[root@BJ-ECS-XHM-TEST-YL-19 bin]# ./pt-online-schema-change --user=checksums --password=checksums --recursion-method="processlist" --alter="add column birth3 int" h=10.50.12.33,P=3336,D=gaoquan,t=t1 --execut
Found 2 slaves:
BJ-ECS-XHM-TEST-YL-21.domain.com
BJ-ECS-XHM-TEST-YL-20.domain.com
Will check slave lag on:
BJ-ECS-XHM-TEST-YL-21.domain.com
BJ-ECS-XHM-TEST-YL-20.domain.com
Operation, tries, wait:
analyze_table, 10, 1
copy_rows, 10, 0.25
create_triggers, 10, 1
drop_triggers, 10, 1
swap_tables, 10, 1
update_foreign_keys, 10, 1
Altering `gaoquan`.`t1`...
Creating new table...
Created new table gaoquan._t1_new OK.
Waiting forever for new table `gaoquan`.`_t1_new` to replicate to BJ-ECS-XHM-TEST-YL-20.domain.com...
Altering new table...
Altered `gaoquan`.`_t1_new` OK.
2015-12-28T15:13:58 Creating triggers...
2015-12-28T15:13:58 Created triggers OK.
2015-12-28T15:13:58 Copying approximately 4 rows...
2015-12-28T15:13:58 Copied rows OK.
2015-12-28T15:13:58 Analyzing new table...
2015-12-28T15:13:58 Swapping tables...
2015-12-28T15:13:58 Swapped original and new tables OK.
2015-12-28T15:13:58 Dropping old table...
2015-12-28T15:13:58 Dropped old table `gaoquan`.`_t1_old` OK.
2015-12-28T15:13:58 Dropping triggers...
2015-12-28T15:13:58 Dropped triggers OK.
Successfully altered `gaoquan`.`t1`.
percona-toolkit之pt-online-schema-change在线修改表结构
原文：http://gaoquan.blog.51cto.com/4503718/1729168