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mysql.performance.xml
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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook XML V5.0//EN"
"/usr/share/xml/docbook/schema/dtd/4.5/docbookx.dtd" [
<!ENTITY article.author.xml SYSTEM "../common/article.author.xml">
<!ENTITY book.info.legalnotice.xml SYSTEM "../common/book.info.legalnotice.xml">
<!ENTITY book.info.abstract.xml SYSTEM "../common/book.info.abstract.xml">
]>
<article xml:base="http://netkiller.github.io/journal/"
xmlns="http://docbook.org/ns/docbook" xml:lang="zh-cn">
<articleinfo>
<title>MySQL性能调整</title>
<subtitle></subtitle>
&article.author.xml;
&book.info.legalnotice.xml;
<abstract>
</abstract>
&book.info.abstract.xml;
<keywordset>
<keyword></keyword>
<keyword></keyword>
<keyword></keyword>
<keyword></keyword>
</keywordset>
<pubdate>$Date$</pubdate>
<release>$Id$</release>
</articleinfo>
<section>
<title>系统部分</title>
<para>max_connections</para>
<screen>
<![CDATA[
mysql> show variables like '%connections%';
+----------------------+-------+
| Variable_name | Value |
+----------------------+-------+
| max_connections | 4096 |
| max_user_connections | 0 |
+----------------------+-------+
2 rows in set (0.00 sec)
]]>
</screen>
<para>connect_timeout</para>
<screen>
<![CDATA[
mysql> show variables like '%timeout%';
+-----------------------------+----------+
| Variable_name | Value |
+-----------------------------+----------+
| connect_timeout | 10 |
| delayed_insert_timeout | 300 |
| innodb_flush_log_at_timeout | 1 |
| innodb_lock_wait_timeout | 50 |
| innodb_rollback_on_timeout | OFF |
| interactive_timeout | 30 |
| lock_wait_timeout | 31536000 |
| net_read_timeout | 30 |
| net_write_timeout | 60 |
| rpl_stop_slave_timeout | 31536000 |
| slave_net_timeout | 3600 |
| wait_timeout | 30 |
+-----------------------------+----------+
12 rows in set (0.00 sec)
]]>
</screen>
<section>
<title>关于 Sleep 进程</title>
<screen>
<![CDATA[
mysql> show processlist;
+----+------+-----------------+-----------------+---------+------+-------+------------------+
| Id | User | Host | db | Command | Time | State | Info |
+----+------+-----------------+-----------------+---------+------+-------+------------------+
| 5 | app | 127.0.0.1:35551 | app.example.com | Sleep | 4444 | | NULL |
| 6 | app | 127.0.0.1:35552 | app.example.com | Sleep | 4444 | | NULL |
| 7 | app | 127.0.0.1:35554 | app.example.com | Sleep | 4444 | | NULL |
| 8 | app | 127.0.0.1:35556 | app.example.com | Sleep | 4444 | | NULL |
| 9 | app | 127.0.0.1:35555 | app.example.com | Sleep | 4444 | | NULL |
| 10 | app | 127.0.0.1:35557 | app.example.com | Sleep | 4444 | | NULL |
| 11 | app | 127.0.0.1:35558 | app.example.com | Sleep | 4444 | | NULL |
| 12 | app | 127.0.0.1:35559 | app.example.com | Sleep | 4444 | | NULL |
| 13 | app | 127.0.0.1:35560 | app.example.com | Sleep | 4444 | | NULL |
| 14 | app | 127.0.0.1:35561 | app.example.com | Sleep | 35 | | NULL |
| 15 | app | 127.0.0.1:35562 | app.example.com | Sleep | 4439 | | NULL |
| 16 | app | 127.0.0.1:35563 | app.example.com | Sleep | 4439 | | NULL |
| 17 | app | 127.0.0.1:35565 | app.example.com | Sleep | 4439 | | NULL |
| 18 | app | 127.0.0.1:35566 | app.example.com | Sleep | 4439 | | NULL |
| 19 | app | 127.0.0.1:35567 | app.example.com | Sleep | 4439 | | NULL |
| 20 | app | 127.0.0.1:35568 | app.example.com | Sleep | 4439 | | NULL |
| 21 | app | 127.0.0.1:35569 | app.example.com | Sleep | 4439 | | NULL |
| 22 | app | 127.0.0.1:35570 | app.example.com | Sleep | 4439 | | NULL |
| 23 | app | 127.0.0.1:35571 | app.example.com | Sleep | 4439 | | NULL |
| 24 | app | 127.0.0.1:35572 | app.example.com | Sleep | 38 | | NULL |
| 25 | app | 127.0.0.1:35575 | app.example.com | Sleep | 4432 | | NULL |
| 26 | app | 127.0.0.1:35576 | app.example.com | Sleep | 4432 | | NULL |
| 27 | app | 127.0.0.1:35578 | app.example.com | Sleep | 4432 | | NULL |
| 28 | app | 127.0.0.1:35579 | app.example.com | Sleep | 4432 | | NULL |
| 29 | app | 127.0.0.1:35580 | app.example.com | Sleep | 4432 | | NULL |
| 30 | app | 127.0.0.1:54330 | app.example.com | Sleep | 10 | | NULL |
| 31 | app | 127.0.0.1:1081 | app.example.com | Query | 0 | init | show processlist |
+----+------+-----------------+-----------------+---------+------+-------+------------------+
27 rows in set (0.09 sec)
mysql>
]]>
</screen>
<screen>
show variables where variable_name in ('wait_timeout','interactive_timeout')
</screen>
<para>与Sleep线程有关的配置 'wait_timeout'与'interactive_timeout'默认是8小时，也就是说Sleep 8小时才会关闭，如果你的服务器访问量很低，可以适当加快线程回收。</para>
<screen>
<![CDATA[
mysql> show variables where variable_name in ('wait_timeout','interactive_timeo
ut');
+---------------------+-------+
| Variable_name | Value |
+---------------------+-------+
| interactive_timeout | 28800 |
| wait_timeout | 28800 |
+---------------------+-------+
2 rows in set (0.47 sec)
]]>
</screen>
<para>另外PHP与Java两个群体在数据库处理上不同。PHP主张块连接快释放，让出更多的资源给其他服务。而Java多采用连接池独占数据库资源，连接池设置多少连接数就对应数据库创建多少持久连接，所以你会看到你并没有访问数据库但show processlist;会看到很多Sleep连接。</para>
<para>两个群起所采用的方式，并无好坏，都能达到最终目的。但使用连接池需要注意当MySQL最大连接数等于连接池连接数时来自其他服务器的请求将无法连接。</para>
</section>
</section>
<section>
<title>线程部分</title>
<screen>
<![CDATA[
mysql> show variables like '%thread_handling%';
+-----------------+---------------------------+
| Variable_name | Value |
+-----------------+---------------------------+
| thread_handling | one-thread-per-connection |
+-----------------+---------------------------+
1 row in set (0.01 sec)
mysql> show status like 'thread%';
+-------------------+-------+
| Variable_name | Value |
+-------------------+-------+
| Threads_cached | 16 |
| Threads_connected | 8 |
| Threads_created | 24 |
| Threads_running | 2 |
+-------------------+-------+
4 rows in set (0.00 sec)
thread_cache_hit=(connections-thread_created)/connections*100%
开启 pool-of-threads 模式
]]>
</screen>
</section>
<section>
<title>查询缓存部分</title>
<para>查看缓存设置</para>
<screen>
<![CDATA[
mysql> show variables like '%query_cache%';
+------------------------------+----------+
| Variable_name | Value |
+------------------------------+----------+
| have_query_cache | YES |
| query_cache_limit | 1048576 |
| query_cache_min_res_unit | 4096 |
| query_cache_size | 16777216 |
| query_cache_type | OFF |
| query_cache_wlock_invalidate | OFF |
+------------------------------+----------+
6 rows in set (0.01 sec)
]]>
</screen>
<para>查看缓存状态</para>
<screen>
<![CDATA[
mysql> show status like '%Qcache%';
+-------------------------+----------+
| Variable_name | Value |
+-------------------------+----------+
| Qcache_free_blocks | 1 |
| Qcache_free_memory | 16759680 |
| Qcache_hits | 0 |
| Qcache_inserts | 0 |
| Qcache_lowmem_prunes | 0 |
| Qcache_not_cached | 192 |
| Qcache_queries_in_cache | 0 |
| Qcache_total_blocks | 1 |
+-------------------------+----------+
8 rows in set (0.00 sec)
]]>
</screen>
</section>
<section>
<title>缓冲区部分</title>
<screen>
<![CDATA[
mysql> show variables like '%sort_buffer_size%';
+-------------------------+---------+
| Variable_name | Value |
+-------------------------+---------+
| innodb_sort_buffer_size | 1048576 |
| myisam_sort_buffer_size | 8388608 |
| sort_buffer_size | 262144 |
+-------------------------+---------+
3 rows in set (0.00 sec)
]]>
</screen>
</section>
<section>
<title>部分</title>
<screen>
<![CDATA[
mysql> show variables like '%low_priority_updates%';
+----------------------+-------+
| Variable_name | Value |
+----------------------+-------+
| low_priority_updates | OFF |
+----------------------+-------+
1 row in set (0.00 sec)
mysql> show variables like 'low_priority_updates';
+----------------------+-------+
| Variable_name | Value |
+----------------------+-------+
| low_priority_updates | OFF |
+----------------------+-------+
1 row in set (0.01 sec)
mysql> set global low_priority_updates=ON;
Query OK, 0 rows affected (0.00 sec)
mysql> exit
]]>
</screen>
<para>global变量需要退出重新进入才能生效。</para>
<screen>
<![CDATA[
mysql> show variables like 'low_priority_updates';
+----------------------+-------+
| Variable_name | Value |
+----------------------+-------+
| low_priority_updates | ON |
+----------------------+-------+
1 row in set (0.01 sec)
]]>
</screen>
<para>SESSION 会立即生效</para>
<screen>
<![CDATA[
mysql> set session low_priority_updates=ON;
Query OK, 0 rows affected (0.00 sec)
mysql> show variables like 'low_priority_updates';
+----------------------+-------+
| Variable_name | Value |
+----------------------+-------+
| low_priority_updates | ON |
+----------------------+-------+
1 row in set (0.00 sec)
]]>
</screen>
</section>
<section>
<title>默认编码设置</title>
<screen>
<![CDATA[
character-set-server=utf8
collation_server=utf8_general_ci
]]>
</screen>
</section>
<section>
<title>SECTION</title>
<screen>
<![CDATA[
]]>
</screen>
</section>
</article>