Redis

Redis is an in-memory data structure store, used as a distributed, in-memory key–value database, cache and message broker, with optional durability. Redis supports different kinds of abstract data structures, such as strings, lists, maps, sets, sorted sets, HyperLogLogs, bitmaps, streams, and spatial indices.

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. Redis has built-in replication, Lua scripting, LRU eviction, transactions, and different levels of on-disk persistence, and provides high availability via Redis Sentinel and automatic partitioning with Redis Cluster Read More

Redis Data types

1. String
2. List
3. Set
4. sored Set
5. Hash

Storing Strings in Redis: Insertion and Retrieval Commands

1. SET Command

SET key value

2. GET Command

GET key

3. SETEX Command

SETEX key seconds value

4. PSETEX command

PSETEX key milliseconds value

5. SETNX Command

SETNX key value ## command is used if a key is already present, and not update the value

6. STRLEN Command

STRLEN key ## Get the value length of a key

7. MSET Command

MSET key1 value key2 value ## set multiple keys values

8. MGET Command

MGET key1 key2 ## Get multiple values of keys

Storing Strings in Redis: Utility Commands

1. KETS This get all keys on the database

KEYS *

2. INCR This increment value of key by one, but the value must be a number, if other it will retunr (error) ERR value is not an integer or out of range.

INCR key

3. INCRBY The same as INCR but increase by specific count.

INCRBY key count

4. INCRBYFLOAT The same as INCR but increase by specific float number.

INCRBYFLOAT key floatValue

5. DECR This for decrease value by one, it must be a number

DECR key

6. DECRBY The same as DECR, but decrease by specific count

DECRBY key count

7. DEL This for deleting key from database

DEL key

8. FLUSHALL This for deleting all keys from database

FLUSHALL

9. APPEND This for appending string to key

APPEND key valueToBeAppended