Trace Data Set Initialization

If IPCS identifies a data set as possibly being a trace data set, it issues message BLS18099D to verify the way you want to use the data set:

BLS18099D Treat input only as trace data?  Enter Y for yes, N for
full initialization

Respond Y if you wish to treat the input data set as a trace data set. Respond N if you want IPCS to begin full initialization.

For trace data sets only, IPCS bypasses normal initialization and improves the performance of trace processing by commands such as the GTFTRACE subcommand. During trace data processing, information about dumps in the dump directory is not available. Subcommands such as LISTDUMP do not work in this mode.

This mode of accessing trace data sets provides a significant performance improvement over the normal mode of access, which involves full initialization, particularly for those trace data sets residing on multi-reel tape volumes.

Note: IPCS verifies the way you want to use the data set only when the CONFIRM default value is in effect. If NOCONFIRM is in effect, IPCS automatically assumes a response of Y to message BLS18099D. CONFIRM is the default. See Setting Session Defaults for more information about setting defaults.