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Oracle Core: Essential Internals for DBAs and Developers by Jonathan Lewis

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Oracle in Processes

Figure 1-1 shows the simplest process diagram of Oracle you’re likely to see and (probably) the most complicated process diagram of Oracle that you really need to understand. This, basically, is what the book is about; everything else is just the icing on the cake.

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Figure 1-1. The “just enough” diagram of Oracle Database processes

Figure 1-1 shows two types of files. Data files are where our “real” data is kept, and redo log files (often just called log files) are where we record in a continuous stream a list of all the changes we make to the data files.

The data files are subject to random access. To allow random access ...

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