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Now the manager with the ID 122 can query the my_employees view just as he or she would a normal table, but it gives this manager information on his or her employees only. Listing 7-16 shows the output of a query on the view. Listing 7-16. Selecting Data from a View SQL> SELECT * FROM my_employees; EMPLOYEE_ID FIRST_NAME ----------- ----------133 Jason 134 Michael 135 Ki 136 Hazel 188 Kelly 189 Jennifer 190 Timothy 191 Randall 8 rows selected SQL> LAST_NAME --------Mallin Rogers Gee Philtanker Chung Dilly Gates Perkins SALARY -----3300 2900 2400 2200 3800 3600 2900 2500

Database Directories (for Data Storage)

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You can also specify multiple base tables or even views in the FROM clause, when creating a view. The views you create thus are called join views, and the following example shows the creation of one such view: SQL> CREATE VIEW view_1 AS SELECT ename, empno, job,dname FROM employee, dept WHERE employee.deptno IN (10, 60) AND employee.deptno = DEPT.DEPTNO; Although you use views mostly for querying purposes, under some circumstances you can also use INSERT, DELETE, and UPDATE views. For example, you can perform a DML operation on a view if it doesn t have any GROUP BY, START WITH, or CONNECT BY clauses, or any subqueries in its SELECT clause. However, since a view doesn t really exist, you ll be modifying the underlying table data, and the view will therefore be subject to the same integrity constraints as the underlying base tables. The following example shows how to insert rows into a view named sales_view, which depends on the employees table. SQL> INSERT INTO sales_view VALUES (1234, 'ALAPATI', 99); The previous statement inserts the new row into the underlying base table named employees. Updates, deletes, and inserts on a view are subject to a few restrictions. For example, when you use a CHECK constraint when creating a view, you can t insert a row or update the base table with that row, if the view can t select the row from the underlying base table. You can drop a view by simply using the DROP VIEW command, as shown here: SQL> DROP VIEW my_employees; View dropped. Instead of dropping and re-creating a view, you can also use the OR REPLACE clause to redefine a view, as shown in the following example: SQL> CREATE OR REPLACE VIEW view1 AS SELECT empno, ename,deptno FROM employee WHERE deptno=50;

Of course, the Oracle home directory is only for the Oracle binaries. The DBA must also create separate database directories for locating the data files, control files, redo logs, and other files. The Oracle installer suggests a subdirectory of the Oracle base directory for locating these files. However, the system administrator must create separate directories for the database-related files. Ideally, these directories must be created on separate physical devices. This way, you can distribute physical I/O as well as have different devices for locating your duplexed control files and redo log files. Although same drive can be used for creating all the directories, it won t be possible to fully implement the OFA guidelines. Create multiple database directories using the following format (adjusted for your requirements), and make sure that the oracle user has write permissions on them: $ mkdir -p /prod10/oradata/prod $ chown -R oracle:oinstall /prod10/oradata/prod $ chmod -R 775 /prod10/oradata/prod

If there are other views in a database that depend on a replaced view, they ll become unusable. You can recompile an invalidated view by executing the ALTER VIEW statement. If a PL/SQL program unit such as a procedure or function depends on the view, the database may invalidate that program unit if the changes in the new view pertain to the number of view columns or the column names in the view or the data types.

As I mentioned earlier in this chapter, Oracle strongly recommends that you maintain a flash recovery area for storing all recovery-related files. You must place the recovery files on a different physical disk from the database files, to prevent a disk failure from affecting both the current database files and the recovery files. Here s an example showing how to create and set the appropriate owner, group, and permissions on the directory for the flash recovery area. I named the subdirectory flash_recovery_area, but it could be anything that you specify using the DB_RECOVERY_FILE_DEST parameter: $ mkdir -p /prod20/oradata/prod/flash_recovery_area $ chown -R oracle:oinstall /prod20/oradata/prod/flash_recovery_area $ chmod -R 775 /prod20/oradata/prod/flash_recovery_area

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