About multistreaming and DB2 snapshot backups
To shorten the length of time to backup a snapshot of the DB2 database, the operation may perform multiple, concurrent, job streams in parallel. To configure, use either the -s option on the bpdb2proxy command or the sessions parameter in the Backup Options screen of the backup wizard. When more than one stream is used, NetBackup sorts the files by size and create equal sized groups, one for each stream to process.