Obtaining Storage Type Property

An event type's storage type property specifies the how events of its type will be stored in the Broker's incoming event queue.

Storage Type	Description
AW_STORAGE_GUARANTEED	A two-phase commit process is used to store incoming events on the Broker. This offers the lowest performance, but very little risk of losing events if a hardware, software, or network failure occurs
AW_STORAGE_VOLATILE	Local memory is used to store incoming events on the Broker. This offers higher performance along with a greater risk of losing events if a hardware, software, or network failure occurs.

Use the awGetTypeDefStorageType function to obtain the storage type for an event type.

Client groups have two storage modes; guaranteed and volatile. A client group's storage mode represents the highest storage mode allowed for any events being put into the event queue of a client belonging to that group. With one exception, the Broker will put events into a client's queue using the lesser of the client group's storage mode and the event type's storage mode, as shown below.

If the Client Group Storage Mode is...	And the Event Type Storage Mode is...	Broker will put events into a client's queue using...
Volatile	Volatile	Volatile
Volatile	Guaranteed	Volatile
Guaranteed	Volatile	Volatile
Guaranteed	Guaranteed	Guaranteed