记录一次Mysql大表排查常用SQL记录

查看数据库的行数和空间大小

select
table_schema as '数据库',
sum(table_rows) as '记录数',
sum(truncate(data_length/1024/1024/1024, 2)) as '数据容量(GB)',
sum(truncate(index_length/1024/1024/1024, 2)) as '索引容量(GB)'
from information_schema.tables
group by table_schema
order by sum(data_length) desc, sum(index_length) desc;

查看数据库内部表的大小

select
table_schema as '数据库',
table_name as '表名',
table_rows as '记录数',
truncate(data_length/1024/1024/1024, 2) as '数据容量(GB)',
truncate(index_length/1024/1024/1024, 2) as '索引容量(GB)'
from information_schema.tables
order by data_length desc, index_length desc;

查看具体表的大小

select
table_schema as '数据库',
table_name as '表名',
table_rows as '记录数',
truncate(data_length/1024/1024, 2) as '数据容量(MB)',
truncate(index_length/1024/1024, 2) as '索引容量(MB)'
from information_schema.tables
where table_name = 't_caf_salesboard'

查看表最近更新时间是什么时候

SELECT 
`TABLE_NAME`, CREATE_TIME, `UPDATE_TIME` ,CHECK_TIME
FROM 
`information_schema`.`TABLES` 
WHERE 
`information_schema`.`TABLES`.`TABLE_SCHEMA` = 'xxxxdb' 
order by `UPDATE_TIME` asc

查看表的索引信息

show indexes from caf_tbyh_jbcxqd