BC remote Oracle DBA - Call (800) 766-1884  
Oracle Consulting Oracle Training Development

Remote DBA

Remote DBA Plans  

Remote DBA Service

Remote DBA RAC

Remote DBA Oracle Home
Remote DBA Oracle Training
Remote DBA SQL Tuning Consulting
Remote DBA Oracle Tuning Consulting
Remote DBA Data Warehouse Consulting
Remote DBA Oracle Project Management
Remote DBA Oracle Security Assessment
Remote DBA Unix Consulting
Burleson Books
Burleson Articles
Burleson Web Courses
Burleson Qualifications
Oracle Links
Remote DBA Oracle Monitoring
Remote DBA Support Benefits
Remote DBA Plans & Prices
Our Automation Strategy
What We Monitor
Oracle Apps Support
Print Our Brochure
Contact Us (e-mail)
Oracle Job Opportunities
Oracle Consulting Prices





Remote DBA services

Remote DBA Support

Remote DBA RAC

Remote DBA Reasons

Remote Oracle Tuning

Remote DBA Links

Oracle DBA Support

Oracle DBA Forum

Oracle Disaster

Oracle Training

Oracle Tuning

Oracle Training

 Remote DBA SQL Server

Remote MSSQL Consulting

Oracle DBA Hosting

Oracle License Negotiation










Oracle Opening a Scheduler Window

Oracle Tips by Burleson Consulting

This is an excerpt from "Oracle 10g New Features for Administrators" by Ahmed Baraka.

• A window will automatically open at a time specified by its START_TIME attribute.

• Only one window can be open at any given time.

• A window can be manually opened:

DURATION => '0 12:00:00')

When you specify the duration, you can specify days, hours, minutes, seconds, in that order.

• You can open an already open window. If you dothis, the duration of the window will    last a timeperiod equal to its duration attribute.

Closing a Window


A running job may close upon the closing of its window,if you create a job with the attribute STOP_ON_WINDOW_CLOSE set to TRUE.

Disabling a Window

• You can only disable a window if no job uses that window or if the window    is not open.

• If the window is open, you can disable it by using the DISABLE with the   FORCE=TRUE attribute.


Dropping a Window

• You can drop a window by using the DROP_WINDOW procedure.

• If a job associated with a window is running, a DROP_WINDOW procedure will continue to run through to completion and is disabled after it completes.

• If you set the STOP_ON_WINDOW_CLOSE attribute to TRUE, however, the job will immediately stop when you drop an associated window.

Prioritizing Jobs

• You can prioritize jobs at two levels: class and job.

• The prioritization at the class level is based on the resources allocated to each resource consumer group by the currently active resource plan. The consumer group that a job class maps to can be specified when creating a job class.

• At job level, the job priority ranges from 1 to 5, with 1 being the highest priority and 3 being the default.

• When you have more than one job within the same class scheduled for the same time, the JOB_PRIORITY of the individual jobs determines which job starts first.

NAME => 'test_job',
ATTRIBUTE => 'job_priority',
VALUE => 1)

Window Priorities

If there are more than one window to open at the same time, the Scheduler will close all windows except one, using the following rules of precedence:

o If two windows overlap, the window with the higher priority opens and the   window with the lower priority closes.

o If two windows of the same priority overlap, the active window remains    open.

o If you are at the end of a window and you have other windows defined for    the same time period, the window that has the highest percentage of time    remaining will open.

Window Groups

• A window group is a collection of windows, and is part of the schema.

• The concept of a window group is for convenience only, and its use purely    optional.

Unsetting Component Attributes


Altering Common Component Attributes

• There are some attributes that are common to all Scheduler components.

• Use the procedure SET_SCHEDULER_ATTRIBUTE to set these    common, or global level, attributes.

• These are the global attributes:


If jobs and windows specifications use the calendering syntax but omit the start date, the Scheduler derives the time zone from the DEFAULT_TIMEZONE attribute.

Oracle recommends that you set the DEFAULT_TIMEZONE attribute to a region’s name instead of absolute time zone offset, in order to ensure that daylight saving adjustments are being taken into account.

LOG_HISTORY  - This attribute refers to the number of days the Scheduler will retain job and window logs.

MAX_JOB_SLAVE_PROCESSES - The Scheduler determines the optimal number of job slave processes, based on your processing requirements. However, you can set a limit on the number of job slave processes using the

MAX_JOB_SLAVE_PROCESSES -  attribute, whose default value is NULL, and the range is from 1 to 999.


If you like Oracle tuning, see the book "Oracle Tuning: The Definitive Reference", with 950 pages of tuning tips and scripts. 

You can buy it direct from the publisher for 30%-off and get instant access to the code depot of Oracle tuning scripts.

Expert Remote DBA

BC is America's oldest and largest Remote DBA Oracle support provider.  Get real Remote DBA experts, call
BC Remote DBA today.



Remote DBA Service

Oracle Tuning Book


Advance SQL Tuning Book 

BC Oracle support

Oracle books by Rampant

Oracle monitoring software







BC Remote Oracle Support

Remote DBA

Remote DBA Services

Copyright ฉ 1996 -  2013 by Burleson. All rights reserved.

Oracleฎ is the registered trademark of Oracle Corporation.

Hit Counter