedef struct PgStat_MsgSubscriptionDrop
{
PgStat_MsgHdr m_hdr;
Oid m_subid;
} PgStat_MsgSubscriptionDrop;
/* ----------
* PgStat_MsgSubscriptionError Sent by the apply worker or the table sync
* worker to report an error on the subscription.
* ----------
*/
typedef struct PgStat_MsgSubscriptionError
{
PgStat_MsgHdr m_hdr;
Oid m_subid;
bool m_is_apply_error;
} PgStat_MsgSubscriptionError;
/* ----------
* 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_MsgTempFile Sent by the backend upon creating a temp file
* ----------
*/
typedef struct PgStat_MsgTempFile
{
PgStat_MsgHdr m_hdr;
Oid m_databaseid;
size_t m_filesize;
} PgStat_MsgTempFile;
/* ----------
* 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 counts to transmit.
*
* Note that the time counters are in instr_time format here. We convert to
* microseconds in PgStat_Counter format when transmitting to the collector.
* ----------
*/
typedef struct PgStat_FunctionCounts
{
PgStat_Counter f_numcalls;
instr_time f_total_time;
instr_time f_self_time;
} PgStat_FunctionCounts;
/* ----------
* PgStat_BackendFunctionEntry Entry in backend's per-function hash table
* ----------
*/
typedef struct PgStat_BackendFunctionEntry
{
Oid f_id;
PgStat_FunctionCounts f_counts;
} PgStat_BackendFunctionEntry;
/* ----------
* PgStat_FunctionEntry Per-function info in a MsgFuncstat
* ----------
*/
typedef struct PgStat_FunctionEntry
{
Oid f_id;
PgStat_Counter f_numcalls;
PgStat_Counter f_total_time; /* times in microseconds */
PgStat_Counter f_self_time;
} PgStat_FunctionEntry;
/* ----------
* PgStat_MsgFuncstat Sent by the backend to report function
* usage statistics.
* ----------
*/
#define PGSTAT_NUM_FUNCENTRIES \
((PGSTAT_MSG_PAYLOAD - sizeof(Oid) - sizeof(int)) \
/ sizeof(PgStat_FunctionEntry))
typedef struct PgStat_MsgFuncstat
{
PgStat_MsgHdr m_hdr;
Oid m_databaseid;
int m_nentries;
PgStat_FunctionEntry m_entry[PGSTAT_NUM_FUNCENTRIES];
} PgStat_MsgFuncstat;
/* ----------
* PgStat_MsgFuncpurge Sent by the backend to tell the collector
* about dead functions.
* ----------
*/
#define PGSTAT_NUM_FUNCPURGE \
((PGSTAT_MSG_PAYLOAD - sizeof(Oid) - sizeof(int)) \
/ sizeof(Oid))
typedef struct PgStat_MsgFuncpurge
{
PgStat_MsgHdr m_hdr;
Oid m_databaseid;
int m_nentries;
Oid m_functionid[PGSTAT_NUM_FUNCPURGE];
} PgStat_MsgFuncpurge;
/* ----------
* PgStat_MsgDeadlock Sent by the backend to tell the collector
* about a deadlock that occurred.
* ----------
*/
typedef struct PgStat_MsgDeadlock
{
PgStat_MsgHdr m_hdr;
Oid m_databaseid;
} PgStat_MsgDeadlock;
/* ----------
* PgStat_MsgChecksumFailure Sent by the backend to tell the collector
* about checksum failures noticed.
* ----------
*/
typedef struct PgStat_MsgChecksumFailure
{
PgStat_MsgHdr m_hdr;
Oid m_databaseid;
int m_failurecount;
TimestampTz m_failure_time;
} PgStat_MsgChecksumFailure;
/* ----------
* PgStat_MsgConnect Sent by the backend upon connection
* establishment
* ----------
*/
typedef struct PgStat_MsgConnect
{
PgStat_MsgHdr m_hdr;
Oid m_databaseid;
} PgStat_MsgConnect;
/* ----------
* PgStat_MsgDisconnect Sent by the backend when disconnecting
* ----------
*/
typedef struct PgStat_MsgDisconnect
{
PgStat_MsgHdr m_hdr;
Oid m_databaseid;
SessionEndType m_cause;
} PgStat_MsgDisconnect;
/* ----------
* PgStat_Msg Union over all possible messages.
* ----------
*/
typedef union PgStat_Msg
{
PgStat_MsgHdr msg_hdr;
PgStat_MsgDummy msg_dummy;
PgStat_MsgInquiry msg_inquiry;
PgStat_MsgTabstat msg_tabstat;
PgStat_MsgTabpurge msg_tabpurge;
PgStat_MsgDropdb msg_dropdb;
PgStat_MsgResetcounter msg_resetcounter;
PgStat_MsgResetsharedcounter msg_resetsharedcounter;
PgStat_MsgResetsinglecounter msg_resetsinglecounter;
PgStat_MsgResetslrucounter msg_resetslrucounter;
PgStat_MsgResetreplslotcounter msg_resetreplslotcounter;
PgStat_MsgResetsubcounter msg_resetsubcounter;
PgStat_MsgAutovacStart msg_autovacuum_start;
PgStat_MsgVacuum msg_vacuum;
PgStat_MsgAnalyze msg_analyze;
PgStat_MsgArchiver msg_archiver;
PgStat_MsgBgWriter msg_bgwriter;
PgStat_MsgCheckpointer msg_checkpointer;
PgStat_MsgWal msg_wal;
PgStat_MsgSLRU msg_slru;
PgStat_MsgFuncstat msg_funcstat;
PgStat_MsgFuncpurge msg_funcpurge;
PgStat_MsgRecoveryConflict msg_recoveryconflict;
PgStat_MsgDeadlock msg_deadlock;
PgStat_MsgTempFile msg_tempfile;
PgStat_MsgChecksumFailure msg_checksumfailure;
PgStat_MsgReplSlot msg_replslot;
PgStat_MsgConnect msg_connect;
PgStat_MsgDisconnect msg_disconnect;
PgStat_MsgSubscriptionError msg_subscriptionerror;
PgStat_MsgSubscriptionDrop msg_subscriptiondrop;
} PgStat_Msg;
/* ------------------------------------------------------------
* Statistic collector data structures follow
*
* PGSTAT_FILE_FORMAT_ID should be changed whenever any of these
* data structures change.
* ------------------------------------------------------------
*/
#define PGSTAT_FILE_FORMAT_ID 0x01A5BCA6
/* ----------
* PgStat_StatDBEntry The collector's data per database
* ----------
*/
typedef struct PgStat_StatDBEntry
{
Oid databaseid;
PgStat_Counter n_xact_commit;
PgStat_Counter n_xact_rollback;
PgStat_Counter n_blocks_fetched;
PgStat_Counter n_blocks_hit;
PgStat_Counter n_tuples_returned;
PgStat_Counter n_tuples_fetched;
PgStat_Counter n_tuples_inserted;
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;
PgStat_Counter n_temp_files;
PgStat_Counter n_temp_bytes;
PgStat_Counter n_deadlocks;
PgStat_Counter n_checksum_failures;
TimestampTz last_checksum_failure;
PgStat_Counter n_block_read_time; /* times in microseconds */
PgStat_Counter n_block_write_time;
PgStat_Counter n_sessions;
PgStat_Counter total_session_time;
PgStat_Counter total_active_time;
PgStat_Counter total_idle_in_xact_time;
PgStat_Counter n_sessions_abandoned;
PgStat_Counter n_sessions_fatal;
PgStat_Counter n_sessions_killed;
TimestampTz stat_reset_timestamp;
TimestampTz stats_timestamp; /* time of db stats file update */
/*
* tables and functions must be last in the struct, because we don't write
* the pointers out to the stats file.
*/
HTAB *tables;
HTAB *functions;
} PgStat_StatDBEntry;
/* ----------
* PgStat_StatTabEntry The collector's data per table (or index)
* ----------
*/
typedef struct PgStat_StatTabEntry
{
Oid tableid;
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 n_live_tuples;
PgStat_Counter n_dead_tuples;
PgStat_Counter changes_since_analyze;
PgStat_Counter inserts_since_vacuum;
PgStat_Counter blocks_fetched;
PgStat_Counter blocks_hit;
TimestampTz vacuum_timestamp; /* user initiated vacuum */
PgStat_Counter vacuum_count;
TimestampTz autovac_vacuum_timestamp; /* autovacuum initiated */
PgStat_Counter autovac_vacuum_count;
TimestampTz analyze_timestamp; /* user initiated */
PgStat_Counter analyze_count;
TimestampTz autovac_analyze_timestamp; /* autovacuum initiated */
PgStat_Counter autovac_analyze_count;
} PgStat_StatTabEntry;
/* ----------
* PgStat_StatFuncEntry The collector's data per function
* ----------
*/
typedef struct PgStat_StatFuncEntry
{
Oid functionid;
PgStat_Counter f_numcalls;
PgStat_Counter f_total_time; /* times in microseconds */
PgStat_Counter f_self_time;
} 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;
/*
* Background writer statistics kept in the stats collector
*/
typedef struct PgStat_BgWriterStats
{
PgStat_Counter buf_written_clean;
PgStat_Counter maxwritten_clean;
PgStat_Counter buf_alloc;
TimestampTz stat_reset_timestamp;
} PgStat_BgWriterStats;
/*
* Checkpointer statistics kept in the stats collector
*/
typedef struct PgStat_CheckpointerStats
{
TimestampTz stats_timestamp; /* time of stats file update */
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;
/*
* Global statistics kept in the stats collector
*/
typedef struct PgStat_GlobalStats
{
TimestampTz stats_timestamp; /* time of stats file update */
PgStat_CheckpointerStats checkpointer;
PgStat_BgWriterStats bgwriter;
} PgStat_GlobalStats;
/*
* WAL statistics kept in the stats collector
*/
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;
/*
* SLRU statistics kept in the stats collector
*/
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;
/*
* Replication slot statistics kept in the stats collector
*/
typedef struct PgStat_StatReplSlotEntry
{
NameData slotname;
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;
/*
* Subscription statistics kept in the stats collector.
*/
typedef struct PgStat_StatSubEntry
{
Oid subid; /* hash key (must be first) */
PgStat_Counter apply_error_count;
PgStat_Counter sync_error_count;
TimestampTz stat_reset_timestamp;
} PgStat_StatSubEntry;
/*
* 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 f_start;
} PgStat_FunctionCallUsage;
/* ----------
* GUC parameters
* ----------
*/
extern PGDLLIMPORT bool pgstat_track_counts;
extern PGDLLIMPORT int pgstat_track_functions;
extern char *pgstat_stat_directory;
extern char *pgstat_stat_tmpname;
extern char *pgstat_stat_filename;
/*
* BgWriter statistics counters are updated directly by bgwriter and bufmgr
*/
extern PgStat_MsgBgWriter PendingBgWriterStats;
/*
* Checkpointer statistics counters are updated directly by checkpointer and
* bufmgr.
*/
extern PgStat_MsgCheckpointer PendingCheckpointerStats;
/*
* WAL statistics counter is updated by backends and background processes
*/
extern PgStat_MsgWal WalStats;
/*
* Updated by pgstat_count_buffer_*_time macros
*/
extern PgStat_Counter pgStatBlockReadTime;
extern PgStat_Counter pgStatBlockWriteTime;
/*
* Updated by pgstat_count_conn_*_time macros, called by
* pgstat_report_activity().
*/
extern PgStat_Counter pgStatActiveTime;
extern PgStat_Counter pgStatTransactionIdleTime;
/*
* Updated by the traffic cop and in errfinish()
*/
extern SessionEndType pgStatSessionEndCause;
/* ----------
* Functions called from postmaster
* ----------
*/
extern void pgstat_init(void);
extern int pgstat_start(void);
extern void pgstat_reset_all(void);
extern void allow_immediate_pgstat_restart(void);
#ifdef EXEC_BACKEND
extern void PgstatCollectorMain(int argc, char *argv[]) pg_attribute_noreturn();
#endif
/* ----------
* Functions called from backends
* ----------
*/
extern void pgstat_ping(void);
extern void pgstat_report_stat(bool force);
extern void pgstat_vacuum_stat(void);
extern void pgstat_drop_database(Oid databaseid);
extern void pgstat_clear_snapshot(void);
extern void pgstat_reset_counters(void);
extern void pgstat_reset_shared_counters(const char *);
extern void pgstat_reset_single_counter(Oid objectid, PgStat_Single_Reset_Type type);
extern void pgstat_reset_slru_counter(const char *);
extern void pgstat_reset_replslot_counter(const char *name);
extern void pgstat_reset_subscription_counter(Oid subid);
extern void pgstat_report_connect(Oid dboid);
extern void pgstat_report_autovac(Oid dboid);
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);
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_replslot(const PgStat_StatReplSlotEntry *repSlotStat);
extern void pgstat_report_replslot_create(const char *slotname);
extern void pgstat_report_replslot_drop(const char *slotname);
extern void pgstat_report_subscription_error(Oid subid, bool is_apply_error);
extern void pgstat_report_subscription_drop(Oid subid);
extern void pgstat_initialize(void);
extern PgStat_TableStatus *find_tabstat_entry(Oid rel_id);
extern PgStat_BackendFunctionEntry *find_funcstat_entry(Oid func_id);
extern void pgstat_initstats(Relation rel);
/* nontransactional event counts are simple enough to inline */
#define pgstat_count_heap_scan(rel) \
do { \
if ((rel)->pgstat_info != NULL) \
(rel)->pgstat_info->t_counts.t_numscans++; \
} while (0)
#define pgstat_count_heap_getnext(rel) \
do { \
if ((rel)->pgstat_info != NULL) \
(rel)->pgstat_info->t_counts.t_tuples_returned++; \
} while (0)
#define pgstat_count_heap_fetch(rel) \
do { \
if ((rel)->pgstat_info != NULL) \
(rel)->pgstat_info->t_counts.t_tuples_fetched++; \
} while (0)
#define pgstat_count_index_scan(rel) \
do { \
if ((rel)->pgstat_info != NULL) \
(rel)->pgstat_info->t_counts.t_numscans++; \
} while (0)
#define pgstat_count_index_tuples(rel, n) \
do { \
if ((rel)->pgstat_info != NULL) \
(rel)->pgstat_info->t_counts.t_tuples_returned += (n); \
} while (0)
#define pgstat_count_buffer_read(rel) \
do { \
if ((rel)->pgstat_info != NULL) \
(rel)->pgstat_info->t_counts.t_blocks_fetched++; \
} while (0)
#define pgstat_count_buffer_hit(rel) \
do { \
if ((rel)->pgstat_info != NULL) \
(rel)->pgstat_info->t_counts.t_blocks_hit++; \
} while (0)
#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 void pgstat_count_heap_insert(Relation rel, PgStat_Counter n);
extern void pgstat_count_heap_update(Relation rel, bool hot);
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);
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 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);
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 void pgstat_send_archiver(const char *xlog, bool failed);
extern void pgstat_send_bgwriter(void);
extern void pgstat_send_checkpointer(void);
extern void pgstat_send_wal(bool force);
/* ----------
* Support functions for the SQL-callable functions to
* generate the pgstat* views.
* ----------
*/
extern PgStat_StatDBEntry *pgstat_fetch_stat_dbentry(Oid dbid);
extern PgStat_StatTabEntry *pgstat_fetch_stat_tabentry(Oid relid);
extern PgStat_StatFuncEntry *pgstat_fetch_stat_funcentry(Oid funcid);
extern PgStat_StatSubEntry *pgstat_fetch_stat_subscription(Oid subid);
extern PgStat_ArchiverStats *pgstat_fetch_stat_archiver(void);
extern PgStat_BgWriterStats *pgstat_fetch_stat_bgwriter(void);
extern PgStat_CheckpointerStats *pgstat_fetch_stat_checkpointer(void);
extern PgStat_GlobalStats *pgstat_fetch_global(void);
extern PgStat_WalStats *pgstat_fetch_stat_wal(void);
extern PgStat_SLRUStats *pgstat_fetch_slru(void);
extern PgStat_StatReplSlotEntry *pgstat_fetch_replslot(NameData slotname);
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_slru_name(int slru_idx);
extern int pgstat_slru_index(const char *name);
#endif /* PGSTAT_H */
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