What are the data types in Redis?

What are the data types in Redis?

Redis supports 5 types of data types.

• Strings. Redis string is a sequence of bytes.
• Hashes. A Redis hash is a collection of key value pairs.
• Lists. Redis Lists are simply lists of strings, sorted by insertion order.
• Sets. Redis Sets are an unordered collection of strings.
• Sorted Sets.

What data is stored in Redis?

Redis data types include:

• Strings – text or binary data up to 512MB in size.
• Lists – a collection of Strings in the order they were added.
• Sets – an unordered collection of strings with the ability to intersect, union, and diff other Set types.
• Sorted Sets – Sets ordered by a value.

What is Redis dataset?

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

What can values be in Redis?

Redis Strings are binary safe, this means that a Redis string can contain any kind of data, for instance a JPEG image or a serialized Ruby object. A String value can be at max 512 Megabytes in length.

Where is data stored in Redis?

Try to look at KEYS command. KEYS * will list all keys stored in redis.

What are Redis keys?

Redis Keys are Ideal for Keeping Track of Lots of Strings. For the (simple string) key-value data type Redis allows you to set, get, delete, and increment arbitrary string pairs. You can only have 1 value at a time for each key (i.e. set is destructive assignment). You can also delete keys.

Is Redis transactional?

Redis scripting and transactions A Redis script is transactional by definition, so 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 transactional?

What is redis 5?

Redis 5.0 is the first version of Redis to introduce the new stream data type with consumer groups, sorted sets blocking pop operations, LFU/LRU info in RDB, Cluster manager inside redis-cli, active defragmentation V2, HyperLogLogs improvements and many other improvements. Redis 5 was release as GA in October 2018.

How is data 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 an acid?

Redis provides partial ACID compliance by design due to the fact that it is single threaded (which guarantees consistency and isolation), and full compliance if configured with appendfsync always , providing durability as well.