Can Redis be used for synchronization?

The SYNC command is called by Redis replicas for initiating a replication stream from the master. It has been replaced in newer versions of Redis by PSYNC .

Is Redis a structured database?

Redis is not a plain key-value store, it is actually a data structures server, supporting different kinds of values.

Is Redis cluster consistent?

Redis Cluster does not guarantee strong consistency. In practical terms this means that under certain conditions it is possible that Redis Cluster will lose writes that were acknowledged by the system to the client. The first reason why Redis Cluster can lose writes is because it uses asynchronous replication.

What is the structure of Redis?

1.2 What Redis data structures look like

Is Redis transactional?

Something else to consider for transaction like operations in redis are redis scripts which are transactional. Everything you can do with a Redis Transaction, you can also do with a script, and usually the script will be both simpler and faster.

Is Redis single thread?

Redis is, mostly, a single-threaded server from the POV of commands execution (actually modern versions of Redis use threads for different things). It is not designed to benefit from multiple CPU cores. People are supposed to launch several Redis instances to scale out on several cores if needed.

Is Redis a relational database?

1.1. Redis is a type of database that’s commonly referred to as No SQL or non-relational .

What data structure does Redis support?

Redis is an open source (BSD licensed), in-memory data structure store, used as a database, cache and message broker. It supports data structures such as strings, hashes, lists, sets, sorted sets with range queries, bitmaps, hyperloglogs and geospatial indexes with radius queries.

How the data is stored in Redis?

Since Redis is an in-memory database, data is stored in memory (or RAM). If a server crashes, all the data stored is lost. Redis has back-up mechanisms in place for the data on the disk. This way, the data is loaded from the disk to the memory when the server reboots.

Is Redis pipeline Atomic?

Atomicity of pipelining Also, that all commands in Redis are atomic, executed individually. This means that Redis doesn’t stop any command half-way through its execution to execute another command. Every individual command that is started is finished without interleaving with other commands.

Is Redis parallel?

The idea is simple. While Redis still remains single threaded, a module can run many threads. Any one of these threads can acquire the Global Lock when it needs to access Redis data, operate on it, and release it. We still cannot really query Redis in parallel.