[percona-toolkit] pt-mysql-summary分析mysq数据库

wget https://www.percona.com/downloads/percona-toolkit/2.2.19/RPM/percona-toolkit-2.2.19-1.noarch.rpm

yum install percona-toolkit-2.2.19-1.noarch.rpm

pt-mysql-summary也是percona-toolkit-2.2.8-1.noarch.rpm工具集的一部分。

安装工具集:
http://blog.itpub.net/29254281/viewspace-1208415/

MySQL的show status命令 仅仅是一个状态的计数器。
通常情况下,需要采集一个间隔的show status命令，然后分析它的趋势。

一定时间间隔的采集可以使用mysqladmin extended-status
但是更简单的方法是使用pt-mysql-summary工具。

关于pt-mysql-summary工具的介绍请参考:
http://www.cnblogs.com/zhoujinyi/p/3384667.html

下面的脚本通过一个时间间隔的状态采集，
得到这个间隔的增、删、改、查、提交、回滚的总数，然后通过gnuplot画图工具，绘制出图形。

脚本如下(Probe.sh):

#!/bin/bash
#采集间隔时间,单位s
asleep=10
user=root
password=root
probe_file=probe.log
output_image=/tmp/probe.png
while [ 1 ] ; do
    a=$(pt-mysql-summary --user $user --password $password | grep -i "com_insert\|com_delete\|com_update\|com_select\|com_commit\|com_rollback" | awk     '{if(length($4)==0) print 0 ;else print $4}' | tr -t '\n' ' '); echo $(date "+%Y-%m-%d_%H:%M:%S") $a >> $probe_file

    gnuplot -e "set terminal png size 3000,1000 ; set size ratio 0.9 ; set output '$output_image' ; set xtic rotate by 90 ; set xdata time ; set grid;set     timefmt '%Y-%m-%d_%H:%M:%S' ; plot 'probe.log' using 1:2 with line title 'Commit', 'probe.log' using 1:3 with line title 'Delete', 'probe.log' using     1:4 with line title 'insert','probe.log' using 1:5 with line title 'rollback','probe.log' using 1:6 with line title 'select','probe.log' using 1:7 with     line title 'update' ; "
done;

运行脚本,并且使用TPCC-MySQL基准测试工具开始测试(加一些流量容易看出效果)

TPCC-MySQL
http://blog.itpub.net/29254281/viewspace-1195589/

关于Gnuplot画图工具的简单使用

http://www.heboliang.cn/archive/timedata_gnuplot.html

执行命令，察看结果

[root@472322 ~]#pt-mysql-summary --user=pt --password='pt'  --port=3308 -S /data56m1/mysql3308.sock

Warning: Using a password on the command line interface can be insecure.
# Percona Toolkit MySQL Summary Report #######################
              System time | 2013-11-07 03:38:14 UTC (local TZ: CST -0600)

 

（1）第一部分实例信息，有个参数需要特别注意、Time 指的是MySQL 服务器的当前时间、而不是MySQL 服务器所在的系统的时间 

# Percona Toolkit MySQL Summary Report #######################
System time | 2016-09-01 09:59:25 UTC (local TZ: PDT -0700)
# Instances ##################################################
Port Data Directory Nice OOM Socket
===== ========================== ==== === ======
0 0 
# MySQL Executable ###########################################
Path to executable | /usr/sbin/mysqld
Has symbols | Yes
# Report On Port 3306 ########################################
User | pt@%
Time | 2016-09-01 02:59:25 (PDT)
Hostname | localhost.localdomain
Version | 5.7.14 MySQL Community Server (GPL)
Built On | Linux x86_64
Started | 2016-08-28 23:23 (up 3+03:36:14)
Databases | 5
Datadir | /var/lib/mysql/
Processes | 1 connected, 1 running
Replication | Is not a slave, has 0 slaves connected
Pidfile | /var/run/mysqld/mysqld.pid (exists)
# Processlist ################################################

 

（2）第二部分是从show full processlist;中来的信息，对每一列进行了一些分析统计。
  

Command COUNT(*) Working SUM(Time) MAX(Time)
------------------------------ -------- ------- --------- ---------
Query 1 1 0 0

 

User COUNT(*) Working SUM(Time) MAX(Time)
------------------------------ -------- ------- --------- ---------
pt 1 1 0 0

 

Host COUNT(*) Working SUM(Time) MAX(Time)
------------------------------ -------- ------- --------- ---------
localhost 1 1 0 0

 

db COUNT(*) Working SUM(Time) MAX(Time)
------------------------------ -------- ------- --------- ---------
NULL 1 1 0 0

 

State COUNT(*) Working SUM(Time) MAX(Time)
------------------------------ -------- ------- --------- ---------
starting 1 1 0 0

 

（3）第三部分是从取自 show global status 、仅收集哪些变化的量，比较有价值的应该是第三列Per day Per second、取自两张快照、除以变化量、算出每秒的变化

（4）第四部分显示表缓存的大小、Usage表示在用的百分比，是一个比较近似的值。

# Table cache ################################################
Size | 2000
Usage | 15%

（5）第五部分显示安装的产品的特性。
# Key Percona Server features ################################
      Table & Index Stats | Not Supported
     Multiple I/O Threads | Enabled
     Corruption Resilient | Not Supported
      Durable Replication | Not Supported
     Import InnoDB Tables | Not Supported
     Fast Server Restarts | Not Supported
         Enhanced Logging | Not Supported
     Replica Perf Logging | Disabled
      Response Time Hist. | Not Supported
          Smooth Flushing | Not Supported
      HandlerSocket NoSQL | Not Supported
           Fast Hash UDFs | Unknown
# Percona XtraDB Cluster #####################################

（6）第六部分显示当前的插件以及状态。
# Plugins ####################################################
       InnoDB compression | ACTIVE

（7）第七部分显示Query cache的参数值以及命中率。

# Query cache ################################################
query_cache_type | OFF
Size | 1.0M
Usage | 1%
HitToInsertRatio | 0%

# Schema #####################################################

（8）第八部分显示当前db下需要关注的一些点，比如SSL，Delayed Insert等。

# Noteworthy Technologies ####################################
                      SSL | No
     Explicit LOCK TABLES | No
           Delayed Insert | No
          XA Transactions | No
              NDB Cluster | No
      Prepared Statements | No
 Prepared statement count | 0
# InnoDB #####################################################

Version | 5.7.14
Buffer Pool Size | 128.0M
Buffer Pool Fill | 90%
Buffer Pool Dirty | 0%
File Per Table | ON
Page Size | 16k
Log File Size | 2 * 48.0M = 96.0M
Log Buffer Size | 16M
Flush Method | 
Flush Log At Commit | 1
XA Support | ON
Checksums | ON
Doublewrite | ON
R/W I/O Threads | 4 4
I/O Capacity | 200
Thread Concurrency | 0
Concurrency Tickets | 5000
Commit Concurrency | 0
Txn Isolation Level | REPEATABLE-READ
Adaptive Flushing | ON
Adaptive Checkpoint | 
Checkpoint Age | 9
InnoDB Queue | 0 queries inside InnoDB, 0 queries in queue
Oldest Transaction | 0 Seconds
History List Len | 995
Read Views | 0
Undo Log Entries | 2 transactions, 4 total undo, 3 max undo
Pending I/O Reads | 0 buf pool reads, 0 normal AIO, 0 ibuf AIO, 0 preads
Pending I/O Writes | 0 buf pool (0 LRU, 0 flush list, 0 page); 0 AIO, 0 sync, 0 log IO (0 log, 0 chkp); 0 pwrites
Pending I/O Flushes | 0 buf pool, 0 log
Transaction States | 1xnot started

# MyISAM #####################################################
                Key Cache | 8.0M
                 Pct Used | 20%
                Unflushed | 0%
# Security ###################################################
                    Users | 9 users, 2 anon, 6 w/o pw, 6 old pw
            Old Passwords | 0
# Binary Logging #############################################

 （9）第九部分显示当前的一些buffer参数值。

# Noteworthy Variables #######################################
Auto-Inc Incr/Offset | 1/1
default_storage_engine | InnoDB
flush_time | 0
init_connect | 
init_file | 
sql_mode | ONLY_FULL_GROUP_BY,STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION
join_buffer_size | 256k
sort_buffer_size | 256k
read_buffer_size | 128k
read_rnd_buffer_size | 256k
bulk_insert_buffer | 0.00
max_heap_table_size | 16M
tmp_table_size | 16M
max_allowed_packet | 4M
thread_stack | 256k
log | 
log_error | /var/log/mysqld.log
log_warnings | 2
log_slow_queries | 
log_queries_not_using_indexes | OFF
log_slave_updates | OFF
# Configuration File #########################################

Config File | /etc/my.cnf

[mysqld]
datadir = /var/lib/mysql
socket = /var/lib/mysql/mysql.sock
port = 3306
symbolic-links = 0
log-error = /var/log/mysqld.log
pid-file = /var/run/mysqld/mysqld.pid
performance_schema = ON
# The End ####################################################