What is stored in dbcache and with what priority?

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Wanting to reduce the wear and tear on my storage and also speed up the initial sync, I increased dbcache to 12000. That size slightly higher than the size of chainstate/ (≈11 GB). I have 64GB of memory, my non-mining node is run ≈10% of the time with maxmempool=30 datacarrier=0 permitbaremultisig=0 and prune=16384. Given those parameters, what else is stored my database cache? Is data corresponding to blocks/ stored there as well (if so how much?)? I want to store the UTXO set in memory but not the old blocks.