MySQL的源码安装及使用UDFs进行数据自动更新的教程

mysql/' target='_blank'>mysql的源码安装
1. 安装依赖组件

# yum install gcc gcc-c++ ncurses-devel perl -y

2. 安装cmake

# wget http://www.cmake.org/files/v2.8/cmake-2.8.12.tar.gz# tar zxvf cmake-2.8.12.tar.gz# cd cmake-2.8.12# ./bootstrap # make && make install

3. 安装bison

# wget http://ftp.gnu.org/gnu/bison/bison-3.0.2.tar.gz# tar zxvf bison-3.0.2.tar.gz# cd bison-3.0.2# ./configure# make && make install

4. 创建用户的相应目录

# groupadd MySQL# useradd -g mysql mysql# mkdir -p /data/mysql/# mkdir -p /data/mysql/data/# mkdir -p /data/mysql/log/

5. 获取mysql安装包并安装

# wget http://downloads.mysql.com/archives/mysql-5.5/mysql-5.5.24.tar.gz# tar zxvf mysql-5.5.24.tar.gz# cd mysql-5.5.24# cmake \-DCMAKE_INSTALL_PREFIX=/data/mysql \-DMYSQL_UNIX_ADDR=/data/mysql/mysql.sock \-DDEFAULT_CHARSET=utf8 \-DDEFAULT_COLLATION=utf8_general_ci \-DWITH_INNOBASE_STORAGE_ENGINE=1 \-DWITH_ARCHIVE_STORAGE_ENGINE=1 \-DWITH_BLACKHOLE_STORAGE_ENGINE=1 \-DMYSQL_DATADIR=/data/mysql/data \-DMYSQL_TCP_PORT=3306 \-DENABLE_DOWNLOADS=1# make && make install

6. 修改目录权限

# chmod +w /data/mysql/# chown -R mysql:mysql /data/mysql/# ln -s /data/mysql/lib/libmysqlclient.so.18 /usr/lib/libmysqlclient.so.18# ln -s /data/mysql/mysql.sock /tmp/mysql.sock

7. 初始化数据库

# cp -rp /data/mysql/support-files/my-medium.cnf /etc/my.cnf# cp -rp /data/mysql/support-files/mysql.server /etc/rc.d/init.d/mysqld# /data/mysql/scripts/mysql_install_db --user=mysql --defaults-file=/etc/my.cnf --basedir=/data/mysql --datadir=/data/mysql/data

8. 启动mysql服务

# chmod +x /etc/init.d/mysqld# vi /etc/init.d/mysqld -->basedir=/data/mysqldatadir=/data/mysql/data# chkconfig --add mysqld# service mysqld start

9. 完成配置

# /data/mysql/bin/mysqladmin -uroot -p password 'PASSWD'# echo "export PATH=/data/mysql/bin:$PATH" >> ~/.bash_profile # source ~/.bash_profile

UDFs实现Memcached与Mysql的自动更新

UDFs是User Defined Functions的缩写，表示MYSQL的用户定义函数，应用程序可以利用这些函数从MYSQL5.0以上版本的数据库中访问Memcached写入或者获取的数据。此外，MYSQL从5.1版本开始支持触发器，从而可以在触发器中使用UDFs直接更新Memcached的内容，这种方式降低了应用程序设计和编写的复杂性。
1.安装

wget https://launchpad.net/libmemcached/1.0/0.34/+download/libmemcached-0.34.tar.gzyum install gcc44 gcc44-c++ libstdc++44-develexport CC=/usr/bin/gcc44export CXX=/usr/bin/g++44./configure --prefix=/soft/libmemcached -disable-64bit CFLAGS="-O3 -march=i686" \--with-memcached=/root/libmemcached-1.0.7/memcachedmake && make install

wget https://launchpad.net/memcached-udfs/trunk/1.1/+download/memcached_functions_mysql-1.1.tar.gz./configure --prefix=/soft/UDFS/memcache_mysql \--with-mysql=/soft/mysql/bin/mysql_config \--libdir=/soft/mysql/lib/plugin \--with-libmemcached=/soft/UDFS/libmemcached

make && make installmysql -uroot -pmysql < /sql/install_functions.sqlmysql -uroot -pmysql -se "select name,dl from mysql.func"

select memc_servers_set('127.0.0.1:11211');//如果mysql restart，需要重新运行这句以建立与memcached之间的关系select memc_server_count();select memc_set('urls:sequence', 0);select memc_list_behaviors()\G//修改memcached参数的行为select memc_servers_behavior_set('MEMCACHED_BEHAVIOR_NO_BLOCK','1');selectmemc_servers_behavior_set('MEMCACHED_BEHAVIOR_TCP_NODELAY','1'); 

设置MEMCACHED_BEHAVIOR_NO_BLOCK为打开状态，这样在memcached出现问题时（不能连接时）数据继续插入到
mysql中，报错提示，如果不设置此值，如果memcached失败，mysql需要等到timeout才可以插入到表中。

2.测试：

drop table if exists urls;create table urls ( id int(3) not null auto_increment, url varchar(64) not null default '', primary key (id) );select memc_servers_set('localhost:11211');select memc_set('urls:sequence', 0);DELIMITER |DROP TRIGGER IF EXISTS url_mem_insert |CREATE TRIGGER url_mem_insertBEFORE INSERT ON urlsFOR EACH ROW BEGIN  SET NEW.id= memc_increment('urls:sequence');   SET @mm= memc_set(NEW.id, NEW.url);END |DROP TRIGGER IF EXISTS url_mem_update |CREATE TRIGGER url_mem_updateBEFORE UPDATE ON urlsFOR EACH ROW BEGIN  SET @mm= memc_replace(OLD.id, NEW.url);END |DROP TRIGGER IF EXISTS url_mem_delete |CREATE TRIGGER url_mem_deleteBEFORE DELETE ON urlsFOR EACH ROW BEGIN  SET @mm= memc_delete(OLD.id);END |DELIMITER ;insert into urls (url) value ('http://google.com');insert into urls (url) value ('http://lycos.com/');insert into urls (url) value ('http://tripod.com/');insert into urls (url) value ('http://microsoft.com/');insert into urls (url) value('http://slashdot.org');insert into urls (url) value ('http://mysql.com');select * from urls;select memc_get('urls:1');select memc_get('urls:2');select memc_get('urls:3');select memc_get('urls:4');select memc_get('urls:5');select memc_get('urls:6');update urls set url= 'http://mysql.com/sun' where url = 'http://mysql.com';select url from urls where url = 'http://mysql.com/sun';select memc_get('urls:6');delete from urls where url = 'http://microsoft.com/';select * from urls where url='http://microsoft.com/';select memc_get('urls:4');