MySQL工具集openark-kit (官方网站 http://code.openark.org/forge/openark-kit)，内部包含很多小工具,在5.6之前用于实现online ddl操作，

本文以CentOS为操作系统，且默认操作系统中已经安装Python环境。

 

1.0、 安装openark-kit工具包

安装Python模块包之MySQL-python,用于使用Python连接操作MySQL使用。

yum install -y MySQL-python

RPM安装方式

获得RPM包 https://code.google.com/p/openarkkit/downloads/detail?name=openark-kit-196-1.noarch.rpm

执行命令 rpm -ivh openark-kit-196-1.noarch.rpm

TAR包安装方式

获取tar包 https://code.google.com/p/openarkkit/downloads/detail?name=openark-kit-196.tar.gz

解压tar包 tar -zxvf openark-kit-196.tar.gz -C /usr/local/openark-kit/

安装openark-kit工具 python setup.py install

 

1.1 sysbench加载数据

/u01/sysbench-0.5/sysbench/sysbench --test=/u01/sysbench-0.5/sysbench/tests/db/insert.lua --oltp-table-size=1000000 --mysql-table-engine=innodb --mysql-user=root --mysql-password=root123 --mysql-port=3306 --mysql-host=127.0.0.1 --mysql-db=replTestDB --max-requests=0 --max-time=60 --oltp-tables-count=2 --report-interval=10 --num_threads=2 prepare

/u01/sysbench-0.5/sysbench/sysbench --test=/u01/sysbench-0.5/sysbench/tests/db/insert.lua --oltp-table-size=1000000 --mysql-table-engine=innodb --mysql-user=root --mysql-password=root123 --mysql-port=3306 --mysql-host=127.0.0.1 --mysql-db=replTestDB --max-requests=0 --max-time=60 --oltp-tables-count=2 --report-interval=10 --num_threads=2 run

1.2 检查ONLINE_DDL表是否有外键触发器 有则删除

** 通过 information_schema.key_column_usage**

SELECT TRIGGER_SCHEMA,TRIGGER_NAME,EVENT_OBJECT_SCHEMA,

EVENT_OBJECT_TABLE

FROM information_schema.TRIGGERS

WHERE event_object_schema = 'replTestDB';

Select * from information_schema.key_column_usage where

Referenced_table_schema='replTestDB' and

Referenced_table_name='sbtest1';

1.3 ONLINE_DDL

cd /u01/tools/openark-kit-196/scripts/

python oak-online-alter-table -u root --ask-pass -S /u01/mysql/my3306/run/mysql.sock -d replTestDB -t sbtest1 -g new_sbtest1 -a "add last_update_time timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,add key last_update_time(last_update_time)" --sleep=300 --skip-delete-pass

1.4 ONLINE_DDL后数据校验

select count(*) from sbtest1

union all

select count(*) from new_sbtest1;

mysql> desc new_sbtest1

-> ;

+------------------+------------------+------+-----+-------------------+-----------------------------+

| Field | Type | Null | Key | Default | Extra |

+------------------+------------------+------+-----+-------------------+-----------------------------+

| id | int(10) unsigned | NO | PRI | NULL | auto_increment |

| k | int(10) unsigned | NO | MUL | 0 | |

| c | char(120) | NO | | | |

| pad | char(60) | NO | | | |

| last_update_time | timestamp | NO | MUL | CURRENT_TIMESTAMP | on update CURRENT_TIMESTAMP |

+------------------+------------------+------+-----+-------------------+-----------------------------+

5 rows in set (0.02 sec)

1.5表切换

use replTestDB;

set names utf8;

rename table sbtest1 to old_sbtest1,new_sbtest1 to sbtest1;

mysql> SELECT TRIGGER_SCHEMA,TRIGGER_NAME,EVENT_OBJECT_SCHEMA,

-> EVENT_OBJECT_TABLE

-> FROM information_schema.TRIGGERS

-> WHERE event_object_schema = 'replTestDB';

+----------------+----------------+---------------------+--------------------+

| TRIGGER_SCHEMA | TRIGGER_NAME | EVENT_OBJECT_SCHEMA | EVENT_OBJECT_TABLE |

+----------------+----------------+---------------------+--------------------+

| replTestDB | sbtest1_AI_oak | replTestDB | sbtest1 |

| replTestDB | sbtest1_AU_oak | replTestDB | sbtest1 |

| replTestDB | sbtest1_AD_oak | replTestDB | sbtest1 |

+----------------+----------------+---------------------+--------------------+

3 rows in set (0.01 sec)

drop trigger sbtest1_AI_oak;

drop trigger sbtest1_AU_oak;

drop trigger sbtest1_AD_oak;

drop table old_sbtest1;