Even a very well tested product have these basic problems when finally put into the production.
This statement is not an exaggeration of truth. It is Truth. There are multiple software components and multiple platforms on which these components are made to run. For example an embedded JVM may process the logoff signal from a remote desktop connection on a Windows server.
The Java Runtime Bug cause the embedded application to crash and dump core on a Windows platform.
Errors like this are hard to debug and fix.
Memory leaks are another complex thing to debug and fix when it happens on a Live/Production environment. It is best to identify the leaks during the development/testing phases. Example of such errors are the ORA-04030 errors showing the out of process memory on an oracle database running a production application.
When applications use the connection pooling and hold the connection for a long duration and application carries out complex and divergent transactions through these connections it gets quite challenging to identify and fix the problems.
Bottom line: The rigor of performance and scalability testing is very crucial in a product development life cycle.
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