When databases are created, online extensibility for all realms for which a secondary assignment > 0 was specified for storage space allocation is activated automatically by the utility routines BCREATE and BFORMAT.
Activation of online extensibility therefore applies for all newly created realms with a secondary assignment > 0 from the outset and does not have to be set using the relevant DAL commands. However, you can suppress the activation of online extensibility by defining a secondary assignment = 0 for the realm. Changing the secondary allocation after the utility routines BCREATE and BFORMAT have been executed does not automatically result in the activation of the online extensibility.
If online realm extension is activated in this manner, the default values nr-pages=64 and min-pages=0 are entered for nr-pages and min-pages (see section “Activating online extensibility for a realm (ACT INCR)” in chapter "Activating online extensibility (ACT)").
Online DBTT extension is also activated during database creation for all DBTTs which are located in realms for which online extensibility was activated in this manner. The default value SCAN=YES is used for the SCAN parameter here (see section “Activating online DBTT extensibility for a record type (ACT DBTT-INCR)” in chapter "Activating online extensibility when creating databases").
Subsequent modification of the settings (in particular deactivation) for both online realm extension and online DBTT extension using the DAL command is possible.
Irrespective of the online extensibility of a realm, the DAL command EXTEND REALM can be used to note a one-off realm extension which will be performed when the next free space search takes place in the realm.