Optimize After_Journal
    Optimizes a backed up after-image journal (.aij) file for
    database recovery (rollforward) operations by eliminating
    unneeded and duplicate journal records, and by ordering
    journal records. An optimized .aij (.oaij) file created by the
    RMU Optimize After_Journal command provides better recovery
    performance for your database than an .aij file. A benefit of
    this improved recovery performance is that the database is made
    available to users sooner.

    The RMU Optimize After_Journal command is used to read a backed
    up .aij file on disk and write the .oaij file to tape or disk.