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In this chapter, we've examined the principles and practices behind maintaining good levels of concurrency in the database. We've explored the lifecycle of a transaction and introduced the concept of undo data. We've learned how to manage this undo data in an undo tablespace and use database parameters to enable Automatic Undo Management. Finally, we've examined database serialization mechanisms, including locks, latches, and mutexes. In our next chapter, we explore an entirely new subject—the way networking operates in Oracle.