Re: Real time data trasfer between 2 DB

your over all design should be based on vougae accounting  and not on normal
business accounting method.
from your mail/description it looks like database server will be in the
transport bus..instead going for a flat file will be good option I suppsoe,
tools like SSIS, oracle discoverer are better options for datacleansing,
loading and such other work

thanks..subodh

On 27 August 2010 19:03, Upendra N <nupendra@xxxxxxxxxxx> wrote:

> Are you suggesting 10K GPS units will be sending inserts every 5 seconds to
> the database?
> 60 seconds = 12 * 10K = 120K records? Since they are individual units I
> assume the transactions will be committed for every record -120K
> transactions/sec.
> You'll have lots of opportunities to tune your production database.. :) You
> may want to look into using SSDs for redologs.
>
> Is the data purged from these tables periodically? If so, that will define
> your replication strategy, because any deletes you'd run on these tables
> will also have to be replicated across in addition to the normal replication
> traffic. You could also consider creating partitioned table with daily
> partitions so you can drop them after certain time.
>
> With this many records/transactions any trigger based replication will be a
> nightmare to manage. You may want to look into Active Dataguard from 10g to
> 11g (as Andrew suggested), Streams or logical standby database.
>
> Near real-time replication requirements with this volume of data will be
> too difficult to handle if there was a network glitch, you'll have difficult
> time recovering from a 2-3 hour network outage. You really need to think if
> it is even worth setting up the second database as supposed to dedicate a
> RAC node in production for reporting/read only operations.
>
> -Upendra
>
>
>
> ------------------------------
> Subject: RE: Real time data trasfer between 2 DB
> Date: Fri, 27 Aug 2010 09:59:19 +0200
>
> From: Arvind.Kumar@xxxxxxxxxxxxx
> To: nupendra@xxxxxxxxxxx; oracle-l@xxxxxxxxxxxxx
>
>
>  Hi Upendra,
>
>
>
> Thanks for the suggestions.
>
>
>
>    - There will be three tables for initial load with 2.7GB in total.
>    - Destination table only be used for reporting so not updates.
>    - There would  be 10000GPS units which will send their coordinates and
>    other information
>
>  At every 5 second so (10000) records would need to be transferred
> destination database with every refresh.
>
>    - We are using varchar2 and number in those tables.
>
>
>
> Thanks
>
> Arvind Kumar
>
>
>  ------------------------------
>
> *From:* Upendra N [mailto:nupendra@xxxxxxxxxxx]
> *Sent:* Friday, August 27, 2010 7:51 AM
> *To:* Arvind Kumar (IT-SIS-UIF); oracle-l@xxxxxxxxxxxxx
> *Subject:* RE: Real time data trasfer between 2 DB
>
>
>
> Hi Arvind,
> Depends on the flexibility on "near real time" requirements, you could use
> the following:
>
> 1. Materialized views - You could setup MVs with fast refresh to every
> minute or 30 seconds refresh interval. Depending on your read-only or read
> write requirements on the tables, this may or may not work. This is easy to
> setup and easy to manage.
> 2. Active Data guard - If you want only a read only database at the other
> site, this will work.
> 3. Advanced replication - You could setup replication interval to 30-60
> seconds. Provides flexibility to use tables that can be updated at both the
> databases.
> 4. Oracle Streams - You could setup schema level or selective table level
> replication, replication interval could be 30-60 seconds.
> 5. Depending on the flexibility you could also consider Oracle RAC - Metro
> cluster where RAC nodes spread across multiple data centers.
>
> Near real time could be 5 milliseconds or 5 minutes... you need to define
> this.
>
> Some of the questions you need to clarify:
> How large are the initial size of the tables?
> Do you want update capabilities on the destination database?
> How much data will you generate between the refresh interval?
> Do you have any special data types that needs to be replicated?
>
> -Upendra
>
>
>  ------------------------------
>
> Subject: Real time data trasfer between 2 DB
> Date: Fri, 27 Aug 2010 07:21:59 +0200
> From: Arvind.Kumar@xxxxxxxxxxxxx
> To: oracle-l@xxxxxxxxxxxxx
>
> Greeting all,
>
>
>
> What would be the best method to transfer data between two databases (10g
> R2) in real time (near real time). It’s a transport system where GPS devices
> installed in City Buses inserts records (location, timings) into oracle DB
> then this data has to be transferred to other oracle DB for reporting with a
> max latency on 5 second.
>
> Any input or experience on similar scenario will be highly appreciated.
>
>
>
> Thanks
>
> Arvind Kumar
>
>
>



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