There are a number of utilities that can be executed outside of DB2. These are often referred to as standalone utilities or offline utilities.
When writing to an active log data set for the first time, DB2 must preformat a VSAM control area before writing the log records. The DSNJLOGF utility avoids this delay by preformatting the active log data sets before bringing them online to DB2.
The DSNJU003 standalone utility changes the bootstrap data sets (BSDSs). You can use the utility to:
Add or delete active or archive log data sets.
Add or delete checkpoint records.
Create a conditional restart control record to control the next start of the DB2 subsystem.