Redis is 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 indexes.
Redis stands for REmote DIctionary Server.
The main operation keys of Redis are given below-
Redis uses non-blocking asynchronous replication, with asynchronous replica-to-master acknowledges of the amount of data processed. A master can have multiple replicas. It ensures that the master will continue to handle queries when one or more replicas perform the initial synchronization or a partial resynchronization. Replication is also largely non-blocking on the replica side.
The given path can be followed to start Redis-
/etc/init.d/redis-server start
The given path can be followed to re-start Redis-
/etc/init.d/redis-server restart
The given path can be followed to stop Redis-
/etc/init.d/redis-server stop
Binary Safe represents having a known length, but no special character limits it. Any value can be stored by the user up to the given size. A string value can have a length of 512 MB.
Redis supports following Data Structures:
For use Redis in .net application need to follow given steps:
Redis |
RDBMS |
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Redis stores everything in primary memory. |
RDBMS stores everything in secondary memory. |
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In Redis, it stores data in primary memory because of that Read and Write operations are extremely fast. |
In RDBMS, it stores data in secondary memory and because of that Read and Write operations are slow. |
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Since primary memory is smaller and more costly than secondary memory, Redis is unable to store large files or binary data. |
Since secondary memory is larger and less expensive than primary memory, RDBMS can easily handle these types of files and data. |
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Redis is only used to store small quantities of textual data that must be accessed, updated, and added quickly. You'll get errors if you try to write bulk data that exceeds the available memory. |
RDBMS can store large amounts of data that aren't used regularly and aren't needed to be fast. |
According to the redis official docs, the maximum size of key in redis is 512MB.
Redis provide 5 types of data types. Strings, Hashes, Lists, Sets, Sorted Sets.
Redis uses non-blocking asynchronous replication, with asynchronous replica-to-master acknowledges of the amount of data processed. A master can have multiple replicas. It ensures that the master will continue to handle queries when one or more replicas perform the initial synchronization or a partial resynchronization. Replication is also largely non-blocking on the replica side.
The list operations are given below-
ZSET means a Redis Sorted Set where we can document a Redis data type. Each key in the assorted set contains multiple values associated with a value score that is floating. Redis provides the unique feature of accessing it by a member such as a HASH. Also, we can access the items by the sorted order as well as the values of the scores.
We can get the array data from Redis by using the given commands
$list = $redis ->lrange (“tutorials”, 0, 5);
print_r($list);
/*array ([0] => Mysql [1] => Mongodb [2] => Redis [3] => MySQL [4]=> PHP [5] => Mysql)*/
try
{
$redis = new Redis();
$redis -> connect (‘127.0.0.1’, 6379);
echo “Redis is running.”;
echo “Server is running:”. $redis -> ping()
}
catch (Exception $e)
{
echo $e -> getMessage();
}
EXEC, MULTI, WATCH, and DISCARD are the foundations of Redis transactions. A group of commands can be executed in a single step by these. And the following two important guarantees are there-
The following languages are supported by Redis-
Redis is an open-source, NoSQL, and in-memory data structure store. The principle of a key-value store is followed by Redis.
It is very persistent, fast, portable, and supports several languages like Java, Python, C, C++, R, Scala, Lua, JavaScript, Ruby, Rust, Tcl, Go, etc.
ANSI C is the language in which Redis is written. It is mostly used for session management and cache solution. And unique keys are created by it for store values.