Application scheduler collection

The application scheduler collection panel provides a list of existing...schedulers?. Each of the headings is described here. To add and configure a new application scheduler, select: Resources > Schedulers > New .

Configuration Tab

Configuration tab

Under the General Properties heading is a list of all fields needed for a scheduler.
Scope
Scope specifies the level at which the resource definition is visible. See Administrative console scope settings Administrative console scope settings for more information.
Name
The name of the application scheduler.
Data Type
String
JDNI Name
The JNDI name for the scheduler.

The JNDI name specifies where this scheduler instance is bound in the namespace. Clients can look this name up directly, although the use of resource references is recommended.

Data Type
String
Data source JNDI name
Data source where persistent tasks are stored.

Any data source available in the name space can be used with a application scheduler. Multiple schedulers can share a single data source while using different tables by specifying a table prefix.

Data Type
String
Table prefix
The prefix to apply to all of the application scheduler tables and indices. This can optionally include a schema name if the database requires one.
Data Type
String
Poll Interval
The time interval the application scheduler daemon polls the database.

Each poll operation can be expensive. If the interval is extremely small and there are many scheduled tasks, polling can consume a large portion of system resources.

Data Type
Integer
Units
Seconds
Default
30
Range
Any positive long integer
Work Managers
Specifies what work managers used by this application scheduler.

The work manager is a server object that serves as a logical thread pool for the scheduler. Each repeating task that is created using this scheduler will use the "Number Of Alarm Threads" specified in the work manager, which affects the number tasks that can run concurrently. Use the work manager"Service Names" property to limit the amount of context information that is propagated to the task when it runs.

The task is run in the work manager associated with the scheduler instance. Configuring a scheduler with a specific work manager enables you to control how many tasks are actively running at a given time.

Verify tables
Validates that scheduler data sources, table prefixes, security authentication information and tables are configured correctly.

You can use this verification method in production and development environments without altering database properties.

Create tables
Creates the necessary tables and indices required for a scheduler to operate.

This method of creating scheduler tables is designed for simple topologies and development environments. Use the supplied scheduler data definition language files for advanced or production environments and for databases that do not support this feature. For details, see the topic Creating and configuring application schedulers using the administrative console.

Drop tables
Specifies the removal of tables and indices required for schedulers to operate.

This method of removing scheduler tables and indices is recommended for development environments and does not delete previously scheduled tasks.

Sample

This little sample copies "here" to "there":
copy from here to there

Copyright IBM Corp. 2003, 2005 |