參加煉數成金的MySQL培訓,這是其中的一個作業題.

原來做過類似的監控
http://blog.itpub.net/29254281/viewspace-1222337/

首先,使用指令碼進行資料採集
vim /tmp/probe.sh

#!/bin/bash
#採集間隔時間,單位s
asleep=10
user=root
password=root
probe_file=probe.log
while [ 1 ] ; do
a=$(pt-mysql-summary --user $user --password $password --sleep $asleep | grep -i "Innodb_buffer_pool_read_requests\|Innodb_buffer_pool_reads" | awk '{if(length($3)==0) print 0 ;else print $3}'| tr -t '\n' ' ');
Innodb_buffer_pool_read_requests=$(echo $a | awk '{print $1}')
Innodb_buffer_pool_reads=$(echo $a | awk '{print $2}')
Innodb_buffer_read_hit_ratio=$(echo "scale=2; ((1 - $Innodb_buffer_pool_reads/$Innodb_buffer_pool_read_requests) * 100)" | bc)

echo $(date "+%Y-%m-%d_%H:%M:%S") $Innodb_buffer_read_hit_ratio >> $probe_file
done;

然後準備繪製圖形的指令碼
vim probe.gp

set terminal png size 3000,1000 font '/usr/share/fonts/wqy-zenhei/wqy-zenhei.ttc,14';
set yrange [0:100]
set size ratio 0.9 ;
set output '/tmp/probe.png' ;
set xdata time ;
set grid;
set timefmt '%Y-%m-%d_%H:%M:%S' ;
set xlabel "時間"
set ylabel "命中率"
plot '/tmp/probe.log' using 1:2 with line title 'InnoDB Buffer Pool命中率'

每次需要檢視InnoDB Buffer Pool命中率的時候,執行命令

然後檢視繪製的圖形

MySQL監控InnoDB Buffer Pool命中率

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