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IBM does not intend to provide a solution to this request at this time, so it is being closed.
For the API used in your example, QUSROBJD, perhaps a work-around would be to subset the data requested by object type. Another possible method for retrieving this information would be to use the OBJECT_STATISTICS table function. https://www.ibm.com/support/knowledgecenter/ssw_ibm_i_73/rzajq/rzajqudfobjectstat.htm
The CAAC has reviewed this requirement and recommends that IBM not implement this request. There are work-arounds that can be used, so IBM should not increase the max size of a user space.
Background: The COMMON Americas Advisory Council (CAAC) members have a broad range of experience in working with small and medium-sized IBM i customers. CAAC has a key role in working with IBM i development to help assess the value and impact of individual RFEs on the broader IBM i community, and has therefore reviewed your RFE.
For more information about CAAC, see www.common.org/caac
For more details about CAAC's role with RFEs, see http://www.ibmsystemsmag.com/Blogs/i-Can/May-2017/COMMON-Americas-Advisory-Council-%28CAAC%29-and-RFEs/
Nancy Uthke-Schmucki - CAAC Program Manager
It is unlikely that we would "increase the size" of a user space. User spaces serve a purpose, but there are other storage methods available to handle amounts of data larger than 16Mb. APIs that return enough data to go over the 16Mb limit usually can be circumvented by requesting a different subset of data. When that is not possible (or not desirable) another method should be implemented by the API.
Some API's which can return a large amount of data already use other methods to return that data. For example, QUSLJOB returns data into a user space, but it has an optional "continuation handle" to keep track of where it left off so the API can be called multiple times to return all the data. QGYOLMSG makes use of a byte stream file to return up to 2Gb of data.
Keeping the 16MB limit on user spaces is not the worst thing if there is a good workaround (as already suggested). Returning a reference to any additional userspaces would be a nice option.
There was a 3rd party solution to this by one of the people who wrote the original user space code. It worked by using exception trapping to auto-create additional user spaces when the current one hit the limit. Earlier attempts to get ibm to increase the size limit have been rejected because they didn't want to chance breaking the SPACE code since its use is pervasive in the system. My recommendation would be to request a modern alternative to auto-size user spaces. Perhaps one that uses the C language memmap function with IFS stream files.