diff --git a/src/backend/catalog/system_views.sql b/src/backend/catalog/system_views.sql index 262b372490..aa89240e85 100644 --- a/src/backend/catalog/system_views.sql +++ b/src/backend/catalog/system_views.sql @@ -492,6 +492,21 @@ CREATE VIEW pg_stat_activity AS WHERE S.datid = D.oid AND S.usesysid = U.oid; +CREATE VIEW pg_stat_replication AS + SELECT + S.procpid, + S.usesysid, + U.rolname AS usename, + S.application_name, + S.client_addr, + S.client_port, + S.backend_start, + W.sent_location + FROM pg_stat_get_activity(NULL) AS S, pg_authid U, + pg_stat_get_wal_senders() AS W + WHERE S.usesysid = U.oid AND + S.procpid = W.procpid; + CREATE VIEW pg_stat_database AS SELECT D.oid AS datid, diff --git a/src/backend/replication/walsender.c b/src/backend/replication/walsender.c index 269d200707..f2a3ee2073 100644 --- a/src/backend/replication/walsender.c +++ b/src/backend/replication/walsender.c @@ -37,6 +37,7 @@ #include #include +#include "funcapi.h" #include "access/xlog_internal.h" #include "catalog/pg_type.h" #include "libpq/libpq.h" @@ -49,6 +50,7 @@ #include "storage/ipc.h" #include "storage/pmsignal.h" #include "tcop/tcopprot.h" +#include "utils/builtins.h" #include "utils/guc.h" #include "utils/memutils.h" #include "utils/ps_status.h" @@ -942,6 +944,78 @@ WalSndWakeup(void) SetLatch(&WalSndCtl->walsnds[i].latch); } +/* + * Returns activity of walsenders, including pids and xlog locations sent to + * standby servers. + */ +Datum +pg_stat_get_wal_senders(PG_FUNCTION_ARGS) +{ +#define PG_STAT_GET_WAL_SENDERS_COLS 2 + ReturnSetInfo *rsinfo = (ReturnSetInfo *) fcinfo->resultinfo; + TupleDesc tupdesc; + Tuplestorestate *tupstore; + MemoryContext per_query_ctx; + MemoryContext oldcontext; + int i; + + /* check to see if caller supports us returning a tuplestore */ + if (rsinfo == NULL || !IsA(rsinfo, ReturnSetInfo)) + ereport(ERROR, + (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), + errmsg("set-valued function called in context that cannot accept a set"))); + if (!(rsinfo->allowedModes & SFRM_Materialize)) + ereport(ERROR, + (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), + errmsg("materialize mode required, but it is not " \ + "allowed in this context"))); + + /* Build a tuple descriptor for our result type */ + if (get_call_result_type(fcinfo, NULL, &tupdesc) != TYPEFUNC_COMPOSITE) + elog(ERROR, "return type must be a row type"); + + per_query_ctx = rsinfo->econtext->ecxt_per_query_memory; + oldcontext = MemoryContextSwitchTo(per_query_ctx); + + tupstore = tuplestore_begin_heap(true, false, work_mem); + rsinfo->returnMode = SFRM_Materialize; + rsinfo->setResult = tupstore; + rsinfo->setDesc = tupdesc; + + MemoryContextSwitchTo(oldcontext); + + for (i = 0; i < max_wal_senders; i++) + { + /* use volatile pointer to prevent code rearrangement */ + volatile WalSnd *walsnd = &WalSndCtl->walsnds[i]; + char sent_location[MAXFNAMELEN]; + XLogRecPtr sentPtr; + Datum values[PG_STAT_GET_WAL_SENDERS_COLS]; + bool nulls[PG_STAT_GET_WAL_SENDERS_COLS]; + + if (walsnd->pid == 0) + continue; + + SpinLockAcquire(&walsnd->mutex); + sentPtr = walsnd->sentPtr; + SpinLockRelease(&walsnd->mutex); + + snprintf(sent_location, sizeof(sent_location), "%X/%X", + sentPtr.xlogid, sentPtr.xrecoff); + + memset(nulls, 0, sizeof(nulls)); + values[0] = Int32GetDatum(walsnd->pid); + values[1] = CStringGetTextDatum(sent_location); + + tuplestore_putvalues(tupstore, tupdesc, values, nulls); + } + + /* clean up and return the tuplestore */ + tuplestore_donestoring(tupstore); + + return (Datum) 0; +} + /* * This isn't currently used for anything. Monitoring tools might be * interested in the future, and we'll need something like this in the diff --git a/src/include/catalog/pg_proc.h b/src/include/catalog/pg_proc.h index d6ed60a421..dcb494f57d 100644 --- a/src/include/catalog/pg_proc.h +++ b/src/include/catalog/pg_proc.h @@ -3075,6 +3075,8 @@ DATA(insert OID = 1936 ( pg_stat_get_backend_idset PGNSP PGUID 12 1 100 0 f f DESCR("statistics: currently active backend IDs"); DATA(insert OID = 2022 ( pg_stat_get_activity PGNSP PGUID 12 1 100 0 f f f f t s 1 0 2249 "23" "{23,26,23,26,25,25,16,1184,1184,1184,869,23}" "{i,o,o,o,o,o,o,o,o,o,o,o}" "{pid,datid,procpid,usesysid,application_name,current_query,waiting,xact_start,query_start,backend_start,client_addr,client_port}" _null_ pg_stat_get_activity _null_ _null_ _null_ )); DESCR("statistics: information about currently active backends"); +DATA(insert OID = 3099 ( pg_stat_get_wal_senders PGNSP PGUID 12 1 10 0 f f f f t s 0 0 2249 "" "{23,25}" "{o,o}" "{procpid,sent_location}" _null_ pg_stat_get_wal_senders _null_ _null_ _null_ )); +DESCR("statistics: information about currently active replication"); DATA(insert OID = 2026 ( pg_backend_pid PGNSP PGUID 12 1 0 0 f f f t f s 0 0 23 "" _null_ _null_ _null_ _null_ pg_backend_pid _null_ _null_ _null_ )); DESCR("statistics: current backend PID"); DATA(insert OID = 1937 ( pg_stat_get_backend_pid PGNSP PGUID 12 1 0 0 f f f t f s 1 0 23 "23" _null_ _null_ _null_ _null_ pg_stat_get_backend_pid _null_ _null_ _null_ )); diff --git a/src/include/replication/walsender.h b/src/include/replication/walsender.h index 6f543ae3f4..d6767b9dcf 100644 --- a/src/include/replication/walsender.h +++ b/src/include/replication/walsender.h @@ -54,4 +54,6 @@ extern Size WalSndShmemSize(void); extern void WalSndShmemInit(void); extern void WalSndWakeup(void); +extern Datum pg_stat_get_wal_senders(PG_FUNCTION_ARGS); + #endif /* _WALSENDER_H */ diff --git a/src/test/regress/expected/rules.out b/src/test/regress/expected/rules.out index a6baae242b..61bee46a97 100644 --- a/src/test/regress/expected/rules.out +++ b/src/test/regress/expected/rules.out @@ -1296,6 +1296,7 @@ SELECT viewname, definition FROM pg_views WHERE schemaname <> 'information_schem pg_stat_bgwriter | SELECT pg_stat_get_bgwriter_timed_checkpoints() AS checkpoints_timed, pg_stat_get_bgwriter_requested_checkpoints() AS checkpoints_req, pg_stat_get_bgwriter_buf_written_checkpoints() AS buffers_checkpoint, pg_stat_get_bgwriter_buf_written_clean() AS buffers_clean, pg_stat_get_bgwriter_maxwritten_clean() AS maxwritten_clean, pg_stat_get_buf_written_backend() AS buffers_backend, pg_stat_get_buf_fsync_backend() AS buffers_backend_fsync, pg_stat_get_buf_alloc() AS buffers_alloc; pg_stat_database | SELECT d.oid AS datid, d.datname, pg_stat_get_db_numbackends(d.oid) AS numbackends, pg_stat_get_db_xact_commit(d.oid) AS xact_commit, pg_stat_get_db_xact_rollback(d.oid) AS xact_rollback, (pg_stat_get_db_blocks_fetched(d.oid) - pg_stat_get_db_blocks_hit(d.oid)) AS blks_read, pg_stat_get_db_blocks_hit(d.oid) AS blks_hit, pg_stat_get_db_tuples_returned(d.oid) AS tup_returned, pg_stat_get_db_tuples_fetched(d.oid) AS tup_fetched, pg_stat_get_db_tuples_inserted(d.oid) AS tup_inserted, pg_stat_get_db_tuples_updated(d.oid) AS tup_updated, pg_stat_get_db_tuples_deleted(d.oid) AS tup_deleted, pg_stat_get_db_conflict_all(d.oid) AS conflicts FROM pg_database d; pg_stat_database_conflicts | SELECT d.oid AS datid, d.datname, pg_stat_get_db_conflict_tablespace(d.oid) AS confl_tablespace, pg_stat_get_db_conflict_lock(d.oid) AS confl_lock, pg_stat_get_db_conflict_snapshot(d.oid) AS confl_snapshot, pg_stat_get_db_conflict_bufferpin(d.oid) AS confl_bufferpin, pg_stat_get_db_conflict_startup_deadlock(d.oid) AS confl_deadlock FROM pg_database d; + pg_stat_replication | SELECT s.procpid, s.usesysid, u.rolname AS usename, s.application_name, s.client_addr, s.client_port, s.backend_start, w.sent_location FROM pg_stat_get_activity(NULL::integer) s(datid, procpid, usesysid, application_name, current_query, waiting, xact_start, query_start, backend_start, client_addr, client_port), pg_authid u, pg_stat_get_wal_senders() w(procpid, sent_location) WHERE ((s.usesysid = u.oid) AND (s.procpid = w.procpid)); pg_stat_sys_indexes | SELECT pg_stat_all_indexes.relid, pg_stat_all_indexes.indexrelid, pg_stat_all_indexes.schemaname, pg_stat_all_indexes.relname, pg_stat_all_indexes.indexrelname, pg_stat_all_indexes.idx_scan, pg_stat_all_indexes.idx_tup_read, pg_stat_all_indexes.idx_tup_fetch FROM pg_stat_all_indexes WHERE ((pg_stat_all_indexes.schemaname = ANY (ARRAY['pg_catalog'::name, 'information_schema'::name])) OR (pg_stat_all_indexes.schemaname ~ '^pg_toast'::text)); pg_stat_sys_tables | SELECT pg_stat_all_tables.relid, pg_stat_all_tables.schemaname, pg_stat_all_tables.relname, pg_stat_all_tables.seq_scan, pg_stat_all_tables.seq_tup_read, pg_stat_all_tables.idx_scan, pg_stat_all_tables.idx_tup_fetch, pg_stat_all_tables.n_tup_ins, pg_stat_all_tables.n_tup_upd, pg_stat_all_tables.n_tup_del, pg_stat_all_tables.n_tup_hot_upd, pg_stat_all_tables.n_live_tup, pg_stat_all_tables.n_dead_tup, pg_stat_all_tables.last_vacuum, pg_stat_all_tables.last_autovacuum, pg_stat_all_tables.last_analyze, pg_stat_all_tables.last_autoanalyze, pg_stat_all_tables.vacuum_count, pg_stat_all_tables.autovacuum_count, pg_stat_all_tables.analyze_count, pg_stat_all_tables.autoanalyze_count FROM pg_stat_all_tables WHERE ((pg_stat_all_tables.schemaname = ANY (ARRAY['pg_catalog'::name, 'information_schema'::name])) OR (pg_stat_all_tables.schemaname ~ '^pg_toast'::text)); pg_stat_user_functions | SELECT p.oid AS funcid, n.nspname AS schemaname, p.proname AS funcname, pg_stat_get_function_calls(p.oid) AS calls, (pg_stat_get_function_time(p.oid) / 1000) AS total_time, (pg_stat_get_function_self_time(p.oid) / 1000) AS self_time FROM (pg_proc p LEFT JOIN pg_namespace n ON ((n.oid = p.pronamespace))) WHERE ((p.prolang <> (12)::oid) AND (pg_stat_get_function_calls(p.oid) IS NOT NULL)); @@ -1335,7 +1336,7 @@ SELECT viewname, definition FROM pg_views WHERE schemaname <> 'information_schem shoelace_obsolete | SELECT shoelace.sl_name, shoelace.sl_avail, shoelace.sl_color, shoelace.sl_len, shoelace.sl_unit, shoelace.sl_len_cm FROM shoelace WHERE (NOT (EXISTS (SELECT shoe.shoename FROM shoe WHERE (shoe.slcolor = shoelace.sl_color)))); street | SELECT r.name, r.thepath, c.cname FROM ONLY road r, real_city c WHERE (c.outline ## r.thepath); toyemp | SELECT emp.name, emp.age, emp.location, (12 * emp.salary) AS annualsal FROM emp; -(57 rows) +(58 rows) SELECT tablename, rulename, definition FROM pg_rules ORDER BY tablename, rulename;