Libraries included with the OpenVMS Alpha operating system kit are installed in data-reduced (compressed) format. Unless disk space is limited, HP recommends expanding (decompressing) these libraries to give the system faster access to them.

The libraries included with the OpenVMS Integrity servers operating system kit are installed in expanded (uncompressed) format. HP recommends keeping the libraries in expanded format. Compressing them can hinder system performance. You can use the command procedure SYS$UPDATE:LIBDECOMP.COM to decompress, compress, or list the sizes of the system libraries.

To expand libraries that are in data-reduced format or compress libraries that are in expanded format, use the OpenVMS Library Decompression utility (LIBDECOMP.COM). The utility runs on both OpenVMS Alpha and Integrity server systems. To run the utility, enter the following command:

$ @SYS$UPDATE:LIBDECOMP

For more information about the utility, you can request help by entering the following command:

$ @SYS$UPDATE:LIBDECOMP HELP

You can list the sizes and format (reduced or expanded) of the libraries by using the following command:

$ @SYS$UPDATE:LIBDECOMP LIST

For complete information about expanding and reducing system library files and using LIBDECOMP.COM, see the HP OpenVMS System Manager's Manual, Volume 2: Tuning, Monitoring, and Complex Systems.

Table 15 lists the libraries that ship on OpenVMS Version 8.4 and shows the approximate sizes of the libraries in both data-reduced (compressed) and expanded format. Note that library sizes differ for Alpha and Integrity server systems.