YugabyteDB provides default memory configuration values that should be evaluated for specific use cases and workloads. The three main buckets of memory utilization are the tserver process, the master process, and the postgres process. The tserver process is configured to use up to 85% of available RAM, while the master process uses 10%. Tuning memory settings requires observing memory utilization through YugabyteDB's observability windows and sizing memory correctly for each process. A starting rule of thumb is to set the tserver default_memory_limit_to_ram_ratio to 50% of total available RAM, but this should be adjusted based on actual memory usage. The block cache, memtables, log cache, read buffers, master process, and ysql processes all require tuning to optimize memory utilization. Increasing available memory for critical processes like tserver and master can improve performance, while leaving too little memory can lead to out-of-memory events.