Running maintenance does not stop polling, alerting, etc.. In other words, no down time is incurred as a result of running database maintenance. You may find the Orion web interface a little sluggish while database maintenance is occurring which is one of the reasons it runs at 2:15am, but the extent of the web performance degradation will depend on the speed, size, and architecture of your SQL database server. In my small lab environment I can't even tell that database maintenance is running, but in larger environments with numerous additional pollers and dozens of users accessing the Orion web interface, maintenance running simultaneously can have a more noticeable effect.
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