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Oracle® Fusion Middleware Performance and Tuning for Oracle WebLogic Server
11g Release 1 (10.3.6)

Part Number E13814-06
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19 Tuning Web Services

This chapter describes Oracle best practices for designing, developing, and deploying WebLogic Web Services applications and application resources.

Web Services Best Practices

Design and architectural decisions have a strong impact on runtime performance and scalability of Web Service applications. Here are few key recommendations to achieve best performance.

Tuning Web Service Reliable Messaging Agents

Web Service Reliable Messaging provides advanced store-and-forward capability for high-performance message forwarding from a local server instance to a remote destination. See "Understanding the Store-and-Forward Service" in Configuring and Managing Store-and-Forward for Oracle WebLogic Server. The following section provides information on how to get the best performance from Store-and-Forward (SAF) applications:

Tuning Heavily Loaded Systems to Improve Web Service Performance

The asynchronous request-response, reliable messaging, and buffering features are all pre-tuned for minimum system resource usage to support a small number of clients (under 10). If you plan on supporting a larger number of clients or high message volumes, you should adjust the tuning parameters to accommodate the additional load, as described in the following sections:

Setting the Work Manager Thread Pool Minimum Size Constraint

Define a Work Manager and set the thread pool minimum size constraint (min-threads-constraint) to a value that is at least as large as the expected number of concurrent requests or responses into the service.

For example, if a Web service client issues 20 requests in rapid succession, the recommended thread pool minimum size constraint value would be 20 for the application hosting the client. If the configured constraint value is too small, performance can be severely degraded as incoming work waits for a free processing thread.

For more information about the thread pool minimum size constraint, see "Constraints" in Configuring Server Environments for Oracle WebLogic Server.

Setting the Buffering Sessions

The reliable messaging and buffering features use JMS queue sessions to send messages to the reliability/buffer queues. By default, WebLogic Server allocates 10 sessions for buffering which enables 10 clients to enqueue messages simultaneously onto the reliability/buffer queue.

For asynchronous request-response, the request and response portion of the communication exchange count separately, as two clients. In this case, the default pool of sessions can support five simultaneous asynchronous request-response clients. To accommodate the number of concurrent clients you expect in your application, set the following parameter to twice the number of expected client threads:


Releasing Asynchronous Resources

When using the asynchronous request-response feature, WebLogic Server persistently stores information about the request until the asynchronous response is returned to the client. These resources remain in the persistent store until they are released by a background thread, called the store cleaner.

Often, these resources can be released sooner. Executing the store cleaner more frequently can help to reduce the size of the persistent store and minimize the time required to clean it.

By default, the store cleaner runs every two minutes (120000 ms). Oracle recommends that you set the store cleaner interval to one minute (60000 ms) using the following Java system property: