Mysql 批量杀死进程
正常情况下kill id，即可，但是有时候某一异常连接特别多的时候如此操作会让人抓狂，下面记录下小方法：
use information_schema; select concat('kill ',id,';') from processlist where host like '192.168.0.1%' into outfile '/tmp/kill.sql'; 函数 字段 ip地址 source /tmp/kill.sql
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1.查看所有数据库容量大小
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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)'
from
information_schema.tables
group
by
table_schema
order
by
sum(data_length) desc, sum(index_length) desc;
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2.查看所有数据库各表容量大小
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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
order
by
data_length desc, index_length desc;
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3.查看指定数据库容量大小
例：查看mysql库容量大小
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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)'
from
information_schema.tables
where
table_schema=
'mysql'
;
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4.查看指定数据库各表容量大小
例：查看mysql库各表容量大小
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|
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_schema=
'mysql'
order
by
data_length desc, index_length desc;
|
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Mysql 备份单表数据
DROP TABLE IF EXISTS B;
CREATE TABLE B LIKE A;
INSERT INTO B SELECT * FROM A;
Mysql 统计表的行数
# mysqlshow -uroot -p mysql -v -v 统计mysql数据库所有表的列数和行数 select count(*) from B.t1 统计B数据库t1表的行数
Mysql 插入一个字段 id自增并设置为主键
alter table t1 ADD id INT(16) NOT NULL PRIMARY KEY AUTO_INCREMENT first;