Microsoft Azure Developer Associate AZ-204 Practice Question
You use a C# timer-triggered Azure Function with the CRON expression '0 0 */4 * * *' so it runs every four hours. The function must also execute once immediately when the function app starts. Which configuration change accomplishes this?
Set useMonitor to false for the timer extension in host.json.
Add the parameter RunOnStartup = true to the TimerTrigger attribute.
Enable the AlwaysOn setting on the Function App in Azure portal.
Create an application setting named WEBSITE_TIME_TRIGGER with the value Startup.
The TimerTrigger attribute supports an optional RunOnStartup property. When set to true, the runtime executes the function once when the host starts and then continues following the defined schedule. AlwaysOn only keeps the Function App warm but does not invoke the function, useMonitor controls checkpointing and does not affect startup execution, and no WEBSITE_TIME_TRIGGER app setting exists. Therefore adding RunOnStartup = true to the TimerTrigger attribute is the correct approach.
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What is a TimerTrigger in Azure Functions?
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What is a CRON Expression and how does it work in Azure?
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What does RunOnStartup = true do in a TimerTrigger?
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Microsoft Azure Developer Associate AZ-204
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