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You sort-of can do that with Postgres.

The "nice" option is to tune "fsync", "synchronous_commit" and "wal_sync_method" in postgresql.conf

If your overall write load is low enough that you will catch up over reasonable amounts of time, the really dirty method is to set up replication (internally on a single server if you like) and put the master on a ram disk. If your server crashes, just copy the slaves data directory and remove the recovery.conf file, and you'll lose only whatever hadn't been replicated.

But in terms of time investment in solving this, it's likely going to be cheaper to just stick an SSD in there.




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