PostgreSQL查看表膨胀（对所有表进行膨胀率排序）

1、查看表膨胀（对所有表进行膨胀率排序），取前10个

SELECT
    schemaname||'.'||relname as table_name,
    pg_size_pretty(pg_relation_size(schemaname||'.'||relname)) as table_size,
    n_dead_tup,
    n_live_tup,
    round(n_dead_tup * 100 / (n_live_tup + n_dead_tup),2) AS dead_tup_ratio
FROM
    pg_stat_all_tables
WHERE
    n_dead_tup >= 1000
ORDER BY dead_tup_ratio DESC
LIMIT 10;

2、查看单张表的膨胀率

SELECT
    schemaname||'.'||relname as table_name,
    pg_size_pretty(pg_relation_size(schemaname||'.'||relname)) as table_size,
    n_dead_tup,
    n_live_tup,
    round(n_dead_tup * 100 / (n_live_tup + n_dead_tup),2) AS dead_tup_ratio
FROM
    pg_stat_all_tables
WHERE
    relname = 'table_name';