#!/bin/sh
###############################################################################################################
#Script name: Db2_Resize_Tablespace.sh
#Script description: Resize tablespace space.
#Current Release Version: 1.0.0
#Script Owner: He, Haibo
#Latest editor: He, Haibo
#Support platform: db2 9.7,10.1,10.5,11.1
#Change log:
#
#
#
###############################################################################################################
export LANG=en_US
paracount=$#
osbox=`uname`
userName=`id | awk -F ' ' {'print $1'} | awk -F '(' {'print $2'} | awk -F ')' {'print $1'}`
RHversion=$(cat /proc/version | sed 's/[^0-9]//g' | cut -b -3)
####判断传入的参数是否为3

if [ $paracount == 3 ];then
    DatabaseName=$1
    TabSpaceName=$2
    TabSpaceSize=$3
else
    echo "Example:./Db2_Resize_Tablespace.sh testdb tbs02 1"
    echo 1
    exit 1
fi

###如果没有    /yunwei/Release/log目录，则创建
mkdirLogPath(){
    if [[ ! -d /yunwei/Release/log ]];then
        mkdir -p /yunwei/Release/log
        chmod 767 /yunwei/Release/log
    fi
    db2LogPath="/yunwei/Release/log"
    db2Log=db2resizetablespace_$(date +%y%m%d).log
}    

###判断系统是否为Linux平台，如果不是Linux，则退出.    
getOSArchitecture(){
    if [[ "$osbox" == "Linux" ]];then
        continue
    else
        echo "Current OS is $osbox,shell is exit now." | tee -a $db2LogPath/$db2Log
        echo 1
        exit 1
    fi
}

###判断系统是否为Redhat,如果不是则退出，支持Redhat 5、6、7三个版本
getOSVersion(){
    cat /proc/version | grep -i redhat > /dev/null
    if [[ $? == 0 ]];then
        if [[ "$RHversion" -ge 261 ]];then 
            continue
        else
            echo "Current Rehat Version will not support." | tee -a $db2LogPath/$db2Log
            echo 1
            exit 1
        fi 
    else
        echo "Current os is not Redhat."
        echo 1
        exit 1
    fi
}

###判断是否是实例用户,如果是非实例用户则退出
getInstanceUser(){
    ps -ef | grep db2sysc | grep -v grep | awk '{print $1}' |uniq | grep -i $userName > /dev/null
    if [[ $? == 0 ]];then
        continue
    else
        echo "Current user is $userName,is not InstanceName or DB2 Instance is not exists." | tee -a $db2LogPath/$db2Log
        echo 1
        exit 1
    fi 
}



###判断DB2版本是否为9.7、10.1、10.5、11.1
getDBVersion(){    
    DB2LEVEL=`db2level |grep tokens|awk -F'"' '{print $2}'|awk -F'v' '{print $2}'`
    if [[ $DB2LEVEL == 11.1* || $DB2LEVEL == 10.5* || $DB2LEVEL == 10.1* || $DB2LEVEL == 9.7* ]];then
        continue
    else
        echo "Current $DB2LEVEL does not Support" | tee  -a $db2LogPath/$db2Log
        echo 1
        exit 1
    fi
}

###判断传入的数据库库名是否存在
getDBName(){            
    db2 list db directory | grep -B5 Indirect | grep 'Database alias' | awk '{print $4}' | grep -iw $DatabaseName > /dev/null
    if [[ $? == 0 ]];then
        continue 
    else
        echo "Does not have $DatabaseName in Current database" | tee -a $db2LogPath/$db2Log
        echo 1
        exit 1
    fi        
}

###判断传入的库是否激活，如果未激活，则退出
getDBActivate(){
    db2 list active databases | grep -iw $DatabaseName > /dev/null
    if [[ $? == 0 ]];then
        continue
    else
        echo "Current database $DatabaseName is not activate." | tee -a $db2LogPath/$db2Log
        echo 1
        exit 1
    fi
}

###判断数据库架构
getDBArchitecture(){            
    ARCHITECTURE=`cat ~/sqllib/db2nodes.cfg | awk '{if(NF > 3) print "Purescale"; else if(NR > 1) print "DPF"; else print "Alone"}' | tail -1`
    if [[ "$ARCHITECTURE" == "Alone" ]];then
        #cause HADR only in "Alone" architecture
        hadr_role=`db2 get db cfg for $DatabaseName | grep -i role | awk '{print $5}'`
        if [[ "$hadr_role" == "PRIMARY" || "$hadr_role" == "STANDARD" ]];then
            continue
        else
            echo "ARCHITECTURE is standby" | tee -a $db2LogPath/$db2Log
            echo 1
            exit 1
        fi
    else
        echo "ARCHITECTURE is $ARCHITECTURE" | tee -a $db2LogPath/$db2Log
        echo 1
        exit 1
    fi
}

getConnectDB(){
###db2 connect to <dbname>
    db2 connect to $DatabaseName >> $db2LogPath/$db2Log
    if [[ $? == 0 ]];then
        continue
    else
        echo "Connect $1 not correct." | tee -a $db2LogPath/$db2Log
        echo 1
        exit 1
    fi
}

###判断传入的tablespace是否存在
getTableSpaceName(){        
    TbsName=$(echo $TabSpaceName|tr '[a-z]' '[A-Z]')
    db2 -x "select tbspace from syscat.tablespaces where tbspace='$TbsName'" > /dev/null
    if [[ $? == 0 ]];then
        continue
    else
        echo "$TabSpaceName does not exists in database $DatabaseName" | tee -a $db2LogPath/$db2Log
        echo 1
        exit 1
    fi
}    

###判断传入的tablespace状态是否为Normal,如果不是normal，则退出。
getTablespaceStatus(){
    TbsName=$(echo $TabSpaceName|tr '[a-z]' '[A-Z]')
    TbsStatus=`db2 -x "select varchar(TBSP_STATE,20) from table(MON_GET_TABLESPACE('',-2)) where tbsp_name='$TbsName'"`
    echo "$TbsName is $TbsStatus"
    if [[ "$TbsStatus" =~ "NORMAL" ]];then
        continue
    else
        echo "$TabSpaceName's status is not NORMAL now."
        echo 1
        exit 1
    fi
}

resizeTablespaceSize(){    
    temp=$(db2 -x "select varchar(tbsp_name,30) as tbsp_name,tbsp_type,tbsp_using_auto_storage,tbsp_auto_resize_enabled from table(MON_GET_TABLESPACE('',-2))")
    tbsType=`echo "$temp" | grep -i $TbsName | awk {'print $2'}`
    autoStorage=`echo "$temp" | grep -i $TbsName | awk {'print $3'}`
    autoResize=`echo "$temp" | grep -i $TbsName | awk {'print $4'}`
#    maxSize=`echo "$temp" | grep -i $TbsName | awk {'print $5'}`
#    tbsId=`db2 -x "select varchar(tbsp_name,30) as tbsp_name,tbsp_type,tbsp_using_auto_storage,tbsp_auto_resize_enabled,tbsp_max_size,tbsp_id from table(MON_GET_TABLESPACE('',-2))" | grep -i $TbsName | awk {'print $6'}`
#    tbsPathName=`db2 list tablespace containers for $tbsId | grep Name | awk -F '=' {'print $2'} | awk -F '/' {'print $2'}`
    temp1=`db2 -x "select varchar(TBSP_NAME,30) as TBSP_NAME,varchar(CONTAINER_NAME,100) as CONTAINER_NAME,FS_TOTAL_SIZE/1024/1024/1024-FS_USED_SIZE/1024/1024/1024 from table(MON_GET_CONTAINER('',-2))"`
    containerNum=`echo "$temp1" | grep -i  $TbsName | awk {'print $2'} | wc -l`
#    echo "containerNum is $containerNum"
#    TotalFreePathSize=`echo "$temp1" | grep -i $TbsName | awk {'print $3'} | awk '{sum += $1} END {print sum}'`
#获取多路径情况下，最小的path值
    MinPathSize=`echo "$temp1" | grep -i $TbsName | awk {'print $3'} | awk 'BEGIN {min = 65536} {if ($1+0 < min+0) min = $1} END {print min}'`
#    echo "MinPathSize is $MinPathSize"G""
    TablespaceSize_M=`echo $TabSpaceSize*1024/$containerNum|bc`
    MinPathSize_M=`echo $MinPathSize*1024|bc`
#    echo "MinPathSize_M is $MinPathSize_M"
    if [[ $MinPathSize_M -gt $TabSpaceSize_M ]];then
        continue
    else
        echo "Extend Size is bigger than the Free Size,script will exit now." | tee -a $db2LogPath/$db2Log
        echo 1
        exit 1
    fi
    if [[ $autoStorage == 0 && "$tbsType" == "DMS" ]];then
        if [[ $autoResize == 0 ]];then            
            echo "TablespaceSize_M is $TablespaceSize_M"M""
            db2 "alter tablespace $TabSpaceName extend (all $TablespaceSize_M M)" >>  $db2LogPath/$db2Log
            if [[ $? == 0 ]];then
                echo "Add tablespace $TabSpaceName size $TabSpaceSize"G" succussfully" | tee -a  $db2LogPath/$db2Log
                echo 0
                exit 0
            else
                echo "Alter tablespace failed." | tee -a $db2LogPath/$db2Log
                echo 1
                exit 1
            fi
        else
            echo "$TabSpaceName autoResize is YES，script will exit now." | tee -a  $db2LogPath/$db2Log
            echo 1
            exit 1
        fi
    else
        echo "AutoStorage is $autoStorage and TbsType is $tbsType,script will exit now." | tee -a $db2LogPath/$db2Log
        echo "$TabSpaceName cannot extend " | tee -a  $db2LogPath/$db2Log
        echo 1
        exit 1
    fi
}

main(){
    mkdirLogPath
    getOSArchitecture
    getOSVersion
    getInstanceUser
    getDBVersion
    getDBName
    getDBActivate
    getDBArchitecture
    getConnectDB
    getTableSpaceName
    getTablespaceStatus
    resizeTablespaceSize
}



main

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