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Suppose a long-running analytical query is executing on a database server and has been allocated a large amount of physical memory. A high-priority task comes in and people need to run it immediately with all available resources. The authors have several choices. They could swap out the old query to disk, but writing out a large execution state may take too much time. Another option is to terminate the old query and restart it after the new task completes, but they will waste all the work already performed by the old query. Yet another alternative is to periodically checkpoint the query during execution, but traditional synchronous checkpointing carries high overhead.
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