Database / RocksDB Basics Interview Questions
What is the purpose of the Put operation in RocksDB?
Put is the core write operation in RocksDB, used to insert a new key-value pair or overwrite the value of an existing key.
- Writes go to both the active MemTable in memory and the write-ahead log on disk
- If the key already exists, its previous value is logically superseded by the new one, though the old value may still physically remain in older SSTables until compaction removes it
- Considered committed once it's durably recorded in the write-ahead log, unless WAL writes have been explicitly disabled
Put is the fundamental building block nearly every other higher-level operation in an application built on RocksDB ultimately relies on.
What does Put do to an existing key's value?
Where does a Put operation write to?
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