Conceptual Question-Standby Database

Hi all,
I was just going through this documentation
http://download.oracle.com/docs/cd/B19306_01/server.102/b14239/log_apply.htm
In the beginning it says
"Log apply services automatically apply redo to standby databases to maintain synchronization with the primary database and allow transactionally consistent access to the data"
I want to know How does process takes redo log and apply to datafile?What is basically happening inside?
Cheers,
Neerav

Dear Neerav999,
If i would know your Oracle database version, i could give you a more detailed explanation but i will give it anyway;
There are options that you can use for the Oracle Data Guard. Data Guard is used for replicating the primary database to the standby database via the archivelogs and/or with the redologs. You may not have a standby redolog for maximized performance protection level and it is not mandatory however you need to have standby redos for maximized availiability and protection, protection levels of the Oracle database.
Starting from 11g, you can able to cancel the recovery process on standby site and open the standby database read only than (magic goes here) you can start the media recovery! The command list as follow for 11g;
ALTER DATABASE RECOVER MANAGED STANDBY DATABASE CANCEL --> This command will cancel the MRP0 process and will stop the continuous media recovery
ALTER DATABASE OPEN READ ONLY
ALTER DATABASE RECOVER MANAGED STANDBY DATABASE [USING CURRENT LOG FILE] DISCONNECT FROM SESSION;
--> Above command will start the media recovery process ON THE READ ONLY DATABASE!You can give it a try that one by creating a dummy table on primary and wait for one or two log switches and check back the standby database. You are going to see the table has been also created there.
So answer to your eternal question! :)
MRP process is there to fetch and request the archivelogs from the primary site. This process can be started with the below command;
ALTER DATABASE RECOVER MANAGED STANDBY DATABASE DISCONNECT FROM SESSION;You may have a simple test of cource. Cancel the MRP process and switch some logfiles on primary site. Than rerun above command to restart the MRP process and check v$dataguard_status fixed view. You will see that MRP is going to try to fetch the missing archivelog files and will try to close down the gap between the primary and the standby database. Here let me show you another 11g feature of Data Guard.
On 11g you can compress the redologs! What do you need to compress it? There is maybe the most threatning problem of the Data Guard is the connection itself. It should be fast and reliable. Otherwise the MRP process will fall behind and if you are running on maximum performance mode, it will also decrease the performance of the primary database and will hardly close the gap. You 11g Data Guard does is it compresses the log files in the fetching period. If its done with fetching and closed the gap than the normal transmission without the compression will continue to operate. Here is an example of redo compression parameter;
alter system set log_archive_dest_n = 'service= ORCLSTBY
LGWR ASYNC valid_for=(ONLINE_LOGFILES,PRIMARY_ROLE)
db_unique_name=ORCLSTBY compression=enable'I have checked the link that you have given and its Oracle 10g but i have just written it to understand some real factors between the 10g Data Guard and the 11g Data Guard. There are also other changes but if you can go to the 11g New Features site you will see Arup Nanda's posts about it.
If you are to use the standby redologs and it is called "Real Time Apply" and you can see it on v$dataguard_status fixed view. Here is the information from the online documentation;
6.2.1 Using Real-Time Apply to Apply Redo Data Immediately
If the real-time apply feature is enabled, log apply services can apply redo data as it is received, without waiting for the current standby redo log file to be archived. This results in faster switchover and failover times because the standby redo log files have been applied already to the standby database by the time the failover or switchover begins.
Use the ALTER DATABASE statement to enable the real-time apply feature, as follows:
    *For physical standby databases, issue the ALTER DATABASE RECOVER MANAGED STANDBY DATABASE USING CURRENT LOGFILE statement.
    *For logical standby databases, issue the ALTER DATABASE START LOGICAL STANDBY APPLY IMMEDIATE statement.
Standby redo log files are required to use real-time apply.Here is a fixed view that you may see the processes;
http://download.oracle.com/docs/cd/B19306_01/server.102/b14237/dynviews_1169.htm#REFRN30144
PROCESS      VARCHAR2(9)      Type of process whose information is being reported:
    *RFS - Remote file server
    *MRP0 - Detached recovery server process
    *MR(fg) - Foreground recovery session
    *ARCH - Archiver process
    *FGRD
    *LGWR
    *RFS(FAL)
    *RFS(NEXP)
    *LNS network server processAll above indications are most verbose and your answer to your question resides here but you need to read it carefully to understand how Oracle applies log files.
http://download.oracle.com/docs/cd/B19306_01/server.102/b14239/manage_ps.htm#i1009613
Regards.
Ogan

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    971424 wrote:
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