• 个人总结OLinux上安装oracle11G Data Guard


    一、准备环境

    1、swap要求

    swap最好设置3G以上,如果安装过程中报swap不足,可参考:
    https://www.jianshu.com/p/46635a12c8d0

    2、官网必须安装包列表:

    binutils-2.20.51.0.2-5.11.el6 (x86_64)
    compat-libcap1-1.10-1 (x86_64)
    compat-libstdc++-33-3.2.3-69.el6 (x86_64)
    compat-libstdc++-33-3.2.3-69.el6.i686
    gcc-4.4.4-13.el6 (x86_64)
    gcc-c++-4.4.4-13.el6 (x86_64)
    glibc-2.12-1.7.el6 (i686)
    glibc-2.12-1.7.el6 (x86_64)
    glibc-devel-2.12-1.7.el6 (x86_64)
    glibc-devel-2.12-1.7.el6.i686
    ksh
    libgcc-4.4.4-13.el6 (i686)
    libgcc-4.4.4-13.el6 (x86_64)
    libstdc++-4.4.4-13.el6 (x86_64)
    libstdc++-4.4.4-13.el6.i686
    libstdc++-devel-4.4.4-13.el6 (x86_64)
    libstdc++-devel-4.4.4-13.el6.i686
    libaio-0.3.107-10.el6 (x86_64)
    libaio-0.3.107-10.el6.i686
    libaio-devel-0.3.107-10.el6 (x86_64)
    libaio-devel-0.3.107-10.el6.i686
    make-3.81-19.el6
    sysstat-9.0.4-11.el6 (x86_64)
    Centos6
    binutils-2.23.52.0.1-12.el7.x86_64 
    compat-libcap1-1.10-3.el7.x86_64 
    compat-libstdc++-33-3.2.3-71.el7.i686
    compat-libstdc++-33-3.2.3-71.el7.x86_64
    gcc-4.8.2-3.el7.x86_64 
    gcc-c++-4.8.2-3.el7.x86_64 
    glibc-2.17-36.el7.i686 
    glibc-2.17-36.el7.x86_64 
    glibc-devel-2.17-36.el7.i686 
    glibc-devel-2.17-36.el7.x86_64 
    ksh
    libaio-0.3.109-9.el7.i686 
    libaio-0.3.109-9.el7.x86_64 
    libaio-devel-0.3.109-9.el7.i686 
    libaio-devel-0.3.109-9.el7.x86_64 
    libgcc-4.8.2-3.el7.i686 
    libgcc-4.8.2-3.el7.x86_64 
    libstdc++-4.8.2-3.el7.i686 
    libstdc++-4.8.2-3.el7.x86_64 
    libstdc++-devel-4.8.2-3.el7.i686 
    libstdc++-devel-4.8.2-3.el7.x86_64 
    libXi-1.7.2-1.el7.i686 
    libXi-1.7.2-1.el7.x86_64 
    libXtst-1.2.2-1.el7.i686 
    libXtst-1.2.2-1.el7.x86_64 
    make-3.82-19.el7.x86_64 
    sysstat-10.1.5-1.el7.x86_64 
    centos7

    详细信息参考官网:

    https://docs.oracle.com/cd/E11882_01/install.112/e47689/pre_install.htm#BABCFJFG

    本例子采用Oracle Linux自带的预装包实现:

    详细参考:

    https://docs.oracle.com/cd/E11882_01/install.112/e47689/pre_install.htm#LADBI1091
    
    2.1.5 Installing the Oracle Preinstallation RPM or Oracle Validated RPM with ULN Support
    View Code

    操作系统安装后,使用oracle-rdbms-server-11gR2-preinstall包准备环境

    https://docs.oracle.com/cd/E11882_01/install.112/e47689/pre_install.htm#LADBI1091
    
    Start a terminal session and enter the following command as root, depending on your platform.
    
    Oracle Linux 6:
    
    # yum install oracle-rdbms-server-11gR2-preinstall
    Oracle Linux 5 or Oracle Linux 4:
    
    # yum install oracle-validated
    You should see output indicating that you have subscribed to the Oracle Linux channel, and that packages are being installed. For example:
    
    el5_u6_i386_base
    el5_u6_x86_64_patch
    Oracle Linux automatically creates a standard (not role-allocated) Oracle installation owner and groups, and sets up other kernel configuration settings as required for Oracle installations.
    预装包说明

    选择对应6.5的版本,使enable=1

    [root@Oracle-A ~]# vi /etc/yum
    yum/         yum.conf     yum.repos.d/ 
    
    [root@Oracle-A ~]# vi /etc/yum.repos.d/public-yum-ol6.repo 
    [public_ol6_latest]
    name=Oracle Linux $releasever Latest ($basearch)
    baseurl=http://public-yum.oracle.com/repo/OracleLinux/OL6/latest/$basearch/
    gpgkey=http://public-yum.oracle.com/RPM-GPG-KEY-oracle-ol6
    gpgcheck=1
    enabled=0
    
    [public_ol6_ga_base]
    name=Oracle Linux $releasever GA installation media copy ($basearch)
    baseurl=http://public-yum.oracle.com/repo/OracleLinux/OL6/0/base/$basearch/
    gpgkey=http://public-yum.oracle.com/RPM-GPG-KEY-oracle-ol6
    gpgcheck=1
    enabled=0
    
    [public_ol6_u1_base]
    name=Oracle Linux $releasever Update 1 installation media copy ($basearch)
    baseurl=http://public-yum.oracle.com/repo/OracleLinux/OL6/1/base/$basearch/
    gpgkey=http://public-yum.oracle.com/RPM-GPG-KEY-oracle-ol6
    gpgcheck=1
    enabled=0
    
    [public_ol6_u2_base]
    name=Oracle Linux $releasever Update 2 installation media copy ($basearch)
    baseurl=http://public-yum.oracle.com/repo/OracleLinux/OL6/2/base/$basearch/
    gpgkey=http://public-yum.oracle.com/RPM-GPG-KEY-oracle-ol6
    gpgcheck=1
    enabled=0
    
    [public_ol6_u3_base]
    name=Oracle Linux $releasever Update 3 installation media copy ($basearch)
    baseurl=http://public-yum.oracle.com/repo/OracleLinux/OL6/3/base/$basearch/
    gpgkey=http://public-yum.oracle.com/RPM-GPG-KEY-oracle-ol6
    gpgcheck=1
    enabled=0
    
    [public_ol6_u4_base]
    name=Oracle Linux $releasever Update 4 installation media copy ($basearch)
    baseurl=http://public-yum.oracle.com/repo/OracleLinux/OL6/4/base/$basearch/
    gpgkey=http://public-yum.oracle.com/RPM-GPG-KEY-oracle-ol6
    gpgcheck=1
    enabled=0
    
    [public_ol6_u5_base]
    name=Oracle Linux $releasever Update 5 installation media copy ($basearch)
    baseurl=http://public-yum.oracle.com/repo/OracleLinux/OL6/5/base/$basearch/
    gpgkey=http://public-yum.oracle.com/RPM-GPG-KEY-oracle-ol6
    gpgcheck=1
    enabled=1
    
    [public_ol6_UEK_latest]
    name=Latest Unbreakable Enterprise Kernel for Oracle Linux $releasever ($basearch)
    baseurl=http://public-yum.oracle.com/repo/OracleLinux/OL6/UEK/latest/$basearch/
    gpgkey=http://public-yum.oracle.com/RPM-GPG-KEY-oracle-ol6
    gpgcheck=1
    enabled=$uek
    
    [public_ol6_UEKR3_latest]
    name=Unbreakable Enterprise Kernel Release 3 for Oracle Linux $releasever ($basearch)
    baseurl=http://public-yum.oracle.com/repo/OracleLinux/OL6/UEKR3/latest/$basearch/
    gpgkey=http://public-yum.oracle.com/RPM-GPG-KEY-oracle-ol6
    gpgcheck=1
    enabled=$uekr3
    
    [public_ol6_UEK_base]
    name=Unbreakable Enterprise Kernel for Oracle Linux $releasever ($basearch)
    baseurl=http://public-yum.oracle.com/repo/OracleLinux/OL6/UEK/base/$basearch/
    gpgkey=http://public-yum.oracle.com/RPM-GPG-KEY-oracle-ol6
    gpgcheck=1
    enabled=1
    ~
    "/etc/yum.repos.d/public-yum-ol6.repo" 69L, 2545C written
    View Code
    [root@Oracle-A ~]# yum install oracle-rdbms-server-11gR2-preinstall

     

    校验结果:

    [root@oel63 ~]# cd /var/log/oracle-rdbms-server-11gR2-preinstall/results/
    [root@oel63 results]# ls
    orakernel.log
    [root@oel63 results]# more orakernel.log
    Adding group oinstall with gid 54321
    Adding group dba
    Adding user oracle with user id 54321, initial login group oinstall, supplementary group dba and  home directory /home/oracle
    Changing ownership of /home/oracle to oracle:oinstall
    Please set password for oracle user
    uid=54321(oracle) gid=54321(oinstall) groups=54321(oinstall),54322(dba)
    Creating oracle user passed
    
    Verifying  kernel parameters as per Oracle recommendations...
    Adding fs.file-max = 6815744 
    Adding kernel.sem = 250 32000 100 128 
    Adding kernel.shmmni = 4096 
    kernel.shmall is higher than preinstall config.
    kernel.shmall = 4294967296
    kernel.shmmax = 4398046511104
    Changing kernel.shmmax to match preinstall config
    Adding net.core.rmem_default = 262144 
    Adding net.core.rmem_max = 4194304 
    Adding net.core.wmem_default = 262144 
    Adding net.core.wmem_max = 1048576 
    Adding fs.aio-max-nr = 1048576 
    Adding net.ipv4.ip_local_port_range = 9000 65500 
    Setting kernel parameters as per oracle recommendations...
    Altered file /etc/sysctl.conf
    Original file backed up at /etc/sysctl.conf.orabackup
    Verifying & setting of kernel parameters passed
    
    Setting user limits using /etc/security/limits.conf
    
    Verifying oracle user OS limits as per Oracle recommendations...
    Adding oracle soft nofile  1024
    Adding oracle hard nofile  65536
      .............
    
    Setting kernel boot parameters as per Oracle recommendations...
    Boot parameters will be effected on next reboot
    Altered file /boot/grub/grub.conf
    Original file backed up at /boot/grub/grub.conf.orabackup
    Verifying & setting of boot parameters passed
    
    Disabling Transparent Hugepages. 
    Refer Oracle Note:1557478.1
    
    Disabling defrag. 
    Refer Oracle Note:1557478.1
    
    Taking a backup of old config files under /var/log/oracle-rdbms-server-11gR2-preinstall/backup/May-16-2014-14-53-37 
    #最后一句给出了相关的备份信息 
    
    #下面是查看备份文件
    [root@oel63 results]# cd /var/log/oracle-rdbms-server-11gR2-preinstall/backup
    [root@oel63 backup]# ls
    May-16-2014-14-53-37
    [root@oel63 backup]# cd May-16-2014-14-53-37/
    [root@oel63 May-16-2014-14-53-37]# ls
    grub.conf  limits.conf  orakernel.log  sysctl.conf
    
    #校验Oracle用户,注,需要为Oracle用户修改密码,此处省略
    [root@oel63 ~]# cat /etc/passwd |grep oracle
    oracle:x:54321:54321::/home/oracle:/bin/bash
    [root@oel63 ~]# cat /etc/group |grep dba      
    dba:x:54322:oracle
    [root@oel63 ~]# cat /etc/group |grep oinstall
    oinstall:x:54321: 

    参考链接:

    How I Simplified Oracle Database 12c and 11g Installations on Oracle Linux 6

    How I Simplified Oracle Database Installation on Oracle Linux 5

    Oracle 11g 在RedHat Linux 5.8_x64平台的安装手册 http://www.linuxidc.com/Linux/2014-07/104745.htm

    Linux-6-64下安装Oracle 12C笔记 http://www.linuxidc.com/Linux/2013-07/86805.htm

    CentOS 6.4下安装Oracle 11gR2(x64) http://www.linuxidc.com/Linux/2014-02/97374.htm

    Oracle 11gR2 在VMWare虚拟机中安装步骤 http://www.linuxidc.com/Linux/2013-09/89579p2.htm

    Debian 下 安装 Oracle 11g XE R2 http://www.linuxidc.com/Linux/2014-03/98881.htm

    更多Oracle相关信息见Oracle 专题页面 http://www.linuxidc.com/topicnews.aspx?tid=12

    本文永久更新链接地址http://www.linuxidc.com/Linux/2014-09/106127.htm

     二、安装数据库软件

    创建所需目录:

    Oracle Base Directory:
    [root@Oracle-A /]# mkdir -p /u01/app/oracle

    Oracle Inventory Directory:
    [root@Oracle-A /]# mkdir -p /u01/app/oraInventory

    Oracle Home Directory:
    [root@Oracle-A /]# mkdir -p /u01/app/oracle/product/11.2.0/db_1

    可选:
    Direcotories for Oracle DATA or Recovery Files:
    [root@Oracle-A /]# mkdir -p /u01/oradata
    [root@Oracle-A /]# mkdir -p /u01/fast_recovery_area
    本例中使用默认的$oracle_base/flash_recovery_area
    Software Installation Directories
    You must specify the directory in which the Oracle Database software is installed, or the location where the product binary files are copied from the installation media. You must choose a location that has enough disk space to contain the software and is accessible by the operating system user performing the installation.
    
    You also specify the location of the Oracle base directory, which is used by all Oracle software products installed on the server. The first time you install Oracle Database software on a server, you are prompted to specify the location of the inventory directory, called oraInventory. This directory provides a centralized inventory of all Oracle software products installed on the server. You should use the same value for the Oracle inventory directory each time you perform an Oracle software installation on the server.
    文档中的目录说明

    修改目录属性:

    chown -R oracle.oinstalll /u01

    修改环境变更

    # vi /home/oracle/.bash_profile  #添加如下内容
    
    ORACLE_BASE=/u01/app/oracle;
    export ORACLE_BASE
    ORACLE_HOME=$ORACLE_BASE/product/11.2.0/db_1;
    export ORACLE_HOME
    ORACLE_SID=orcl;
    export ORACLE_SID
    LD_LIBRARY_PATH=$ORACLE_HOME/lib;
    export LD_LIBRARY_PATH
    PATH=$PATH:$ORACLE_HOME/bin:$HOME/bin;
    export PATH

    修改/etc/hosts文件

    [root@Oracle-A tmp]# vi /etc/hosts
    127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4
    ::1 localhost localhost.localdomain localhost6 localhost6.localdomain6
    192.168.56.201 Oracle-A

    上传安装文件

    [root@Oracle-A tmp]# unzip p13390677_112040_Linux-x86-64_1of7.zip
    [root@Oracle-A tmp]# unzip p13390677_112040_Linux-x86-64_2of7.zip
    [root@Oracle-A tmp]# xhost +
    [root@Oracle-A tmp]$ export DISPLAY=192.168.56.1:0.0
    [oracle@Oracle-A 11.2.0]$ cd /tmp/database/   

    配置xmanager

    设置好连接后,在命令输入如下内容:

    /usr/bin/xterm -ls -display $DISPLAY

    用Xstart命令行中启动安装程序

    成功后,调用出安装界面,忘记修改/etc/hosts/时,会报如下图的错误

    安装过程,本例先安装软件,再创建数据库。

    开始进行安装。

     最后运行两个脚本

    VirtualBox克隆另一台虚拟机

    复制时候,选择重新初始化所有MAC地址

    配置从库的主机信息。

    删除UUID

     如果网络不通,可以采取以下两种方法,我用的第1种,直接删除: 

    解决办法:
    通过查看新VM的文件/etc/udev/rules.d/70-persistent-net.rules,发现多了几个网卡接口,我们每更新一次网卡MAC地址,都只会在该文件内追加信息。我们有两种方法解决该问题:
    1. 删除70-persistent-net.rules文件,重启;
    2. 我们只需按照新VM的设置信息将70-persistent-net.rules文件内的多余网卡去掉,然后将正确MAC地址那一行改为对应于eth0即可,然后重启;
    View Code

    主库上创建数据库,发现不认dbca命令

    oracle@edrsr12p1 Desktop]$ . oraenv
    ORACLE_SID = [orcl] ? orcl 
    ORACLE_HOME = [/home/oracle] ? /u01/app/oracle/product/11.2.0/dbhome_1
    The Oracle base remains unchanged with value /u01/app/oracle
    [oracle@edrsr12p1 Desktop]$ dbca
    View Code

    修改Standby的环境变量

    修改后正常:

    字符集选择时,要慎重。

    创建监听:

    $netca,第一个listener一路回车即可。

    SQL> desc v$instance;
     Name                                      Null?    Type
     ----------------------------------------- -------- ----------------------------
     INSTANCE_NUMBER                                    NUMBER
     INSTANCE_NAME                                      VARCHAR2(16)
     HOST_NAME                                          VARCHAR2(64)
     VERSION                                            VARCHAR2(17)
     STARTUP_TIME                                       DATE
     STATUS                                             VARCHAR2(12)
     PARALLEL                                           VARCHAR2(3)
     THREAD#                                            NUMBER
     ARCHIVER                                           VARCHAR2(7)
     LOG_SWITCH_WAIT                                    VARCHAR2(15)
     LOGINS                                             VARCHAR2(10)
     SHUTDOWN_PENDING                                   VARCHAR2(3)
     DATABASE_STATUS                                    VARCHAR2(17)
     INSTANCE_ROLE                                      VARCHAR2(18)
     ACTIVE_STATE                                       VARCHAR2(9)
     BLOCKED                                            VARCHAR2(3)
    
    SQL> select instance_name from v$instance;
    
    INSTANCE_NAME
    ----------------
    orcl
    View Code

    完成安装后,开始安装物理DATAGuard,先调整主库

    1、Enable force logging

    SQL> alter database force logging;
    
    Database altered.

    SQL> select force_logging from v$database;

    
    

    FOR
    ---
    YES

    2、查询当前日志组和文件分布并创建转化为备库时使用的redo log文件,要求Standby redo log的组数要多于online redo log,并且二者的日志文件大小相同。

    SQL> col member format a50
    SQL> select group#,member from v$logfile;
    
        GROUP# MEMBER
    ---------- --------------------------------------------------
             3 /u01/app/oracle/oradata/orcl/redo03.log
             2 /u01/app/oracle/oradata/orcl/redo02.log
             1 /u01/app/oracle/oradata/orcl/redo01.log

    SQL> select group#,bytes/(1024*1024) from v$log;

    GROUP# BYTES/(1024*1024)
    ---------- -----------------
    1 50
    2 50
    3 50


    SQL> alter database add standby logfile
    2 group 4 '/u01/app/oracle/oradata/orcl/std_redo04.log' size 50m;

    Database altered.

    SQL> alter database add standby logfile
    2 group 5 '/u01/app/oracle/oradata/orcl/std_redo05.log' size 50m;

    Database altered.

    SQL> alter database add standby logfile
    2 group 6 '/u01/app/oracle/oradata/orcl/std_redo06.log' size 50m;

    Database altered.

    SQL> alter database add standby logfile
    2 group 7 '/u01/app/oracle/oradata/orcl/std_redo07.log' size 50m;

    Database altered.

    查看一下当前的redo log

    SQL> select member from v$logfile;

    MEMBER
    --------------------------------------------------
    /u01/app/oracle/oradata/orcl/redo03.log
    /u01/app/oracle/oradata/orcl/redo02.log
    /u01/app/oracle/oradata/orcl/redo01.log
    /u01/app/oracle/oradata/orcl/std_redo04.log
    /u01/app/oracle/oradata/orcl/std_redo05.log
    /u01/app/oracle/oradata/orcl/std_redo06.log
    /u01/app/oracle/oradata/orcl/std_redo07.log

      注:Standby redo log 的组数参考公式:(online redolog级数+1)*数据库线程数,RAC线程为2.

    Standby redolog的组成员数和大小也尽量和online redo一样。

    设置主库初始化参数

    SQL> create pfile from spfile;
    
    File created.
    
    SQL> !
    [oracle@Oracle-A bin]$ ls -l $ORACLE_HOME/dbs
    total 24
    -rw-rw---- 1 oracle oinstall 1544 Jun 23 14:54 hc_orcl.dat
    -rw-r--r-- 1 oracle oinstall 2851 May 15  2009 init.ora
    -rw-r--r-- 1 oracle oinstall  938 Jun 23 15:43 initorcl.ora #新创建的
    -rw-r----- 1 oracle oinstall   24 Jun 23 14:52 lkORCL
    -rw-r----- 1 oracle oinstall 1536 Jun 23 14:54 orapworcl
    -rw-r----- 1 oracle oinstall 2560 Jun 23 14:55 spfileorcl.ora

    编辑这个生成的初始化参数文件

    查看归档的路径:

    Oracle11g版本,ORACLE默认的日志归档路径为闪回恢复区($ORACLE_BASE/fast_recovery_area)。对于这个路径,Oracle有一个限制,就是默认只有4G的空间,而且不只是归档日志的默认路径,也是备份文件和闪回日志的默认地址,这样的话归档日志锁使用的空间就达不到4G,在没有设置好这个路径大小的情况下,很多系统都遇到过归档日志满而无法归档导致数据库夯住的问题。
    归档路径说明
    SQL> archive log list;
    Database log mode              Archive Mode
    Automatic archival             Enabled
    Archive destination            USE_DB_RECOVERY_FILE_DEST
    Oldest online log sequence     1
    Next log sequence to archive   3
    Current log sequence           3

    这里可以看到Archive destination的值为USE_DB_RECOVERY_FILE_DEST,可以理解为USE(使用)DB_RECOVERY_FILE_DEST这个路径

    查看DB_RECOVERY_FILE_DEST路径

    SQL> show parameter db_recovery;
    
    NAME                                 TYPE        VALUE
    ------------------------------------ ----------- ------------------------------
    db_recovery_file_dest                string      /u01/app/oracle/fast_recovery_area
    db_recovery_file_dest_size           big integer 4182M

    下面的参数是空的

    SQL> show parameter log_archive_dest_1;

    NAME TYPE VALUE
    ------------------------------------ ----------- ------------------------------
    log_archive_dest_1 string
    log_archive_dest_10 string
    log_archive_dest_11 string
    log_archive_dest_12 string
    log_archive_dest_13 string
    log_archive_dest_14 string
    log_archive_dest_15 string
    log_archive_dest_16 string
    log_archive_dest_17 string
    log_archive_dest_18 string
    log_archive_dest_19 string

     

     由上可以很清楚的看到DB_RECOVERY_FILE_DEST路径参数的值默认为/u01/oracle/fast_recovery_area,并且Oracle设置的大小为4G。
    默认情况下,归档日志会存放到闪回恢复区($ORACLE_BASE/fast_recovery_area)内,如果闪回恢复区已经使用到4G,归档日志就有可能无法继续归档,数据库夯住。

    具体参考:https://blog.csdn.net/u011364306/article/details/49276717

    
    
    vi /u01/app/oracle/product/11.2.0/db_1/dbs/initorcl.ora

    以下为增加内容:

    db_unique_name=orcl
    log_archive_config='dg_config=(orcl,orclstdby)'
    log_archive_dest_1='location=/u01/app/oracle/fast_recovery_area valid_for=(all_logfiles,all_roles) db_unique_name=orcl'
    log_archive_dest_2='service=orclstdby lgwro async valid_for=(online_logfiles,primary_roles) db_unique_name=orclstdby'   #lgwro async选一
    log_archive_dest_state_1=enable
    log_archive_dest_stat_2=enable
    db_file_name_convert='/u01/app/oracle/oradata/orclstdby','/u01/app/oracle/oradata/orcl'
    log_file_name_convert='/u01/app/oracle/oradata/orclstdby','/u01/app/oracle/oradata/orcl'
    fal_server=orclstdby
    fal_client=orcl
    standby_file_management=auto
    standby_archive_dest='/u01/app/oracle/fast_recovery_area'

    比原文少了创建相关archive log的目录,这里临时使用默认路径,有问题,后面再修改。

    shutdown 实例

    SQL> shutdown immediate;
    Database closed.
    Database dismounted.
    ORACLE instance shut down.
    View Code

    测试一下参数文件:

    SQL> startup pfile='/u01/app/oracle/product/11.2.0/db_1/dbs/initorcl.ora';    

    再shutdown实例

    启动到mount状态:

    SQL> startup mount pfile='/u01/app/oracle/product/11.2.0/db_1/dbs/initorcl.ora'; 

    [oracle@Oracle-A ~]$ rman target /

    Recovery Manager: Release 11.2.0.4.0 - Production on Mon Jun 25 15:35:31 2018

    Copyright (c) 1982, 2011, Oracle and/or its affiliates. All rights reserved.

    connected to target database: ORCL (DBID=1507351096, not open)

    RMAN>

    编辑standby数据库参数文件

    [oracle@Oracle-A dbs]$ scp initorcl.ora oracle@192.168.56.202:/u01/app/oracle/product/11.2.0/db_1/dbs/initorclstdby.ora

    $vi initorclstdby.ora

    [oracle@Oracle-B dbs]$ vi initorclstdby.ora
    fal_server=orclstdby
    fal_client=orcl
    orcl.__db_cache_size=352321536
    orcl.__java_pool_size=4194304
    orcl.__large_pool_size=8388608
    orcl.__oracle_base='/u01/app/oracle'#ORACLE_BASE set from environment
    orcl.__pga_aggregate_target=335544320
    orcl.__sga_target=503316480
    orcl.__shared_io_pool_size=0
    orcl.__shared_pool_size=125829120
    orcl.__streams_pool_size=0
    *.audit_file_dest='/u01/app/oracle/admin/orcl/adump'
    *.audit_trail='db'
    *.compatible='11.2.0.4.0'
    *.control_files='/u01/app/oracle/oradata/orclstdby/control01.ctl','/u01/app/oracle/fast_recovery_area/orclstdby/control02.ctl'
    *.db_block_size=8192
    *.db_domain=''
    *.db_name='orcl'
    *.db_recovery_file_dest='/u01/app/oracle/fast_recovery_area'
    *.db_recovery_file_dest_size=4385144832
    *.diagnostic_dest='/u01/app/oracle'
    *.dispatchers='(PROTOCOL=TCP) (SERVICE=orclXDB)'
    *.log_archive_format='%t_%s_%r.dbf'
    *.memory_target=838860800
    *.open_cursors=300
    *.processes=150
    *.remote_login_passwordfile='EXCLUSIVE'
    *.undo_tablespace='UNDOTBS1'
    db_unique_name=orclstdby
    log_archive_config='dg_config=(orcl,orclstdby)'
    log_archive_dest_1='location=/u01/app/oracle/fast_recovery_area
    valid_for=(all_logfiles,all_roles) db_unique_name=orclstdby'
    log_archive_dest_2='service=orcl async
    valid_for=(online_logfiles,primary_roles) db_unique_name=orcl'
    log_archive_dest_state_1=enable
    log_archive_dest_state_2=enable
    db_file_name_convert='/u01/app/oracle/oradata/orcl','/u01/app/oracle/oradata/orclstdby'
    log_file_name_convert='/u01/app/oracle/oradata/orcl','/u01/app/oracle/oradata/orclstdby'
    fal_server=orcl
    standby_file_management=auto
    standby_archive_dest='/u01/app/oracle/fast_recovery_area'

    在主库上创建备库的控制文件

    SQL> alter database create standby controlfile as '/u01/app/oracle/oradata/orcl/orclstdby01.ctl';

    在备库上创建对应目录,如backup、归档目录,本例为闪回下,control文件存放目录,并将相应文件复制过去

    cd /u01/app/oracle/oradata/
    mkdir -p orclstdby
    
    scp initorcl.ora oracle@192.168.56.202:/u01/app/oracle/product/11.2.0/db_1/dbs/initorclstdby.ora
    scp /u01/app/oracle/oradata/orcl/orclstdby01.ctl oracle@192.168.56.202:/u01/app/oracle/oradata/orclstdby/
    scp orapworcl oracle@192.168.56.202:/u01/app/oracle/product/11.2.0/db_1/dbs/
    [oracle@Oracle-A dbs]$ scp -r /u01/app/oracle/fast_recovery_area/ORCL oracle@192.168.56.202:/u01/app/oracle/fast_recovery_area/orclstdby/

     经过一系列的目录对比、复制文件、修改参数文件后,终于可以把备库启动到Mount状态

    对备库的参数文件再次修改,控制文件名的名称,不符合:

    *.control_files='/u01/app/oracle/oradata/orclstdby/orclstdby01.ctl','/u01/app/oracle/fast_recovery_area/orclstdby/orclstdby02.ctl'

    SQL> startup mount pfile='/u01/app/oracle/product/11.2.0/db_1/dbs/initorclstdby.ora';

    ORA-32006: STANDBY_ARCHIVE_DEST initialization parameter has been deprecated
    ORACLE instance started.

    Total System Global Area 835104768 bytes
    Fixed Size 2257840 bytes
    Variable Size 536874064 bytes
    Database Buffers 289406976 bytes
    Redo Buffers 6565888 bytes
    Database mounted.

    创建主库和备库的监听,可用图形界面或直接编辑listener.ora

     编辑Net service names,主库和备份库复制即可,监听也折腾了一段时间,图形创建的可以,而手工编辑按文档的不行,后用图形配置后,进行了些更改,OK!

    主库的监听配置文件
    $cd /u01/app/oracle/product/11.2.0/db_1/network/admin

    [oracle@Oracle-A admin]$ cat listener.ora
    # listener.ora Network Configuration File: /u01/app/oracle/product/11.2.0/db_1/network/admin/listener.ora
    # Generated by Oracle configuration tools.
    SID_LIST_LISTENER =
    (SID_LIST =
    (SID_DESC =
    (GLOBAL_DBNAME = orcl)
    (ORACLE_HOME = /u01/app/oracle/product/11.2.0/db_1)
    (SID_NAME = orcl)
    )
    )

    LISTENER =

    (DESCRIPTION_LIST =
    (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.56.201)(PORT = 1521))
    (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521))
    )
    )

    ADR_BASE_LISTENER = /u01/app/oracle

    备库的listener.ora

    [oracle@Oracle-B admin]$ cat listener.ora
    # listener.ora Network Configuration File: /u01/app/oracle/product/11.2.0/db_1/network/admin/listener.ora
    # Generated by Oracle configuration tools.
    SID_LIST_LISTENER =
    (SID_LIST =
    (SID_DESC =
    (GLOBAL_DBNAME = orclstdby)
    (SID_NAME = orclstdby)
    (ORACLE_HOME = /u01/app/oracle/product/11.2.0/db_1)
    )
    )

    LISTENER =
    (DESCRIPTION_LIST =
    (DESCRIPTION =
    (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521))
    )
    (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.56.202)(PORT = 1521))
    )
    )

    编辑tnsnames.ora

    [oracle@Oracle-A admin]$ cat tnsnames.ora 
    orcl =
      (DESCRIPTION=
        (address = (protocol=tcp)(host = 192.168.56.201)(PORT = 1521))
        (connect_data =
          (SERVER = DEDICATED)
          (SERVICE_NAME = orcl)
        )
       )
    
    orclstdby =
      (DESCRIPTION=
        (address = (protocol=tcp)(host = 192.168.56.202)(PORT = 1521))
        (connect_data =
          (SERVER = DEDICATED)
          (SERVICE_NAME = orclstdby)
        )
       ) 

    复制至备库 

    [oracle@Oracle-A admin]$ scp tnsnames.ora oracle@192.168.56.202:/u01/app/oracle/product/11.2.0/db_1/network/admin

    [oracle@Oracle-A admin]$ lsnrctl stop

    oracle@Oracle-A admin]$ lsnrctl start

    LSNRCTL for Linux: Version 11.2.0.4.0 - Production on 26-JUN-2018 21:42:02

    Copyright (c) 1991, 2013, Oracle. All rights reserved.

    Starting /u01/app/oracle/product/11.2.0/db_1//bin/tnslsnr: please wait...

    TNSLSNR for Linux: Version 11.2.0.4.0 - Production
    System parameter file is /u01/app/oracle/product/11.2.0/db_1/network/admin/listener.ora
    Log messages written to /u01/app/oracle/diag/tnslsnr/Oracle-A/listener/alert/log.xml
    Listening on: (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=Oracle-A)(PORT=1521)))
    Listening on: (DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=EXTPROC1521)))

    Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=Oracle-A)(PORT=1521)))
    STATUS of the LISTENER
    ------------------------
    Alias LISTENER
    Version TNSLSNR for Linux: Version 11.2.0.4.0 - Production
    Start Date 26-JUN-2018 21:42:05
    Uptime 0 days 0 hr. 0 min. 0 sec
    Trace Level off
    Security ON: Local OS Authentication
    SNMP OFF
    Listener Parameter File /u01/app/oracle/product/11.2.0/db_1/network/admin/listener.ora
    Listener Log File /u01/app/oracle/diag/tnslsnr/Oracle-A/listener/alert/log.xml
    Listening Endpoints Summary...
    (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=Oracle-A)(PORT=1521)))
    (DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=EXTPROC1521)))
    The listener supports no services
    The command completed successfully

    备库也启动lsnrctl start

    TNSPing测试一下,在主库备库分别操作

    oracle@Oracle-A admin]$ tnsping orclstdby

    TNS Ping Utility for Linux: Version 11.2.0.4.0 - Production on 26-JUN-2018 21:42:48

    Copyright (c) 1997, 2013, Oracle. All rights reserved.

    Used parameter files:


    Used TNSNAMES adapter to resolve the alias
    Attempting to contact (DESCRIPTION= (address = (protocol=tcp)(host = 192.168.56.202)(PORT = 1521)) (connect_data = (SERVER = DEDICATED) (SERVICE_NAME = orclstdby)))
    OK (0 msec)

    [oracle@Oracle-B admin]$ tnsping orcl

    TNS Ping Utility for Linux: Version 11.2.0.4.0 - Production on 26-JUN-2018 21:46:47

    Copyright (c) 1997, 2013, Oracle. All rights reserved.

    Used parameter files:


    Used TNSNAMES adapter to resolve the alias
    Attempting to contact (DESCRIPTION= (address = (protocol=tcp)(host = 192.168.56.201)(PORT = 1521)) (connect_data = (SERVER = DEDICATED) (SERVICE_NAME = orcl)))
    OK (0 msec)

    停掉备库监听

    在备库创建spfile

    
    

    SQL> conn / as sysdba
    Connected to an idle instance.

    SQL> create spfile from pfile

    File created.

    SQL> startup nomount;
    ORA-32004: obsolete or deprecated parameter(s) specified for RDBMS instance
    ORACLE instance started.

    
    

    Total System Global Area 835104768 bytes
    Fixed Size 2257840 bytes
    Variable Size 536874064 bytes
    Database Buffers 289406976 bytes
    Redo Buffers 6565888 bytes
    SQL> alter database mount standby database;

    Database altered. 

    在备库恢复主库备份的数据

    [oracle@Oracle-B dbs]$ rman target /
    
    RMAN> restore database;
    
    Starting restore at 26-JUN-18
    Starting implicit crosscheck backup at 26-JUN-18
    using target database control file instead of recovery catalog
    allocated channel: ORA_DISK_1
    channel ORA_DISK_1: SID=134 device type=DISK
    Crosschecked 4 objects
    Finished implicit crosscheck backup at 26-JUN-18
    
    Starting implicit crosscheck copy at 26-JUN-18
    using channel ORA_DISK_1
    Finished implicit crosscheck copy at 26-JUN-18
    
    searching for all files in the recovery area
    cataloging files...
    no files cataloged
    
    using channel ORA_DISK_1
    
    channel ORA_DISK_1: starting datafile backup set restore
    channel ORA_DISK_1: specifying datafile(s) to restore from backup set
    channel ORA_DISK_1: restoring datafile 00001 to /u01/app/oracle/oradata/orclstdby/system01.dbf
    channel ORA_DISK_1: restoring datafile 00002 to /u01/app/oracle/oradata/orclstdby/sysaux01.dbf
    channel ORA_DISK_1: restoring datafile 00003 to /u01/app/oracle/oradata/orclstdby/undotbs01.dbf
    channel ORA_DISK_1: restoring datafile 00004 to /u01/app/oracle/oradata/orclstdby/users01.dbf
    channel ORA_DISK_1: restoring datafile 00005 to /u01/app/oracle/oradata/orclstdby/example01.dbf
    channel ORA_DISK_1: reading from backup piece /u01/app/oracle/fast_recovery_area/ORCL/backupset/2018_06_25/o1_mf_nnndf_TAG20180625T173322_fm1fq2md_.bkp
    channel ORA_DISK_1: piece handle=/u01/app/oracle/fast_recovery_area/ORCL/backupset/2018_06_25/o1_mf_nnndf_TAG20180625T173322_fm1fq2md_.bkp tag=TAG20180625T173322
    channel ORA_DISK_1: restored backup piece 1
    channel ORA_DISK_1: restore com
    
    RMAN> restore archivelog all;
    
    Starting restore at 26-JUN-18
    using channel ORA_DISK_1
    
    channel ORA_DISK_1: starting archived log restore to default destination
    channel ORA_DISK_1: restoring archived log
    archived log thread=1 sequence=3
    channel ORA_DISK_1: restoring archived log
    archived log thread=1 sequence=4
    channel ORA_DISK_1: restoring archived log
    archived log thread=1 sequence=5
    channel ORA_DISK_1: restoring archived log
    archived log thread=1 sequence=6
    channel ORA_DISK_1: restoring archived log
    archived log thread=1 sequence=7
    channel ORA_DISK_1: restoring archived log
    archived log thread=1 sequence=8
    channel ORA_DISK_1: reading from backup piece /u01/app/oracle/fast_recovery_area/ORCL/backupset/2018_06_25/o1_mf_annnn_TAG20180625T174228_fm1g84xw_.bkp
    channel ORA_DISK_1: piece handle=/u01/app/oracle/fast_recovery_area/ORCL/backupset/2018_06_25/o1_mf_annnn_TAG20180625T174228_fm1g84xw_.bkp tag=TAG20180625T174228
    channel ORA_DISK_1: restored backup piece 1
    channel ORA_DISK_1: restore complete, elapsed time: 00:00:01
    Finished restore at 26-JUN-18
    
    

    备库准备接收Redo log

    SQL> alter database drop standby logfile group 4;
    
    Database altered.
    
    SQL>  alter database drop standby logfile group 5;
    
    Database altered.
    
    SQL>  alter database drop standby logfile group 6;
    
    Database altered.
    
    SQL>  alter database drop standby logfile group 7;
    
    Database altered.

    SQL> select member from v$logfile;

    
    

    MEMBER
    --------------------------------------------------------------------------------
    /u01/app/oracle/oradata/orclstdby/redo03.log
    /u01/app/oracle/oradata/orclstdby/redo02.log
    /u01/app/oracle/oradata/orclstdby/redo01.log

    SQL> alter database add standby logfile
    2 group 4 ('/u01/app/oracle/oradata/orclstdby/orclstdby_redo04.log') size 50m,
    3 group 5 ('/u01/app/oracle/oradata/orclstdby/orclstdby_redo05.log') size 50m,
    4 group 6 ('/u01/app/oracle/oradata/orclstdby/orclstdby_redo06.log') size 50m,
    5 group 7 ('/u01/app/oracle/oradata/orclstdby/orclstdby_redo07.log') size 50m;

    Database altered.

    SQL> select member from v$logfile;

    MEMBER
    --------------------------------------------------------------------------------
    /u01/app/oracle/oradata/orclstdby/redo03.log
    /u01/app/oracle/oradata/orclstdby/redo02.log
    /u01/app/oracle/oradata/orclstdby/redo01.log
    /u01/app/oracle/oradata/orclstdby/orclstdby_redo04.log
    /u01/app/oracle/oradata/orclstdby/orclstdby_redo05.log
    /u01/app/oracle/oradata/orclstdby/orclstdby_redo06.log
    /u01/app/oracle/oradata/orclstdby/orclstdby_redo07.log

    检查主备库监听状态

    打开主库

    SQL> select open_mode from v$database;
    
    OPEN_MODE
    --------------------
    MOUNTED
    
    SQL> alter database open;
    
    Database altered.
    View Code

    打开备库并应用redo

    SQL> select open_mode from v$database;
    
    OPEN_MODE
    --------------------
    MOUNTED
    
    SQL> alter database open;
    
    Database altered.
    
    SQL> alter database recover managed standby database using current logfile disconnect from session;
    
    Database altered.

    检查后有错误,参数文件可能需要修改后面继续。

    Dataguard运行状态检查:

    检查生产端:
    SQL> select database_role from v$database;
    DATABASE_ROLE
    ----------------
    PRIMARY
    SQL> select max(sequence#) from v$archived_log;
    MAX(SEQUENCE#)
    --------------
                18
    SQL> select dest_name,status,error from v$archive_dest where dest_id=1 or dest_id=2;
    DEST_NAME                      STATUS    ERROR
    ------------------------------ --------- ----------------------------------------------------------------------------------------------------
    LOG_ARCHIVE_DEST_1             VALID
    LOG_ARCHIVE_DEST_2             ERROR     ORA-16191: Primary log shipping client not logged on standby
    SQL> show parameter log_archive_dest_2
    NAME                                 TYPE        VALUE
    ------------------------------------ ----------- ------------------------------
    log_archive_dest_2                   string      SERVICE=standby arch ASYNC VAL
                                                     ID_FOR=(ONLINE_LOGFILES,PRIMAR
                                                     Y_ROLE) DB_UNIQUE_NAME=orcl
                                                     
    SQL> show parameter log_archive_dest_state_2
    NAME                                 TYPE        VALUE
    ------------------------------------ ----------- ------------------------------
    log_archive_dest_state_2             string      ENABLE
    SQL> show parameter remote_login_passwordfile
    NAME                                 TYPE        VALUE
    ------------------------------------ ----------- ------------------------------
    remote_login_passwordfile            string      EXCLUSIVE
    经查,参数配置均没问题
    检查DG端;
    SQL> select database_role from v$database;
    DATABASE_ROLE
    ----------------
    PHYSICAL STANDBY
    SQL> select max(sequence#) from v$archived_log;
    MAX(SEQUENCE#)
    --------------
                13
    
    主库进程检查,应有lns进程:

    SQL> select process from v$managed_standby;

    
    

    PROCESS
    ---------
    ARCH
    ARCH
    ARCH
    ARCH
    LNS


    备库进程检查: SQL
    > select process,pid,status from v$managed_standby; PROCESS PID STATUS --------- ---------- ------------ ARCH 2400 CONNECTED ARCH 2402 CONNECTED ARCH 2404 CONNECTED ARCH 2406 CONNECTED 未发现RFS进程 查alert日志 [oracle@primary trace]$ tail -f alert_orcl.log |more returning error ORA-16191 ------------------------------------------------------------ Wed Aug 05 16:43:54 2015 Error 1017 received logging on to the standby ------------------------------------------------------------ Check that the primary and standby are using a password file and remote_login_passwordfile is set to SHARED or EXCLUSIVE, and that the SYS password is same in the password files. returning error ORA-16191 ------------------------------------------------------------ remote_login_passwordfile参数配置,经查没问题 问题估计在密码文件这块,当初搭建DG时,在主备两端通过 orapwd file=orapworcl password=oracle 生成 现将DG端密码文件删掉,从生产端scp密码文件到DG端,问题解决 [oracle@standby dbs]$ rm -rf orapworcl [oracle@primary dbs]$ scp orapworcl oracle@192.168.186.88:/u01/app/base/product/11.2.0/db_1/dbs/ oracle@192.168.186.88's password: orapworcl 100% 1536 1.5KB/s 00:00 验证生产端: SQL> select database_role from v$database; DATABASE_ROLE ---------------- PRIMARY SQL> alter system set log_archive_dest_state_2 = DEFER scope=both; System altered. SQL> alter system set log_archive_dest_state_2 = ENABLE scope=both; System altered. SQL> select max(sequence#) from v$archived_log; MAX(SEQUENCE#) -------------- 20 SQL> select dest_name,status,error from v$archive_dest where dest_id=1 or dest_id=2; DEST_NAME STATUS ERROR ------------------------------ --------- ---------------------------------------------------------------------------------------------------- LOG_ARCHIVE_DEST_1 VALID LOG_ARCHIVE_DEST_2 VALID 验证DG端: SQL> select database_role from v$database; DATABASE_ROLE ---------------- PHYSICAL STANDBY SQL> select max(sequence#) from v$archived_log; MAX(SEQUENCE#) -------------- 20 SQL> select process,pid,status from v$managed_standby; PROCESS PID STATUS --------- ---------- ------------ ARCH 2400 CONNECTED ARCH 2402 CONNECTED ARCH 2404 CONNECTED ARCH 2406 CONNECTED RFS 2611 IDLE RFS 2613 IDLE RFS 2615 IDLE 7 rows selected. RFS进程正常,归档日志已经同步

     如果进程有问题:

    不存在的话,查看oracle alert.log日志,查看日志是否报错。如果日志没有报错,执行如下脚本
    
    在主库和备库均执行
    
    alter system set LOG_ARCHIVE_DEST_STATE_1=ENABLE;
    alter system set LOG_ARCHIVE_DEST_STATE_2=ENABLE;
    
    作者:若有所思11
    链接:https://www.jianshu.com/p/c96b73f8df80
    來源:简书
    简书著作权归作者所有,任何形式的转载都请联系作者获得授权并注明出处。
    View Code

    从我这边实际情况看,把复制过来的orapworcl复制一个备库的实例名的密码文件,故障排除。

    cp /u01/app/oracle/product/11.2.0/db_1/dbs/orapworcl /u01/app/oracle/product/11.2.0/db_1/dbs/orapworclstdby

    校验命令:

    SELECT STATUS, GAP_STATUS FROM V$ARCHIVE_DEST_STATUS WHERE DEST_ID = 2;

    角色切换

    Data Guard provides the V$DATAGUARD_STATS view that can be used to evaluate each standby database in terms of the currency of the data in the standby database, and the time it will take to perform a role transition if all available redo data is applied to the standby database. For example:

    SQL> COLUMN NAME FORMAT A24
    SQL> COLUMN VALUE FORMAT A16     
    SQL> COLUMN DATUM_TIME FORMAT A24
    SQL> SELECT NAME, VALUE, DATUM_TIME FROM V$DATAGUARD_STATS;
     
    NAME                     VALUE            DATUM_TIME
    ------------------------ ---------------- ------------------------
    transport lag            +00 00:00:00     06/18/2009 12:22:06
    apply lag                +00 00:00:00     06/18/2009 12:22:06
    apply finish time        +00 00:00:00.000
    estimated startup time   9

    This query output shows that the standby database has received and applied all redo generated by the primary database. These statistics were computed using data received from the primary database as of 12:22.06 on 06/18/09.

    If a standby database currently running in maximum protection mode will be involved in the failover, first place it in maximum performance mode by issuing the following statement on the standby database:

    SQL> ALTER DATABASE SET STANDBY DATABASE TO MAXIMIZE PERFORMANCE;

    Query the SWITCHOVER_STATUS column of the V$DATABASE view on the primary database.For example:

    SQL> SELECT SWITCHOVER_STATUS FROM V$DATABASE;
    
    SWITCHOVER_STATUS 
     ----------------- 
     TO STANDBY 
     1 row selected 

    Issue the following SQL statement on the target physical standby database:

    SQL> ALTER DATABASE COMMIT TO SWITCHOVER TO PRIMARY WITH SESSION SHUTDOWN;

    Open the new primary database.

    SQL> ALTER DATABASE OPEN;

    Start Redo Apply on the new physical standby database.

    SQL> ALTER DATABASE RECOVER MANAGED STANDBY DATABASE USING CURRENT LOGFILE  DISCONNECT FROM SESSION;

    Restart Redo Apply if it has stopped at any of the other physical standby databases in your Data Guard configuration.

    SQL> ALTER DATABASE RECOVER MANAGED STANDBY DATABASE USING CURRENT LOGFILE DISCONNECT FROM SESSION;

    故障处理一

     ORA-02253:an incompatible media recovery is active

    天在standby 数据库上执行
    
    alter database  recover managed standby database using current logfile disconnect from session; 
    
    报如下错误:
    
    ERROR at line 1:
    ORA-01153: an incompatible media recovery is active
    
    从字面意思理解应该是“存在一个不兼容的介质恢复”。
    
    仔细检查发现上面已经执行过一次
    
    alter database  recover managed standby database disconnect from session; 
    
    猜想应该是重复启用日志应用所致。故取消应用
    
    alter database recover managed standby database cancel;
    
    重新开启应用
    
    alter database  recover managed standby database using current logfile disconnect from session; 
    
    问题解决,没有报错。
    View Code

    参考

    https://docs.oracle.com/cd/E11882_01/server.112/e41134/toc.htm

     

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  • 原文地址:https://www.cnblogs.com/ld1977/p/9175374.html
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