The BACKUP Data Area option of DBUTLTY reads the specified area (or all areas of a database for a "base-level backup") and writes a sequential output data set. A backup can also be made of a data area that either INCLUDEs or EXCLUDEs specific tables. The output data set record format is variable blocked.
Note: Since a MRDF-supported virtual area exists only in the MUF memory, you cannot perform a backup of the data without MULTUSE=YES. If you execute the backup of a virtual table without MULTUSE=YES, the backup accesses the disk area either unloading no records or unloading any records as they existed in the area before it became virtual. You can perform a backup of a covered area since CA Datacom/DB writes to both the area in memory and the DASD copy.
In Simplify mode, the function requires MUF to be enabled. This provides control and protection. If MUF is not enabled, this function should wait for MUF to enable. If you are required to execute the function without MUF enabled, for example when you need to allow restart to execute, the function has to be made to follow a function that can only run with MUF not enabled, or it must follow a function to acknowledge MUF is not enabled with SET OPTION1=MUF_NOT_ENABLED. It is possible (but not recommended) to use SET OPTION1=MUF_ENABLED_OR_DISABLED.
A BACKUP without MULTUSE=YES and without SEQ=PHYSICAL requires the database to be closed. If the database is open with no users, it is automatically closed. A BACKUP with SEQ=PHYSICAL automatically causes a COMM STATS to the database before execution, to record current statistics and control information to the CXX and data area control block. It also forces the pipeline of write pendings for the data area.
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