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generated by bitmap index scans. Along the way, simplify and speed up the code for counting sequential and index scans; it was both confusing and inefficient to be taking care of that in the per-tuple loops, IMHO. initdb forced because of internal changes in pg_stat view definitions.
497 lines
13 KiB
C
497 lines
13 KiB
C
/* ----------
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* pgstat.h
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*
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* Definitions for the PostgreSQL statistics collector daemon.
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*
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* Copyright (c) 2001-2005, PostgreSQL Global Development Group
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*
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* $PostgreSQL: pgsql/src/include/pgstat.h,v 1.37 2005/10/06 02:29:19 tgl Exp $
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* ----------
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*/
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#ifndef PGSTAT_H
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#define PGSTAT_H
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#include "libpq/pqcomm.h"
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#include "utils/hsearch.h"
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#include "utils/rel.h"
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#include "utils/timestamp.h"
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/* ----------
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* The types of backend/postmaster -> collector messages
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* ----------
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*/
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typedef enum StatMsgType
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{
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PGSTAT_MTYPE_DUMMY,
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PGSTAT_MTYPE_BESTART,
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PGSTAT_MTYPE_BETERM,
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PGSTAT_MTYPE_ACTIVITY,
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PGSTAT_MTYPE_TABSTAT,
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PGSTAT_MTYPE_TABPURGE,
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PGSTAT_MTYPE_DROPDB,
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PGSTAT_MTYPE_RESETCOUNTER,
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PGSTAT_MTYPE_AUTOVAC_START,
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PGSTAT_MTYPE_VACUUM,
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PGSTAT_MTYPE_ANALYZE
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} StatMsgType;
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/* ----------
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* The data type used for counters.
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* ----------
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*/
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typedef int64 PgStat_Counter;
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/* ------------------------------------------------------------
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* Message formats follow
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* ------------------------------------------------------------
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*/
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/* ----------
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* PgStat_MsgHdr The common message header
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* ----------
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*/
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typedef struct PgStat_MsgHdr
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{
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StatMsgType m_type;
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int m_size;
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int m_backendid;
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int m_procpid;
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} PgStat_MsgHdr;
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/* ----------
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* Space available in a message. This will keep the UDP packets below 1K,
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* which should fit unfragmented into the MTU of the lo interface on most
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* platforms. Does anybody care for platforms where it doesn't?
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* ----------
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*/
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#define PGSTAT_MSG_PAYLOAD (1000 - sizeof(PgStat_MsgHdr))
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/* ----------
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* PgStat_TableEntry Per-table info in a MsgTabstat
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*
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* Note: for a table, tuples_returned is the number of tuples successfully
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* fetched by heap_getnext, while tuples_fetched is the number of tuples
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* successfully fetched by heap_fetch under the control of bitmap indexscans.
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* For an index, tuples_returned is the number of index entries returned by
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* the index AM, while tuples_fetched is the number of tuples successfully
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* fetched by heap_fetch under the control of simple indexscans for this index.
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* ----------
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*/
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typedef struct PgStat_TableEntry
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{
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Oid t_id;
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PgStat_Counter t_numscans;
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PgStat_Counter t_tuples_returned;
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PgStat_Counter t_tuples_fetched;
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PgStat_Counter t_tuples_inserted;
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PgStat_Counter t_tuples_updated;
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PgStat_Counter t_tuples_deleted;
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PgStat_Counter t_blocks_fetched;
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PgStat_Counter t_blocks_hit;
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} PgStat_TableEntry;
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/* ----------
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* PgStat_MsgDummy A dummy message, ignored by the collector
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* ----------
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*/
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typedef struct PgStat_MsgDummy
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{
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PgStat_MsgHdr m_hdr;
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char m_dummy[512];
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} PgStat_MsgDummy;
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/* ----------
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* PgStat_MsgBestart Sent by the backend on startup
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* ----------
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*/
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typedef struct PgStat_MsgBestart
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{
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PgStat_MsgHdr m_hdr;
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Oid m_databaseid;
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Oid m_userid;
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SockAddr m_clientaddr;
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} PgStat_MsgBestart;
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/* ----------
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* PgStat_MsgBeterm Sent by the postmaster after backend exit
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* ----------
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*/
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typedef struct PgStat_MsgBeterm
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{
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PgStat_MsgHdr m_hdr;
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} PgStat_MsgBeterm;
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/* ----------
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* PgStat_MsgAutovacStart Sent by the autovacuum daemon to signal
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* that a database is going to be processed
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* ----------
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*/
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typedef struct PgStat_MsgAutovacStart
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{
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PgStat_MsgHdr m_hdr;
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Oid m_databaseid;
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TimestampTz m_start_time;
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} PgStat_MsgAutovacStart;
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/* ----------
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* PgStat_MsgVacuum Sent by the backend or autovacuum daemon
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* after VACUUM or VACUUM ANALYZE
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* ----------
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*/
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typedef struct PgStat_MsgVacuum
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{
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PgStat_MsgHdr m_hdr;
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Oid m_databaseid;
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Oid m_tableoid;
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bool m_analyze;
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PgStat_Counter m_tuples;
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} PgStat_MsgVacuum;
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/* ----------
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* PgStat_MsgAnalyze Sent by the backend or autovacuum daemon
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* after ANALYZE
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* ----------
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*/
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typedef struct PgStat_MsgAnalyze
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{
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PgStat_MsgHdr m_hdr;
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Oid m_databaseid;
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Oid m_tableoid;
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PgStat_Counter m_live_tuples;
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PgStat_Counter m_dead_tuples;
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} PgStat_MsgAnalyze;
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/* ----------
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* PgStat_MsgActivity Sent by the backends when they start
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* to parse a query.
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* ----------
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*/
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#define PGSTAT_ACTIVITY_SIZE PGSTAT_MSG_PAYLOAD
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typedef struct PgStat_MsgActivity
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{
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PgStat_MsgHdr m_hdr;
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char m_what[PGSTAT_ACTIVITY_SIZE];
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} PgStat_MsgActivity;
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/* ----------
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* PgStat_MsgTabstat Sent by the backend to report table
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* and buffer access statistics.
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* ----------
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*/
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#define PGSTAT_NUM_TABENTRIES \
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((PGSTAT_MSG_PAYLOAD - sizeof(Oid) - 3 * sizeof(int)) \
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/ sizeof(PgStat_TableEntry))
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typedef struct PgStat_MsgTabstat
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{
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PgStat_MsgHdr m_hdr;
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Oid m_databaseid;
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int m_nentries;
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int m_xact_commit;
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int m_xact_rollback;
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PgStat_TableEntry m_entry[PGSTAT_NUM_TABENTRIES];
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} PgStat_MsgTabstat;
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/* ----------
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* PgStat_MsgTabpurge Sent by the backend to tell the collector
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* about dead tables.
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* ----------
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*/
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#define PGSTAT_NUM_TABPURGE \
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((PGSTAT_MSG_PAYLOAD - sizeof(Oid) - sizeof(int)) \
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/ sizeof(Oid))
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typedef struct PgStat_MsgTabpurge
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{
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PgStat_MsgHdr m_hdr;
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Oid m_databaseid;
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int m_nentries;
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Oid m_tableid[PGSTAT_NUM_TABPURGE];
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} PgStat_MsgTabpurge;
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/* ----------
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* PgStat_MsgDropdb Sent by the backend to tell the collector
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* about a dropped database
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* ----------
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*/
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typedef struct PgStat_MsgDropdb
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{
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PgStat_MsgHdr m_hdr;
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Oid m_databaseid;
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} PgStat_MsgDropdb;
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/* ----------
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* PgStat_MsgResetcounter Sent by the backend to tell the collector
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* to reset counters
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* ----------
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*/
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typedef struct PgStat_MsgResetcounter
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{
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PgStat_MsgHdr m_hdr;
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Oid m_databaseid;
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} PgStat_MsgResetcounter;
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/* ----------
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* PgStat_Msg Union over all possible messages.
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* ----------
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*/
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typedef union PgStat_Msg
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{
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PgStat_MsgHdr msg_hdr;
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PgStat_MsgDummy msg_dummy;
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PgStat_MsgBestart msg_bestart;
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PgStat_MsgActivity msg_activity;
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PgStat_MsgTabstat msg_tabstat;
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PgStat_MsgTabpurge msg_tabpurge;
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PgStat_MsgDropdb msg_dropdb;
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PgStat_MsgResetcounter msg_resetcounter;
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PgStat_MsgAutovacStart msg_autovacuum;
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PgStat_MsgVacuum msg_vacuum;
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PgStat_MsgAnalyze msg_analyze;
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} PgStat_Msg;
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/* ------------------------------------------------------------
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* Statistic collector data structures follow
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*
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* PGSTAT_FILE_FORMAT_ID should be changed whenever any of these
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* data structures change.
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* ------------------------------------------------------------
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*/
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#define PGSTAT_FILE_FORMAT_ID 0x01A5BC93
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/* ----------
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* PgStat_StatDBEntry The collector's data per database
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* ----------
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*/
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typedef struct PgStat_StatDBEntry
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{
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Oid databaseid;
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HTAB *tables;
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int n_backends;
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PgStat_Counter n_xact_commit;
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PgStat_Counter n_xact_rollback;
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PgStat_Counter n_blocks_fetched;
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PgStat_Counter n_blocks_hit;
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int destroy;
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TimestampTz last_autovac_time;
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} PgStat_StatDBEntry;
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/* ----------
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* PgStat_StatBeEntry The collector's data per backend
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* ----------
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*/
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typedef struct PgStat_StatBeEntry
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{
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/* An entry is non-empty iff procpid > 0 */
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int procpid;
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TimestampTz start_timestamp;
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TimestampTz activity_start_timestamp;
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char activity[PGSTAT_ACTIVITY_SIZE];
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/*
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* The following fields are initialized by the BESTART message. If
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* we have received messages from a backend before we have
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* received its BESTART, these fields will be uninitialized:
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* userid and databaseid will be InvalidOid, and clientaddr will
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* be undefined.
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*/
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Oid userid;
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Oid databaseid;
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SockAddr clientaddr;
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} PgStat_StatBeEntry;
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/* ----------
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* PgStat_StatBeDead Because UDP packets can arrive out of
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* order, we need to keep some information
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* about backends that are known to be
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* dead for some seconds. This info is held
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* in a hash table of these structs.
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* ----------
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*/
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typedef struct PgStat_StatBeDead
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{
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int procpid;
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int backendid;
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int destroy;
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} PgStat_StatBeDead;
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/* ----------
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* PgStat_StatTabEntry The collector's data per table (or index)
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* ----------
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*/
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typedef struct PgStat_StatTabEntry
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{
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Oid tableid;
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PgStat_Counter numscans;
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PgStat_Counter tuples_returned;
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PgStat_Counter tuples_fetched;
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PgStat_Counter tuples_inserted;
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PgStat_Counter tuples_updated;
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PgStat_Counter tuples_deleted;
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PgStat_Counter n_live_tuples;
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PgStat_Counter n_dead_tuples;
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PgStat_Counter last_anl_tuples;
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PgStat_Counter blocks_fetched;
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PgStat_Counter blocks_hit;
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int destroy;
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} PgStat_StatTabEntry;
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/* ----------
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* GUC parameters
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* ----------
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*/
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extern bool pgstat_collect_startcollector;
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extern bool pgstat_collect_resetonpmstart;
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extern bool pgstat_collect_querystring;
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extern bool pgstat_collect_tuplelevel;
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extern bool pgstat_collect_blocklevel;
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/* ----------
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* Functions called from postmaster
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* ----------
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*/
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extern void pgstat_init(void);
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extern int pgstat_start(void);
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extern void pgstat_beterm(int pid);
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extern void pgstat_reset_all(void);
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#ifdef EXEC_BACKEND
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extern void PgstatBufferMain(int argc, char *argv[]);
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extern void PgstatCollectorMain(int argc, char *argv[]);
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#endif
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/* ----------
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* Functions called from backends
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* ----------
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*/
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extern void pgstat_bestart(void);
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extern void pgstat_ping(void);
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extern void pgstat_report_activity(const char *what);
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extern void pgstat_report_tabstat(void);
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extern void pgstat_report_autovac(Oid dboid);
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extern void pgstat_report_vacuum(Oid tableoid, bool shared,
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bool analyze, PgStat_Counter tuples);
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extern void pgstat_report_analyze(Oid tableoid, bool shared,
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PgStat_Counter livetuples,
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PgStat_Counter deadtuples);
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extern int pgstat_vacuum_tabstat(void);
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extern void pgstat_reset_counters(void);
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extern void pgstat_initstats(PgStat_Info *stats, Relation rel);
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#define pgstat_count_heap_scan(s) \
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do { \
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if (pgstat_collect_tuplelevel && (s)->tabentry != NULL) \
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((PgStat_TableEntry *)((s)->tabentry))->t_numscans++; \
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} while (0)
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/* kluge for bitmap scans: */
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#define pgstat_discount_heap_scan(s) \
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do { \
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if (pgstat_collect_tuplelevel && (s)->tabentry != NULL) \
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((PgStat_TableEntry *)((s)->tabentry))->t_numscans--; \
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} while (0)
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#define pgstat_count_heap_getnext(s) \
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do { \
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if (pgstat_collect_tuplelevel && (s)->tabentry != NULL) \
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((PgStat_TableEntry *)((s)->tabentry))->t_tuples_returned++; \
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} while (0)
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#define pgstat_count_heap_fetch(s) \
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do { \
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if (pgstat_collect_tuplelevel && (s)->tabentry != NULL) \
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((PgStat_TableEntry *)((s)->tabentry))->t_tuples_fetched++; \
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} while (0)
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#define pgstat_count_heap_insert(s) \
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do { \
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if (pgstat_collect_tuplelevel && (s)->tabentry != NULL) \
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((PgStat_TableEntry *)((s)->tabentry))->t_tuples_inserted++; \
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} while (0)
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#define pgstat_count_heap_update(s) \
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do { \
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if (pgstat_collect_tuplelevel && (s)->tabentry != NULL) \
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((PgStat_TableEntry *)((s)->tabentry))->t_tuples_updated++; \
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} while (0)
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#define pgstat_count_heap_delete(s) \
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do { \
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if (pgstat_collect_tuplelevel && (s)->tabentry != NULL) \
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((PgStat_TableEntry *)((s)->tabentry))->t_tuples_deleted++; \
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} while (0)
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#define pgstat_count_index_scan(s) \
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do { \
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if (pgstat_collect_tuplelevel && (s)->tabentry != NULL) \
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((PgStat_TableEntry *)((s)->tabentry))->t_numscans++; \
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} while (0)
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#define pgstat_count_index_tuples(s, n) \
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do { \
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if (pgstat_collect_tuplelevel && (s)->tabentry != NULL) \
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((PgStat_TableEntry *)((s)->tabentry))->t_tuples_returned += (n); \
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} while (0)
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#define pgstat_count_buffer_read(s,r) \
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do { \
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if (pgstat_collect_blocklevel) { \
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if ((s)->tabentry != NULL) \
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((PgStat_TableEntry *)((s)->tabentry))->t_blocks_fetched++; \
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else { \
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pgstat_initstats((s), (r)); \
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if ((s)->tabentry != NULL) \
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((PgStat_TableEntry *)((s)->tabentry))->t_blocks_fetched++; \
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} \
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} \
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} while (0)
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#define pgstat_count_buffer_hit(s,r) \
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do { \
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if (pgstat_collect_blocklevel) { \
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if ((s)->tabentry != NULL) \
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((PgStat_TableEntry *)((s)->tabentry))->t_blocks_hit++; \
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else { \
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pgstat_initstats((s), (r)); \
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if ((s)->tabentry != NULL) \
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((PgStat_TableEntry *)((s)->tabentry))->t_blocks_hit++; \
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} \
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} \
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} while (0)
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extern void pgstat_count_xact_commit(void);
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extern void pgstat_count_xact_rollback(void);
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/* ----------
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* Support functions for the SQL-callable functions to
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* generate the pgstat* views.
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* ----------
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*/
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extern PgStat_StatDBEntry *pgstat_fetch_stat_dbentry(Oid dbid);
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extern PgStat_StatTabEntry *pgstat_fetch_stat_tabentry(Oid relid);
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extern PgStat_StatBeEntry *pgstat_fetch_stat_beentry(int beid);
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extern int pgstat_fetch_stat_numbackends(void);
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#endif /* PGSTAT_H */
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