Same reason someone might want a reserve parachute.
If you consider the consequences of a failure are large then you don't rely on a single instance.
Having more than one node also means you can service higher volumes of concurrent queries.
Same reason someone might want a reserve parachute.
If you consider the consequences of a failure are large then you don't rely on a single instance.
Having more than one node also means you can service higher volumes of concurrent queries.
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