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Extra resources for Oracle Database Administration for Microsoft SQL Server DBAs (Osborne ORACLE Press Series)
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Understanding how the internal and system structures are set up in Oracle will give you insight into some of the best practices for Oracle. In this chapter, we will focus on configurations and how the memory and system areas are organized. There are also Oracle processes or services to get to know. Then we will take a look at some of the knobs that can be turned for options of the database. Finally, we will examine how changes and transactions are handled by the logs and processes. A Memory Structures Databases use memory to cache data blocks for fast access.
The Oracle catalog also contains system information. The catalog is created when a database is created, and it is updated with upgrades and patches. sql scripts run as part of the Oracle installation, and they create the data dictionary. The GRANT SELECT ANY CATALOG to USER role can be granted to a user to allow read access to the catalog views. This role can have three different levels of permissions: USER_ for those objects owned by the user, ALL_ for any objects for which the user has permissions, and DBA_ for any catalog.
Transaction process flow 41 42 Oracle Database Administration for Microsoft SQL Server DBAs checkpoints run, the database writers would join into the process to write the changed database blocks back to the datafiles. Understanding how Oracle handles transactions will help you in sizing the memory, undo tablespaces, and redo logs. Being able to have consistent reads in the database and provide a way to access the data without being blocked or needing to wait for transactions to complete is also key in the performance of queries against the database.