Oracle DBA FAQ - Introduction to Command-Line SQL*Plus Client Tool

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By: FYIcenter.com

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How Run SQL*Plus Commands That Are Stored in a Local File?

If you have a group of commands that you need to run them repeatedly every day, you can save those commands in a file (called SQL script file), and using the "@fileName" command to run them in SQL*Plus. If you want to try this, create a file called \temp\input.sql with:

SELECT 'Welcome to' FROM DUAL;
SELECT 'FYIcenter.com!' FROM DUAL;

Then run the "@" command in SQL*Plus as:

SQL> connect HR/retneciyf

SQL> @\temp\input.sql

'WELCOMETO
----------
Welcome to


'FYICENTER.COM
--------------
FYIcenter.com!

How To Use SQL*Plus Built-in Timers?

If you don't have a stopwatch/timer and want to measure elapsed periods of time, you can SQL*Plus Built-in Timers with the following commands:

TIMING - Displays number of timers.
TIMING START [name] - Starts a new timer with or without a name.
TIMING SHOW [name] - Shows the current time of the named or not-named timer.
TIMING STOP [name] - Stops the named or not-named timer.

The following tutorial exercise shows you a good example of using SQL*Plus built-in timers:

SQL> TIMING START timer_1

(some seconds later)
SQL> TIMING START timer_2

(some seconds later)
SQL> TIMING START timer_3

(some seconds later)
SQL> TIMING SHOW timer_1
timing for: timer_2
Elapsed: 00:00:19.43

(some seconds later)
SQL> TIMING STOP timer_2
timing for: timer_2
Elapsed: 00:00:36.32

SQL> TIMING
2 timing elements in use

What Is Oracle Server Autotrace?

Autotrace is Oracle server feature that generates two statement execution reports very useful for performance tuning:

Statement execution path - Shows you the execution loop logic of a DML statement.
Statement execution statistics - Shows you various execution statistics of a DML statement.

To turn on the autotrace feature, the Oracle server DBA need to:

Create a special table called PLAN_TABLE.
Create a special security role called PLUSTRACE.
Grant PLUSTRACE role your user account.

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