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Ensure that database statistics are the most current.
If database utilization is running at high throughput rates, consider disabling some or all
database auto-maintenance tasks to avoid impacting peak throughput. However, if you
disable these capabilities, be sure to perform runstats regularly to update database
statistics.
Use your database vendor’s tool to obtain recommendations for indexes to create; this
step is necessary because different applications often require unique indexes. Create the
indexes that are suggested by the database vendor’s tool.
4.5.2 Tune the Event Manager
This section offers tuning suggestions for the Event Manager.
Tune BPD queue size and worker thread pool size
To optimize throughput and scaling, a necessary step is often to set the BPD Queue Size and
Worker Thread Pool parameters to larger values than their defaults. These values are defined
in the file 80EventManager.xml file in the configuration directory for the Process Server. The
specific configuration directory is as follows:
%BPM%/profiles//config/cells//nodes//servers/
server1/process-center or process-server/config/system
To change the values, directly edit that file. Here are several guidelines for tuning these
parameters:
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Start with a BPD Queue Size (bpd-queue-capacity) of 10 per physical processor core (for
example, 40 for a four-processor core configuration), with a maximum value of 80. Tune as
needed after that, based on the performance of your system.
Start with a Worker Thread Pool Size (max-thread-pool-size) of 30 + 10 per physical
processor core (for example, 70 for a four-processor core configuration), with a maximum
value of 110. Tune as needed after that, based on the performance of your system.
Tune the Number of Timer Events
For BPDs with many timers, reduce the amount of Event Manager activity by reducing the
number of timer events that are held in memory through the following change to the
80EventManager.xml file in the profiles directory (the full path to this file is in “Tune BPD queue
size and worker thread pool size” on page 58); the default is 60000:
5000
4.5.3 Optimize business data search operations
If slow response times, or high database usage, are observed when performing business data
searches, do the following tasks:
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Ensure that no more than 10 business data variables are defined. If there are more than
10 of these variables, examine your business requirements to determine if all the variables
are required. Our experience shows that 10 or less is generally sufficient.
Enable Process Search optimizations through the Saved Search Accelerator Tools for the
Process Server. This technique is often much faster, and uses fewer database resources,
than the default mechanism. The Process Search optimizations can be enabled by using
command-line tools, as described at the following location:
http://pic.dhe.ibm.com/infocenter/dmndhelp/v8r0m1/index.jsp?topic=%2Fcom.ibm.wb
pm.main.doc%2Ftopics%2Fctuneprocportal.html
58 IBM Business Process Manager V8.0 Performance Tuning and Best Practices