統計greenplum_postgresql數據佔用存儲狀況

1. 場景描述

因項目數據量略大，天天大概有幾百g的存儲需求，而且是多項目公用greenplum集羣，須要按期檢查一下磁盤狀況。

2. 解決方案

2.1 按用戶/項目統計

2.1.1 SQL語句

SELECT d.datname AS Name,  pg_catalog.pg_get_userbyid(d.datdba) AS Owner,
    CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')
        THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))
        ELSE 'No Access'
    END AS SIZE
FROM pg_catalog.pg_database d
    ORDER BY
    CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')
        THEN pg_catalog.pg_database_size(d.datname)
        ELSE NULL
    END DESC -- nulls first
    LIMIT 20;

2.1.2 效果圖

2.2 按表統計

2.2.1 SQL語句

SELECT
    table_schema || '.' || table_name AS table_full_name,
    pg_size_pretty(pg_total_relation_size('"' || table_schema || '"."' || table_name || '"')) AS size
FROM information_schema.tables
ORDER BY
    pg_total_relation_size('"' || table_schema || '"."' || table_name || '"') DESC;

2.2.2 效果圖