#!/bin/sh
MYSQL_PW=mysqlpass
logdir=/root/mysql-log
logfile=$logdir/thread.log
THR_MAX=50
[ ! -d $logdir ] && mkdir -p $logdir
while :;
do
        date >>$logfile
        thr=`mysql -uroot -p$MYSQL_PW  -e "status"|grep Threads|awk '{print $2}'`

                 echo -n "the process is :$thr " >>$logfile
                 [ $thr -gt $THR_MAX ] && mysql -uroot   -p$MYSQL_PW  -e "show full processlist"  >$logdir/`date +%y%m%d-%H%M`-proc.log
        echo  "" >>$logfile
        echo "===========================================" >>$logfile

        sleep 30
done