system_views.sql

/*
 * PostgreSQL System Views
 *
 * Copyright (c) 1996-2011, PostgreSQL Global Development Group
 *
 * src/backend/catalog/system_views.sql
 */

CREATE VIEW pg_roles AS
    SELECT
        rolname,
        rolsuper,
        rolinherit,
        rolcreaterole,
        rolcreatedb,
        rolcatupdate,
        rolcanlogin,
        rolreplication,
        rolconnlimit,
        '********'::text as rolpassword,
        rolvaliduntil,
        setconfig as rolconfig,
        pg_authid.oid
    FROM pg_authid LEFT JOIN pg_db_role_setting s
    ON (pg_authid.oid = setrole AND setdatabase = 0);

CREATE VIEW pg_shadow AS
    SELECT
        rolname AS usename,
        pg_authid.oid AS usesysid,
        rolcreatedb AS usecreatedb,
        rolsuper AS usesuper,
        rolcatupdate AS usecatupd,
        rolreplication AS userepl,
        rolpassword AS passwd,
        rolvaliduntil::abstime AS valuntil,
        setconfig AS useconfig
    FROM pg_authid LEFT JOIN pg_db_role_setting s
    ON (pg_authid.oid = setrole AND setdatabase = 0)
    WHERE rolcanlogin;

REVOKE ALL on pg_shadow FROM public;

CREATE VIEW pg_group AS
    SELECT
        rolname AS groname,
        oid AS grosysid,
        ARRAY(SELECT member FROM pg_auth_members WHERE roleid = oid) AS grolist
    FROM pg_authid
    WHERE NOT rolcanlogin;

CREATE VIEW pg_user AS
    SELECT
        usename,
        usesysid,
        usecreatedb,
        usesuper,
        usecatupd,
        userepl,
        '********'::text as passwd,
        valuntil,
        useconfig
    FROM pg_shadow;

CREATE VIEW pg_rules AS
    SELECT
        N.nspname AS schemaname,
        C.relname AS tablename,
        R.rulename AS rulename,
        pg_get_ruledef(R.oid) AS definition
    FROM (pg_rewrite R JOIN pg_class C ON (C.oid = R.ev_class))
        LEFT JOIN pg_namespace N ON (N.oid = C.relnamespace)
    WHERE R.rulename != '_RETURN';

CREATE VIEW pg_views AS
    SELECT
        N.nspname AS schemaname,
        C.relname AS viewname,
        pg_get_userbyid(C.relowner) AS viewowner,
        pg_get_viewdef(C.oid) AS definition
    FROM pg_class C LEFT JOIN pg_namespace N ON (N.oid = C.relnamespace)
    WHERE C.relkind = 'v';

CREATE VIEW pg_tables AS
    SELECT
        N.nspname AS schemaname,
        C.relname AS tablename,
        pg_get_userbyid(C.relowner) AS tableowner,
        T.spcname AS tablespace,
        C.relhasindex AS hasindexes,
        C.relhasrules AS hasrules,
        C.relhastriggers AS hastriggers
    FROM pg_class C LEFT JOIN pg_namespace N ON (N.oid = C.relnamespace)
         LEFT JOIN pg_tablespace T ON (T.oid = C.reltablespace)
    WHERE C.relkind = 'r';

CREATE VIEW pg_indexes AS
    SELECT
        N.nspname AS schemaname,
        C.relname AS tablename,
        I.relname AS indexname,
        T.spcname AS tablespace,
        pg_get_indexdef(I.oid) AS indexdef
    FROM pg_index X JOIN pg_class C ON (C.oid = X.indrelid)
         JOIN pg_class I ON (I.oid = X.indexrelid)
         LEFT JOIN pg_namespace N ON (N.oid = C.relnamespace)
         LEFT JOIN pg_tablespace T ON (T.oid = I.reltablespace)
    WHERE C.relkind = 'r' AND I.relkind = 'i';

CREATE VIEW pg_stats AS
    SELECT
        nspname AS schemaname,
        relname AS tablename,
        attname AS attname,
        stainherit AS inherited,
        stanullfrac AS null_frac,
        stawidth AS avg_width,
        stadistinct AS n_distinct,
        CASE
            WHEN stakind1 IN (1, 4) THEN stavalues1
            WHEN stakind2 IN (1, 4) THEN stavalues2
            WHEN stakind3 IN (1, 4) THEN stavalues3
            WHEN stakind4 IN (1, 4) THEN stavalues4
        END AS most_common_vals,
        CASE
            WHEN stakind1 IN (1, 4) THEN stanumbers1
            WHEN stakind2 IN (1, 4) THEN stanumbers2
            WHEN stakind3 IN (1, 4) THEN stanumbers3
            WHEN stakind4 IN (1, 4) THEN stanumbers4
        END AS most_common_freqs,
        CASE
            WHEN stakind1 = 2 THEN stavalues1
            WHEN stakind2 = 2 THEN stavalues2
            WHEN stakind3 = 2 THEN stavalues3
            WHEN stakind4 = 2 THEN stavalues4
        END AS histogram_bounds,
        CASE
            WHEN stakind1 = 3 THEN stanumbers1[1]
            WHEN stakind2 = 3 THEN stanumbers2[1]
            WHEN stakind3 = 3 THEN stanumbers3[1]
            WHEN stakind4 = 3 THEN stanumbers4[1]
        END AS correlation
    FROM pg_statistic s JOIN pg_class c ON (c.oid = s.starelid)
         JOIN pg_attribute a ON (c.oid = attrelid AND attnum = s.staattnum)
         LEFT JOIN pg_namespace n ON (n.oid = c.relnamespace)
    WHERE NOT attisdropped AND has_column_privilege(c.oid, a.attnum, 'select');

REVOKE ALL on pg_statistic FROM public;

CREATE VIEW pg_locks AS
    SELECT * FROM pg_lock_status() AS L;

CREATE VIEW pg_cursors AS
    SELECT * FROM pg_cursor() AS C;

CREATE VIEW pg_available_extensions AS
    SELECT E.name, E.version, X.extversion AS installed,
           N.nspname AS schema, E.relocatable, E.comment
      FROM pg_available_extensions() AS E
           LEFT JOIN pg_extension AS X ON E.name = X.extname
           LEFT JOIN pg_namespace AS N on N.oid = X.extnamespace;

CREATE VIEW pg_prepared_xacts AS
    SELECT P.transaction, P.gid, P.prepared,
           U.rolname AS owner, D.datname AS database
    FROM pg_prepared_xact() AS P
         LEFT JOIN pg_authid U ON P.ownerid = U.oid
         LEFT JOIN pg_database D ON P.dbid = D.oid;

CREATE VIEW pg_prepared_statements AS
    SELECT * FROM pg_prepared_statement() AS P;

CREATE VIEW pg_seclabels AS
SELECT
	l.objoid, l.classoid, l.objsubid,
	CASE WHEN rel.relkind = 'r' THEN 'table'::text
		 WHEN rel.relkind = 'v' THEN 'view'::text
		 WHEN rel.relkind = 'S' THEN 'sequence'::text
		 WHEN rel.relkind = 'f' THEN 'foreign table'::text END AS objtype,
	rel.relnamespace AS objnamespace,
	CASE WHEN pg_table_is_visible(rel.oid)
	     THEN quote_ident(rel.relname)
	     ELSE quote_ident(nsp.nspname) || '.' || quote_ident(rel.relname)
	     END AS objname,
	l.provider, l.label
FROM
	pg_seclabel l
	JOIN pg_class rel ON l.classoid = rel.tableoid AND l.objoid = rel.oid
	JOIN pg_namespace nsp ON rel.relnamespace = nsp.oid
WHERE
	l.objsubid = 0
UNION ALL
SELECT
	l.objoid, l.classoid, l.objsubid,
	'column'::text AS objtype,
	rel.relnamespace AS objnamespace,
	CASE WHEN pg_table_is_visible(rel.oid)
	     THEN quote_ident(rel.relname)
	     ELSE quote_ident(nsp.nspname) || '.' || quote_ident(rel.relname)
	     END || '.' || att.attname AS objname,
	l.provider, l.label
FROM
	pg_seclabel l
	JOIN pg_class rel ON l.classoid = rel.tableoid AND l.objoid = rel.oid
	JOIN pg_attribute att
	     ON rel.oid = att.attrelid AND l.objsubid = att.attnum
	JOIN pg_namespace nsp ON rel.relnamespace = nsp.oid
WHERE
	l.objsubid != 0
UNION ALL
SELECT
	l.objoid, l.classoid, l.objsubid,
	CASE WHEN pro.proisagg = true THEN 'aggregate'::text
	     WHEN pro.proisagg = false THEN 'function'::text
	END AS objtype,
	pro.pronamespace AS objnamespace,
	CASE WHEN pg_function_is_visible(pro.oid)
	     THEN quote_ident(pro.proname)
	     ELSE quote_ident(nsp.nspname) || '.' || quote_ident(pro.proname)
	END || '(' || pg_catalog.pg_get_function_arguments(pro.oid) || ')' AS objname,
	l.provider, l.label
FROM
	pg_seclabel l
	JOIN pg_proc pro ON l.classoid = pro.tableoid AND l.objoid = pro.oid
	JOIN pg_namespace nsp ON pro.pronamespace = nsp.oid
WHERE
	l.objsubid = 0
UNION ALL
SELECT
	l.objoid, l.classoid, l.objsubid,
	CASE WHEN typ.typtype = 'd' THEN 'domain'::text
	ELSE 'type'::text END AS objtype,
	typ.typnamespace AS objnamespace,
	CASE WHEN pg_type_is_visible(typ.oid)
	THEN quote_ident(typ.typname)
	ELSE quote_ident(nsp.nspname) || '.' || quote_ident(typ.typname)
	END AS objname,
	l.provider, l.label
FROM
	pg_seclabel l
	JOIN pg_type typ ON l.classoid = typ.tableoid AND l.objoid = typ.oid
	JOIN pg_namespace nsp ON typ.typnamespace = nsp.oid
WHERE
	l.objsubid = 0
UNION ALL
SELECT
	l.objoid, l.classoid, l.objsubid,
	'large object'::text AS objtype,
	NULL::oid AS objnamespace,
	l.objoid::text AS objname,
	l.provider, l.label
FROM
	pg_seclabel l
	JOIN pg_largeobject_metadata lom ON l.objoid = lom.oid
WHERE
	l.classoid = 'pg_catalog.pg_largeobject'::regclass AND l.objsubid = 0
UNION ALL
SELECT
	l.objoid, l.classoid, l.objsubid,
	'language'::text AS objtype,
	NULL::oid AS objnamespace,
	quote_ident(lan.lanname) AS objname,
	l.provider, l.label
FROM
	pg_seclabel l
	JOIN pg_language lan ON l.classoid = lan.tableoid AND l.objoid = lan.oid
WHERE
	l.objsubid = 0
UNION ALL
SELECT
	l.objoid, l.classoid, l.objsubid,
	'schema'::text AS objtype,
	nsp.oid AS objnamespace,
	quote_ident(nsp.nspname) AS objname,
	l.provider, l.label
FROM
	pg_seclabel l
	JOIN pg_namespace nsp ON l.classoid = nsp.tableoid AND l.objoid = nsp.oid
WHERE
	l.objsubid = 0;

CREATE VIEW pg_settings AS
    SELECT * FROM pg_show_all_settings() AS A;

CREATE RULE pg_settings_u AS
    ON UPDATE TO pg_settings
    WHERE new.name = old.name DO
    SELECT set_config(old.name, new.setting, 'f');

CREATE RULE pg_settings_n AS
    ON UPDATE TO pg_settings
    DO INSTEAD NOTHING;

GRANT SELECT, UPDATE ON pg_settings TO PUBLIC;

CREATE VIEW pg_timezone_abbrevs AS
    SELECT * FROM pg_timezone_abbrevs();

CREATE VIEW pg_timezone_names AS
    SELECT * FROM pg_timezone_names();

-- Statistics views

CREATE VIEW pg_stat_all_tables AS
    SELECT
            C.oid AS relid,
            N.nspname AS schemaname,
            C.relname AS relname,
            pg_stat_get_numscans(C.oid) AS seq_scan,
            pg_stat_get_tuples_returned(C.oid) AS seq_tup_read,
            sum(pg_stat_get_numscans(I.indexrelid))::bigint AS idx_scan,
            sum(pg_stat_get_tuples_fetched(I.indexrelid))::bigint +
            pg_stat_get_tuples_fetched(C.oid) AS idx_tup_fetch,
            pg_stat_get_tuples_inserted(C.oid) AS n_tup_ins,
            pg_stat_get_tuples_updated(C.oid) AS n_tup_upd,
            pg_stat_get_tuples_deleted(C.oid) AS n_tup_del,
            pg_stat_get_tuples_hot_updated(C.oid) AS n_tup_hot_upd,
            pg_stat_get_live_tuples(C.oid) AS n_live_tup,
            pg_stat_get_dead_tuples(C.oid) AS n_dead_tup,
            pg_stat_get_last_vacuum_time(C.oid) as last_vacuum,
            pg_stat_get_last_autovacuum_time(C.oid) as last_autovacuum,
            pg_stat_get_last_analyze_time(C.oid) as last_analyze,
            pg_stat_get_last_autoanalyze_time(C.oid) as last_autoanalyze,
            pg_stat_get_vacuum_count(C.oid) AS vacuum_count,
            pg_stat_get_autovacuum_count(C.oid) AS autovacuum_count,
            pg_stat_get_analyze_count(C.oid) AS analyze_count,
            pg_stat_get_autoanalyze_count(C.oid) AS autoanalyze_count
    FROM pg_class C LEFT JOIN
         pg_index I ON C.oid = I.indrelid
         LEFT JOIN pg_namespace N ON (N.oid = C.relnamespace)
    WHERE C.relkind IN ('r', 't')
    GROUP BY C.oid, N.nspname, C.relname;

CREATE VIEW pg_stat_xact_all_tables AS
    SELECT
            C.oid AS relid,
            N.nspname AS schemaname,
            C.relname AS relname,
            pg_stat_get_xact_numscans(C.oid) AS seq_scan,
            pg_stat_get_xact_tuples_returned(C.oid) AS seq_tup_read,
            sum(pg_stat_get_xact_numscans(I.indexrelid))::bigint AS idx_scan,
            sum(pg_stat_get_xact_tuples_fetched(I.indexrelid))::bigint +
            pg_stat_get_xact_tuples_fetched(C.oid) AS idx_tup_fetch,
            pg_stat_get_xact_tuples_inserted(C.oid) AS n_tup_ins,
            pg_stat_get_xact_tuples_updated(C.oid) AS n_tup_upd,
            pg_stat_get_xact_tuples_deleted(C.oid) AS n_tup_del,
            pg_stat_get_xact_tuples_hot_updated(C.oid) AS n_tup_hot_upd
    FROM pg_class C LEFT JOIN
         pg_index I ON C.oid = I.indrelid
         LEFT JOIN pg_namespace N ON (N.oid = C.relnamespace)
    WHERE C.relkind IN ('r', 't')
    GROUP BY C.oid, N.nspname, C.relname;

CREATE VIEW pg_stat_sys_tables AS
    SELECT * FROM pg_stat_all_tables
    WHERE schemaname IN ('pg_catalog', 'information_schema') OR
          schemaname ~ '^pg_toast';

CREATE VIEW pg_stat_xact_sys_tables AS
    SELECT * FROM pg_stat_xact_all_tables
    WHERE schemaname IN ('pg_catalog', 'information_schema') OR
          schemaname ~ '^pg_toast';

CREATE VIEW pg_stat_user_tables AS
    SELECT * FROM pg_stat_all_tables
    WHERE schemaname NOT IN ('pg_catalog', 'information_schema') AND
          schemaname !~ '^pg_toast';

CREATE VIEW pg_stat_xact_user_tables AS
    SELECT * FROM pg_stat_xact_all_tables
    WHERE schemaname NOT IN ('pg_catalog', 'information_schema') AND
          schemaname !~ '^pg_toast';

CREATE VIEW pg_statio_all_tables AS
    SELECT
            C.oid AS relid,
            N.nspname AS schemaname,
            C.relname AS relname,
            pg_stat_get_blocks_fetched(C.oid) -
                    pg_stat_get_blocks_hit(C.oid) AS heap_blks_read,
            pg_stat_get_blocks_hit(C.oid) AS heap_blks_hit,
            sum(pg_stat_get_blocks_fetched(I.indexrelid) -
                    pg_stat_get_blocks_hit(I.indexrelid))::bigint AS idx_blks_read,
            sum(pg_stat_get_blocks_hit(I.indexrelid))::bigint AS idx_blks_hit,
            pg_stat_get_blocks_fetched(T.oid) -
                    pg_stat_get_blocks_hit(T.oid) AS toast_blks_read,
            pg_stat_get_blocks_hit(T.oid) AS toast_blks_hit,
            pg_stat_get_blocks_fetched(X.oid) -
                    pg_stat_get_blocks_hit(X.oid) AS tidx_blks_read,
            pg_stat_get_blocks_hit(X.oid) AS tidx_blks_hit
    FROM pg_class C LEFT JOIN
            pg_index I ON C.oid = I.indrelid LEFT JOIN
            pg_class T ON C.reltoastrelid = T.oid LEFT JOIN
            pg_class X ON T.reltoastidxid = X.oid
            LEFT JOIN pg_namespace N ON (N.oid = C.relnamespace)
    WHERE C.relkind IN ('r', 't')
    GROUP BY C.oid, N.nspname, C.relname, T.oid, X.oid;

CREATE VIEW pg_statio_sys_tables AS
    SELECT * FROM pg_statio_all_tables
    WHERE schemaname IN ('pg_catalog', 'information_schema') OR
          schemaname ~ '^pg_toast';

CREATE VIEW pg_statio_user_tables AS
    SELECT * FROM pg_statio_all_tables
    WHERE schemaname NOT IN ('pg_catalog', 'information_schema') AND
          schemaname !~ '^pg_toast';

CREATE VIEW pg_stat_all_indexes AS
    SELECT
            C.oid AS relid,
            I.oid AS indexrelid,
            N.nspname AS schemaname,
            C.relname AS relname,
            I.relname AS indexrelname,
            pg_stat_get_numscans(I.oid) AS idx_scan,
            pg_stat_get_tuples_returned(I.oid) AS idx_tup_read,
            pg_stat_get_tuples_fetched(I.oid) AS idx_tup_fetch
    FROM pg_class C JOIN
            pg_index X ON C.oid = X.indrelid JOIN
            pg_class I ON I.oid = X.indexrelid
            LEFT JOIN pg_namespace N ON (N.oid = C.relnamespace)
    WHERE C.relkind IN ('r', 't');

CREATE VIEW pg_stat_sys_indexes AS
    SELECT * FROM pg_stat_all_indexes
    WHERE schemaname IN ('pg_catalog', 'information_schema') OR
          schemaname ~ '^pg_toast';

CREATE VIEW pg_stat_user_indexes AS
    SELECT * FROM pg_stat_all_indexes
    WHERE schemaname NOT IN ('pg_catalog', 'information_schema') AND
          schemaname !~ '^pg_toast';

CREATE VIEW pg_statio_all_indexes AS
    SELECT
            C.oid AS relid,
            I.oid AS indexrelid,
            N.nspname AS schemaname,
            C.relname AS relname,
            I.relname AS indexrelname,
            pg_stat_get_blocks_fetched(I.oid) -
                    pg_stat_get_blocks_hit(I.oid) AS idx_blks_read,
            pg_stat_get_blocks_hit(I.oid) AS idx_blks_hit
    FROM pg_class C JOIN
            pg_index X ON C.oid = X.indrelid JOIN
            pg_class I ON I.oid = X.indexrelid
            LEFT JOIN pg_namespace N ON (N.oid = C.relnamespace)
    WHERE C.relkind IN ('r', 't');

CREATE VIEW pg_statio_sys_indexes AS
    SELECT * FROM pg_statio_all_indexes
    WHERE schemaname IN ('pg_catalog', 'information_schema') OR
          schemaname ~ '^pg_toast';

CREATE VIEW pg_statio_user_indexes AS
    SELECT * FROM pg_statio_all_indexes
    WHERE schemaname NOT IN ('pg_catalog', 'information_schema') AND
          schemaname !~ '^pg_toast';

CREATE VIEW pg_statio_all_sequences AS
    SELECT
            C.oid AS relid,
            N.nspname AS schemaname,
            C.relname AS relname,
            pg_stat_get_blocks_fetched(C.oid) -
                    pg_stat_get_blocks_hit(C.oid) AS blks_read,
            pg_stat_get_blocks_hit(C.oid) AS blks_hit
    FROM pg_class C
            LEFT JOIN pg_namespace N ON (N.oid = C.relnamespace)
    WHERE C.relkind = 'S';

CREATE VIEW pg_statio_sys_sequences AS
    SELECT * FROM pg_statio_all_sequences
    WHERE schemaname IN ('pg_catalog', 'information_schema') OR
          schemaname ~ '^pg_toast';

CREATE VIEW pg_statio_user_sequences AS
    SELECT * FROM pg_statio_all_sequences
    WHERE schemaname NOT IN ('pg_catalog', 'information_schema') AND
          schemaname !~ '^pg_toast';

CREATE VIEW pg_stat_activity AS
    SELECT
            S.datid AS datid,
            D.datname AS datname,
            S.procpid,
            S.usesysid,
            U.rolname AS usename,
            S.application_name,
            S.client_addr,
            S.client_port,
            S.backend_start,
            S.xact_start,
            S.query_start,
            S.waiting,
            S.current_query
    FROM pg_database D, pg_stat_get_activity(NULL) AS S, pg_authid U
    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.state,
            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,
            D.datname AS 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,
            pg_stat_get_db_stat_reset_time(D.oid) AS stats_reset
    FROM pg_database D;

CREATE VIEW pg_stat_database_conflicts AS
    SELECT
            D.oid AS datid,
            D.datname AS 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;

CREATE VIEW pg_stat_user_functions AS
    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  -- fast check to eliminate built-in functions
          AND pg_stat_get_function_calls(P.oid) IS NOT NULL;

CREATE VIEW pg_stat_xact_user_functions AS
    SELECT
            P.oid AS funcid,
            N.nspname AS schemaname,
            P.proname AS funcname,
            pg_stat_get_xact_function_calls(P.oid) AS calls,
            pg_stat_get_xact_function_time(P.oid) / 1000 AS total_time,
            pg_stat_get_xact_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  -- fast check to eliminate built-in functions
          AND pg_stat_get_xact_function_calls(P.oid) IS NOT NULL;

CREATE VIEW pg_stat_bgwriter AS
    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_get_bgwriter_stat_reset_time() AS stats_reset;

CREATE VIEW pg_user_mappings AS
    SELECT
        U.oid       AS umid,
        S.oid       AS srvid,
        S.srvname   AS srvname,
        U.umuser    AS umuser,
        CASE WHEN U.umuser = 0 THEN
            'public'
        ELSE
            A.rolname
        END AS usename,
        CASE WHEN pg_has_role(S.srvowner, 'USAGE') OR has_server_privilege(S.oid, 'USAGE') THEN
            U.umoptions
        ELSE
            NULL
        END AS umoptions
    FROM pg_user_mapping U
         LEFT JOIN pg_authid A ON (A.oid = U.umuser) JOIN
        pg_foreign_server S ON (U.umserver = S.oid);

REVOKE ALL on pg_user_mapping FROM public;

--
-- We have a few function definitions in here, too.
-- At some point there might be enough to justify breaking them out into
-- a separate "system_functions.sql" file.
--

-- Tsearch debug function.  Defined here because it'd be pretty unwieldy
-- to put it into pg_proc.h

CREATE FUNCTION ts_debug(IN config regconfig, IN document text,
    OUT alias text,
    OUT description text,
    OUT token text,
    OUT dictionaries regdictionary[],
    OUT dictionary regdictionary,
    OUT lexemes text[])
RETURNS SETOF record AS
$$
SELECT
    tt.alias AS alias,
    tt.description AS description,
    parse.token AS token,
    ARRAY ( SELECT m.mapdict::pg_catalog.regdictionary
            FROM pg_catalog.pg_ts_config_map AS m
            WHERE m.mapcfg = $1 AND m.maptokentype = parse.tokid
            ORDER BY m.mapseqno )
    AS dictionaries,
    ( SELECT mapdict::pg_catalog.regdictionary
      FROM pg_catalog.pg_ts_config_map AS m
      WHERE m.mapcfg = $1 AND m.maptokentype = parse.tokid
      ORDER BY pg_catalog.ts_lexize(mapdict, parse.token) IS NULL, m.mapseqno
      LIMIT 1
    ) AS dictionary,
    ( SELECT pg_catalog.ts_lexize(mapdict, parse.token)
      FROM pg_catalog.pg_ts_config_map AS m
      WHERE m.mapcfg = $1 AND m.maptokentype = parse.tokid
      ORDER BY pg_catalog.ts_lexize(mapdict, parse.token) IS NULL, m.mapseqno
      LIMIT 1
    ) AS lexemes
FROM pg_catalog.ts_parse(
        (SELECT cfgparser FROM pg_catalog.pg_ts_config WHERE oid = $1 ), $2
    ) AS parse,
     pg_catalog.ts_token_type(
        (SELECT cfgparser FROM pg_catalog.pg_ts_config WHERE oid = $1 )
    ) AS tt
WHERE tt.tokid = parse.tokid
$$
LANGUAGE SQL STRICT STABLE;

COMMENT ON FUNCTION ts_debug(regconfig,text) IS
    'debug function for text search configuration';

CREATE FUNCTION ts_debug(IN document text,
    OUT alias text,
    OUT description text,
    OUT token text,
    OUT dictionaries regdictionary[],
    OUT dictionary regdictionary,
    OUT lexemes text[])
RETURNS SETOF record AS
$$
    SELECT * FROM pg_catalog.ts_debug( pg_catalog.get_current_ts_config(), $1);
$$
LANGUAGE SQL STRICT STABLE;

COMMENT ON FUNCTION ts_debug(text) IS
    'debug function for current text search configuration';

--
-- Redeclare built-in functions that need default values attached to their
-- arguments.  It's impractical to set those up directly in pg_proc.h because
-- of the complexity and platform-dependency of the expression tree
-- representation.  (Note that internal functions still have to have entries
-- in pg_proc.h; we are merely causing their proargnames and proargdefaults
-- to get filled in.)
--

CREATE OR REPLACE FUNCTION
  format_type(oid, int DEFAULT NULL, oid DEFAULT NULL)
  RETURNS text STABLE LANGUAGE internal AS 'format_type';

CREATE OR REPLACE FUNCTION
  pg_start_backup(label text, fast boolean DEFAULT false)
  RETURNS text STRICT VOLATILE LANGUAGE internal AS 'pg_start_backup';