不沉之月
vls's blog

在微博上看到隔壁部门的同事发布了一个介绍MySQL 5.6新特性的slide。遂对其中几个对我们业务有用的特性做了测试。

Found a slide which introducing new features in MySQL 5.6, which is made by a colleague in other department. For our business, I ran some tests on some features.

• InnoDB Compression

//压缩前(before compress)
Name: workticket
Engine: InnoDB
Version: 10
Row_format: Compact
Rows: 1471830
Avg_row_length: 328
Data_length: 483295232
Max_data_length: 0
Index_length: 260276224
Data_free: 5242880
Auto_increment: 3473533
Create_time: 2013-04-15 16:01:01
Update_time: NULL
Check_time: NULL
Collation: utf8_general_ci
Checksum: NULL
Create_options: 
Comment: 工单表

//压缩后(after compress)
Name: workticket
Engine: InnoDB
Version: 10
Row_format: Compressed
Rows: 1553544
Avg_row_length: 143
Data_length: 222281728
Max_data_length: 0
Index_length: 121192448
Data_free: 2621440
Auto_increment: 3473533
Create_time: 2013-04-15 16:06:33
Update_time: NULL
Check_time: NULL
Collation: utf8_general_ci
Checksum: NULL
Create_options: row_format=COMPRESSED
Comment: 工单表

但还是不够myisampack后的myisam省空间

But InnoDB Compression is less storage efficient than MyISAM after myisampack.

-rw-rw---- 1 mysql mysql 9.5K Apr 16 09:35 workticket.frm
-rw-rw---- 1 mysql mysql 9.5K Apr 16 09:45 workticket_innodb.frm
-rw-rw---- 1 mysql mysql 336M Apr 16 09:58 workticket_innodb.ibd
-rw-rw---- 1 mysql mysql 199M Apr 16 09:41 workticket.MYD
-rw-rw---- 1 mysql mysql  86M Apr 16 09:44 workticket.MYI

           Name: workticket
         Engine: MyISAM
        Version: 10
     Row_format: Dynamic
           Rows: 1593851
 Avg_row_length: 201
    Data_length: 321325744
Max_data_length: 281474976710655
   Index_length: 130242560
      Data_free: 0
 Auto_increment: 3473533
    Create_time: 2013-04-16 09:35:53
    Update_time: 2013-04-16 09:41:09
     Check_time: 2013-04-16 09:37:03
      Collation: utf8_general_ci
       Checksum: NULL
 Create_options: 
        Comment: 工单表

• InnoDB Online DDL

mysql> ALTER TABLE `workticket` ADD COLUMN `test_col` INT NOT NULL AFTER sid, LOCK=NONE;
Query OK, 0 rows affected (5 min 25.17 sec)
Records: 0  Duplicates: 0  Warnings: 0

mysql> set old_alter_table=1;
Query OK, 0 rows affected (0.00 sec)
mysql> ALTER TABLE `workticket` ADD COLUMN `test_col` INT NOT NULL AFTER sid, LOCK=NONE; 
ERROR 1846 (0A000): LOCK=NONE is not supported. Reason: COPY algorithm requires a lock. Try LOCK=SHARED.
mysql> ALTER TABLE `workticket` ADD COLUMN `test_col` INT NOT NULL AFTER sid, LOCK=SHARED;
Query OK, 1593851 rows affected (4 min 11.89 sec)
Records: 1593851  Duplicates: 0  Warnings: 0

虽然总体耗时更长，但DDL过程中不锁表（可query and/or 可DML）还是很吸引的（详细的DDL操作是否可query and/or 可DML可参见文档）。

Although costing more time, that the table can be query and/or execute DML query is very amazing. (Detail can be seen in documentation)

• InnoDB-Transportable Tablespaces
  没什么可测试的，就是操作成功。用途？建slave？备份？
  Nothing interesting to test. It just works. What can I do with this feature? Maybe building up a slave server? Or backup up the database?