There's an easy way to speed up certain types of purge programs. You can use this technique if the file you're purging records from has any dependent logical files attached to it. If so, you should consider using the Remove Member (RMVM) command to remove the logical file members before running the purge job and then adding them back in afterward with the Add Logical File Member (ADDLFM) command.
The reason this can improve the performance of purge jobs is that, every time a record is deleted, access paths for dependent logical files are also updated. So, if you're deleting a large number of records, you would want to remove any dependent logical file members, run the purge program, reorganize the physical file to drop the deleted records, and then re-add the logical file members. If the purge program accesses the file through a logical file, don't remove the member for that specific logical file.
It is not necessary to delete the logical files; just remove the members. The object definition will remain on disk. When you add the logical file member back in, the access path will be re-created. I sped up a month-end transaction file purge from 12 hours to 7.5 hours with this technique.
- Andre Nortje
Business users want new applications now. Market and regulatory pressures require faster application updates and delivery into production. Your IBM i developers may be approaching retirement, and you see no sure way to fill their positions with experienced developers. In addition, you may be caught between maintaining your existing applications and the uncertainty of moving to something new.
IT managers hoping to find new IBM i talent are discovering that the pool of experienced RPG programmers and operators or administrators with intimate knowledge of the operating system and the applications that run on it is small. This begs the question: How will you manage the platform that supports such a big part of your business? This guide offers strategies and software suggestions to help you plan IT staffing and resources and smooth the transition after your AS/400 talent retires. Read on to learn:
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