MemSQL 入门体验小记

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> show tables;

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

| Tables_in_chris001 |

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

| tab001 |

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

1 row in set (0.00 sec)

memsql> desc tab001;

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

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

| id | int(11) | NO | PRI | 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> 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：

Intel Core i3 or better processor
At least 8GB RAM

注：测试时RAM没有8G会有警告，不影响使用。

MemSQL 入门体验小记

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