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  • We have moved to kindly check http://onlineAppsDBA.comin future
    Configure Oracle Dataguard
    Tuesday, November 28, 2006
    Register for R12 upgrade
    Yesterday we looked at Data Guard overview in Oracle Database , Today I am going to cover step by step configuration for Oracle Dataguard & may be in next or future posts I will discuss on common mistakes which you can do while configure dataguard / standby database.

    Below steps are based on assumptions that Primary Database is on & Standby database is on . Database Instance Name is PROD and database listener is listening on port 1525. Mount point on primary & standby database are same (If they are not you need to set parameter db_file_convert)

    I am assuming using LGWR, ASYNC option with log shipping service which means ,
    LGWR (Log Writer process will be used to write to standby site instead of ARC archiver process)
    ASYNC (Redo logs to standby is asynchronous to primary site)

    You may have to change options with log shipping service (LOG_ARCHIVE_DEST_n) depending on data protection mode you wish to choose. (I am using Maximum Performance Mode - Default Mode)

    Enable Archive log
    For standby database configuration your primary database should be running in achieve log mode. In order to convert your primary database into archive log mode follow these steps


    SQL> alter system set LOG_ARCHIVE_DEST_1 ='LOCATION=/u01/oracle/data/arch' scope=spfile; (I am assuming that you are using spfile here , if you are using pfile skip scope=spfile)

    SQL> alter system set LOG_ARCHIVE_DEST_2 =' LGWR ASYNC REOPEN=60' scope=spfile; (We will create above TNS Alias in next step)
    SQL> alter system log_archive_dest_2='DEFER' (Defer this until you have standby system Up)

    SQL> shutdown immediate
    SQL> startup

    You should see archive logs generated after this on standby site

    Enable Force Logging
    You should enable Force logging in primary database else if some transaction which doesn't generate redo log can corrupt your standby database. (Careful in OLTP transactions or long running requests in Apps)

    Set Initialization Parameter
    SQL> alter system set fal_client = ’’ scope=both;
    SQL> alter system set fal_server = ’PROD_remote1.domainname’ scope=both;
    (Here FAL, Fetch Archive Log is used to fetch archives in case gap in archives arises because of any reason)

    SQL> alter system set STANDBY_FILE_MANAGEMENT=AUTO scope=both; (This is used to automatically generate file in standby site like if you add a datafile, this will create one in standby site as well)

    Create Standby Control file & copy datafile including oracle_home
    Create standby control file as
    SQL> alter DATABASE CREATE STANDBY CONTROLFILE AS '/u01/oracle/home/standby.ctl'

    You can installed New Database on standby site or Use ORACLE_HOME software from primary site on standby site.
    Copy datafiles, redologs, initializations file, tnsnames.ora, listener.ora & control file from primary site to standby site.

    Other steps & few important things w.r.t. dataguard coming in Next Post...

    Labels: ,

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    posted by Atul Kumar @ 8:18 PM  
    • At 11:12 PM, Anonymous Kevin Closson said…

      Thanks for this DG post. I do have a question, however. How do you use a copied OH on the standby node? Oracle Home has so many embedded hostname occurances throughout... are you speaking of an OH clone ?

    • At 7:26 AM, Blogger Atul Kumar said…

      I agree that there will be some hostname entries in oracle_home like for db console & that will not work but you can overcome that by using primary database hostname as virtual host name in standby like lets in ex. above primary hostname was , then in standby host /etc/hosts we can use
      IP_of_standby hostname2 hostname1

      Now be careful when you use above solution, your tnsnames.ora should use IP address in standby site instead of hostname

      You can avoid these issues by doing a fresh Install on standby site as well.


    • At 4:39 AM, Anonymous Anonymous said…


      Another Option you have is to clone the Oracle Home.

      you have option in runInstaller -clone

      you can go through runInstaller help on this.

      Oracle Corp.

    • At 4:40 AM, Anonymous Anonymous said…

      Atul, Excellent urs is the best Blog spot i have ever seen.

      Kevin, You can go for Oracle Clone option coming along with runinstaller -clone.

      Oracle Corp.

    • At 7:56 AM, Blogger Atul Kumar said…

      Thanks a lot for your comments. Thanks for sharing clone option in Installer with everyone .

      Everyday is new learning & I would like to explore clone option in my next configuration :)


    • At 5:46 PM, Anonymous Anonymous said…


      Thanks for the informative guide so far! Was wondering when you were going to complete it and my main question was that is there a way you can automae monitoring of what logs have been applied to the standby database (on Windows). Hence once applied delete the log?

      Thanks in advance

    • At 8:08 PM, Blogger Atul Kumar said…

      Hi Anonymous,
      I missed it completely that I have to finish it . Try to cover in a week or two

    • At 12:40 PM, Anonymous Anonymous said…


      when you are going to update the remaing steps?and also it will be helpful if you exlpain more in configuring the DG on the same host.


    • At 2:51 PM, Anonymous Anonymous said…

      Hi, Atul,

      Can I have two different types of standby databases, like one physical and one logical standby database?

      I recently build one physical standby, it works well after some workaround. But new requirements is coming, a logical standby in need. Do you have the doc to implement the system?



    • At 3:09 PM, Blogger Atul Kumar said…

      Check at

    • At 7:24 PM, Anonymous irfanerp said…

      Logical Standby is not supported with oracle apps ebusiness suite 11i


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