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Technical Note
Reducing the CPU usage of JQM servers
in an SAP environment
This technical note provides information about reducing the CPU usage of JQM servers during OMSCB server
polling by indexing the -erp-job-retention-period attribute in the job table of the JQM server using the
dbindex utility.
NOTE: All JQM servers responsible for processing SAP jobs should be indexed.
Problem
The CPU usage of JQM servers increases when the OMSCB server polling option is enabled.
Solution
The OMSCB server queries JQM servers to get retained jobs with erp-job-retention-period greater than
zero. As the OMSCB server queries according to the poll interval that is set, the JQM server is queried each time with
current-job-state and erp-job-retention-period as the filtered attributes. This leads to an increase
in CPU usage of the JQM server when the number of jobs in the database is large. To minimize the time required to
search jobs in the database, specific job attributes are indexed in the job table of the server. Indexing the
erp-job-retention-period attribute also reduces the memory usage of the JQM server. Indexing the
attributes in the JQM server is equivalent to the traditional method of indexing in a database, where specific keys are
maintained separately to facilitate faster record retrievals.
The JQM server indexes a default set of attributes that represents the common attributes used to search jobs.
Searching for a job or a set of jobs qualified only by these indexed attributes, for example by using the pdls
command, is faster than searches qualified by non-indexed attributes. However, mixing both indexed and
non-indexed attributes results in slower searches as compared to the searches made by using only indexed attributes,
because filtering of the results by the non-indexed attributes need to be filtered. Qualifying searches only by
non-indexed attributes produces slow search results.
For OMSCB server polling, the current-job-state and erp-job-retention-period attributes need to
be indexed for a faster search and reduction in the CPU usage of the JQM server. The current-job-state
attribute is one of the default indexed attributes in the database of the JQM server. Hence, the
erp-job-retention-period attribute should be indexed using the dbindex utility.
If you experience slow search results, use the dbindex utility to modify the jobs table of the JQM server. The
dbindex utility indexes specific attributes and helps obtain search results qualified by those attributes at a faster
rate.
HP Output Server 3.5
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