# Generic commands > Commands for managing keys, expiration, serialization, and database-wide key operations. Copy a key to another key Delete one or more keys Serialize a key's value Check if keys exist Set a key's TTL in seconds Set expiry as Unix timestamp Get expiry as Unix timestamp Find keys matching a pattern Estimate memory used by a key Remove the expiration from a key Set a key's TTL in milliseconds Set expiry as Unix ms timestamp Get expiry as Unix ms timestamp Get TTL in milliseconds Return a random key Rename a key Rename a key if new key doesn't exist Deserialize and restore a key Incrementally iterate keys Update last access time of keys Get TTL in seconds Get the type of a key Delete keys asynchronously Wait for replica acknowledgements Wait for local and replica persistence