MYSQL教程详解MySQL下InnoDB引擎中的Memcached插件

MYSQL教程
shell> groupadd mysql
shell> useradd -r -g mysql mysql
shell> tar zxvf mysql-5.6.13.tar.gz
shell> cd mysql-5.6.13
shell> cmake . -DWITH_INNODB_MEMCACHED=ON
shell> make
shell> make install
shell> cd /usr/local/mysql
shell> chown -R mysql .
shell> chgrp -R mysql .
shell> scripts/mysql_install_db --user=mysql
shell> chown -R root .
shell> chown -R mysql data
shell> bin/mysqld_safe --user=mysql &
shell> cp support-files/mysql.server /etc/init.d/mysql.server

MYSQL教程
mysql> SELECT @@plugin_dir;
+------------------------------+
| @@plugin_dir         |
+------------------------------+
| /usr/local/mysql/lib/plugin/ |
+------------------------------+

此外还需要导入Memcached插件所需要的表结构：
 

MYSQL教程
mysql> SOURCE /usr/local/mysql/share/innodb_memcached_config.sql

一切就绪后就可以激活Memcached插件了(当然如果需要的话也可以禁止)：
 

MYSQL教程
mysql> INSTALL PLUGIN daemon_memcached soname "libmemcached.so";
mysql> UNINSTALL PLUGIN daemon_memcached;

说明：如果要重启插件的话,可以先uninstall,再install.

MYSQL教程
mysql> SHOW VARIABLES LIKE '%memcached%';
+----------------------------------+------------------+
| Variable_name          | Value      |
+----------------------------------+------------------+
| daemon_memcached_enable_binlog  | OFF       |
| daemon_memcached_engine_lib_name | innodb_engine.so |
| daemon_memcached_engine_lib_path |         |
| daemon_memcached_option     |         |
| daemon_memcached_r_batch_size  | 1        |
| daemon_memcached_w_batch_size  | 1        |
+----------------------------------+------------------+

注意：daemon_memcached_r_batch_size和daemon_memcached_w_batch_size,这两个选项对性能影响较大,简单点说就是控制事务提交的频率,MySQL的缺省值均为1,也就是说每次都提交,这主要是从安全性考虑的,大家可以依照自己的情况来调整.

MYSQL教程
shell> echo "stats" | nc localhost 11211

MYSQL教程
mysql> USE innodb_memcache
mysql> SHOW TABLES;
+---------------------------+
| Tables_in_innodb_memcache |
+---------------------------+
| cache_policies      |
| config_options      |
| containers        |
+---------------------------+

MYSQL教程
mysql> SELECT * FROM containers\G
*************************** 1. row ***************************
         name: aaa
       db_schema: test
       db_table: demo_test
      key_columns: c1
     value_columns: c2
         flags: c3
      cas_column: c4
  expire_time_column: c5
unique_idx_name_on_key: PRIMARY

MYSQL教程
mysql> DESC test.demo_test;
+-------+---------------------+------+-----+---------+-------+
| Field | Type        | Null | Key | Default | Extra |
+-------+---------------------+------+-----+---------+-------+
| c1  | varchar(32)     | NO  | PRI |     |    |
| c2  | varchar(1024)    | YES |   | NULL  |    |
| c3  | int(11)       | YES |   | NULL  |    |
| c4  | bigint(20) unsigned | YES |   | NULL  |    |
| c5  | int(11)       | YES |   | NULL  |    |
+-------+---------------------+------+-----+---------+-------+

MYSQL教程
mysql> SELECT * FROM test.demo_test;
+----+--------------+------+------+------+
| c1 | c2      | c3  | c4  | c5  |
+----+--------------+------+------+------+
| AA | HELLO, HELLO |  8 |  0 |  0 |
+----+--------------+------+------+------+

MYSQL教程
shell> echo "get @@aaa.AA" | nc localhost 11211
VALUE @@aaa.AA 8 12
HELLO, HELLO
END

MYSQL教程
shell> (echo "get @@aaa"; echo "get AA") | nc localhost 11211
VALUE @@aaa 0 14
test/demo_test
END
VALUE AA 8 12
HELLO, HELLO
END

MYSQL教程
USE `test`
 
CREATE TABLE `users` (
  `id` INT(10) UNSIGNED NOT NULL AUTO_INCREMENT,
  `username` VARCHAR(15) NOT NULL,
  `password` VARCHAR(32) NOT NULL,
  `email` VARCHAR(50) NOT NULL,
  `flags` INT(10) UNSIGNED DEFAULT '0',
  `cas_column` BIGINT(20) UNSIGNED DEFAULT '0',
  `expire_time_column` INT(10) UNSIGNED DEFAULT '0',
  PRIMARY KEY (`id`),
  UNIQUE KEY `username` (`username`)
) ENGINE=InnoDB;

MYSQL教程
INSERT INTO `users` (`username`, `password`, `email`)
VALUES
('foo', 'ffffffffffffffffffffffffffffffff', 'foo@domain.com'),
('bar', 'bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb', 'bar@domain.com');

MYSQL教程
INSERT INTO innodb_memcache.containers (
  name, db_schema, db_table, key_columns, value_columns,
  flags, cas_column, expire_time_column, unique_idx_name_on_key
) VALUES (
  'default', 'test', 'users', 'username', 'password|email',
  'flags', 'cas_column', 'expire_time_column', 'username'
);

MYSQL教程
static const char* sep = " ;,|\n";

MYSQL教程
shell> echo "get foo bar" | nc localhost 11211
VALUE foo 0 47
ffffffffffffffffffffffffffffffff|foo@domain.com
VALUE bar 0 47
bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb|bar@domain.com
END