Database / RocksDB Basics Interview Questions
What are the Compaction Styles supported by RocksDB?
RocksDB supports a few different strategies for how it merges SSTables together over time.
| Style | Description |
| Leveled compaction | Organizes SSTables into levels of increasing size, merging and pushing data down to lower levels over time |
| Universal compaction | Keeps SSTables sorted by recency and periodically merges them all together, favoring write throughput over read efficiency |
| FIFO compaction | Simply drops the oldest SSTables once a size limit is reached, with no merging at all |
Leveled compaction is RocksDB's default and most commonly used style, generally offering the best balance of read performance and space efficiency for most workloads.
Which compaction style is RocksDB's default?
Which compaction style simply drops the oldest SSTables with no merging?
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