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Home -> Community -> Mailing Lists -> Oracle-L -> RE: replication question
Thanks tons Kevin, that is the information I was looking for.
Great, quick response.
-----Original Message-----
I have used both.
Replication, like archive log movement , happens whenever you set it up to
happen. That can be anywhere from every minute to once a day to beyond.
It just depends on your needs. In the case of my old job, we had
replication happening at different times for different tables. Our key
table was replicating IMMEDIATELY upon any changes to the parent table.
This happened via trigger. Other , not so important tables, would
replicate at anywhere from 30 to 60
I see two real nice advantages of replicated databases. One, they are
accessible. i.e. you can run reports, queries, etc on them. They are
nothing more than instances that get updated via a foreign database. Two,
depending on what kind of software you use, you can update the database from
an outside source. We used to have data sent down from our DB2 database
into our Oracle database using an oracle product called Replication Services
Archive log transport for standbys can happen in multiple ways also. The
newer oracle versions support direct archiving from a production database to
a standby database. I have not tried this yet but we are looking into it.
Our current standby databases are brought up to date with a shell script
that is scheduled via cron every 20 minutes.
The thing about the standbys, they are all or nothing ... you can not just
say I want only tables 1-10 to be updated. They all are. Also, in the
older oracle versions, the standbys could not be accessed via software so
you could not use them as any sort of read only database. This is not the
case in a replicated database. But, they are also very easy to rebuild and
resetup. Just copy your production files over, create a standby control
file, and bring the databse up in standby mode. Very easy.
Now... which would I recommend ??? Depends on your needs.
If you really need to access that copy of the database for other purposes
and you only want certain tables to be updated, then I would consider
replication. If, on the other hand, you do not have to access the data
Kevin
Is replication faster than a standby database. As I understand it, the
standby database will be receive arch logs at preset intervals. Does
replication have the same functionality and about how much data is sent to
the replicated site.
From: root_at_fatcity.com [mailto:root_at_fatcity.com]On Behalf Of Kevin Lange
Sent: Monday, March 04, 2002 2:43 PM
To: Multiple recipients of list ORACLE-L
Subject: RE: replication question
minutes. We did this using scheduled jobs.
(nothing more than triggers and a specific data structure) and an IBM
product called Data Propogator.
(until such a time as your production gets killed and you need your standby
up) and you need a fast way to rebuild the second database, I would suggest
the Standby approach.
-----Original Message-----
From: James Ambursley [mailto:james_at_rogers.wave.ca]
Sent: Monday, March 04, 2002 12:24 PM
To: Multiple recipients of list ORACLE-L
Subject: RE: replication question
-----Original Message-----
From: root_at_fatcity.com [mailto:root_at_fatcity.com]On Behalf Of Kevin
Lange
Sent: Monday, March 04, 2002 10:44 AM
To: Multiple recipients of list ORACLE-L
Subject: RE: replication question
The way I see it ..... the question comes down to whether or not you
need two way replication or just one way. If both databases can update
those tables and you need them synced between the databases then Advanced
Replication would be the route. If all you need are data changes from 1
database to be replicated to another database then simple replication is all
you need.
-----Original Message-----
From: Rahul Dandekar [mailto:rvd_oracle_at_hotmail.com]
Sent: Monday, March 04, 2002 6:43 AM
To: Multiple recipients of list ORACLE-L
Subject: Re: replication question
Depends on your need.
You can have read only snapshots, updatable snapshots
or multimaster...
Again if you think of multimaster... then you would need to make
decision
based on your application requirements about sync or async
I donot have any expereince of snapshot replication.
But, if you are planning multimaster replication, then better
spend a couple of months studying it and testing on test boxes...
Make 100% sure that your application really needs the replication
and there is no other simpler option...
Just 2 cents...
+Rahul
----- Original Message -----
From: Bunyamin K. Karadeniz
To: Multiple recipients of list ORACLE-L
Sent: Monday, March 04, 2002 3:33 AM
Subject: replication question
Dear Gurus,
The clients will enter records to a database all day and I will
update the other database .
I need to replicate 10 tables in a database to other database at a
specific time.
Do I need Advanced replication or basic replication . ?
How can I understand that replication is supported in my both
databases. ?
Bunyamin
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