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DATA DEFINITION, PART I
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You can refer to Oracle Database Reference in the Oracle documentation to get a complete overview of the Oracle data dictionary. Fortunately, the Oracle data dictionary contains a view that lists all Oracle data dictionary views, with a short description of their contents. This view is called DICTIONARY; DICT is a shorter synonym for the same view. Listing 3-9 shows an abbreviated version of the query results. It s abbreviated for a practical reason: the DICT view contains more than 600 rows! Listing 3-9. Using the DICT View select * from dict order by table_name; TABLE_NAME COMMENTS -------------------- ---------------------------------------ALL_ALL_TABLES Description of all object and relational tables accessible to the user ALL_APPLY Details about each apply process that dequeues from the queue visible to the current user ... USER_COL_COMMENTS Comments on columns of user's tables and views USER_COL_PRIVS Grants on columns for which the user is the owner, grantor or grantee ... V$TIMEZONE_NAMES Synonym for V_$TIMEZONE_NAMES V$VERSION Synonym for V_$VERSION 610 rows selected. Data dictionary view names typically have prefixes that suggest the existence of four main categories. In Listing 3-9, you can see the ALL, USER, and V$ prefixes. The fourth common prefix is DBA. The idea behind this is that, most of the time, you are interested in information about a certain subcategory of database objects. By using the appropriate views, you automatically suppress information that is not of interest to you. Also, depending on your database privileges, you will not be allowed to use certain categories of data dictionary views. Table 3-4 lists the most common data dictionary view name prefixes. (Note that not all data dictionary views have one of these prefixes.) Table 3-4. Common Data Dictionary View Prefixes
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USER_... ALL_... DBA_... [G]V$...
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Information about your own objects Information about all objects you can access All information in the database; for database administrators only Dynamic performance views; for database administrators only
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DATA DEFINITION, PART I
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The dynamic performance views (those with a V$ or GV$ name prefix) are a special category. These views are not based on database tables, but rather on information from other sources such as internal memory structures. They are mainly relevant for, and accessible to, database administrators. Most data dictionary view names give a clear indication of their contents; however, as a consequence, some of these names are very long. That s why some of the most popular data dictionary views also have alternative (shorter) synonyms, such as CAT, OBJ, IND, TABS, and COLS. The CAT view is an especially useful one, because it lists the objects in the current schema. Listing 3-10 shows an example of using the CAT view with our BOOK schema. Listing 3-10. Using the CAT View select * from cat; TABLE_NAME -----------------------------EMPLOYEES DEPARTMENTS SALGRADES COURSES OFFERINGS REGISTRATIONS HISTORY TABLE_TYPE ----------TABLE TABLE TABLE TABLE TABLE TABLE TABLE
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Suppose you want to query a specific data dictionary view, and you don t know the actual column names of that view. In that case, you can use the SQL*Plus command DESCRIBE, just as you would do for regular tables. As you can see in Listing 3-11, you can use the DESCRIBE command, or you can query the data dictionary view DICT_COLUMNS. Listing 3-11. Using the DESCRIBE Command and the DICT_COLUMNS View describe ALL_USERS Name Null Type USERNAME NOT NULL VARCHAR2(30) USER_ID NOT NULL NUMBER CREATED NOT NULL DATE select column_name, comments from dict_columns where table_name = 'ALL_USERS'; COLUMN_NAME --------------------------USERNAME USER_ID CREATED COMMENTS ------------------------Name of the user ID number of the user User creation date
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Listing 3-12 shows a query against the NLS_SESSION_PARAMETERS view (NLS stands for National Language Support). The result shows, for example, the NLS_DATE_FORMAT value used to display dates.
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