mysql优化笔记,MySQL优化笔记

2024-06-05 19:36:17

之前安装时没注意MySQL的优化,先想对MySQL做一下优化.首先看一下没有优化之前各个参数:MySQL预编译参数: ./configure --prefix=/usr/local/mysql --with-ssl --with-readline --with-big-tables --enable-assembler top 32553 mysql 20 0 125m 17m 4064 S 0.

之前安装时没注意MySQL的优化,先想对MySQL做一下优化.首先看一下没有优化之前各个参数:

MySQL预编译参数:

./configure --prefix=/usr/local/mysql --with-ssl --with-readline --with-big-tables --enable-assembler

top

32553 mysql 20 0 125m 17m 4064 S 0.0 1.7 5:13.01 mysqld

使用mysqlreport获取MySQL运行参数:

MySQL 5.0.40-log uptime 15 22:1:21 Sat Feb 4 10:04:23 2012

__ Key _________________________________________________________________

Buffer used 62.00k of 16.00M %Used: 0.38

Current 1.90M %Usage: 11.89

Write hit 22.29%

Read hit 99.83%

__ Questions ___________________________________________________________

Total 85.58k 0.1/s

DMS 77.61k 0.1/s %Total: 90.69

Com_ 5.37k 0.0/s 6.28

COM_QUIT 2.52k 0.0/s 2.95

+Unknown 78 0.0/s 0.09

Slow 10 s 0 0/s 0.00 %DMS: 0.00 Log: OFF

DMS 77.61k 0.1/s 90.69

SELECT 72.77k 0.1/s 85.03 93.76

UPDATE 2.68k 0.0/s 3.13 3.45

INSERT 1.09k 0.0/s 1.27 1.41

DELETE 1.07k 0.0/s 1.25 1.38

REPLACE 0 0/s 0.00 0.00

Com_ 5.37k 0.0/s 6.28

set_option 2.60k 0.0/s 3.04

change_db 2.52k 0.0/s 2.94

show_fields 77 0.0/s 0.09

__ SELECT and Sort _____________________________________________________

Scan 5.17k 0.0/s %SELECT: 7.10

Range 2.75k 0.0/s 3.77

Full join 0 0/s 0.00

Range check 0 0/s 0.00

Full rng join 0 0/s 0.00

Sort scan 5.97k 0.0/s

Sort range 4.30k 0.0/s

Sort mrg pass 0 0/s

__ Table Locks _________________________________________________________

Waited 24 0.0/s %Total: 0.03

Immediate 91.00k 0.1/s

__ Tables ______________________________________________________________

Open 36 of 64 %Cache: 56.25

Opened 42 0.0/s

__ Connections _________________________________________________________

Max used 5 of 100 %Max: 5.00

Total 2.52k 0.0/s

__ Created Temp ________________________________________________________

Disk table 4.15k 0.0/s

Table 7.11k 0.0/s Size: 32.0M

File 5 0.0/s

__ Threads _____________________________________________________________

Running 1 of 1

Cached 0 of 0 %Hit: 0.04

Created 2.52k 0.0/s

Slow 0 0/s

__ Aborted _____________________________________________________________

Clients 0 0/s

Connects 0 0/s

__ Bytes _______________________________________________________________

Sent 226.71M 164.8/s

Received 12.59M 9.2/s

__ InnoDB Buffer Pool __________________________________________________

Usage 304.00k of 8.00M %Used: 3.71

Read hit 84.42%

Pages

Free 493 %Total: 96.29

Data 19 3.71 %Drty: 0.00

Misc 0 0.00

Latched 0 0.00

Reads 77 0.0/s

From file 12 0.0/s 15.58

Ahead Rnd 1 0.0/s

Ahead Sql 0 0/s

Writes 0 0/s

Flushes 0 0/s

Wait Free 0 0/s

__ InnoDB Lock _________________________________________________________

Waits 0 0/s

Current 0

Time acquiring

Total 0 ms

Average 0 ms

Max 0 ms

__ InnoDB Data, Pages, Rows ____________________________________________

Data

Reads 25 0.0/s

Writes 3 0.0/s

fsync 3 0.0/s

Pending

Reads 0

Writes 0

fsync 0

Pages

Created 0 0/s

Read 19 0.0/s

Written 0 0/s

Rows

Deleted 0 0/s

Inserted 0 0/s

Read 0 0/s

Updated 0 0/s

首先在预编译参数上进行优化

./configure --prefix=/usr/local/mysql \

--without-debug \ # 取消调试模式提高性能

--with-extra-charsets=utf8,gbk \ # 仅仅指定需要的默认字符集提高性能

--enable-assembler \ # 使用汇编模式提高性能

--with-mysqld-ldflags=-all-static \ # 以静态方式编译提高性能

--with-client-ldflags=-all-static \

--with-unix-socket-path=/tmp/mysql.sock \ # 使用unix socket提高性能

--with-ssl

安装完成后进一步优化my.cnf:

因为MySQL 只会 Cache 索引(*.MYI)，因此您只要将数据库中所有的 MYI 档案加总起来就是key buffer 的值,计算MYI档案的总大小:

du -hc `find /usr/local/mysql/var/ -name *.MYI`

4.0K /usr/local/mysql/var/myblog/wp_term_taxonomy.MYI

8.0K /usr/local/mysql/var/myblog/wp_posts.MYI

8.0K /usr/local/mysql/var/myblog/wp_usermeta.MYI

8.0K /usr/local/mysql/var/myblog/wp_commentmeta.MYI

16K /usr/local/mysql/var/myblog/wp_options.MYI

12K /usr/local/mysql/var/myblog/wp_postmeta.MYI

8.0K /usr/local/mysql/var/myblog/wp_comments.MYI

4.0K /usr/local/mysql/var/myblog/wp_links.MYI

4.0K /usr/local/mysql/var/myblog/wp_term_relationships.MYI

4.0K /usr/local/mysql/var/myblog/wp_users.MYI

8.0K /usr/local/mysql/var/myblog/wp_terms.MYI

16K /usr/local/mysql/var/mysql/help_relation.MYI

4.0K /usr/local/mysql/var/mysql/time_zone_name.MYI

16K /usr/local/mysql/var/mysql/help_keyword.MYI

4.0K /usr/local/mysql/var/mysql/func.MYI

4.0K /usr/local/mysql/var/mysql/time_zone.MYI

20K /usr/local/mysql/var/mysql/help_topic.MYI

4.0K /usr/local/mysql/var/mysql/columns_priv.MYI

4.0K /usr/local/mysql/var/mysql/procs_priv.MYI

4.0K /usr/local/mysql/var/mysql/time_zone_leap_second.MYI

4.0K /usr/local/mysql/var/mysql/user.MYI

4.0K /usr/local/mysql/var/mysql/tables_priv.MYI

4.0K /usr/local/mysql/var/mysql/host.MYI

4.0K /usr/local/mysql/var/mysql/time_zone_transition_type.MYI

4.0K /usr/local/mysql/var/mysql/proc.MYI

4.0K /usr/local/mysql/var/mysql/help_category.MYI

4.0K /usr/local/mysql/var/mysql/db.MYI

4.0K /usr/local/mysql/var/mysql/time_zone_transition.MYI

192K total

修改my.cnf参数大小:

vi /etc/my.cnf

# 降低key_buffer的值

key_buffer = 4M

重启MySQL执行top命令:

18125 mysql 20 0 109m 11m 2152 S 0.0 1.1 0:00.08 mysqld

看到MySQL的内存利用率降低到1.1,这时候还不适宜执行mysqlreport查看等待启动一天后查看.由于现在访问量较低,所以参数适量调低,需要实时监控MySQL运行状况适当运行参数.

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