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MemSQL 入门体验小记 - Where IT & Bioinformatics & Math Happens

MemSQL 入门体验小记

1 看到MemSQL  的介绍后,花了几分钟浏览网站,阅读getting started并下载安装启动,在此小记。

2 MemSQL      http://memsql.com/ 

   其宣传Slogan 是 THE WORLD'S FASTEST DATABASE.YOUR DATA. ACCELERATED.  

   我们看到最多的中文介绍是  “由前Facebook工程师创办的MemSQL,号称世界上最快的分布式关系型数据库,兼容MySQL但快30倍,能实现每秒150万次事务。原理是仅用内存并将SQL预编译为C++。”


3  如何开始?

http://developers.memsql.com/docs/1b/guides/starting.html 

- 点击右上角的下载链接  http://www.memsql.com/#download  ,它会要求你提供email等信息,提交后返回一个license key和下载链接,我们下载developer版的即可。

- 安装 

$ tar -xzf memsqlbin_amd64.tar.gz
$ cd memsqlbin

- 启动 

$ ./check_system
$ ./memsqld

注:

- check_system会告诉系统是否满足需求,比如内核版本,OS版本,64位 等等 

- 启动的时候,要加 -u root,否则会报fatal错误;如果你已经有mysql在运行,那么可能需要更改默认启动端口3306为其他端口,比如 3307

./memsqld -u root --port 3307

- 如果你的RAM没有8G,启动的时候会有警告,但可以忽略。 

- 测试 

$ mysql -u root -h 127.0.0.1 -P 3306 --prompt="memsql> "

注: 这里-h不要使用localhost,用 127.0.0.1 

进入命令行后就是标准的mysql客户端了。

memsql> show databases;

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

| Database           |

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

| information_schema |

| memsql             |

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

2 rows in set (0.00 sec)

建库: 

memsql> create database chris001;

Query OK, 0 rows affected (0.08 sec)

memsql> show databases;          

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

| Database           |

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

| information_schema |

| memsql             |

| chris001           |

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

3 rows in set (0.00 sec)

建表: 

memsql> use chris001;

Database changed

memsql> 

memsql> create table tab001 (id int primary key, name varchar(100), memo varchar(200),num int);

Query OK, 0 rows affected (6.71 sec)

memsql> 

memsql> 

memsql> show tables;

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

| Tables_in_chris001 |

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

| tab001             |

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

1 row in set (0.00 sec)

memsql> desc tab001;

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

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

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

| id    | int(11)      | NO   | PRI | NULL    |       |

| name  | varchar(100) | YES  |     | NULL    |       |

| memo  | varchar(200) | YES  |     | NULL    |       |

| num   | int(11)      | YES  |     | NULL    |       |

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

4 rows in set (0.00 sec)

插入数据后查询: 

memsql> insert into tab001 values (1,'chris','xxx',100);

Query OK, 1 row affected (1.82 sec)

memsql> 

memsql> 

memsql> select * from tab001;

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

| id | name  | memo | num  |

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

|  1 | chris | xxx  |  100 |

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

1 row in set (0.71 sec)

memsql> select * from tab001;

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

| id | name  | memo | num  |

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

|  1 | chris | xxx  |  100 |

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

1 row in set (0.00 sec)

memsql> select * from tab001;

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

| id | name  | memo | num  |

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

|  1 | chris | xxx  |  100 |

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

1 row in set (0.00 sec)

memsql> select * from tab001;

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

| id | name  | memo | num  |

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

|  1 | chris | xxx  |  100 |

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

1 row in set (0.00 sec)

memsql> select count(0) from tab001; 

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

| count(0) |

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

|        1 |

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

1 row in set (0.63 sec)

memsql> 

memsql> select count(0) from tab001;

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

| count(0) |

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

|        1 |

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

1 row in set (0.00 sec)

memsql> select count(0) from tab001;

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

| count(0) |

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

|        1 |

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

1 row in set (0.00 sec)

查询的时候,服务端会打出日志:

136674795 2012-06-19 10:02:31 INFO: Table chris001.tab001 compiled in 6709 miliseconds (3185 miliseconds for header)

136678436 2012-06-19 10:02:31 INFO: Table chris001.tab001 row size 80 bytes (base overhead 32 bytes, column id 4 bytes, column name 12 bytes, column memo 12 bytes, column num 8 bytes)

186966810 2012-06-19 10:03:21 INFO: Query chris001.'insert into tab001 values (?,?,?,?)' compiled in 1825 miliseconds

194366714 2012-06-19 10:03:29 INFO: Query chris001.'select * from tab001' compiled in 712 miliseconds

283342115 2012-06-19 10:04:58 INFO: Query chris001.'select count(0) from tab001' compiled in 632 miliseconds

从以上测试我们看到,两次查询的首次和之后时间对比:

select * from tab001;                 (0.71 sec)       (0.00 sec)  

select count(0) from tab001;     (0.63 sec)        (0.00 sec) 

从日志可以知道,首次查询的耗时基本全都花在编译上了  。 

- 关闭 

$ killall memsqld

4 总结  

引用 MemSQL 网站的介绍 

MemSQL 写道

MemSQL places data into memory and translates SQL into C++ for the utmost optimization in query execution. This enables MemSQL to write and read data at incredible speeds, and by offering a relational interface, you can unify the data you’d normally store in a short-lived medium—cache or key-value store—and place it directly into a database along with your existing data.

附: 软硬件要求

支持的部署环境,必须 64位 

Distribution Minimum Version Command

Amazon AMI 2012.03 sudo yum install gcc-c++
CentOS 6.0 sudo yum install gcc-c++
Debian 6.0 sudo apt-get install g++
Fedora 15 sudo yum install gcc-c++
OpenSUSE 11.3 sudo zypper install gcc-c++
Red Hat 6.1 sudo yum install gcc-c++
Ubuntu 10.04 sudo apt-get install g++

硬件: