Multiple Instances and schemas to One

Hi,
Good Morning to all gurus.
Using Oracle Version 11.2.0.2
We have a database With 4 instances and Each Instance will be having 10 to 15 schemas Based on Countries. Here in all schemas we will be having Huge data's (count may be 3 to 5 crores for some 10 tables)
Now am keen to Know If i change the above to a single instance and Single Schema(Common for all countries) What Pros and cons Will be there (Technical).
Any Links or Answers are highly appreciated.
HOPE GURUS Here can help me study and understand the above scenarios.
Regards,
Simma....

http://asktom.oracle.com/pls/asktom/f?p=100:11:0::::P11_QUESTION_ID:2246908001297
cons:
o harder to manage
o harder to upgrade
o harder to patch
o harder to maintain
o causes your shared pool size to increase 1,000 times (shared sql goes down the tubes)
o takes more space
o queries against the dictionary will be impacted
o latching on the shared pool goes WAY up (latching = locks = serialization device =
slows you down)
pros:
o none that I can think of.
https://forums.oracle.com/thread/1032030
Seperate schemas have advantages with security, privacy, seperation of duties, and change control. Seperate schemas also have the advantage of logical granularity / grouping for easier management, upgrade, decommission, scalability, hardware or software migration.
Yes, you can develop applications faster if you don't have to think about security, scalability etc, but it will come back to haunt you later.
RobertGeier
AND
Separate schemas have the disadvantage of requiring additonal grants and privileges to support the reference of non-owned objects used in stored code and to support FK definitions across tables owned by different users.
Naming standards and system codes can be used to identify and segregate objects defined under one schema.
The use of solid naming standards with a well chosen group of owners (schemas) would likely be a good compromise. The choice really depends on how large the applicaiton is going to be object wise and how integrated the objects are going to be. The more integration the less separate owners is beneficial.
IMHO -- Mark D Powell --

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and then associate them with apache config..
http://tinyurl.com/yzjpsl
But the instances are all started but I have two problems.
1. I cant find the CF administrator for all the sites
2. I can go to each instance administrator page but not the
main one and also apache does not resolve the VHosts.
Thus if I type in the full domain for one of the instance
sites then I get the page not found..
SO assume my problem is with apache config since the instance
sites are started and I can access them on the LAN.
This is my changes I made to the config of apache..
# JRun Settings
LoadModule jrun_module
"C:/JRun4/lib/wsconfig/1/mod_jrun22.so"
<IfModule mod_jrun22.c>
JRunConfig Verbose false
JRunConfig Apialloc false
JRunConfig Ssl false
JRunConfig Ignoresuffixmap false
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"C:/JRun4/lib/wsconfig/1/jrunserver.store"
#JRunConfig Bootstrap 127.0.0.1:51020
#JRunConfig Errorurl <optionally redirect to this URL on
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#JRunConfig ProxyRetryInterval 600
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.cfswf
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ServerAdmin [email protected]
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<IfModule mod_jrun22.c>
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