pt-online-schema-change 使用基础5

[root@h101 ~]# pt-online-schema-change -u root -h localhost  -pmysql  --alter='add column newid char(20)  ' --execute D=pt,t=forpttest  
No slaves found.  See --recursion-method if host h101.temp has slaves.
Not checking slave lag because no slaves were found and --check-slave-lag was not specified.
Operation, tries, wait:
  copy_rows, 10, 0.25
  create_triggers, 10, 1
  drop_triggers, 10, 1
  swap_tables, 10, 1
  update_foreign_keys, 10, 1
Altering `pt`.`forpttest`...
Creating new table...
Created new table pt._forpttest_new OK.
Altering new table...
Altered `pt`.`_forpttest_new` OK.
2015-10-23T13:53:01 Creating triggers...
2015-10-23T13:53:01 Created triggers OK.
2015-10-23T13:53:01 Copying approximately 41 rows...
2015-10-23T13:53:01 Copied rows OK.
2015-10-23T13:53:01 Swapping tables...
2015-10-23T13:53:01 Swapped original and new tables OK.
2015-10-23T13:53:01 Dropping old table...
2015-10-23T13:53:01 Dropped old table `pt`.`_forpttest_old` OK.
2015-10-23T13:53:01 Dropping triggers...
2015-10-23T13:53:01 Dropped triggers OK.
Successfully altered `pt`.`forpttest`.
[root@h101 ~]# echo $?
0
[root@h101 ~]# 

mysql> desc forpttest;
+---------+----------+------+-----+---------+-------+
| Field   | Type     | Null | Key | Default | Extra |
+---------+----------+------+-----+---------+-------+
| id      | int(6)   | NO   | PRI | 0       |       |
| name    | char(10) | YES  |     | NULL    |       |
| comment | char(10) | YES  |     | NULL    |       |
| abc     | char(10) | YES  |     | NULL    |       |
| newid   | char(20) | YES  |     | NULL    |       |
+---------+----------+------+-----+---------+-------+
5 rows in set (0.00 sec)

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