Best way to Rebuild multi-master replication

I have a site (A) which has been modified (tables and columns and such) that was used as the master replication site.
I have another site (B) which was the target site. The tables in site B have not been changed.
The replication is functioning correctly (as the columns and tables were only additions).
All the replication is asynchronous and is divided into to groups (one that refreshes every 2 minutes and one that refreshes every 15 minutes)
I want to bring site B up to date (move the changes from site A into site B).
I know that the data in the added columns has not been utilized as the new software was not in production yet.
I know I will need to rebuild the replication groups to include the missing columns, and I presume I will need to stop the replication (I will disable the PUSH so I can still work with the master database).
I will also need to add the new tables to the replication groups.
I can rebuild the database entirely using an export and import (after cleaning out the existing database in site B).
The question I have is efficiency, would I be better to just drop all the replication and start from scratch using the export?
Could I simply add the tables and columns to site B and rebuild the replication? Will I run into issues when I try to rebuild the replication if the job remains broken?
Or can I rebuild site B (after breaking the job) using the export, then rebuild all the replication groups and re-enable replication (I know the scn numbers need to align but I am not sure if it will cause issues with the pending replication in the queue once I break the job).
I am pretty much free to do what is needed (even though this is a production environment, the replication is not critical - I just cannot deny access to the master site for the users)
The "former" DBA did not understand replication apparently and I have inherited this mess, while I understand how to do most of the things in this situation, I am not so sure of the best (or fastest) way.
Forgot to mention the environment Oracle 11g R2 running on Linux (Ubuntu 12.04 LTS)
Message was edited by: MrOracle

There was a good discussion on the same subject in one of the oracle forum.
Q] I have an application where data is never deleted, I have just rebuilt an
index which was previously 4gb in size and its now 3gb in size. Can anybody
explain?
A1] The first thing that comes to mind is that (assuming what was taught
on the Oracle Fundementals and tuning course I went on with Oracle
University last year is true[1]) when an index leaf block that is not
the right most block is filled up the next entry to be put in results
in a 50-50 split, two blocks are created one containing the lower 50%
of the entries and the other containing the higher 50%, both half
full.. Assumign that the indexed field isn't an increasing key type
value (i.e. it is possible to insert a value that will be lower
(futher left) than an earlier value) that will mean that your index
leaf blocks will mostly be between 50% and 100% full. Assuming a
reasonably random distribution of data your average block would be
around 75% full (split the difference between 50% and 100%). When you
rebuild the index the blocks are (with the same caveat as above)
repacked to 100% (or upto PCTFREE, I forget which) full. this would
explain why the size of the index has changed to 75% of it's previous
value. The same amount of data, it's just packed more tightly.
I don't have a database to hand to check this but it does seem to fit
the situation and my reccollection of how I'm told Oracle handles
indexes.
Stephen
[1] I'm told, and have seen, that it's not always a given. Maybe
there's a conference paper in somone's future entitled something like
"Lies Oracle Told Me: The gap between training and reality"
A2] If you look at Stephens post, then a reduction from free space of 30% in the blocks to 10% in the blocks (assuming pctfree =3D 10), gives around 20% gain back or around 800m from a 4G index. This would fit in quite nicely with what you are observing.
Jaffar

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Hi,
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1. Delete agreement on machine A and B.
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3. Disable the changelog on machine A and B.
4. Enable the changelog on machine A and B.
5. Enable the replica on machine A and B.
6. Create replication agreement on A and B.
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Data required to update replica "cn=rep1, cn=replica, cn="o=sylantro.com", cn=mapping tree, cn=config (host rosemary.sylantro.com, port 389)" has been purged. The replica must be reinitialized.
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This problem still occurs even if I restart the server before Step 4.
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[07/Feb/2002:10:06:02 -0800] NSMMReplicationPlugin - Unable to aquire replica "cn=rep1, cn=replica, cn="o=s
ylantro.com", cn=mapping tree, cn=config (host wasrocky.sylantro.com, port 389)": the replica has the same Replica ID as this one. Replication is aborting.

The server looks like it is remembering its old replicaID.
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Thanks!
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For the problem #2, the message is correct, because, although you have changed the ReplicaId on both server, your data still contain references to the previous replicaId both on Server A and Server B.
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Please help me with this regard.
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Hello All,
Rich, you have been a support to most of us in the group(indeed much to my help)...Its splendid work....
My problems disappeared after applying the Service pack ....the service pack in fact is mainly to sort out the replication issues.
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Hi all,
 
I am studying Oracle replication and I tried to apply multi master replication MMR between two databases: WinXp12 (master definition) and WinXp11. 
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Hi!
You will need to create a public db link and a private db link connecting to the public link.
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PP

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hi
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I had master 1 with some entries and now i am doing replication with master-2 which doesn't have any entries.
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As Ludovic mentioned, after you load data to the first master server, you have to initialize your second server (either it's master or read-only replica) in two ways:
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Stephen Tsun wrote:
I have a suffix called dc=calient,dc=net. I followed the suggestions in
the
iPlanet install guide and created 2 directory servers
a) suffix o=NetscapeRoot, at some arbitrary port, 4601
b) suffix dc=calient,dc=net, at the usual port 389.
All my searches/create/delete work fine. However, when I try to replicate
with multi-master between 2 machines, I keep getting into problems.I don't understand something: which backend do you want to replicate?
The one holding 'o=NetscapeRoot' or the one holding 'dc=calient,dc=net'?
Do you want to setup replication between these two instances of the
directory server (i.e. between port 4601 and 389 in your example)?
Q1: do people out there really split their tree from the o=NetscapeRoot
tree?If you have multiple directory servers installed in your environment, it
is probably worth dedicating (at least) one directory server for the
o=netscaperoot tree.
Q2: The admin guide says the the unit of replication is a database, and
that each replication can only have 1 suffix. Is this true? Can
a replicated db have more than 1 suffix?Well, it is normal, since in iDS 5.x you have 1 suffix per database.
You can, however, replicate multiple databases.
Q3: If I also want to replicate the o=NetscapeRoot tree, I have to set
up yet 2 more replication agreements. Isn't this more work? If
I just lump the 2 suffixes together, wouldn't it be easier? But would
it work?You can't lump the 2 suffixes together, because each backend has 1
suffix associated with.
Q4: I followed the instructions to enable replicas on the masters.
But then I tried to create this cn=Replication Manager, cn=config
object.
But what is the object class of this entry?Usually, it is organizationalperson or inetorgperson. In most of the
cases you want an objectclass which can have userPassword attribute.
An iPlanet user has uid
as its RDN... I tried a person object class, and I added a password.
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cn=replication manager, cn=config, but 'uid=replication manager,cn=config'
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Manager,
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using
ldapsearch, I can only see cn=SNMP, cn=config.The configuration tree is protected by ACIs, so you can not see them
using anonymous BINDs. Try binding as 'directory manager' and you will
find your entry.
Also, do I have
to give all access via aci to my suffix dc=calient,dc=net?For what purpose? For replication, it is enough to set user DN in the
replication agreement and this user can update the replicated backend.
Q6: when replication fails, should the Dir Server still come up?Yes.
Bertold

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