Replication question

Hi,
 I have three identical databases say A, B and C. I want to replicate from A 
and B to C. Meaning C will have its own data plus the data from A and B. I 
can not create a db link from A or B pointing to C for security reasons. 
Also handing over the stream_admin password of C to A and B to push their 
changes through streams is not very good idea. I can not have multimaster 
replication as C is not sending its change to A or B. 
 Please suggest how this can be done? Is any one using streams to capture 
data from remote database to your data center? Seems like streams push 
technology is a security hole.
 Thanks
 Sandeep

Other related posts: