#!/bin/bash

# Script Name: mysql_status_check.sh

# Description: check mysql servers status

# Author: Xinggang Wang - OpsEye.com

# Create Date: 2012/3/30

#获取MySQL所在服务器IP/端口/用户名/密码

read -p "Host=" HOST

read -p "Port=" PORT

read -p "User=" USER

read -sp "Password=" PASSWORD

echo

#默认为127.0.0.1/3306/root

if [ "${HOST}" = "" ]

then

HOST='127.0.0.1'

fi

if [ "${PORT}" = "" ]

then

PORT='3306'

fi

if [ "${USER}" = "" ]

then

USER='root'

fi

#注意密码为空的时候的格式

mysql_list="

$HOST:$PORT:$USER:$PASSWORD

"

#计算函数，提高脚本效率

compute(){

formula="$1"

awk 'BEGIN{printf("%.2f",'$formula')}' 2>/dev/null &&

echo $value || echo NULL

}

for mysql in $mysql_list

{

host=${mysql%%:*}

port=$(echo $mysql|awk -F: '{print $2}')

user=$(echo $mysql|awk -F: '{print $3}')

passwd=${mysql##*:}

[ -z "$passwd" ] && mysql="mysql -h$host -P$port -u$user" ||

mysql="mysql -h$host -P$port -u$user -p$passwd"

unset Uptime

# 把show global status的值赋给相应的参数名称(这里相当于大量的变量赋值操作)

eval $( $mysql -e "show global status" | awk '{print $1"=\x27"$2"\047"}')

[ X = X"$Uptime" ] && continue

# Mysql VER

VER=`$mysql -e"status;"|grep 'Server version'|awk '{print $3}'`

# Uptime

UPTIME=`compute "$Uptime/3600/24"`

# Threads_connected

threads_connected=`compute "$Threads_connected"`

# QPS Questions/Uptime

qps=`compute "$Questions/$Uptime"`

# TPS (Com_commit + Com_rollback)/Uptime

tps=`compute "($Com_commit+$Com_rollback)/$Uptime"`

# Reads Com_select + Qcache_hits

reads=`compute "$Com_select+$Qcache_hits"`

# Writes Com_insert + Com_update + Com_delete + Com_replace

writes=`compute "$Com_insert+$Com_update+$Com_delete+$Com_replace"`

# Read/Writes Ratio reads/writes*100%

rwratio=`compute "$reads/$writes*100"`%

# MyISAM Key_buffer_read_hits (1 - Key_reads/Key_read_requests) * 100

key_buffer_read_hits=`compute "(1-$Key_reads/$Key_read_requests)*100"`%

# MyISAM Key_buffer_write_hits (1 - Key_writes/Key_write_requests) * 100

key_buffer_write_hits=`compute "(1-$Key_writes/$Key_write_requests)*100"`%

# Query_cache_hits (Qcache_hits / (Qcache_hits + Qcache_inserts)) * 100%

query_cache_hits=`compute "$Qcache_hits/($Qcache_hits+$Qcache_inserts)*100"`%

# Innodb_buffer_read_hits (1 - Innodb_buffer_pool_reads/Innodb_buffer_pool_read_requests) * 100

innodb_buffer_read_hits=`compute "(1-$Innodb_buffer_pool_reads/$Innodb_buffer_pool_read_requests)*100"`%

# Thread_cache_hits (1 - Threads_created / Connections) * 100%

thread_cache_hits=`compute "(1-$Threads_created/$Connections)*100"`%

# Slow_queries_per_second Slow_queries / Uptime * 60

slow_queries_per_second=`compute "$Slow_queries/$Uptime"`

# Select_full_join_per_second Select_full_join / Uptime * 60

select_full_join_per_second=`compute "$Select_full_join/$Uptime*60"`

# select_full_join_in_all_select (Select_full_join / Com_select) * 100

select_full_join_in_all_select=`compute "($Select_full_join/$Com_select)*100"`%

# MyISAM Lock Contention (Table_locks_waited / Table_locks_immediate) * 100

myisam_lock_contention=`compute "($Table_locks_waited/$Table_locks_immediate)*100"`%

# Temp_tables_to_disk (Created_tmp_disk_tables / Created_tmp_tables) * 100

temp_tables_to_disk_ratio=`compute "($Created_tmp_disk_tables/$Created_tmp_tables)*100"`%

# print formated MySQL status report

title="******************** MySQL--${HOST}--${PORT} ***********************"

width=$((`echo "$title"|wc -c`-1))

echo "$title"

export IFS=':'

while read name value ;do

printf "%36s :\t%10s\n" $name $value

done

Uptime:$UPTIME days

Threads connected:$threads_connected

QPS:$qps

TPS:$tps

Reads:$reads

Writes:$writes

Read/Writes Ratio:$rwratio

MyISAM Key buffer read hits(>99%):$key_buffer_read_hits

MyISAM Key buffer write hits:$key_buffer_write_hits

Query cache hits:$query_cache_hits

InnoDB buffer read hits(>95%):$innodb_buffer_read_hits

Thread cache hits(>90%):$thread_cache_hits

Slow queries per second:$slow_queries_per_second

Select full join per second:$select_full_join_per_second

Select full join in all select:$select_full_join_in_all_select

MyiSAM lock contention(<1%):$myisam_lock_contention

Temp tables to disk ratio:$temp_tables_to_disk_ratio

EOF

unset IFS

for i in `seq $width`;{ echo -n "*";};echo

}

exit 0