A Redis string is one binary-safe byte sequence attached to a key. It can hold text, a serialized document, or a decimal counter. This is a public data type, not a claim that every Redis structure is implemented by assembling strings. Hashes, lists, and other types have their own commands, representations, and update rules. ...
Pipelining lets a client send several Redis commands without waiting for each reply before sending the next. It reduces request-response waiting and can amortize socket I/O overhead. Redis still executes the commands and produces their replies; batching is neither a promise of parallel execution nor a transaction boundary. ...
Sentinel has two gates: schematic.
Redis Sentinel supervises a non-Cluster primary/replica deployment and publishes the current primary’s address. It does not store the application’s dataset or proxy its commands. Automatic promotion can restore write availability after a primary fails, but discovery, replica freshness, client reconnection, and protection from stale writers remain separate parts of the system. ...