libmemcached-0.34.tar.gz和memcached_functions_mysql-0.9.tar.gz，其它版本配对都有问题，我安装测试过有问题的版本有：
代码如下:
memcached_functions_mysql-1.1在：
libmemcached-0.49libmemcached-0.48libmemcached-0.47libmemcached-0.30libmemcached-0.43\libmemcached-0.42
下安装有错误
memcached_functions_mysql-0.10在：
libmemcached-0.42下安装有错误
memcached_functions_mysql-0.8在：
libmemcached-0.49libmemcached-0.48libmemcached-0.47libmemcached-0.44libmemcached-0.43
libmemcached-0.42下安装有错误
MySQL测试版本：5.1.55，操作系统Centos5.4 64bit，内存2G
安装libmemcached-0.34和memcached_functions_mysql-0.9，
代码如下:
[root@sunss24 libmemcached-0.34]#./configure
--with-memcached=/home/memcache/bin/memcached
[root@sunss24 libmemcached-0. 34]# make
[root@sunss24 libmemcached-0. 34]# make install
再运行一下memstat，算成功了
[root@sunss24 ~]# ln -s /usr/local/lib/libmemcached.so.3 /usr/lib/
[root@sunss24 ~]# cd memcached_functions_mysql-0.9
[root@sunss24 memcached_functions_mysql-0.9]# ./configure
--with-mysql=/usr/local/mysql/bin/mysql_config
--libdir=/usr/local/mysql/lib/
[root@sunss memcached_functions_mysql-0.9]# make && make install
安装完成后将UDFs加载到MySQL中：
代码如下:
mysql> show variables like "%plugin%";
+---------------+-----------------------------------+
| Variable_name | Value |
+---------------+-----------------------------------+
| plugin_dir | /usr/local/mysql/lib/mysql/plugin |
+---------------+-----------------------------------+
1 row in set (0.00 sec)
[root@sunss ~]# find / -name "libmemcached_functions_mysql.so"
/usr/local/mysql/lib/libmemcached_functions_mysql.so
/root/memcached_functions_mysql-0.9/src/.libs/libmemcached_functions_mysql.so
You have new mail in /var/spool/mail/root
[root@sunss ~]# cp /usr/local/mysql/lib/libmemcached_functions_mysql.so /usr/local/mysql/lib/mysql/plugin/
[root@sunss ~]# cd memcached_functions_mysql-0.9/
[root@sunss ~]#cd sql/
mysql> source install_functions.sql;
查看各种版本：
代码如下:
mysql> select memc_udf_version();
+--------------------+
| memc_udf_version() |
+--------------------+
| 0.9 |
+--------------------+
1 row in set (0.00 sec)
mysql> select memc_libmemcached_version();
+-----------------------------+
| memc_libmemcached_version() |
+-----------------------------+
| 0.34 |
+-----------------------------+
1 row in set (0.00 sec)
mysql>
遇到问题：
代码如下:
No package 'libmemcached' found
Consider adjusting the PKG_CONFIG_PATH environment variable if you
installed software in a non-standard prefix.
Alternatively, you may set the environment variables DEPS_CFLAGS
and DEPS_LIBS to avoid the need to call pkg-config.
See the pkg-config man page for more details.
解决办法：
[root@sunss24 memcached_functions_mysql-0.9]# whereis pkgconfig
[root@sunss24 memcached_functions_mysql-0.9]# export
PKG_CONFIG_PATH=/usr/local/lib/pkgconfig:/usr/lib/pkgconfig
导出所有memcache内容：
使用：memcached-hack.zip
效率测试：
插入：
代码如下: