1.查看 MySQL「所有库」的容量大小

SELECT 
table_schema as '数据库',
sum(table_rows) as '记录数',
sum(truncate(data_length/1024/1024, 2)) as '数据容量(MB)',
sum(truncate(index_length/1024/1024, 2)) as '索引容量(MB)',
sum(truncate(DATA_FREE/1024/1024, 2)) as '碎片占用(MB)',
ROUND(SUM(data_length + index_length) / 1024 / 1024/1024, 2) AS '数据库大小 (GB)'
from information_schema.tables
group by table_schema
order by sum(data_length) desc, sum(index_length) desc;