Online
    Noonline

    Allows or disallows users and applications to be on line
    (actively attached) to the standby database.

    Applicable to:              Standby database
    Required or Optional:       Optional
    Default Value:              Noonline

    Online database access means that database users and applications
    can be actively attached (and perform read-only transactions)
    to the standby database before, during, and after replication
    operations.

    The default setting (Noonline) disallows applications and
    users from attaching to the standby database during replication
    operations. However, if the standby database is open on another
    node (thus, an ALS process is active on that node), the LRS
    process cannot start replication on the standby database and
    the error message STBYDBINUSE is returned.

                                   NOTE

       If record caching is enabled on the standby database, the
       Hot Standby software assumes the Online setting. Specifying
       the Noonline qualifier on the Replicate After_Journal Start
       command has no effect. Because record caching requires
       the record cache server to be an online server, you cannot
       override the Online setting.

    Because the Replicate After_Journal Start command fails if you
    enter it on a standby node where read/write transactions are in
    progress (including prestarted read/write transactions), Oracle
    Corporation recommends that you choose the Noonline (default)
    setting.

    The Online and Noonline qualifiers do not affect access to the
    master database.