Messaging Flashcards

In TIBCO EMS, what happens to messages sent to a queue when no consumer is connected?

Answer: Messages are stored until a consumer connects and retrieves them

TIBCO EMS queues store messages persistently until a consumer connects and retrieves them, ensuring no data loss.

Which TIBCO EMS acknowledgment mode requires the client to explicitly call acknowledge() on received messages?

Answer: CLIENT_ACKNOWLEDGE

CLIENT_ACKNOWLEDGE mode requires the application to call message.acknowledge() explicitly to confirm receipt.

What is the role of a 'durable subscriber' in TIBCO EMS topic messaging?

Answer: It retains a subscription so messages are stored even when the subscriber is offline

A durable subscriber registers a named subscription so the server stores messages published while it is disconnected.

In TIBCO Rendezvous, what transport mechanism does RVRD (Rendezvous Routing Daemon) provide?

Answer: Wide-area routing of messages between local networks

RVRD enables WAN (wide-area) routing by forwarding messages between separate local network segments.

Which TIBCO EMS feature allows a consumer to receive only messages matching a specific criteria without filtering on the client side?

Answer: Message selectors

Message selectors use SQL-92 syntax applied on the broker side to deliver only matching messages to a consumer.

In TIBCO FTL, what distinguishes a 'dynamic data content' message from a standard message?

Answer: It carries a self-describing schema so receivers can interpret fields without prior knowledge

FTL dynamic data content messages embed field metadata, allowing receivers to decode fields without pre-shared schema definitions.

When configuring TIBCO EMS for high availability, what is the purpose of the 'store' file?

Answer: It persists messages and subscription state to disk for recovery after a broker restart

The EMS store file (typically .db or .dat format) persists messages and durable subscriptions so they survive broker crashes or restarts.