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Filename : system_views.sql
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/*
 * PostgreSQL System Views
 *
 * Copyright (c) 1996-2012, 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 = 1 THEN stavalues1
            WHEN stakind2 = 1 THEN stavalues2
            WHEN stakind3 = 1 THEN stavalues3
            WHEN stakind4 = 1 THEN stavalues4
            WHEN stakind5 = 1 THEN stavalues5
        END AS most_common_vals,
        CASE
            WHEN stakind1 = 1 THEN stanumbers1
            WHEN stakind2 = 1 THEN stanumbers2
            WHEN stakind3 = 1 THEN stanumbers3
            WHEN stakind4 = 1 THEN stanumbers4
            WHEN stakind5 = 1 THEN stanumbers5
        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
            WHEN stakind5 = 2 THEN stavalues5
        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]
            WHEN stakind5 = 3 THEN stanumbers5[1]
        END AS correlation,
        CASE
            WHEN stakind1 = 4 THEN stavalues1
            WHEN stakind2 = 4 THEN stavalues2
            WHEN stakind3 = 4 THEN stavalues3
            WHEN stakind4 = 4 THEN stavalues4
            WHEN stakind5 = 4 THEN stavalues5
        END AS most_common_elems,
        CASE
            WHEN stakind1 = 4 THEN stanumbers1
            WHEN stakind2 = 4 THEN stanumbers2
            WHEN stakind3 = 4 THEN stanumbers3
            WHEN stakind4 = 4 THEN stanumbers4
            WHEN stakind5 = 4 THEN stanumbers5
        END AS most_common_elem_freqs,
        CASE
            WHEN stakind1 = 5 THEN stanumbers1
            WHEN stakind2 = 5 THEN stanumbers2
            WHEN stakind3 = 5 THEN stanumbers3
            WHEN stakind4 = 5 THEN stanumbers4
            WHEN stakind5 = 5 THEN stanumbers5
        END AS elem_count_histogram
    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.default_version, X.extversion AS installed_version,
           E.comment
      FROM pg_available_extensions() AS E
           LEFT JOIN pg_extension AS X ON E.name = X.extname;

CREATE VIEW pg_available_extension_versions AS
    SELECT E.name, E.version, (X.extname IS NOT NULL) AS installed,
           E.superuser, E.relocatable, E.schema, E.requires, E.comment
      FROM pg_available_extension_versions() AS E
           LEFT JOIN pg_extension AS X
             ON E.name = X.extname AND E.version = X.extversion;

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
UNION ALL
SELECT
	l.objoid, l.classoid, 0::int4 AS objsubid,
	'database'::text AS objtype,
	NULL::oid AS objnamespace,
	quote_ident(dat.datname) AS objname,
	l.provider, l.label
FROM
	pg_shseclabel l
	JOIN pg_database dat ON l.classoid = dat.tableoid AND l.objoid = dat.oid
UNION ALL
SELECT
	l.objoid, l.classoid, 0::int4 AS objsubid,
	'tablespace'::text AS objtype,
	NULL::oid AS objnamespace,
	quote_ident(spc.spcname) AS objname,
	l.provider, l.label
FROM
	pg_shseclabel l
	JOIN pg_tablespace spc ON l.classoid = spc.tableoid AND l.objoid = spc.oid
UNION ALL
SELECT
	l.objoid, l.classoid, 0::int4 AS objsubid,
	'role'::text AS objtype,
	NULL::oid AS objnamespace,
	quote_ident(rol.rolname) AS objname,
	l.provider, l.label
FROM
	pg_shseclabel l
	JOIN pg_authid rol ON l.classoid = rol.tableoid AND l.objoid = rol.oid;

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.pid,
            S.usesysid,
            U.rolname AS usename,
            S.application_name,
            S.client_addr,
            S.client_hostname,
            S.client_port,
            S.backend_start,
            S.xact_start,
            S.query_start,
            S.state_change,
            S.waiting,
            S.state,
            S.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.pid,
            S.usesysid,
            U.rolname AS usename,
            S.application_name,
            S.client_addr,
            S.client_hostname,
            S.client_port,
            S.backend_start,
            W.state,
            W.sent_location,
            W.write_location,
            W.flush_location,
            W.replay_location,
            W.sync_priority,
            W.sync_state
    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.pid = W.pid;

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_temp_files(D.oid) AS temp_files,
            pg_stat_get_db_temp_bytes(D.oid) AS temp_bytes,
            pg_stat_get_db_deadlocks(D.oid) AS deadlocks,
            pg_stat_get_db_blk_read_time(D.oid) AS blk_read_time,
            pg_stat_get_db_blk_write_time(D.oid) AS blk_write_time,
            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_total_time(P.oid) AS total_time,
            pg_stat_get_function_self_time(P.oid) 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_total_time(P.oid) AS total_time,
            pg_stat_get_xact_function_self_time(P.oid) 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_checkpoint_write_time() AS checkpoint_write_time,
        pg_stat_get_checkpoint_sync_time() AS checkpoint_sync_time,
        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 (U.umuser <> 0 AND A.rolname = current_user
                     AND (pg_has_role(S.srvowner, 'USAGE')
                          OR has_server_privilege(S.oid, 'USAGE')))
                    OR (U.umuser = 0 AND pg_has_role(S.srvowner, 'USAGE'))
                    OR (SELECT rolsuper FROM pg_authid WHERE rolname = current_user)
                    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
  pg_start_backup(label text, fast boolean DEFAULT false)
  RETURNS text STRICT VOLATILE LANGUAGE internal AS 'pg_start_backup';