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There are two pseudo-columns called currval and nextval that you can use to query sequence values. The currval pseudo-column provides you with the current value of the sequence, and the nextval pseudo-column gets you the new or next sequence number.
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First, create a sequence as shown in the following example. This is usually the way you use a sequence to generate a unique primary key for a column. SQL> CREATE SEQUENCE employee_seq START WITH 10000 INCREMENT BY 1 NOMAXVALUE
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CHAPTER 7 SCHEMA MAN AGEM ENT
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NOCYCLE; Sequence created. SQL> Second, select the current sequence number by using the following statement: SQL> SELECT employee_seq.currval FROM dual; Third, insert a new row into the employee table using nextval from the employee_seq sequence: SQL> 2 3 4* INSERT INTO employees(employee_id, first_name, last_name, email, phone_number, hire_date) VALUES (employee_seq.nextval,'sam','alapati','salapati.tnt.org' ,345-555-5555,to_char('21-JUN-2005'); 1 row created. SQL> COMMIT; Commit complete. SQL> Finally, check to make sure the employee_id column is being populated by the employee_seq sequence: SQL> SELECT employee_id, first_name, last_name FROM employees WHERE last_name = 'alapati'; EMPLOYEE_ID FIRST_NAME LAST_NAME ------------------------------------10011 sam alapati SQL> Note that you can have an Oracle sequence that is incremented continuously, but there may be occasional gaps in the sequence numbers. This is because Oracle always keeps 20 values (by default) in memory, and that s where it gets the nextval from. If there should be a database crash, the numbers stored in memory will be lost, and there will be a gap in that particular sequence.
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Using Triggers
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Oracle triggers are similar to PL/SQL procedures, but they are automatically fired by the database based on specified events. For DBAs, triggers come in handy in performing audit- and securityrelated tasks. Besides the standard Oracle triggers, which fire before or after DML statements, there are powerful triggers based on system events, such as database startup and shutdown and the users logging on and logging off. 11 shows you how to use triggers to enhance database security. You create a trigger with the CREATE TRIGGER statement. You can choose to have the trigger fire BEFORE, AFTER, or INSTEAD OF the triggering event. The following example shows the structure of the CREATE TRIGGER statement for a BEFORE event trigger. Before a DML statement can delete, insert, or update a row in the employees table, Oracle automatically fires this trigger: SQL> CREATE TRIGGER scott.emp_permit_changes BEFORE DELETE OR INSERT OR UPDATE ON employees . . . /* Your SQL or PL/SQL code here
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CHAPTER 7 SCHEMA MAN AGEM ENT
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When you create a trigger, it is enabled by default. If you want to temporarily disable a trigger for some reason, you use the following statement: SQL> ALTER TRIGGER test DISABLE; You can reenable this trigger by using the following command: SQL> ALTER TRIGGER test ENABLE;
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There are several important data dictionary views you can use to find out detailed information about any of the database objects discussed in this chapter. DBAs also make heavy use of data dictionary views to manage various schema objects. I provide a brief list of the important views here, some of which were explained earlier in the chapter. To get complete information about the types of information you can glean from each of these views, use the SQL command DESCRIBE (as in DESCRIBE DBA_CATALOG.
Views for Managing Database Objects
In this section, you ll look at the important data dictionary views that help you manage nondata objects (that is, objects other than tables and indexes). The following is a list of the important data dictionary views for looking up various database objects: DBA_SYNONYMS: Information about database synonyms DBA_TRIGGERS: Information about triggers DBA_SEQUENCES: Information about user-created sequences DBA_DB_LINKS: Information about database links As mentioned earlier, the DBA_OBJECTS view provides important information on the preceding objects, as well as several other types of database objects. However, the preceding views provide detailed information about the object, such as the source text of a trigger, which you won t get from the DBA_OBJECTS view. You manage objects such as tables and views by referring to the data dictionary views, such as DBA_TABLES and DBA_VIEWS. There are also separate views for partitioned tables. Let s look at the key table- and index-related dictionary views.
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