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Messaging Flashcards

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  1. Which TIBCO EMS configuration property controls the maximum number of messages that can be held in a queue before new messages are rejected?

    Answer: max.msgs

    The 'max.msgs' property sets the maximum message count for a queue or topic; when reached, new messages are handled per the overflow policy.

  2. What is TIBCO EMS 'message bridging' used for?

    Answer: Forwarding messages from one destination to another, even across different EMS servers

    Message bridging routes messages from a source destination to one or more target destinations, enabling cross-server or cross-destination flows.

  3. In TIBCO Rendezvous, what transport type uses multicast UDP for efficient one-to-many message delivery?

    Answer: PGM (Pragmatic General Multicast) transport

    TIBCO RV supports PGM multicast transport for high-throughput, low-latency one-to-many scenarios with optional reliability.

  4. When TIBCO EMS is deployed in a fault-tolerant (FT) pair, which server handles client connections during normal operation?

    Answer: The primary (active) server handles all connections; the secondary is standby

    In FT mode, the primary (active) server handles all client connections while the secondary (standby) replicates state and waits for failover.

  5. What is the purpose of 'message selectors' in TIBCO EMS when used with topics?

    Answer: They allow subscribers to receive only messages whose header properties match a SQL-92 expression

    Message selectors filter topic messages on the broker using SQL-92 expressions against message properties, reducing unnecessary network delivery.

  6. Which TIBCO FTL concept allows an application to define named sets of message fields for efficient encoding?

    Answer: Format definitions

    FTL format definitions pre-declare message field names and types, enabling compact wire encoding and faster processing.

  7. In a TIBCO EMS session configured as SESSION_TRANSACTED, when are messages actually sent to the server?

    Answer: When the session's commit() method is called

    In a transacted session, produced and consumed messages are batched locally and only applied on the broker when commit() is called; rollback() cancels them.

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