Oracle 主从切换脚本

news2024/11/17 0:34:46

一、 切换前预检查

1. dg_precheck_main_v1.4.sh

#!/bin/bash

#**********************************************************************************
# Author: Hehuyi_In
# Date: 2022年06月16日
# FileName: dg_precheck_main_v1.4.sh
# 
# For sys user, execute the script directly. 
# For other sysdba privileged users, you need to manually synchronize the password file to standby server in versions below 12.2.
# The script cannot be executed on the Linux 5 os.
#
# Example: 
# ./dg_precheck_main_v1.4.sh &> dg_precheck.log
# cat dg_precheck.log | grep --color=no -E "Warning|Error" ,or less -R dg_precheck.log
#
#
# Description:
# 2022-06-16 v_1.0 just get and print the infomation we want
# 2022-06-17 v_1.1 auto check the database role
# 2022-06-22 v_1.2 adjust the output format
# 2022-06-28 v_1.3 add compare function, compare two nodes at a time
# 2022-06-28 split to two scripts dg_precheck_main_v1.0.sh and dg_precheck_func_v1.0.sh
# 2022-07-06 dg_precheck_main_v1.1 check os info
# 2022-07-12 dg_precheck_main_v1.2 adjust the output format
# 2022-07-13 dg_precheck_main_v1.3 adjust os info check function
# 2022-10-19 dg_precheck_main_v1.4 add checking items: dblink,standby_file_management,flashback_on,db_flashback_retention_target,db_recovery_file_dest,db_recovery_file_dest_size 
#**********************************************************************************

source ./dg_precheck_func_v1.4.sh

# TNS列表
TNS_LIST=(test_dg test)

# 连接信息
DBUSER='sys/"xxxxx"'


# --------------------------- 检查并设置TNS_LIST中各tnsname对应数据库角色 ----------------------------------
auto_check_db_role

# 字典定义
declare -A PRIMARY_TNS_DIC
declare -A STANDBY_TNS_DIC


echo -e "--------------------------------------------------------------------------------"
echo -e "- 各节点主要参数检查                                                "
echo -e "--------------------------------------------------------------------------------\n"

# 内存参数 及 compatible 检查和对比
PARAMS_LIST=(sga_max_size sga_target pga_aggregate_target shared_pool_size db_cache_size streams_pool_size compatible standby_file_management)

for PARAM in ${PARAMS_LIST[@]};
do

PRIMARY_TNS_DIC+=([$PARAM]=`get_params_value $PRIMARY_TNS $PARAM`)
STANDBY_TNS_DIC+=([$PARAM]=`get_params_value $STANDBY_TNS $PARAM`)

# 主从库间对比参数是否相等
compare_value ${PRIMARY_TNS_DIC[$PARAM]} ${STANDBY_TNS_DIC[$PARAM]} $PARAM

done

# 获取其他参数值
PARAMS_LIST=(log_archive_max_processes db_create_file_dest db_file_name_convert log_file_name_convert fal_client fal_server log_archive_config db_recovery_file_dest db_recovery_file_dest_size db_flashback_retention_target)

for PARAM in ${PARAMS_LIST[@]};
do

PRIMARY_TNS_DIC+=([$PARAM]=`get_params_value $PRIMARY_TNS $PARAM`)
STANDBY_TNS_DIC+=([$PARAM]=`get_params_value $STANDBY_TNS $PARAM`)

done

echo -e "\n"

echo -e "--------------------------------------------------------------------------------"
echo -e "- 各节点主要文件数检查                                                          "
echo -e "--------------------------------------------------------------------------------\n"

PRIMARY_TNS_DIC+=([redo_count]=`get_file_count $PRIMARY_TNS "LOG"`)
PRIMARY_TNS_DIC+=([standby_count]=`get_file_count $PRIMARY_TNS "STANDBY_LOG"`)
PRIMARY_TNS_DIC+=([tempfile_count]=`get_file_count $PRIMARY_TNS "TEMPFILE"`)
STANDBY_TNS_DIC+=([redo_count]=`get_file_count $STANDBY_TNS "LOG"`)
STANDBY_TNS_DIC+=([standby_count]=`get_file_count $STANDBY_TNS "STANDBY_LOG"`)
STANDBY_TNS_DIC+=([tempfile_count]=`get_file_count $STANDBY_TNS "TEMPFILE"`)

PRIMARY_TNS_DIC+=([datafile_online_count]=`get_datafile_online_count $PRIMARY_TNS`)
STANDBY_TNS_DIC+=([datafile_online_count]=`get_datafile_online_count $STANDBY_TNS`)

compare_value ${PRIMARY_TNS_DIC[redo_count]} ${STANDBY_TNS_DIC[redo_count]} "redo_count"
compare_value ${PRIMARY_TNS_DIC[standby_count]} ${STANDBY_TNS_DIC[standby_count]} "standby_count"
compare_value ${PRIMARY_TNS_DIC[tempfile_count]} ${STANDBY_TNS_DIC[tempfile_count]} "tempfile_count"
compare_value ${PRIMARY_TNS_DIC[datafile_online_count]} ${STANDBY_TNS_DIC[datafile_online_count]} "datafile_online_count"

echo -e "\n"

echo -e "--------------------------------------------------------------------------------"
echo -e "- 从节点redo日志状态检查                                                        "
echo -e "--------------------------------------------------------------------------------\n"

# 只有从库需要检查
STANDBY_TNS_DIC+=([redo_status_count]=`get_redo_status_count $STANDBY_TNS`)
check_redo_status_count ${STANDBY_TNS_DIC[db_create_file_dest]} ${STANDBY_TNS_DIC[log_file_name_convert]} ${STANDBY_TNS_DIC[redo_status_count]} 
echo -e "\n"


echo -e "--------------------------------------------------------------------------------"
echo -e "- 闪回开启及保留时间检查                                                        "
echo -e "--------------------------------------------------------------------------------\n"

# --------------------------- flashback_on 与 db_flashback_retention_target -------------------------------

PRIMARY_TNS_DIC+=([flashback_on]=`get_flashback_on $PRIMARY_TNS`)
echo -e "- primary database                                                           "
compare_value ${PRIMARY_TNS_DIC[flashback_on]} "NO" "flashback_on"
compare_value ${PRIMARY_TNS_DIC[db_flashback_retention_target]} "4320" "db_flashback_retention_target"

STANDBY_TNS_DIC+=([flashback_on]=`get_flashback_on $STANDBY_TNS`)
echo -e "- standby database                                                                  "
compare_value ${STANDBY_TNS_DIC[flashback_on]} "YES" "flashback_on"
compare_value ${STANDBY_TNS_DIC[db_flashback_retention_target]} "4320" "db_flashback_retention_target"

echo -e "\n"

echo -e "--------------------------------------------------------------------------------"
echo -e "- FRA区设置检查                                                                   "
echo -e "--------------------------------------------------------------------------------\n"

# --------------------------- db_recovery_file_dest 与 db_recovery_file_dest_size -------------------------------
# 主从库设置是否相同
compare_value ${PRIMARY_TNS_DIC[db_recovery_file_dest]} ${STANDBY_TNS_DIC[db_recovery_file_dest]} "db_recovery_file_dest"
compare_value ${PRIMARY_TNS_DIC[db_recovery_file_dest_size]} ${STANDBY_TNS_DIC[db_recovery_file_dest_size]} "db_recovery_file_dest_size"

echo -e "\n"


echo -e "--------------------------------------------------------------------------------"
echo -e "- 各节点主从相关参数检查                                                        "
echo -e "--------------------------------------------------------------------------------\n"

# --------------------------- fal_client 与 fal_server ---------------------------

# fal_server的值应该包括对方，因为${PRIMARY_TNS_DIC[fal_server]}返回值包含逗号，因此需要在传参时加""，避免参数传入函数后被截断

# 主节点参数值
include_value  $PRIMARY_TNS "fal_server" "${PRIMARY_TNS_DIC[fal_server]}" $STANDBY_TNS
# 从节点参数值
include_value  $STANDBY_TNS "fal_server" "${STANDBY_TNS_DIC[fal_server]}" $PRIMARY_TNS

# fal_client的值应该包含自己
# 主节点参数值
include_value  $PRIMARY_TNS "fal_client" "${PRIMARY_TNS_DIC[fal_client]}" $PRIMARY_TNS
# 从节点参数值
include_value  $STANDBY_TNS "fal_client" "${STANDBY_TNS_DIC[fal_client]}" $STANDBY_TNS


# --------------------------- log_archive_config -------------------------------
# 主节点参数值
include_value $PRIMARY_TNS "log_archive_config" ${PRIMARY_TNS_DIC[log_archive_config]} $STANDBY_TNS
# 从节点参数值
include_value $STANDBY_TNS "log_archive_config" ${STANDBY_TNS_DIC[log_archive_config]} $PRIMARY_TNS

# --------------------------- log_archive_max_processes -------------------------------
check_log_archive_max_processes $PRIMARY_TNS ${PRIMARY_TNS_DIC[log_archive_max_processes]} 
check_log_archive_max_processes $STANDBY_TNS ${STANDBY_TNS_DIC[log_archive_max_processes]} 

# --------------------------- log_archive_dest_n 与 log_archive_dest_state_n -------------------------------

check_archive_dest $PRIMARY_TNS
check_archive_dest $STANDBY_TNS

check_archive_dest_state $PRIMARY_TNS
check_archive_dest_state $STANDBY_TNS

# --------------------------- OMF 与 db_file_name_convert,log_file_name_convert -------------------------------

check_omf_and_convert_params $PRIMARY_TNS ${PRIMARY_TNS_DIC[db_create_file_dest]} ${PRIMARY_TNS_DIC[db_file_name_convert]} ${PRIMARY_TNS_DIC[log_file_name_convert]}
check_omf_and_convert_params $STANDBY_TNS ${STANDBY_TNS_DIC[db_create_file_dest]} ${STANDBY_TNS_DIC[db_file_name_convert]} ${STANDBY_TNS_DIC[log_file_name_convert]}

echo -e "\n"


echo -e "--------------------------------------------------------------------------------"
echo -e "- 从节点延迟 MRP进程与触发器检查                                                "
echo -e "--------------------------------------------------------------------------------\n"

check_db_lag $STANDBY_TNS "transport lag"
check_db_lag $STANDBY_TNS "apply lag"

check_mrp_process $STANDBY_TNS

check_mrp_trigger $PRIMARY_TNS
check_mrp_trigger $STANDBY_TNS
echo -e "\n"

echo -e "--------------------------------------------------------------------------------"
echo -e "- dblink检查                                                                   "
echo -e "--------------------------------------------------------------------------------\n"

# --------------------------- dblink -------------------------------
# 检查主库即可
check_dblink $PRIMARY_TNS
echo -e "\n"

2. dg_precheck_func_v1.4.sh

#!/bin/bash

#**********************************************************************************
# Author: Hehuyi_In
# Date: 2022年06月16日
# FileName: dg_precheck_func_v1.4.sh
# 
# Description:
# 2022-06-16 v_1.0 just get and print the infomation we want
# 2022-06-17 v_1.1 auto check the database role
# 2022-06-22 v_1.2 adjust the output format
# 2022-06-28 v_1.3 add compare function, compare two nodes at a time
# 2022-06-28 split to two scripts dg_precheck_main_v1.0.sh and dg_precheck_func_v1.0.sh
# 2022-07-06 dg_precheck_func_v1.1 check os info
# 2022-07-12 dg_precheck_func_v1.2 adjust the output format
# 2022-07-13 dg_precheck_func_v1.3 adjust os info check function
# 2022-10-19 dg_precheck_func_v1.4 add checking items: dblink,standby_file_management,flashback_on,db_flashback_retention_target,db_recovery_file_dest,db_recovery_file_dest_size 
#**********************************************************************************

# 颜色定义
# 红色
ERROR_COLOR='\e[1;31m'
# 绿色
NARMAL_COLOR='\e[1;32m'
# 黄色
WARNING_COLOR='\e[1;33m'
# 重置
RESET_COLOR='\e[0m'

# ------------------------------------------------------------------------
# 检查TNS_LIST中各tnsname对应数据库角色
auto_check_db_role() {
    for TNS in ${TNS_LIST[@]}; do
        DB_ROLE=$(
            sqlplus -s $DBUSER@$TNS as sysdba <<EOF

set heading off feedback off pagesize 0 verify off echo off
select database_role from v\$database;
EOF
        )
        # 主库，则赋值给 PRIMARY_TNS
        if [[ "$DB_ROLE" = "PRIMARY" ]]; then
            PRIMARY_TNS=$TNS
            # 从库，则赋值给 STANDBY_TNS
        elif [[ "$DB_ROLE" = "PHYSICAL STANDBY" ]]; then
            STANDBY_TNS=$TNS
        fi        
    done

    if [[ "$PRIMARY_TNS" = "" ]]; then
       echo -e "${ERROR_COLOR} $(date "+%Y-%m-%d %H:%M:%S") | Error! There is no primary database tns ${RESET_COLOR}"
       exit 1
    elif [[ "$STANDBY_TNS" = "" ]]; then
       echo -e "${ERROR_COLOR} $(date "+%Y-%m-%d %H:%M:%S") | Error! There is no standby database tns ${RESET_COLOR}"
       exit 1
    fi
}

# ----------------------------------获取操作系统信息--------------------------------------
# 参数1：TNS连接串

# get_cpu_info() {
#     sqlplus -s $DBUSER@$1 as sysdba <<EOF
# !cat /proc/cpuinfo | grep "processor" | wc -l
# EOF
# }

# get_memory_info() {
#     sqlplus -s $DBUSER@$1 as sysdba <<EOF
# !free -h | grep 'Mem:' | awk '{print \$2}'
# EOF
# }

# get_disk_info() {
#     sqlplus -s $DBUSER@$1 as sysdba <<EOF
# !df -m | grep -v 'Filesystem' | awk '{sum+=\$2} END {print sum}'
# EOF
# }

# 获取Oracle参数值
# 参数1：TNS连接串，参数2：待检查参数名（不区分大小写）

get_params_value() {
    if [[ "$1" != "" && "$2" != "" ]]; then
        sqlplus -s $DBUSER@$1 as sysdba <<EOF
set heading off feedback off pagesize 0 verify off echo off
select value from v\$parameter where upper(name)=upper('$2');
EOF
    else
        echo -e "${ERROR_COLOR} $(date "+%Y-%m-%d %H:%M:%S") | Error! get_params_value() parameter 1 and 2 can't be null ${RESET_COLOR}"
        exit 1
    fi
}

# log_archive_max_processes 参数检查
# 参数1：TNS连接串，参数2：待检查参数值

check_log_archive_max_processes() {
    if [[ "$1" != "" && "$2" != "" ]]; then
        if [[ "$2" -ge 4 ]]; then
            printf "${NARMAL_COLOR}%-10s | Success | log_archive_max_processes >= 4${RESET_COLOR}\n" $1
        else
            printf "${WARNING_COLOR}%-10s | Warning | log_archive_max_processes < 4${RESET_COLOR}\n" $1
        fi
    else
        echo "${ERROR_COLOR} $(date "+%Y-%m-%d %H:%M:%S") | Error! check_log_archive_max_processes() parameter 1 and 2 can't be null ${RESET_COLOR}"
        exit 1
    fi
}

# 检查log_archive_dest_n参数，是否有设置DELAY关键字（延迟从库）
# 参数1：TNS连接串

check_archive_dest() {
    if [[ "$1" != "" ]]; then
            COUNT=$(
        sqlplus -s $DBUSER@$1 as sysdba <<EOF
set heading off feedback off pagesize 0 verify off echo off
select count(*) FROM v\$parameter where name like 'log_archive_dest%' and upper(value) like '%DELAY%';
EOF
       )
        if [[ "$COUNT" -eq 0 ]]; then
            printf "${NARMAL_COLOR}%-10s | Success | There is no DELAY attribute in log_archive_dest_n${RESET_COLOR}\n" $1
        else
            printf "${WARNING_COLOR}%-10s | Warning | There is DELAY attribute in log_archive_dest_n${RESET_COLOR}\n" $1
        fi
    else
        echo -e "${ERROR_COLOR} $(date "+%Y-%m-%d %H:%M:%S") | Error! check_archive_dest() parameter 1 can't be null ${RESET_COLOR}"
        exit 1
    fi
}

# 检查log_archive_dest_state_n参数，是否有设置DEFER
# 参数1：TNS连接串

check_archive_dest_state() {
    if [[ "$1" != "" ]]; then
            COUNT=$(
        sqlplus -s $DBUSER@$1 as sysdba <<EOF
set heading off feedback off pagesize 0 verify off echo off
select count(*) FROM v\$parameter where name like 'log_archive_dest_state%' and upper(value)='DEFER';
EOF
       )
        if [[ "$COUNT" -eq 0 ]]; then
            printf "${NARMAL_COLOR}%-10s | Success | There is no DEFER value in log_archive_dest_state_n${RESET_COLOR}\n" $1 
        else
            printf "${WARNING_COLOR}%-10s | Warning | There is DEFER value in log_archive_dest_state_n${RESET_COLOR}\n" $1
        fi
    else
        echo -e "${ERROR_COLOR} $(date "+%Y-%m-%d %H:%M:%S") | Error! check_archive_dest_state() parameter 1 can't be null ${RESET_COLOR}"
        exit 1
    fi
}

# OMF与convert参数检查
# 参数1：TNS连接串；参数2：db_create_file_dest参数值；参数3：db_file_name_convert参数值；参数4：log_file_name_convert参数值

check_omf_and_convert_params() {
    if [[ "$2" != ""  ]]; then
             printf "${NARMAL_COLOR}%-10s | Success | db_create_file_dest parameter was set${RESET_COLOR}\n" $1
    else
        if [[ "$3" != "" && "$4" != "" ]]; then
            printf "${NARMAL_COLOR}%-10s | Success | dbfile and logfile convert parameters were set${RESET_COLOR}\n" $1
        else
            printf "${WARNING_COLOR}%-10s | Warning | db_create_file_dest,dbfile and logfile convert parameters were set${RESET_COLOR}\n" $1
        fi
    fi
}

# 获取各类文件数 
# 参数1：TNS连接串，参数2：待查询视图名（V$LOG V$STANDBY_LOG V$TEMPFILE）

get_file_count() {
    if [[ "$1" != "" ]]; then
        sqlplus -s $DBUSER@$1 as sysdba <<EOF
set heading off feedback off pagesize 0 verify off echo off
SELECT count(*) FROM V\$$2;
EOF
    else
        echo -e "${ERROR_COLOR} $(date "+%Y-%m-%d %H:%M:%S") | Error! get_file_count() parameter 1 and 2 can't be null ${RESET_COLOR}"
        exit 1
    fi
}

# 获取指定状态的redo文件数
# 参数1：TNS连接串

get_redo_status_count() {
    if [[ "$1" != "" ]]; then
        sqlplus -s $DBUSER@$1 as sysdba <<EOF
set heading off feedback off pagesize 0 verify off echo off
SELECT count(*) FROM V\$LOG WHERE STATUS NOT IN ('UNUSED', 'CLEARING','CLEARING_CURRENT');
EOF
    else
        echo -e "${ERROR_COLOR} $(date "+%Y-%m-%d %H:%M:%S") | Error! get_redo_status_count() parameter 1 can't be null ${RESET_COLOR}"
        exit 1
    fi
}

# 检查指定状态的redo文件数
# 参数1：db_create_file_dest参数值；参数2：log_file_name_convert参数值；参数3：${STANDBY_TNS_DIC[redo_status_count]} 

check_redo_status_count() {
    # 如果设置了OMF或者LOG_FILE_NAME_CONVERT，则可以跳过此步骤
    if [[ "$1" != "" || "$2" != "" ]]; then
            printf "${NARMAL_COLOR}%-30s | %-8s | There is no need to check this item${RESET_COLOR}\n" redo_status_count Success
    else
        # 否则，指定状态的redo文件数应该为0
        if [[ "$3" -eq 0 ]]; then
            printf "${WARNING_COLOR}%-30s | %-8s | redo_status_count value is 0${RESET_COLOR}\n" redo_status_count Warning
        else
            # 否则，发出告警
            printf "${WARNING_COLOR}%-30s | %-8s | redo_status_count value is not 0${RESET_COLOR}\n" $1 Warning
        fi
    fi
}

# 获取online状态的数据文件数量
# 参数1：TNS连接串

get_datafile_online_count() {
    if [[ "$1" != "" ]]; then
        sqlplus -s $DBUSER@$1 as sysdba <<EOF
set heading off feedback off pagesize 0 verify off echo off
SELECT count(*) FROM V\$DATAFILE WHERE STATUS='ONLINE';
EOF
    else
        echo -e "${ERROR_COLOR} $(date "+%Y-%m-%d %H:%M:%S") | Error! get_datafile_online_count() parameter 1 can't be null ${RESET_COLOR}"
        exit 1
    fi
}

# 获取数据库闪回功能开启状态
# 参数1：TNS连接串
get_flashback_on() {
    if [[ "$1" != "" ]]; then
        sqlplus -s $DBUSER@$1 as sysdba <<EOF
set heading off feedback off pagesize 0 verify off echo off
SELECT FLASHBACK_ON FROM V\$DATABASE;
EOF
    else
        echo -e "${ERROR_COLOR} $(date "+%Y-%m-%d %H:%M:%S") | Error! get_flashback_on() parameter 1 can't be null ${RESET_COLOR}"
        exit 1
    fi
}

# mrp触发器检查
# 参数1：TNS连接串

check_mrp_trigger() {
    if [[ "$1" != "" ]]; then
        COUNT=$(
            sqlplus -s $DBUSER@$1 as sysdba <<EOF
set heading off feedback off pagesize 0 verify off echo off
select count(*) FROM dba_triggers where trigger_name in ('AUTO_START_STANDBY_MRP','AUTO_START_STANDBY_MRP_PDB');
EOF
       )
        if [[ "$COUNT" -eq 0 ]]; then
            printf "${ERROR_COLOR}%-10s | %-8s | There is no MRP trigger${RESET_COLOR}\n" $1 Error
        else
            printf "${NARMAL_COLOR}%-10s | %-8s | MRP trigger was found${RESET_COLOR}\n" $1 Success
        fi
    else
        echo -e "${ERROR_COLOR}$(date "+%Y-%m-%d %H:%M:%S") | Error! check_mrp_trigger() parameter 1 can't be null ${RESET_COLOR}"
        exit 1
    fi
}

# mrp进程检查
# 参数1：TNS连接串

check_mrp_process() {
    if [[ "$1" != "" ]]; then
        COUNT=$(
            sqlplus -s $DBUSER@$1 as sysdba <<EOF
set heading off feedback off pagesize 0 verify off echo off
select count(*) FROM v\$managed_standby where process like 'MRP%';
EOF
        )
        if [[ "$COUNT" -eq 0 ]]; then
            printf "${ERROR_COLOR}%-10s | %-8s | There is no MRP process${RESET_COLOR}\n" $1 Error
        else
            printf "${NARMAL_COLOR}%-10s | %-8s | MRP process was found${RESET_COLOR}\n" $1 Success
        fi

    else
        echo -e "${ERROR_COLOR} $(date "+%Y-%m-%d %H:%M:%S") | Error! check_mrp_process() parameter 1 can't be null ${RESET_COLOR}"
        exit 1
    fi
}

# 检查从库延迟（transport lag,apply lag ）
# 参数1：TNS连接串，参数2：待检查的lag类型

check_db_lag(){
if [[ "$1" != "" && "$2" != "" ]]	
then
DB_LAG=`sqlplus -s $DBUSER@$1 as sysdba << EOF 

set heading off feedback off pagesize 0 verify off echo off
select (extract(second from to_dsinterval(value)) + 
       extract(minute from to_dsinterval(value)) * 60 +
       extract(hour from to_dsinterval(value)) * 60 * 60 +
       extract(day from to_dsinterval(value)) * 60 * 60 * 24) as retvalue
from v\\$dataguard_stats 
where name = '$2';

EOF`

#去除左侧空格
DB_LAG=`eval echo $DB_LAG`

if [[ "$DB_LAG" -gt 30 ]]
then
    printf "${WARNING_COLOR}%-10s | %-8s | the $2 is too large($DB_LAG seconds)${RESET_COLOR}\n" $1 Warning
else 
    printf "${NARMAL_COLOR}%-10s | %-8s | the $2 is $DB_LAG second(s)${RESET_COLOR}\n" $1 Success
fi

else
    echo -e "${ERROR_COLOR} $(date "+%Y-%m-%d %H:%M:%S") | Error! check_db_lag() parameter 1 and 2 can't be null ${RESET_COLOR}"
    exit 1  
fi
}

# dblink检查
# 参数1：TNS连接串

check_dblink() {
    if [[ "$1" != "" ]]; then
        COUNT=$(
            sqlplus -s $DBUSER@$1 as sysdba <<EOF
set heading off feedback off pagesize 0 verify off echo off
select count(*) FROM dba_db_links;
EOF
       )
        if [[ "$COUNT" -eq 0 ]]; then
            printf "${NARMAL_COLOR}%-10s | %-8s | There is no dblink in our database${RESET_COLOR}\n" $1 Success
        else
            printf "${WARNING_COLOR}%-10s | %-8s | dblink was found,please check the tns file and firewall${RESET_COLOR}\n" $1 Warning
        fi
    else
        echo -e "${ERROR_COLOR}$(date "+%Y-%m-%d %H:%M:%S") | Error! check_mrp_trigger() parameter 1 can't be null ${RESET_COLOR}"
        exit 1
    fi
}

# 对比两个值是否相等
# 参数1：待比较值1，参数2：待比较值2
compare_value() {

    if [[ "$1" = "$2" ]]; then
        printf "${NARMAL_COLOR}%-30s | %-8s | The value is $1 ${RESET_COLOR}\n" $3 Success
    else
        printf "${WARNING_COLOR}%-30s | %-8s | The value 1 is: $1,but value 2 is: $2 ${RESET_COLOR}\n" $3 Warning
    fi
}


# 待判断参数值中是否包含给定的子字符串
# 参数1：TNS连接串；参数2：待判断参数名；参数3：待判断参数值；参数3：子字符串
# 例如：include_value $PRIMARY_TNS "fal_server" "${PRIMARY_TNS_DIC[fal_server]}" $STANDBY_TNS

include_value(){
    # 过滤结果
    cnt=`echo $3 | grep $4 | wc -l`

    if [[ "$cnt" -gt 0 ]]; then
        printf "${NARMAL_COLOR}%-10s | %-8s| %-20s | The value is $3,include $4 ${RESET_COLOR}\n" $1 Success $2
    else
        printf "${WARNING_COLOR}%-10s | %-8s| %-20s | The value is $3,doesn't include $4 ${RESET_COLOR}\n" $1 Warning $2
    fi
}

3. 执行效果

二、 执行切换

1. dg_switchover_v1.4.sh

#!/bin/bash

#**********************************************************************************
# Author: Hehuyi_In
# Date: 2022年06月10日
# FileName: dg_switchover_v1.4.sh
# 
# For sys user, execute the script directly. 
# For other sysdba privileged users, you need to manually synchronize the password file to standby server and chown file mode to 640 in versions below 12.2.
#
# Example: ./dg_switchover_v1.4.sh or ./dg_switchover_v1.4.sh &>> dg_switchover.log 
# Description: 
# 2022-06-10 v_1.0 only oracle dataguard switchover
# 2022-06-10 v_1.1 check instance status and db role after switchover.
# 2022-06-10 v_1.2 check transport lag,apply lag,switchover_status before switchover.
# 2022-06-13 v_1.3 add logging for main steps 
# 2022-06-14 v_1.4 auto check and select the target primary and standby database.
#**********************************************************************************

# 连接信息
DBUSER='sys/xxxxx'

# TNS列表，越靠前的被选为目标主库的概率较高
TNS_LIST=(mrptest mrptest_dg mrpuat)

# 列表元素个数检查，目前仅支持一主一从或一主两从
if [[ ${#TNS_LIST[@]} -lt 2 || ${#TNS_LIST[@]} -gt 3 ]]
then
	echo "`date "+%Y-%m-%d %H:%M:%S"` | Error! The number of standby db is less than 1 or greater than 2."
fi

# ------------------------------------------------------------------------
# 判断 TNS_LIST 中每个连接串角色，并设置各切换目标参数
# 若为主库，则作为TARGET_STANDBY_TNS
# 若为从库，则检查lag。如果lag均为0，则作为TARGET_PRIMARY_TNS，剩余的从库作为OUTLOOKING_STANDBY_TNS
# 如果所有从库lag都大于0，则报错退出。

auto_set_target_db_tns(){
	
	for TNS in ${TNS_LIST[@]}
	do
	    # 获取TNS对应db角色
		DB_ROLE=`check_db_role $TNS`

		# 若为主库，则赋值给TARGET_STANDBY_TNS
		if [[ "$DB_ROLE" = "PRIMARY" ]]
		then
			TARGET_STANDBY_TNS=$TNS			
		# 若为从库
		elif [[ "$DB_ROLE" = "PHYSICAL STANDBY" ]]
		then
			    # 如果TARGET_PRIMARY_TNS不为空，说明已经设置过了目标主库，直接设置旁观从库即可
				if [[ "$TARGET_PRIMARY_TNS" != "" ]]
				then
					OUTLOOKING_STANDBY_TNS=$TNS				
				else 
				    # 若TARGET_PRIMARY_TNS为空，则需要再检查lag
					DB_TRAN_LAG=`check_db_lag $TNS "transport lag"`
					DB_APPLY_LAG=`check_db_lag $TNS "apply lag"`
			
				    # 如果lag均为0，则赋值给TARGET_PRIMARY_TNS
					if [[ "$DB_TRAN_LAG" -eq 0 && "$DB_APPLY_LAG" -eq 0 ]]
					then
						TARGET_PRIMARY_TNS=$TNS
					fi	
				fi
		fi
	done

    # 设置后检查，若TARGET_PRIMARY_TNS或TARGET_STANDBY_TNS为空，直接报错退出
	if [[ "$TARGET_PRIMARY_TNS" = "" || "$TARGET_STANDBY_TNS" = "" ]]	
    then
		echo "`date "+%Y-%m-%d %H:%M:%S"` | Error! TARGET_PRIMARY_TNS and TARGET_STANDBY_TNS can't be null."
  		exit 1  		
	fi

}

# ------------------------------------------------------------------------
# 检查从库延迟（transport lag,apply lag ）
# 参数1为db对应的tnsname，参数2为待检查的lag
check_db_lag(){
if [[ "$1" != "" && "$2" != "" ]]	
then
sqlplus -s $DBUSER@$1 as sysdba << EOF 
set heading off feedback off pagesize 0 verify off echo off
select (extract(second from to_dsinterval(value)) + 
       extract(minute from to_dsinterval(value)) * 60 +
       extract(hour from to_dsinterval(value)) * 60 * 60 +
       extract(day from to_dsinterval(value)) * 60 * 60 * 24) as retvalue
from v\$dataguard_stats 
where name = '$2';
EOF

else
    echo "`date "+%Y-%m-%d %H:%M:%S"` | Error! parameter 1,2 can't be null."
    exit 1  
fi
}

# ------------------------------------------------------------------------

# 检查切换前switchover_status
# 参数1为db对应的tnsname，参数2为待检查的状态
check_switchover_status(){
if [[ "$1" != "" && "$2" != "" ]]	
then
STATUS=`sqlplus -s $DBUSER@$1 as sysdba << EOF 
set heading off feedback off pagesize 0 verify off echo off
select switchover_status from v\\$database;
EOF`

if [[ "$STATUS" = $2 || "$STATUS" = "SESSIONS ACTIVE" ]]
then
    echo "`date "+%Y-%m-%d %H:%M:%S"` | Success! switchover_status of $1 is $STATUS."
else 
    echo "`date "+%Y-%m-%d %H:%M:%S"` | Error! switchover_status of $1 is $STATUS (should be $2 or SESSIONS ACTIVE)."
    exit 1
fi

else
    echo "`date "+%Y-%m-%d %H:%M:%S"` | Error! parameter 1 and 2 can't be null."
    exit 1  
fi
}

# ------------------------------------------------------------------------
# 检查db角色，参数1为db对应的tnsname

check_db_role(){
if [[ "$1" != "" ]]	
then
sqlplus -s $DBUSER@$1 as sysdba << EOF 

set heading off feedback off pagesize 0 verify off echo off
select database_role from v\$database;
EOF

else
    echo "`date "+%Y-%m-%d %H:%M:%S"` | Error! parameter 1 should be tnsname."
    exit 1  
fi
}

# ------------------------------------------------------------------------
# 检查切换后实例状态
# 参数1为db对应的tnsname

check_instance_status(){
if [[ "$1" != "" ]]	
then
STATUS=`sqlplus -s $DBUSER@$1 as sysdba << EOF 

set heading off feedback off pagesize 0 verify off echo off
select status from v\\$instance;

EOF`

if [[ "$STATUS" != "OPEN" ]]
then
    echo "`date "+%Y-%m-%d %H:%M:%S"` | Error! instance status of $1 is $STATUS after switchover."
    exit 1
else 
    echo "`date "+%Y-%m-%d %H:%M:%S"` | Success! instance status of $1 is $STATUS after switchover."
fi

else
    echo "`date "+%Y-%m-%d %H:%M:%S"` | Error! parameter 1 can't be null."
    exit 1  
fi
}

# ------------------------------- main() -----------------------------------------

echo "------------------------------------------------------------------------"
echo "`date "+%Y-%m-%d %H:%M:%S"` | Precheck before switchover..."

# 判断 TNS_LIST 中每个连接串角色，并设置各切换目标参数
auto_set_target_db_tns

# 设置后各目标参数值
echo "`date "+%Y-%m-%d %H:%M:%S"` | TARGET_PRIMARY_TNS: $TARGET_PRIMARY_TNS"
echo "`date "+%Y-%m-%d %H:%M:%S"` | TARGET_STANDBY_TNS: $TARGET_STANDBY_TNS"
echo "`date "+%Y-%m-%d %H:%M:%S"` | OUTLOOKING_STANDBY_TNS: $OUTLOOKING_STANDBY_TNS"

# 切换前switchover_status检查
check_switchover_status $TARGET_STANDBY_TNS "TO STANDBY"

# 目标从库（原主库）执行：将原主库转切为从库
echo "`date "+%Y-%m-%d %H:%M:%S"` | Begin switchover $TARGET_STANDBY_TNS to standby database..."
    
sqlplus -s $DBUSER@$TARGET_STANDBY_TNS as sysdba << EOF 
alter database commit to switchover to standby with session shutdown;
shutdown immediate
EOF

echo "`date "+%Y-%m-%d %H:%M:%S"` | Restarting $TARGET_STANDBY_TNS database..."

# 重新启动目标从库
sqlplus -s $DBUSER@$TARGET_STANDBY_TNS as sysdba << EOF 
startup
EOF

# 切换后角色检查
DB_ROLE=`check_db_role $TARGET_STANDBY_TNS`

if [[ "$DB_ROLE" != "PHYSICAL STANDBY" ]]; 
then
    echo "`date "+%Y-%m-%d %H:%M:%S"` | Error! db role of $TARGET_STANDBY_TNS is $DB_ROLE(should be PHYSICAL STANDBY) after switchover."
    exit 1
else 
    echo "`date "+%Y-%m-%d %H:%M:%S"` | Success! db role of $TARGET_STANDBY_TNS is $DB_ROLE after switchover."
fi

# 切换后实例状态检查
check_instance_status $TARGET_STANDBY_TNS

echo "`date "+%Y-%m-%d %H:%M:%S"` | Finish switchover $TARGET_STANDBY_TNS to standby database."

# ------------------------------------------------------------------------

echo "`date "+%Y-%m-%d %H:%M:%S"` | Precheck before switchover $TARGET_PRIMARY_TNS to primary database..."

# 切换前switchover_status检查
check_switchover_status $TARGET_PRIMARY_TNS "TO PRIMARY"

# 目标主库（原从库）执行
# 将原从库切为主库

echo "`date "+%Y-%m-%d %H:%M:%S"` | Begin switchover $TARGET_PRIMARY_TNS to primary database..."

sqlplus -s $DBUSER@$TARGET_PRIMARY_TNS as sysdba << EOF 
alter database commit to switchover to primary with session shutdown;
ALTER DATABASE OPEN;
EOF

# 切换后角色检查
DB_ROLE=`check_db_role $TARGET_PRIMARY_TNS`

if [[ "$DB_ROLE" != "PRIMARY" ]]; 
then
    echo "`date "+%Y-%m-%d %H:%M:%S"` | Error! db role of $1 is $DB_ROLE(should be PRIMARY) after switchover."
    exit 1
else 
    echo "`date "+%Y-%m-%d %H:%M:%S"` | Success! db role of $1 is $DB_ROLE after switchover."
fi

# 切换后实例状态检查
check_instance_status $TARGET_PRIMARY_TNS

# 切换后从库lag检查
DB_TRAN_LAG=`check_db_lag $TARGET_STANDBY_TNS "transport lag"`
DB_APPLY_LAG=`check_db_lag $TARGET_STANDBY_TNS "apply lag"`

echo "`date "+%Y-%m-%d %H:%M:%S"` | After switchover: DB_TRAN_LAG is $DB_TRAN_LAG second(s), DB_APPLY_LAG is $DB_APPLY_LAG second(s)"

echo "`date "+%Y-%m-%d %H:%M:%S"` | Finish switchover $TARGET_PRIMARY_TNS to primary database."

# ------------------------------------------------------------------------
# 如果有旁观从库
if [ "$OUTLOOKING_STANDBY_TNS" != "" ]; then

echo "`date "+%Y-%m-%d %H:%M:%S"` | Begin onlooking standby database setting..."

# 目标主库调整参数，指向旁观从库，先清空再设置，否则有可能报参数冲突
sqlplus -s $DBUSER@$TARGET_PRIMARY_TNS as sysdba << EOF 
alter system set LOG_ARCHIVE_DEST_2='';
alter system set LOG_ARCHIVE_DEST_3='';
alter system set LOG_ARCHIVE_DEST_2='SERVICE=$TARGET_STANDBY_TNS ASYNC VALID_FOR=(ONLINE_LOGFILES,PRIMARY_ROLE) DB_UNIQUE_NAME=$TARGET_STANDBY_TNS';
alter system set LOG_ARCHIVE_DEST_3='SERVICE=$OUTLOOKING_STANDBY_TNS ASYNC VALID_FOR=(ONLINE_LOGFILES,PRIMARY_ROLE) DB_UNIQUE_NAME=$OUTLOOKING_STANDBY_TNS';
EOF

# 目标从库调整参数，断开到旁观从库的连接
sqlplus -s $DBUSER@$TARGET_STANDBY_TNS as sysdba << EOF 
alter system set LOG_ARCHIVE_DEST_3='';
alter system set LOG_ARCHIVE_DEST_2='SERVICE=$TARGET_PRIMARY_TNS ASYNC VALID_FOR=(ONLINE_LOGFILES,PRIMARY_ROLE) DB_UNIQUE_NAME=$TARGET_PRIMARY_TNS';
EOF

# 旁观从库调整参数，指向新主库
sqlplus -s $DBUSER@$OUTLOOKING_STANDBY_TNS as sysdba  << EOF 
alter system set LOG_ARCHIVE_DEST_3='';
alter system set LOG_ARCHIVE_DEST_2='SERVICE=$TARGET_PRIMARY_TNS ASYNC VALID_FOR=(ONLINE_LOGFILES,PRIMARY_ROLE) DB_UNIQUE_NAME=$TARGET_PRIMARY_TNS';
EOF

# 切换后旁观从库lag检查
DB_TRAN_LAG=`check_db_lag $OUTLOOKING_STANDBY_TNS "transport lag"`
DB_APPLY_LAG=`check_db_lag $OUTLOOKING_STANDBY_TNS "apply lag"`

echo "`date "+%Y-%m-%d %H:%M:%S"` | After setting: DB_TRAN_LAG is $DB_TRAN_LAG second(s), DB_APPLY_LAG is $DB_APPLY_LAG second(s)"

echo "`date "+%Y-%m-%d %H:%M:%S"` | Finish onlooking standby database setting."

else # 没有旁观从库
echo "`date "+%Y-%m-%d %H:%M:%S"` | There is no onlooking standby database."
fi

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