小编Gun*_*jan的帖子

是否可以像普通表一样获得 TOAST 表的死/活元组数？

CREATE TABLE messages1 (message text);

INSERT INTO messages1
SELECT (SELECT 
        string_agg(chr(floor(random() * 26)::int + 65), '')
        FROM generate_series(1,10000)) 
FROM generate_series(1,10);

SELECT reltoastrelid::regclass 
 FROM pg_class 
 WHERE relname = 'messages1';

 DELETE FROM messages1
WHERE ctid IN (
    SELECT ctid
    FROM messages1
    ORDER BY 1
    LIMIT 6
);

postgres=# SELECT reltoastrelid::regclass 
postgres-#  FROM pg_class 
postgres-#  WHERE relname = 'messages1';
      reltoastrelid       
--------------------------
 pg_toast.pg_toast_147777
(1 row)


postgres=# select relname, vacuum_count, n_tup_del, n_live_tup, n_dead_tup from pg_stat_user_tables where relname='pg_toast.pg_toast_147777';
 relname | vacuum_count | n_tup_del …