1.檢視所有資料庫容量大小

select
    table_schema as '資料庫',
    sum(table_rows) as '記錄數',
    sum(truncate(data_length/1024/1024, 2)) as '資料容量(MB)',
    sum(truncate(index_length/1024/1024, 2)) as '索引容量(MB)'
from information_schema.tables
group by table_schema
order by sum(data_length) desc, sum(index_length) desc;

效果圖：

2.檢視所有資料庫各表容量大小

select
        table_schema as '資料庫',
        table_name as '表名',
        table_rows as '記錄數',
        truncate(data_length/1024/1024, 2) as '資料容量(MB)',
        truncate(index_length/1024/1024, 2) as '索引容量(MB)'
from information_schema.tables
order by data_length desc, index_length desc
 
;

效果圖：

3.檢視指定資料庫容量大小

select
        table_schema as '資料庫',
        sum(table_rows) as '記錄數',
        sum(truncate(data_length/1024/1024, 2)) as '資料容量(MB)',
        sum(truncate(index_length/1024/1024, 2)) as '索引容量(MB)'
from information_schema.tables
where table_schema='mysql';-- 檢視mysql庫容量大小

效果圖：

4.檢視指定資料庫各表容量大小

select
        table_schema as '資料庫',
        table_name as '表名',
        table_rows as '記錄數',
        truncate(data_length/1024/1024, 2) as '資料容量(MB)',
        truncate(index_length/1024/1024, 2) as '索引容量(MB)'
from information_schema.tables
where table_schema='mysql' -- 檢視mysql庫各表容量大小
order by data_length desc, index_length desc;

效果圖：