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    <p>Another possibility is to have a queue of tasks somewhere, and when applications that otherwise use the database perform some operation, they also do some tasks out of the queue. Wikipedia does something like this with its job queue. The scheduling isn't as certain as with the other methods, but you can e.g. put off doing housekeeping work when your server happens to be heavily loaded.</p> <p>Edit: It's not necessarily better or worse than the other techniques. It's suitable for tasks that do not have to be performed by any specific deadline, but should be done "every now and then", or "soon, but not necessarily right now".</p> <p><strong>Advantages</strong></p> <ul> <li>You don't need to write a separate application or set up SQL Server Agent.</li> <li>You can use any criteria you can program to decide whether to run a task or not: immediately, once a certain time has passed, or only if the server is not under heavy load.</li> <li>If the scheduled tasks are ones like optimising indices, then you can do them less frequently when they are less necessary (e.g. when updates are rare), and more frequently when updates are common.</li> </ul> <p><strong>Disadvantages</strong></p> <ul> <li>You might need to modify multiple applications to cooperate correctly.</li> <li>You need to ensure that the queue doesn't build up too much.</li> <li>You can't reliably ensure that a task runs before a certain time.</li> <li>You might have long periods where you get no requests (e.g. at night) where deferred/scheduled tasks could get done, but don't. You could combine it with one of the other ideas, having a special program that just does the jobs in the queue, but you could just not bother with the queue at all.</li> </ul>
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    1. POScheduled execution of code to conduct database operations in SQL Server
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    1. CODoug, that's another possibility, but can you say how it would be better than the others?
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      1. USJohn Saunders
    2. COThanks, Doug: +1
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      1. USJohn Saunders
    3. COI'd recommend you avoid reinventing the wheel when SQL ships with queued based, activation launched processing that supports timers since 2K5...
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      1. USRemus Rusanu
 

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