Redis (Basics)

#Redis (Basics)

Redis is an open source, advanced key-value store. It is often referred to as a data structure server since keys can contain strings, hashes, lists, sets and sorted sets. Redis is written in C.

Redis has three main peculiarities that set it apart from much of its competition:

• Redis holds its database entirely in memory, using the disk only for persistence.
• Redis has a relatively rich set of data types when compared to many keyvalue data stores.
• Redis can replicate data to any number of slaves.

Redis transactions allow the execution of a group of commands in a single step. Transactions has two properties in it, which are described below:

• All commands in a transaction are sequentially executed as a single isolated operation. It is not possible that a request issued by another client is served in the middle of the execution of a Redis transaction.
• Redis transaction is also atomic. Atomic means either all of the commands or none are processed.

Partitioning is the process of splitting your data into multiple Redis instances, so that every instance will only contain a subset of your keys.

• set name gaurav
• get name
• mset tmp abc tmp1 bcd
• mget tmp tmp1
• del name
• exists name
• keys *
• keys *name
• expire name 2
• ttl name
• strlen name
• incr num
• append name chandak
• hset gc name gaurav
• hget gc name
• hmset gc name gaurav surname chandak
• hgetall gc
• hkeys gc
• hvals gc
• hlen gc
• hexists gc name
• lpush list1 gaurav
• rpush list1 chandak
• lrange list1 2 10
• llen list1
• lpop list1
• rpop list1
• lindex list1 1
• lrem list1 -2 "gaurav"
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