Interview Questions.

Question 1. What Is Redis?

Answer :

Redis is an open supply launched underneath BSD licensed, in-memory facts shape keep, it may be used as a database, cache and message broking.

Question 2. What Is Main Feature Of Redis?

Answer :

Data is being continual in-reminiscence as well as saved on disk that’s make Redis fast.
Redis supports simple grasp to slave replication.
Redis can execute 1, 00,000 queries in step with second.
Python Interview Questions
Question 3. What Is Advantages Of Using Redis?

Answer :

High pace
Server-side locking
Rich Client Side Library
Support Atomic Operation
Question four. List The Data Structures Supported By Redis?

Answer :

Redis helps following Data Structures:

Strings
Hashes
Lists
Sets
Sorted units with variety queries
Bitmaps
Hyperloglogs
Geospatial indexes with radius queries
Python Tutorial
Question 5. What Is Limitations Of Redis?

Answer :

Single threaded
It has were given restrained consumer guide for constant hashing
It has enormous overhead for patience
It isn't deployed extensively
RDBMS Interview Questions
Question 6. List Out The Operation Keys Of Redis?

Answer :

Operation keys of Redis consists of:

TYPE key
TTL key
KEYS sample
EXPIRE key seconds
EXPIREAT key timestamp
EXISTS key
DEL key
Question 7. How We Can Use Redis With .Internet Application?

Answer :

For use Redis in .Internet application need to observe given steps:

Download Redis Server
Install Redis Server
Download Redis Client
Set Configuration into Web.Config File
Use Redis Client Class
PHP Tutorial PHP Interview Questions
Question 8. What Is Redis-cli?

Answer :

Redis-cli is the Redis command line interface, a easy program that permits sending commands to Redis, and examine the replies despatched by means of the server, immediately from the terminal.

Question nine. Explain Repl?

Answer :

REPL stands for Read Eval Print Loop. It an interactive mode wherein the consumer kinds commands and get replies.

MySQL Interview Questions
Question 10. What The Basic Features Are Of Redis Which Makes It Awesome Compared To Memcache?

Answer :

Powerful information types and effective commands to leverage them. Hashes, Sorted Sets, Lists, and greater.
Persistence to disk, via default.
Transactions with positive locking (WATCH/MULTI/EXEC)
Pub/sub. Extremely speedy.
Values up to 512MB in size (memcached confined to 1MB consistent with key)
Lua scripting (as of two.6)
Extremely fast at everything. Benchmarks are frequently conflicting, however this a lot is apparent: whilst used like memcached Redis falls someplace between nearly as rapid or maybe even a bit quicker. Like memcached it's far frequently sure through available community or maybe reminiscence bandwidth in preference to CPU or different bottlenecks and will hardly ever be the perpetrator whilst your app is slowing down.
MySQL Tutorial
Question eleven. How Can You Use Redis With .Net Application?

Answer :

To use Redis in .Net programs, comply with these steps:

First, Download Redis Server.
Install Redis Server.
Download Redis Client.
Set Configuration into Web.Config File.
Use Redis Client Class.
PHP and Jquery Interview Questions
Question 12. We All Know That Reds Is Fast, But Is It Also Durable?

Answer :

No. Redis compromises with sturdiness to beautify the speed. In Redis, inside the case of device failure or crash, it writes to disk however may additionally fall at the back of and lose the facts which isn't stored.

Python Interview Questions
Question thirteen. What Are The Main Features Of Redis?

Answer :

Following are the main capabilities of Redis:

Redis is very simple to install setup and manipulate.
Redis could be very fast. It can execute a hundred thousand queries per 2nd.
Redis is speedy due to the fact facts is being continual in memory as well as saved at the disk.
Redis operations running on specific statistics sorts are atomic so those operations can be completed thoroughly i.E. To set or increase
a key, upload or eliminate elements from a fixed or increase a counter.
Redis supports a spread of languages i.E. C, C++, C#, Ruby, Python, Twisted Python, PHP, Erlang, Tcl, Perl, Lua, Java, Scala and so on.
If your preferred language is not supported yet, you can write your very own customer library, because the Protocol is quite simple.
Redis helps simple master to slave replication.
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Question 14. In Which Language Redis Is Written?

Answer :

Redis is written in ANSI C and by and large used for cache answer and session management. It creates particular keys for store values.

Question 15. What Are The Things You Must Have To Take Care While Using Redis?

Answer :

While the use of Redis, you have to have to take care of following commands:

Select a regular technique to call and prefix your keys. Manage your namespace.
Create a “Registry” of key prefixes that maps every of your internal documents for those programs which “personal” them.
For each class you positioned thru into your Redis infrastructure: layout, enforce and test the mechanisms for garbage collection or information migration to archival garage.
Design, put into effect and test a sharding library before you have got invested a lot into your application deployment and make certain that you keep a registry of “shards” replicated on every server.
Separate all your K/V keep and associated operations into your own library/API or provider.
PostgreSQL Interview Questions
Question sixteen. What Is The Difference Between Overriding A Value By Using Set Vs Append?

Answer :

A cost set by the usage of SET command will set the fee for the important thing.Doing it another time will override the price. However , the usage of append has the impact of set only when the important thing has no cost in advance, however if there is a price already assigned to the important thing , then doing append on the key could result in an appended fee to the present fee of the important thing.

Django Tutorial
Question 17. What Do You Mean By Data Modeling In Redis?

Answer :

Just like some other database, statistics modeling represents the storage sample of ways and which facts systems are used to shop the statistics to achieve a domain requirement. For instance in relational database international, we use number one key to set up a relationship between two entities. Data saved in relational databases are in table format, wherein as in Redis there are set of information structures available, which might be used to represent the area data. There is virtually exceptional layout mindset needed to convert the relational statistics to a Redis dataset.

Master Data Management Interview Questions
Question 18. Why Redis Is Different As Compared To Other Key-price Stores?

Answer :

Redis values can incorporate extra complicated records types, with atomic operations.
Redis is an in-reminiscence but chronic on disk database.
RDBMS Interview Questions
Question 19. How Do I Move A Redis Database From One Server To Another?

Answer :

use BGSAVE command to Save a spanshot of the database right into a dump.Rdb
Copy this dump.Rdb file into every other server.
Git (software) Tutorial
Question 20. How To Re-start Redis?

Answer :

You can restart Redis via the use of following path:

/and many others/init.D/redis-server restart

Aerospace Interview Questions
Question 21. How To Start Redis?

Answer :

You can start Redis with the aid of using following path:

/etc/init.D/redis-server start

Question 22. How To Stop Redis?

Answer :

You can forestall Redis through the use of following route:
/and many others/init.D/redis-server stop

Javascript Advanced Tutorial
Question 23. How To Get All Keys From Redis?

Answer :

Use the subsequent commands:

$keyList = $redis->keys("*");

print_r($keyList);

/*Array ( [0] => tutorials [1] => call ) */

MYSQL DBA Interview Questions
Question 24. How To Get Array Data From Redis?

Answer :

To get the array statistics from Redis use the subsequent command :

$list = $redis->lrange("tutorials", zero ,five);   
print_r($listing);
/*Array ( [0] => Mysql [1] => Mongodb [2] => Redis [3] => MySQL [4] => PHP [5] => Mysql ) */

PHP Interview Questions
Question 25. How To Set Multiple Values (array) In Redis?

Answer :

To set multiple values in Redis use the following commands:

$redis->lpush("tutorials", "PHP");
$redis->lpush("tutorials", "MySQL");
$redis->lpush("tutorials", "Redis");
$redis->lpush("tutorials", "Mongodb");
$redis->lpush("tutorials", "Mysql");

Cucumber Tutorial
Question 26. How To Get Value From Redis?

Answer :

To get cost from Redis :

echo $redis->get('call'); //Set string in redis

Ruby Interview Questions
Question 27. How To Set Value In Redis?

Answer :

To set the cost in Redis use the subsequent command:

$redis->set("call", "Set string in redis");

MySQL Interview Questions
Question 28. How To Check Redis Is Running?

Answer :

To check Redis is jogging strive out the subsequent code :

try

    $redis = new Redis();
    $redis->connect('127.Zero.Zero.1', 6379);
    echo "Redis is jogging.";
    echo "Server is running: " . $redis->ping();

catch (Exception $e)

    echo $e->getMessage();

Question 29. How To Remove All Database?

Answer :

To cast off all database use the subsequent code:

redis-cli flushall

Django Interview Questions
Question 30. How To Delete Current Database?

Answer :

To delete modern database use the subsequent code:

redis-cli flushdb

Question 31. What Do You Mean By "redis Is Binary Safe"?

Answer :

Binary safe manner that it has a known duration however not confined by using any unique individual. You can keep any value upto the given length. A string value may be 512 MB in period.

Question 32. How Does Redis Differ From Mongodb? Is There A Use Case When For Redis If Using Mongodb?

Answer :

MongoDB is an unstructured (at least, in definition) allotted file garage. For clearing reason you may reflect onconsideration on it as a high scalable and not so high performance JSON storage (although genuinely it makes use of BSON). It has a easy however effective multitype index system, replication and sharding, and quite a few extra first-rate capabilities.

Redis is a simplest key/cost keep, with temporary statistics caching. It can works as an efficient queue device.

Looking for greater unique data you'll locate a whole lot of eventualities in which both them are used, Mongo as a real chronic canonical garage, and Redis as an transient/cache storage.

Git (software program) Interview Questions