Messaging Flashcards

What does TIBCO EMS 'connection factory' configuration allow administrators to define?

Answer: Pre-configured connection settings (server URL, SSL, reconnect) that clients look up by name

Connection factories are JNDI-accessible objects that encapsulate server URL, reconnection behavior, and SSL settings, simplifying client configuration.

In TIBCO Rendezvous, what is a 'subject name' and what wildcard character represents a single element?

Answer: A topic path where '*' matches a single element

RV subject names use dot-separated hierarchical elements; '*' matches exactly one element and '>' matches one or more trailing elements.

Which TIBCO EMS feature prevents a producer from overwhelming a slow consumer by pausing message production?

Answer: Flow control

EMS flow control signals producers to slow down or pause when destinations approach capacity limits, preventing memory exhaustion.

What is the difference between a TIBCO EMS 'static' route and a 'dynamic' route?

Answer: Static routes are configured in tibemsd.conf at startup; dynamic routes are created at runtime via the API

Static routes are defined in configuration files and loaded at server startup, while dynamic routes are created programmatically at runtime.

In TIBCO EMS, what is the purpose of setting a 'redelivery delay' on a queue?

Answer: It introduces a wait period before a negatively-acknowledged message is redelivered

Redelivery delay adds a configurable pause between failed delivery attempts, preventing rapid retry storms that could overload consumers.

Which TIBCO EMS administrative command-line tool is used to manage topics, queues, and connections on a running server?

Answer: tibemsadmin

tibemsadmin is the interactive command-line administrative client for TIBCO EMS, allowing real-time management of destinations, connections, and server properties.

What happens in TIBCO EMS when a message's redelivery count exceeds the queue's configured 'redelivery.limit'?

Answer: The message is moved to the Dead Message Queue (DMQ)

When redelivery attempts exceed the configured limit, EMS moves the undeliverable message to the DMQ for inspection and potential manual reprocessing.