安装
1)下载percona-toolkit 工具包
wget percona.com/get/percona-toolkit.tar.gz
2)解压
tar -zxvf percona-toolkit.tar.gz
3)进入安装目录
cd /home/percona-toolkit-3.1.0
4)安装perl模块,制定依赖路径
perl Makefile.PL PREFIX=/usr/local/percona-toolkit
报错如下:
Can't locate ExtUtils/MakeMaker.pm in @INC (@INC contains: /usr/local/lib/perl5 /usr/local/share/perl5 /usr/lib/perl5/vendor_perl /usr/share/perl5/vendor_perl /usr/lib/perl5 /usr/share/perl5 .) at Makefile.PL line 2.
BEGIN failed--compilation aborted at Makefile.PL line 2.
使用yum install perl-ExtUtils-MakeMaker
解决
5)安装依赖包
yum install perl-DBD-MySQL
yum -y install perl-Digest-MD5
再执行perl Makefile.PL PREFIX=/usr/local/percona-toolkit
6)编译安装
make && make install
控制台输出如下,则编译安装成功
Installing /usr/local/percona-toolkit/bin/pt-config-diff
Installing /usr/local/percona-toolkit/bin/pt-stalk
Appending installation info to /usr/local/percona-toolkit/lib64/perl5/perllocal.pod`
确认MySQL配置
使用show VARIABLES like '%query%'
确认MySQL是否打开慢查询;
long_query_time 0.000000(慢查询时间)
slow_query_log ON(是否开启慢查询)
slow_query_log_file /var/lib/mysql/k8s-add_node3-slow.log(慢查询日志位置)
如果slow_query_log=off,配置/etc/my.cnf
[mysqld]
#打开慢查询
slow_query_log = ON
#设置超时时间为0,也就是记录所有的查询
long_query_time = 0
重启MySQL:systemctl restart mysqld
使用
首先进入到pt-query-digest所在位置,我的是在/home/percona-toolkit-3.1.0/bin下,执行./pt-query-digest /var/lib/mysql/k8s-add_node3-slow.log
慢查询日志分析语句:
[root@k8s-add_node3 etc]# cd /home/percona-toolkit-3.1.0/bin/
[root@k8s-add_node3 bin]# ./pt-query-digest /var/lib/mysql/k8s-add_node3-slow.log
返回结果分为3大部分
- 第一部分
该工具执行日志分析的用户时间,系统时间,物理内存占用大小,虚拟内存占用大小
# 360ms user time, 10ms system time, 22.56M rss, 187.09M vsz
工具执行时间
# Current date: Fri Mar 20 22:54:14 2020
运行分析工具的主机名
# Hostname: iZ2zebthf35ejlps5v87ksZ
被分析的文件名
# Files: /usr/local/src/slowsqlExample/slow0312.log
语句总数量,唯一的语句数量,QPS,并发数
# Overall: 906 total, 21 unique, 0.02 QPS, 0.07x concurrency _____________
日志记录的时间范围
# Time range: 2020-03-11 12:22:13 to 2020-03-12 00:16:57
# Attribute total min max avg 95% stddev median
# ============ ======= ======= ======= ======= ======= ======= =======
语句执行时间
# Exec time 2991s 2s 10s 3s 5s 1s 3s
锁占用时间
# Lock time 552ms 24us 371ms 609us 103us 12ms 57us
发送到客户端的行数
# Rows sent 167.53k 0 17.99k 189.35 487.09 1.22k 0
select语句扫描行数
# Rows examine 980.73M 238 1.96M 1.08M 1.95M 757.80k 753.18k
查询的字符数
# Query size 258.71k 17 1.77k 292.41 463.90 202.02 329.68
- 第二部分
# Profile
Rank:所有语句的排名,默认按查询时间降序排列,通过--order-by指定
Query ID:语句的ID,(去掉多余空格和文本字符,计算hash值)
Response:总的响应时间
time:该查询在本次分析中总的时间占比
calls:执行次数,即本次分析总共有多少条这种类型的查询语句
R/Call:平均每次执行的响应时间
V/M:响应时间Variance-to-mean的比率
Item:查询对象
# Rank Query ID Response time Calls R/Call V/M
# ==== =============================== =============== ===== ====== =====
# 1 0xABD1DCCCCD5AA5128E10C27B34... 1246.6948 41.7% 283 4.4053 0.04 UPDATE ziweidashi_deviceinfo
# 2 0x6914B81AAD1785E50708ABD113... 877.6900 29.3% 339 2.5891 0.09 SELECT birthDay_notify
# 3 0x44D9474C6D5C58DD07B5FEEA0D... 299.4193 10.0% 71 4.2172 0.05 SELECT tmall_product_orders
# 4 0xA9BE84CBE3DAA9B1CDD9B5A9EC... 127.0137 4.2% 46 2.7612 0.04 SELECT daily_user_action_log
# 5 0xCF0E12117C971C3013142E3717... 118.3138 4.0% 49 2.4146 0.05 SELECT tmall_user_take_coupon_record
# 6 0x94263184D24186330B13193534... 97.0805 3.2% 35 2.7737 0.56 SELECT tgg_users
# 7 0xC51165F1287A2ECDA221AC1F54... 52.5870 1.8% 22 2.3903 0.04 SELECT util_user_task_log
# 8 0xB8004D6D8A7A7967E04CD81E26... 43.7895 1.5% 16 2.7368 0.08 SELECT daily_user_action_log
# 9 0x910E19224F33DAA6391927B8E8... 41.3720 1.4% 15 2.7581 1.17 SELECT qifugong_tianbi_record
# MISC 0xMISC 86.7871 2.9% 30 2.8929 0.0 <12 ITEMS>
- 第三部分
第三及后续部分,第一条查询语句 query id:0xABD1DCCCCD5AA5128E10C27B34BC04E7
# Query 1: 0.01 QPS, 0.03x concurrency, ID 0xABD1DCCCCD5AA5128E10C27B34BC04E7 at byte 355748
# Scores: V/M = 0.04
# Time range: 2020-03-11 12:24:03 to 2020-03-12 00:16:13
# Attribute pct total min max avg 95% stddev median
# ============ === ======= ======= ======= ======= ======= ======= =======
# Count 31 283
# Exec time 41 1247s 4s 8s 4s 5s 437ms 4s
# Lock time 69 386ms 24us 371ms 1ms 93us 21ms 44us
# Rows sent 0 0 0 0 0 0 0 0
# Rows examine 18 180.00M 651.14k 651.45k 651.29k 650.62k 0 650.62k
# Query size 10 27.64k 100 100 100 100 0 100
# String:
数据库名
# Databases taxen_ziweidashi
执行主机
# Hosts 118.190.93.166
执行用户
# Users devAccount
查询时间占比
# Query_time distribution
# 1us
# 10us
# 100us
# 1ms
# 10ms
# 100ms
# 1s ################################################################
# 10s+
# Tables
# SHOW TABLE STATUS FROM `taxen_ziweidashi` LIKE 'ziweidashi_deviceinfo'\G
# SHOW CREATE TABLE `taxen_ziweidashi`.`ziweidashi_deviceinfo`\G
UPDATE ziweidashi_deviceinfoSET expired = 1 WHERE createTime <= 1583942580685\G
# Converted for EXPLAIN
# EXPLAIN /*!50100 PARTITIONS*/
select expired = 1 from ziweidashi_deviceinfo where createTime <= 1583942580685\G
常用命令
1.分析慢查询文件
pt-query-digest slow.log > slow_report.log
2.分析最近12小时内的查询
pt-query-digest --since=12h slow.log > slow_report2.log
3.分析指定时间范围内的查询
pt-query-digest slow.log --since ‘2017-01-07 09:30:00’ --until ‘2017-01-07 10:00:00’> > slow_report3.log