# Control Parameters

The functions that the LTA Services Utility must perform are determined by the keywords and operands on the `EXEC` statement’s PARM parameter.

The following table lists the supported values.

Services Utility Control Parameters
Keyword | Operand | Description
--- | --- | ---
`-B` | `None` | Access the log backward, starting with the most current entry.
`-C` | `{N |Y, N}` | Copy the records to the `ARCHIVE` DD Name. The default is N.
`-F` | `{1 | 1, 2, 3, X}` | Specify the format of the report. Set the value to X if no report is desired.
`-G` | `{2 | 0 - 4}` | Specify the debug level for Log Services. The value 0 means no messages; 4 means many messages.
`-H` | `0 - 4` | Specify the debug level for VSAM access. The values are the same as those for -G. Reset to 0 (zero) if the `SXLDEBUG` DD statement is missing.
`-I` | `{V | V, A}` | Specify the input to processing: VSAM (default) or Archive (print an archive file). If the input is Archive, the `-C` and `-R` keywords cannot use the `Y` operand and you must not specify the `-B` keyword.
`-N` | `0-99999999` | Specify the number of records to read. The default is no limit.
`-R` | `{N | Y, N}` | Reset the VSAM cluster to empty. Reset the first two records only and do not rewrite the entire file. The default is N.
`-S` | `0-99999999` | Specify the number of records to skip. The default is none.
`-X` | `{N | Y, N}` | Create a log from a newly defined cluster, which must be done before other operations can be performed on the log. The default is N. Must specify or default `-FX -IV -RN -CN` with -XY.

Note: If you intend to use VSAM DISK LOGGING or TRACING on a heavily used Substation ES, you can reduce the overhead of the VSAM disk I/O by increasing the VSAM "RECSZ" parameter found in JOB userhlq.JCL(SXGLDEF). For Log VSAM file, try changing 2400 to 8096 (the size will vary based on machine and disk throughput). For the Trace VSAM file, try changing 9600 to 16384. To get the best results for your installation, you will have to try different sizes (8K, 12K, 16K, etc).
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