對MySQL單個表和批量表轉換引擎腳本convert_engine.sh

發布時間: 2012/9/20 17:00:51

公司最近的MySQL總是大量的鎖表，分析了一下，基本上都是用的MYISAM表引擎，MYISAM在一張表里大量的讀寫會造成MySQL整張表都鎖死，而造成動態內容不能及時讀數據，給用戶體驗帶來巨大的影響。INNODB的工作原理只是鎖表的單行記錄（行鎖），不會影響同一張表內的其他行記錄。與是寫下了以下SHELL腳本，可單個表和整數據庫的引擎轉換...

#!/bin/sh

# Arg1          : -d dbname
# Arg2          : -t [tables]
# Arg3          : -e engine type (myisam | innodb)

User="root"
Pwd="666666"
MYSQLbin="/usr/local/mysql/bin/mysql -u$User -p$Pwd -e"
TmpFile='/tmp/table.tmp'
Usage()
{
    echo "Usage():$0 -d dbname [-t tbname] -e engine( myisam | innodb )"
}
if [ $# -eq 0 ];then
   Usage
   exit 1
fi
while getopts d:t:e:h OPTION
do
case $OPTION in
d)
{
    DBName=$OPTARG
       DBExists=`$MYSQLbin "show databases;"|grep "$DBName"`
    if [ "$DBExists" == "" ];then
       echo "$DBName database not exists!"
exit 1
     fi
};;
t)
{
    TBName=$OPTARG
    TBExists=`$MYSQLbin "use $DBName;show tables"|grep $TBName`
    if [ "$TBExists" == "" ];then
        echo "$TBName table not exists!"
        exit 1
    fi
};;
        e)
         {
   EngineName=`echo $OPTARG|tr A-Z a-z`
   if [ "$EngineName" != "myisam" ] && [ "$EngineName" != "innodb" ];then
          Usage
echo "Engine $EngineName is no exists!"
exit 1
          fi
   };;
?|h)
     Usage
     exit 0
   ;;
esac
done

        if [ "$EngineName" == "" ];then
                Usage
                echo "Lose '-e (innodb | myisam)'!"
                exit 1
        fi

if [ "$TBName" != "" ];then
CurrentEngine=`$MYSQLbin "use $DBName;show table status like '$TBName'\G"|grep Engine|awk '{print $2}'|tr A-Z a-z`
if [ "$CurrentEngine" == "$EngineName" ];then
     echo -e "\033[31m Current Table $TBName is already of type $EngineName;Ignored! \033[0m"
     exit 0
fi
        $MYSQLbin "use $DBName;alter table $TBName engine=$EngineName"
else
$MYSQLbin "use $DBName;show tables"|sed 1d > $TmpFile
while read Table
do
    CurrentEngine=`$MYSQLbin "use $DBName;show table status like '$Table'\G"|grep Engine|awk '{print $2}'|tr A-Z a-z`
           if [ "$CurrentEngine" == "$EngineName" ];then
               echo -e "\033[31m Current Table $Table is already of type $EngineName;Ignored! \033[0m"
    else
        $MYSQLbin "use $DBName;alter table $Table engine=$EngineName;"
        echo -e "\033[32m $DBName Table $Table Convert $EngineName is Sucessfull! \033[0m"
# continue
           fi
done < $TmpFile
fi