Synchronise Oracle Tables to SQL Server
You can synchronize Oracle and SQL Server in many ways. For example:

You can use sql server transactional replication with Oracle as a publisher:
https://msdn.microsoft.com/en-us/library/ms152481.aspx

You can use Oracle GOldengate (very expensive):
http://www.oracle.com/technetwork/articles/datawarehouse/oracle-sqlserver-goldengate-460262.html

regards
Giova