Concurrency and Multi-versioning


As stated in the last chapter, one of the key challenges in developing multiuser, database-driven applications is to maximize concurrent access but, at the same time, ensure that each user is able to read and modify the data in a consistent fashion. In this chapter, we’re going to take a detailed look at how Oracle achieves multi-version read consistency and what that means to you, the developer. I will also introduce a new term, write consistency, and use it to describe how Oracle works not only in a read environment with read consistency, but also in a mixed read and write environment.


Current Mode Data Warehouse Update Statement Repeatable Read Concurrent Access 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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© Thomas Kyte 2010

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