1.用oak对表sbtest1做添加字段和增加索引的Online DDL
openark kit 提供一组小程序，用来帮助日常的 MySQL 维护任务，可代替繁杂的手工操作。
包括：
oak-apply-ri: apply referential integrity on two columns with parent-child relationship.
oak-block-account: block or release MySQL users accounts, disabling them or enabling them to login.
oak-chunk-update: Perform long, non-blocking UPDATE/DELETE operation in auto managed small chunks.
oak-kill-slow-queries: terminate long running queries.
oak-modify-charset: change the character set (and collation) of a textual column.
oak-online-alter-table: Perform a non-blocking ALTER TABLE operation.
oak-purge-master-logs: purge master logs, depending on the state of replicating slaves.
oak-security-audit: audit accounts, passwords, privileges and other security settings.
oak-show-limits: show AUTO_INCREMENT “free space”.
oak-show-replication-status: show how far behind are replicating slaves on a given master.
原文链接: http://www.oschina.net/p/openark-kit
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 安装 oak
cd /u01/tools
tar -xzvf openark-kit-196.tar.gz
cd openark-kit-196
#安装时报错 ImportError: No module named MySQLdb
yum install MySQL-python
1.3 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';
1.4 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
1.5 ONLINE_DDL后数据校验
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)
mysql> select count(1) from new_sbtest1
-> ;
+----------+
| count(1) |
+----------+
| 991001 |
+----------+
1 row in set (0.36 sec)
mysql> select count(1) from sbtest1
-> ;
+----------+
| count(1) |
+----------+
| 991001 |
+----------+
1 row in set (0.36 sec)
1.6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;