innodb_memcache在安装之前,需要导入配置sql,配置sql位于安装目录的share目录下,文件名为innodb_memcached_config.sql,导入至
innodb_memcache在安装之前,需要导入配置sql,配置sql位于安装目录的share目录下,文件名为innodb_memcached_config.sql,导入至数据库即可。
导入完之后,我们发现多了一个数据库innodb_memcache,该库下有三个表:
cache_policies:缓存策略表
config_options:配置选项表
containers:memcache元数据容器表
1. cache_policies定义了缓存策略 三种刷新策略: innodb_only:只用InnoDB存储数据 cache-only:只用传统的Memcached引擎作存储。 caching:如果在Memcached里找不到,就查询InnoDB。 2. config_options定义了配置信息 separator 多字段组合的间隔符号,默认为| table_map_delimiter 表和键之间的间隔符,默认为. 若修改,则需要重启mysql或者是重新安装memcache插件 3. containers 定义了所有memcache中表和key的元数据信息 name:定义的名字 db_schema:表所在的数据库 db_table:需要映射的表名 key_columns:key所对应的字段名 value_columns:value所对应的字段名,可以用|来进行拼接 flags:memcache的标记 cas_column:字符串长度字段 expire_time_column:过期时间 unique_idx_name_on_key:数据库中的唯一字段索引名字 4. 其他服务器控制参数 mysql> show variables like '%memcache%'; +----------------------------------+------------------+ | Variable_name | Value | +----------------------------------+------------------+ | daemon_memcached_enable_binlog | OFF | | daemon_memcached_engine_lib_name | innodb_engine.so | | daemon_memcached_engine_lib_path | | | daemon_memcached_option | -p | | daemon_memcached_r_batch_size | 1 | | daemon_memcached_w_batch_size | 1 | +----------------------------------+------------------+ 6 rows in set (0.00 sec) 对应的参数含义如下: daemon_memcached_enable_binlog:表示memcache中set是否写入binlog daemon_memcached_option :innodb_memcache默认选项,,可以通过"-p 11222"指定端口 daemon_memcached_r_batch_size、daemon_memcached_w_batch_size:关系到memcache的写入和读取性能, 默认为1,即表示每次都从innodb文件读取和写入!可酌情更改 5. 一个例子 建表: 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; 写入数据: INSERT INTO `users` (`username`, `password`, `email`) VALUES ('test1', 'test1', 'test2@linuxidc.com'), ('test2', 'test2', 'test2@linuxidc.com'); 写入memcache元数据表: 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' ); get数据: [root@www share]# echo 'get @@default.test1'|nc localhost 11222 VALUE @@default.test1 0 19 test1|test2@linuxidc.com END [root@www share]# echo 'get @@default.test2'|nc localhost 11222 VALUE @@default.test2 0 19 test2|test2@linuxidc.com ENDinnodb_memcache之使用
innodb_memcache之安装
innodb_memcache之配置
MySQL Server 层和 InnoDB 引擎层 体系结构图
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