Using the Node Management Services (NMS) Utilities (MPE/iX 7.0, 7.5)

Chapter 4 61
Using NMMGR Utility Screens
Compress Screen
Description
As your configuration grows, you may find it necessary to compress or
expand your configuration file.
Configuration files initially contain 2,048 32-byte records. As you
configure items in a file, records are used sequentially from the
beginning of the file. As the file size increases, the number of free
records at the end of the file decreases.
If you delete items from a configuration file, the records are not
immediately recovered, so the middle of your file may contain some
unused records. Unused records in the middle of the file are not
reflected in the number of free records count and are not available for
reuse. By compressing the file, you cause all data to be stored in a
contiguous block of records and all unused records to be located at the
end of the file. Thus, compressing a file enables you to determine the
actual number of free records in a file before adding or deleting records.
To compress a file, enter a 0 in the Number of Additional Records field
and press
[Compress File]
You can also use this function to add records to the file or to delete
unused records from the file. To do so, enter a number in the Number of
Additional Records field. A positive number causes records to be added
(up to the file size limit of 65,535 records). A negative number causes
that number of free records to be deleted from the file. After you have
entered the number of records to be added or deleted, press the
[Compress File] key.
When you press
[Compress File], NMMGR begins compressing the file
immediately. The terminal is locked to indicate that NMMGR is not
available until finished. When the compression is completed, NMMGR
prints the following message in the message field:
Configuration file compressed.
NOTE Compress time depends on the number of entries in the file. For a file
that contains a small amount of data, compression usually takes fewer
than 30 seconds. However, compressing a file that contains a lot of data
can take several minutes.
Fields Current File Size
(Display only.) Size of the file, in 32-byte records.
Number of Free Records
(Display only.) Number of free records at the end of the
configuration file.