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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.

There are certain inherent differences between objects and ICs, due to the fact that the former are abstractions, while the latter are real In the real world of signals, you need to deal with the physical characteristics of conductors, transmission lines, and signals Hardware pins are classified as input, output, or input/output An I/O pin can support both input and output, but can only do one thing at a time It can also do neither, acting as if the internal circuitry has been disconnected from the pin This internal disconnection requires the pin to support something called tri-state mode, in which the pin is put into high impedance mode and disconnected from any internal input or output circuits Tristate mode is required on all output pins that can be connected to a wire that other output pins are connected to.

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

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;

Only one of the output pins connected to a wire can be active at a given time All other pins connected to the wire must either be inputs or outputs in tri-state mode If two output signals were active at the same time and connected to the same wire, they would fight each other for control over the signal s state (ie, high or low) The strength of an output signal, which connotes the signal s ability to win in a fight, is measured by its impedance The lower the impedance, the stronger the signal Impedances are related to a parameter known as fanout The fanout of an output pin indicates how many inputs it can drive In an ideal situation, the fanout should be infinite: An output pin should be able to drive any number of input pins.

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.