TIBCO Messaging 2 — Questions and Answers
Question 1: In TIBCO EMS, what happens to messages sent to a queue when no consumer is connected?
- Messages are discarded immediately
- Messages are stored until a consumer connects and retrieves them (Correct answer)
- Messages are broadcast to all topics
- Messages are returned to the sender with an error
Correct 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.
Question 2: Which TIBCO EMS acknowledgment mode requires the client to explicitly call acknowledge() on received messages?
- AUTO_ACKNOWLEDGE
- CLIENT_ACKNOWLEDGE (Correct answer)
- DUPS_OK_ACKNOWLEDGE
- SESSION_TRANSACTED
Correct answer: CLIENT_ACKNOWLEDGE
CLIENT_ACKNOWLEDGE mode requires the application to call message.acknowledge() explicitly to confirm receipt.
Question 3: What is the role of a 'durable subscriber' in TIBCO EMS topic messaging?
- It consumes messages faster than non-durable subscribers
- It retains a subscription so messages are stored even when the subscriber is offline (Correct answer)
- It broadcasts messages to multiple queues simultaneously
- It acknowledges all messages automatically without reading them
Correct 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.
Question 4: In TIBCO Rendezvous, what transport mechanism does RVRD (Rendezvous Routing Daemon) provide?
- Point-to-point TCP connections only
- Wide-area routing of messages between local networks (Correct answer)
- REST-based message delivery
- SOAP envelope wrapping for messages
Correct answer: Wide-area routing of messages between local networks
RVRD enables WAN (wide-area) routing by forwarding messages between separate local network segments.
Question 5: Which TIBCO EMS feature allows a consumer to receive only messages matching a specific criteria without filtering on the client side?
- Message selectors (Correct answer)
- Message priorities
- Dead letter queues
- Delivery modes
Correct answer: Message selectors
Message selectors use SQL-92 syntax applied on the broker side to deliver only matching messages to a consumer.
Question 6: In TIBCO FTL, what distinguishes a 'dynamic data content' message from a standard message?
- It uses XML encoding exclusively
- It carries a self-describing schema so receivers can interpret fields without prior knowledge (Correct answer)
- It delivers only to queues, not endpoints
- It bypasses persistence and is always transient
Correct 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.
Question 7: When configuring TIBCO EMS for high availability, what is the purpose of the 'store' file?
- It holds client connection credentials only
- It persists messages and subscription state to disk for recovery after a broker restart (Correct answer)
- It acts as a load balancer between multiple EMS servers
- It stores SSL certificates for secure connections
Correct 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.
TIBCO Messaging 2
In TIBCO EMS, what happens to messages sent to a queue when no consumer is connected?