z/OS DFSMS OAM Application Programmer's Reference
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Performance considerations

z/OS DFSMS OAM Application Programmer's Reference
SC23-6865-00

Allowing page release by specifying RELBUF=YES on a STORE request minimizes unnecessary page-outs of buffer segment pages to auxiliary storage after they have been written to object storage.

Attention: RELBUF=YES may release pages that contain data that has not been committed to the database.

A generic QUERY request may use large amounts of instructions and virtual storage for the output, plus slow other accesses to the directory.

Database synchronization should follow the OSREQ invocation as soon as possible to minimize contention for resources.

When processing quantities of large objects, interactions among the following factors can degrade performance: virtual and real storage requirements, paging and auxiliary storage, data input/output, and movement (copying) of object data. All of these considerations can be affected by how the object data is structured by the application and what additional processing is required for OAM to complete the request. Applications can optimize the object data storage to minimize the impact of these considerations, as described in the next section.

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