Guardian User's Guide

Using FUP for Advanced File Management
Guardian User’s Guide—425266-001
8-21
Modifying Partitioned Files
The ALTER command with the PART option changes the file label of the primary
partition so that it includes the new extent size of the secondary partition in $VOL2.
Next, the RENAME command with the PARTONLY option gives the secondary
partition a temporary name; this command preserves the data in this partition.
The SET LIKE command recreates the file-creation parameters of the original secondary
partition. Then the SET EXT command changes the extent size in the current FUP
parameters. The CREATE command recreates the secondary partition with a larger
extent size.
The DUP command with the OLD and PARTONLY options copies the data from the
temporary file to the newly created partition with the DUP command. Finally, the
PURGE command deletes the temporary file.
Although you can RENAME a file that is open for read-write or write-only access, you
cannot copy such a file with the DUPLICATE command. Thus, you must ensure that the
partition is not being written to if the preceding sequence of operations is to succeed.
(File-access modes are discussed in the ENSCRIBE Programmer’s Guide.)
Adding Partitions
You can add partitions to relative and entry-sequenced files that do not already have
them, but not to key-sequenced files. This example uses a nonpartitioned relative file
named $VOL1.SVOL.RELFILE. To add a partition to this file, enter:
The SET LIKE command sets the file-creation parameters to those of the original file,
$VOL1.SVOL.RELFILE. The SET command with the PARTONLY option specifies
that the file to be created is a secondary partition. The CREATE command creates a new
partition on volume $VOL2.
The SHOW command with the EXT option displays the extent sizes of the original file.
The ALTER command with the RELFILE option changes the file label of
$VOL1.SVOL.RELFILE to show that it is the primary partition of a partitioned file with
a secondary partition in the volume $VOL2.
This command adds a third partition on the volume $VOL3:
-VOLUME $VOL1.SVOL
-SET LIKE RELFILE
-SET PARTONLY
-CREATE $VOL2.RELFILE
-SHOW EXT
EXT ( 100 PAGES, 10 PAGES )
-ALTER RELFILE, PART ( 1, $VOL2 , 100, 10 )
-CREATE $VOL3.RELFILE
-ALTER RELFILE, PART ( 2, $VOL3, 100, 10 )