June 2018
Intermediate to advanced
478 pages
10h 52m
English
Content preview from IBM Db2 11.1 Certification Guide
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The WLM objects
The Db2 WLM architecture consists of the following objects:
- Service class: A service class defines a unique execution environment in which units of work can run. This execution environment assigns system resources such as CPU and pre-fetch I/O priority, and controls work via thresholds. The service class will have subclasses defined, where all of the database work is executed within the service subclass. The following table shows the default Db2 WLM superclasses and subclasses:
|
Superclass |
Subclass |
Description |
|
SYSDEFAULTUSERCLASS |
SYSDEFAULTSUBCLASS SYSDEFAULTMANAGEDSUBCLASS |
All user activities run in this class. The heavy weighted queries run in SYSDEFAULTMANAGEDSUBCLASS. |
|
SYSDEFAULTMAINTENANCECLASS |
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