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Oracle PL/SQL for DBAs
book

Oracle PL/SQL for DBAs

by Arup Nanda, Steven Feuerstein
October 2005
Intermediate to advanced content levelIntermediate to advanced
454 pages
14h 44m
English
O'Reilly Media, Inc.
Content preview from Oracle PL/SQL for DBAs

Managing Windows

Windows are defined durations within which a specified job runs. Using windows, you can control how resources (e.g., CPU, parallel query servers, undo pool size) are allocated and governed. When a job runs, the resource allocation method specified by the window active at that time is in effect, and it controls the resource allocation for that job.

A window has three distinct components:

  • A schedule, which defines the starting time of the window

  • A time duration of the window, indicating how long it is open

  • A resource allocation plan that is applied to a job attached to the window

The first component may be specified using either a calendar string or a named schedule, as I described earlier for jobs. The third component may be specified via a resource manager plan, as described for programs in the previous section. In the following sections, I’ll explain the second component, the time duration of windows.

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Publisher Resources

ISBN: 0596005873Supplemental ContentErrata Page