《MYSQL数据库mysql中使用UDF自动同步memcached效率笔记》要点：
本文介绍了MYSQL数据库mysql中使用UDF自动同步memcached效率笔记，希望对您有用。如果有疑问，可以联系我们。
相关主题：memcache扩展 / 键值KeyValue存储数据库
接上篇：mysql使用mysql-udf-http效率测试笔记 ,这次不使用rest架构,而是使用：libmemcached和memcached_functions_mysql,测试版本是：
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-0.49\libmemcached-0.48\libmemcached-0.47\libmemcached-0.30\libmemcached-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-0.49\libmemcached-0.48\libmemcached-0.47\libmemcached-0.44\libmemcached-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:
<?php
include_once("gettime.php");
$btime = getmicrotime();
$i = 0;
$mem = new Memcache();
$mem->addServer('192.168.0.10', 11212);
$local_db = mysql_connect("192.168.0.208", "sunss", "123456");
if(!$local_db)
{
die('Could not connect: '.mysql_error());
}
$local_db_sel = mysql_select_db("test", $local_db);
mysql_query("set names utf8", $local_db);
while ( $i < 1000) {
$re_sql = "insert into urls (id,url) values ($i, 'www.gongchang.com')";
$res = mysql_query($re_sql, $local_db);
$i++;
}
mysql_close($local_db);
$etime = getmicrotime();
$runTime = round($etime - $btime, 4);
echo "runTime: ".$runTime."\r\n";
?>
1000条,插入时间：runTime: 1.4072
删除：
代码如下:
<?php
include_once("gettime.php");
$btime = getmicrotime();
$i = 0;
$mem = new Memcache();
$mem->addServer('192.168.0.10', 11212);
$local_db = mysql_connect("192.168.0.208", "sunss", "123456");
if(!$local_db)
{
die('Could not connect: '.mysql_error());
}
$local_db_sel = mysql_select_db("test", $local_db);
mysql_query("set names utf8", $local_db);
while ( $i < 1000) {
//$re_sql = "insert into urls (id,url) values ($i, 'www.gongchang.com')";
$re_sql = "delete from urls where id=".$i;
//echo "re_sql_1: ".$re_sql."\n";
$res = mysql_query($re_sql, $local_db);
$i++;
}
mysql_close($local_db);
$etime = getmicrotime();
$runTime = round($etime - $btime, 4);
echo "runTime: ".$runTime."\r\n";
?>
删除1000条,运行时间：runTime: 1.5534
更新未作
结论：每秒query大概650条记录,比上次的mysql-udf-http快多了
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