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Home -> Community -> Mailing Lists -> Oracle-L -> Re: Standby/Replicated database for reporting functionality
Mark,
I searched in vain for the information on whether or not Adv Repl is in Standard Edition. We have all Enterprise Editions, so we had it; but you want to search more in Oracle website or inquire with your (friendly?) neighorhood Oracle Sales Rep to ascertain that.
I will address the responses of Ade in this mail too. The usage of MVs in reporting instance will make the process simpler, but in your case, you mentioned the app creates the tables on the fly. Using a snapshot replication environment will not be possible in that case. The trick is to use MM replication and use the dbms_repcat to create these tables in separate nodes automatically via a DDL trigger on the database. The only thing you have to be aware of is the need to quiesce the master, i.e. to stop all transactions for a brief time when the operation is performed on the master table. Use the script provided by Ade, except change copy_rows=>FALSE to copy_rows=>TRUE and eliminate the offline instantiation part; it's not necessary and not possible in your case.
> In relation to our DDL issue with replication i.e. creating database
objects
> via the overlying application, could we simply create the objects in
> question manually in the reporting node or does the DBMS_REPCAT package
need
I was under the impression that the table creation process was controlled by the app and you had no control over it. No, you do NOT have to create the objects on the reporting node manually; dbms_repcat will do that automatically, and that is why you would automate that ussing DDL trigger. However, if you can use a manual approach for creating tables, you could use snapshot replication. The steps involved are a bit complicated, but they can be proceduralized.
HTH.
Arup Nanda
www.proligence.com
> Hi Mark,
>
> I'm pretty sure advanced replication is not supported by the standard
> edition. However if you are just doing reporting I'd say adv. rep. is
> overkill. Have you looked into the use of snapshots ?
>
> Regarding the DDL question, you can create objects manually and then
> integrate them into the replication framework, see below...
>
> execute
>
dbms_repcat.create_master_repobject(gname=>'REP_GROUP',type=>'TABLE',oname=>
>
'YOUR_TABLE',sname=>'YOUR_SCHEMA',copy_rows=>FALSE,use_existing_object=>TRUE
> );
>
> Then do offline instantiation (see Metalink for this, looks more complex
> than it really is). Or you can use execute
> dbms_repcat.create_master_repobject to create the target objects for you
and
> shift the data across, however you have to do this during out of hours
> otherwise your source/target will get out of sync due to DML changes.
>
> Ade
>
> -----Original Message-----
> Sent: 07 May 2003 13:42
> To: Multiple recipients of list ORACLE-L
>
>
> Thank you Arup for your information. No decision made yet.
>
> You mentioned that using multi-master replication you can use different
> Oracle versions on the "reporting" node. Does this include Editions too
i.e.
> Enterprise Edition versus Standard Edition? Using the Standard Edition
will
> obviously reduce our licensing costs considerably but this is not an
option
> if we use a Standby Database as Standby Databases are not supported by the
> Standard Edition.
>
> In relation to our DDL issue with replication i.e. creating database
objects
> via the overlying application, could we simply create the objects in
> question manually in the reporting node or does the DBMS_REPCAT package
need
> to be used to notify the replication layer that all DML on this table in
the
> primary node must be replicated. As tables are created through a
controlled
> process this would simply be an additional step to the process and should
be
> easy to manage.
>
> Looking forward to your reply!
>
> By the way, the overlying application we're using is JDEdwards OneWorld.
> Does anybody know if this can be integrated with Oracle's DBMS_REPCAT
> package when generating DDL and creating tables/indexes etc.
>
> Thanks,
> Mark.
>
>
>
> -----Original Message-----
> From: "Arup Nanda" <orarup_at_hotmail.com>
> Date: Tue, 6 May 2003 08:49:48 -0400
> Subject: Re: Standby/Replicated database for reporting functionality
>
> Sorry, I saw this late. You might have already decided on an option. If
so,
> please disregard this message. To create the standby database, you don't
> have to use RMAN. However, standby database may not answer your
> requirements. You are looking for a read only copy of master database for
> reporting in as real time as possible. In a managed recovery enabled
standby
> database, you must stop the recovery and open the database in read only
mode
> for reporting. For the entire period of reporting, the standby remains out
> of sync with the production database, which may not be acceptable to you.
> Besides, if you want to create additional indexes and tables to facilitate
> the reporting, it's not possible in standby database.
>
> I feel the best bet is to use a multi-master replication solution where
you
> will use only one node for production, leaving the other node to
reporting.
> While the application creates the tables, etc., you could create some
> database triggers to capture the events and call appripriate replication
> packages to propagate the changes to the other node, transparent to the
> application. This will make it as real time as possible. Besides, you will
> be able to create additionals indexes, summary tables, etc. in the
reporting
> database; you could even run a different Oracle version on that node.
Since
> you use only one node for production changes you will not need
sophisticated
> conflict resolution routines.
>
> The best option is of course, 9i logical standby database; but I see that
> you don't have 9i, yet. In the same boat as I am in, for some of my canned
> applications here.
>
> HTH.
>
> Arup Nanda
>
> > Folks,
> >
> > many thanks for your comments, tips and pointers.
> > Logical standby databases in 9i sound ideal (if stable) but we do not
> intend
> > to upgrade to 9i for some time. Creating a standby via RMAN is totally
new
> > to me a sounds interesting too, guess this is a 9i feature? Will look
> > further into this also.
> >
> > Thanks all again.
> > Mark.
> >
> >
> > > -----Original Message-----
> > > From: Patterson, Mark
> > > Sent: 02 May 2003 12:34
> > > To: 'ORACLE-L_at_fatcity.com'
> > > Subject: Standby/Replicated database for reporting functionality
> > >
> > > Hello All,
> > >
> > > I am looking into options for creating a copy of a production database
> > > (Oracle 8.1.7 Enterprise Edition, Windows 2000) for reporting/querying
> > > purposes. The database should be hosted on a separate server and the
> data
> > > needs to be as real-time as possible.
> > >
> > > The options I've looked into are database replication and a standby
> > > database. Custom development of triggers, database links etc is
> > > unfortunately not an option.
> > >
> > > I've ruled out database replication as the overlying application must
> > > create tables via its own management interface and this cannot be
> > > integrated with Replication Manager or DBMS_REPCAT.
> > >
> > > This leaves me with the standby database option where the database can
> be
> > > in read-only mode throughout the day and managed recovery though the
> > > night.
> > >
> > > Does anybody know if there are other options available to create a
such
> > > reporting read-only database or similar. (Read-only is not mandatory
but
> > > is acceptable as updates to this database are not envisaged)
> > >
> > > Are there licensing implications when using a standby database? The
> > > production "master" database is licensed under the processor licensing
> > > model but the intention is to simply purchase a named user license for
> the
> > > standby "reporting" database as there will be a very limited number of
> > > users using this database.
> > > Does anybody know if this is possible/approved by Oracle?
> > >
> > > In a nutshell, I am looking to create a real-time copy of my
production
> > > database as cheaply as possible for reporting purposes only.
> > >
> > > If anybody has answers to the above or experience of other methods of
> > > replicating a database it would be great to hear from you.
> > >
> > > Thanks,
> > > Mark.
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> Please see the official ORACLE-L FAQ: http://www.orafaq.net
> --
> Author: Patterson, Mark
> INET: Mark.Patterson_at_organon.ie
>
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-- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Arup Nanda INET: orarup_at_hotmail.com Fat City Network Services -- 858-538-5051 http://www.fatcity.com San Diego, California -- Mailing list and web hosting services --------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).Received on Wed May 07 2003 - 21:26:39 CDT
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