Top 5 Oracle Service Bus fundamental Questions Top 5 Oracle Service Bus fundamental Questions. Q1. What is OSB and why we need OSB? Ans � In simple answer it�s a middleware tool provided by Oracle. It stands for Oracle Service Bus. It is used to delivers low-cost, standards-based integration for mission critical SOA environments where extreme performance and scalability are requirements. It simply transforms any complex architecture to simple by connecting different application and service. Q2. What is Proxy Service? Ans - Proxy service is a service which you can exposed to the outside world. Instead of publishing the actual service to real world we can publish the proxy service with additional / optimized business logic. Proxy service can call any other proxy service (ps), local proxy service (lps) and business service (bs). It often called over http protocol. Q3. What is Business Service? Ans � Business service is nothing but it defines the WSDL. As a standard business service...