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The Dynamic Performance (V$) Views
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In addition to the data dictionary, Oracle maintains an important set of dynamic performance tables. These tables maintain information about the current instance, and Oracle continuously updates these tables. The set of virtual dynamic tables is referred to as the X$ tables. Oracle doesn t allow you to access the X$ tables directly; rather, Oracle creates views on all these tables and then creates synonyms for these views. You ll be accessing these views, called the V$ views, to get information about various aspects of a running instance. The V$ views are the foundation of all Oracle database performance tuning. If you wish to master the Oracle database, you must master the V$ dynamic views, because they are the wellspring of so much knowledge about the Oracle instance. The dynamic performance views, like the data dictionary views, are based on read-only tables that only Oracle can update. Some of the tables capture sessionwide information, and some of them capture systemwide information. You ll find the dynamic views extremely useful in session management, backup operations, and, most important, performance tuning. Remember, though, that the dynamic performance tables are only populated for the duration of the instance and are cleaned out when you shut down the instance.
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The Three Sets of Data Dictionary Views
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Oracle doesn t allow you to access the internal data dictionary tables directly. It creates views on the base dictionary tables and creates public synonyms for these views so users can access them. There are three sets of data dictionary views USER, ALL, and DBA with each set of views pertaining to a similar item containing similar columns. The views in each category are prefixed by the keywords USER, ALL, or DBA. Each of these sets of views shows only the information the user is granted privileges to access, as follows: USER: The USER views show a user only those objects that the user owns. These views are useful to users, especially developers, for viewing the owner s objects, grants, and so on. ALL: The ALL views show you information about objects for which you have been granted privileges. The views with the prefix ALL include information on the user s objects, and all other objects on which privileges have been granted, directly or through a role. DBA: The DBA views are the most powerful in their range. Users who have been assigned the DBA role can access information about any object or any user in the database. The DBAprefixed dictionary views are the ones you use to monitor and administer the database.
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How Is the Data Dictionary Created
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The data dictionary is created automatically when you create the database. Well, almost automatically, because you do have to run the catalog.sql script manually (located in the $ORACLE_HOME/ rdbms/admin directory) if you aren t using the Database Configuration Assistant. The catalog.sql script creates the data dictionary tables, views, and synonyms, and they re the first set of objects to populate the database. The data dictionary, once created, has to remain in the System tablespace. In the rest of the chapter, you ll see detailed references to the DBA data dictionary tables only, because the focus here is on database management. There are many data dictionary tables and views. You ll examine the most useful of the data dictionary views in the next few sections.
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Using the Static Data Dictionary Views
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The data dictionary contains metadata about your database. The data dictionary tables and the views based on them are called static, because the running database instance doesn t modify data in
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these tables and views. The tables and views are modified only if you make a change to the data dictionary itself, for example, by creating a table or a new user. No matter whether you manage the database manually or use sophisticated GUI-based management tools, the data dictionary (along with the dynamic performance tables) is the source for all information about the database.
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