MODIFY COMPRESS command
Abbreviations
Operand | Abbreviation |
---|---|
MODIFY | F |
Purpose
Using the MODIFY COMPRESS command, you can change the value of the data compression levels originally set by the CMPVTAM start option or by an APPL definition statement.
- 0
- No compression
- 1
- Run-length encoding (RLE)
- 2
- Small adaptive compression table
- 3
- Medium adaptive compression table
- 4
- Large adaptive compression table
See the z/OS Communications Server: SNA Network Implementation Guide for additional information about compression.
Operands
- procname
- The procedure name for the command. If procname in the START command was specified as startname.ident, where startname is the VTAM® start
procedure and ident is the optional identifier,
either startname.ident or ident can be specified for procname.
If procname in the START command was startname, startname must be specified for procname.
- CMPAPPLI=input_limit
- Specifies the input compression limit for the application. This operand allows compression-level limits for a specific application
to be set lower than the overall limit specified by the CMPVTAM start
option.
The valid range is 0–4. Zero specifies no compression.
The valid range is 0–1. Zero specifies no compression.
The limit specified by this operand is in effect only during sessions for which the application acts as the PLU and when the limit is lower than that specified by the CMPVTAM start option.
- CMPAPPLO=output_limit
- Specifies the output compression limit for the application. This operand allows compression-level limits for a specific application
to be set lower than the overall limit specified by the CMPVTAM start
option.
The valid range is 0–4. Zero specifies no compression.
The valid range is 0–1. Zero specifies no compression.
The limit specified by this operand is in effect only during sessions for which the application acts as the PLU and when the limit is lower than that specified by the CMPVTAM start option.
- CMPVTAM=overall_limit
- Specifies the overall compression limit for VTAM sessions. The new compression
limit takes effect on new sessions that are started after you issue
this command. Sessions that were started before this command are not
changed.
The valid range is 0–4. Zero specifies no compression.
The valid range is 0–1. Zero specifies no compression.
- ID=appl_name
- Specifies the name of the application to which compression applies. This allows modification of the compression limit for the session as set in the APPL definition statement. The ID operand is required when either CMPAPPLI or CMPAPPLO is specified.