Concurrent Prefix Update function
The Prefix Update function (program name PRPURGP0) replaces the IMS utilities that update the pointers in the prefixes of logically related segments to establish the logical relationships.
You can run the Prefix Update function as a stand-alone utility, under the IMS region controller, or concurrently as the output of any Prefix Resolution function.
The Prefix Update function (PRPURGP0) can be invoked during the Logical Twin Resolution phase (PRPURG30) of any Prefix Resolution function. Specify UPDATE(Y) with the HIPO function.
When you specify UPDATE(Y), prefixes are updated for any database data set group that has either the DD statement present in the JCL or a dynamic allocation member available. All other output records are written to the DFSURWF3 data set.
You can run the Prefix Update function concurrently with the Logical Twin Resolution phase (program name PRPURG30/DFSURG10) by specifying UPDATE(Y). Concurrent Prefix Update updates any physical data set that has a DD statement for it in the JCL; the Logical Twin Resolution phase does not write work file records for those data sets to DFSURWF3. The Concurrent Prefix Update function improves performance about 10 percent over Stand-alone Prefix Update.
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