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Use the DBMS_AUTO_TASK_ADMIN package to enable and disable the Automatic SQL Tuning Advisor job during the Scheduler maintenance window. The ENABLE procedure helps you enable the Automatic SQL Tuning Advisor task: begin dbms_auto_task_admin.enable ( client_name => 'sql tuning advisor', operation => 'NULL', window_name='NULL'); end; The value NULL for the WINDOW_NAME parameter will enable the task in all maintenance windows. To specify the task in a specific maintenance window, specify a window name, as shown here: begin dbms_auto_task_admin.enable ( client_name => 'sql tuning advisor', operation => 'NULL', window_name='monday_night_window'); end; To disable the Automatic SQL Tuning Advisor task, execute the DISABLE procedure, as shown here: begin dbms_auto_task_admin.disable ( client_name => 'sql tuning advisor', operation => 'NULL', window_name='NULL'); end;

system, alerting subscribers of potentially interesting occurrences. An interrogative sentence is a request for information, such as a method that returns data. When applied to software interactions, I ll call sentence types interaction types. Table 9-2 shows software examples for each interaction type.

The SQL*Plus CONNECT command helps you connect as a different user, once you re logged into SQL*Plus. You can also log into a different database after you re connected to one database by using the CONNECT command. In the following example, I use the CONNECT command to connect as a different user: SQL> CONNECT newuser/newuser_passwd Connected. SQL> In the following example, I connect to a different database from within SQL*Plus by providing the connect identifier as part of the CONNECT command: SQL> CONNECT salapati/sammyy1@orcl Connected. SQL> Just make sure that you have the remote database connection information in your tnsnames.ora file before connecting to the different database. You can use the CONNECT command from within SQL*Plus with the / AS SYSDBA and / AS SYSOPER syntax, as shown here: CONNECT CONNECT CONNECT CONNECT CONNECT sys/sammy1@prod1 as sysdba / AS SYSDBA username/password AS SYSDBA / AS SYSOPER username/password AS SYSOPER

You can also start a SQL*Plus session without connecting to a database by using the /NOLOG option with the sqlplus command when starting a new SQL*Plus session. You may do this, for example, when you re starting the database, or if you just want to use SQL*Plus editing commands to write or edit scripts. Once the SQL*Plus session starts, you can connect to a database using the CONNECT command. Here s an example using the NOLOG option: $ sqlplus /NOLOG SQL*Plus: Release 11.1.0.6.0 - Production on Wed Jan 2 18:35:25 2008 Copyright (c) 1982, 2007, Oracle. All rights reserved. SQL> SHO USER USER is " " SQL> SHO SGA SP2-0640: Not connected SQL> CONNECT salapati/sammyy1 Connected. SQL>

If you are using the SQL*Plus GUI on a Windows machine, click the SQL*Plus icon, and the interface will prompt you for your username. As long as your connection to the database is established through the proper entries in the tnsnames.ora file (see 11 for more information on this file), you are all set to use the SQL*Plus interface. You can use the SQL*Plus utility in both manual and scripted noninteractive modes. It stands to reason that you would want to perform sensitive administration tasks, such as database recovery, in an interactive mode. On the other hand, you can automate routine processing of SQL with scripts, and your SQL commands will then run noninteractively. In either case, the commands are the same it is just the mode in which you issue the commands that is different. The SQL*Plus connect command has the following syntax: CONN[ECT] [{ logon | / } [AS {SYSOPER | SYSDBA | SYSASM}]]

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In Oracle Database 11g, the SQLPLUS command has a new -F argument to enable SQL*Plus to receive Fast Application Notification (FAN) events from a RAC database.

You can connect as a user with the SYSOPER, SYSDBA, or SYSASM privileges to perform privileged operations such as shutting down the database and starting it or backing up and recovering the database. The SYSASM privilege is new in Oracle Database 11g and is meant as a device to separate normal database administration and Automatic Storage Management (ASM) tasks. You ll learn more about the SYSASM system privilege in 17, which discusses ASM.