The EXTBKUP function of DBUTLTY reads a backup file and writes extract of backup format data to the output data set(s).
Important! Prior to the execution of the EXTBKUP function, one or more FILEOUT functions must have been specified. FILEOUT functions define which tables are to be extracted by the EXTBKUP function. See FILEOUT (Define Output Data Sets).
A backup file contains records for one or more tables, based upon the area or database content, and optional control statements provided to the backup utility. The EXTBKUP function can extract one or more tables from a backup file, as specified by the user. The function can also expand compressed data on the backup to a new backup file with no compressed records.
EXTBKUP with FORMAT=EXTRACT outputs data in expanded form. An extract file is not compressed and contains no CA Datacom control information, but backup files always contain control information and may or may not contain compressed data. Compressed data, if present, can be in the CA Datacom form or in a user compression form, such as the CA Datacom Presspack. EXTBKUP uses the control information on the backup file to know what tables exist, the row size, and compression options.
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