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Is there any safe way to use ephemeral storage (deleted on halt) for postgresql cluster?

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    Yes. Don't halt the VM. – mustaccio Aug 22 '18 at 19:29
  • or only store data that's not important in the cluster – Jasen Aug 24 '18 at 6:04
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Use it for system swap space. Swapping doesn't hurt performance, running out of memory hurts performance. swapping is just a symptom.

You could also try putting unlogged temporary tables there but I'm not sure what would happen when they disappear.

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