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Introduction to Redis
course content

Kursusindhold

Introduction to Redis

Introduction to Redis

1. Redis Fundamentals
What is Redis?Uses of RedisInstalling Redis on WindowsInstalling Redis on MacOSConnecting to and Starting Redis
2. The Essential Redis Commands
SET CommandGET CommandEXISTS CommandChallenge: Basic CommandsINCR and DECR CommandsChallenge: INCR and DECRData Deletion
3. Data Types in Redis
StringListChallenge: Task Management SystemSetChallenge: Managing User InterestsSorted SetHash TableChallenge: Managing User Profiles
4. Advanced Features and Security
Managing Key ExpirationTransactionsPubSubSecurityRDB PersistenceAOF Persistence
5. Caching with Redis and Spring Boot
Introduction to CachingIntegration with Spring BootAnnotations for Working with CachePractical Use of Hashes

book
EXISTS Command

EXISTS Command

If you simply need to check whether a key exists in Redis without retrieving its value, you can use the EXISTS command.

Example Usage

If you provide a single key, the result will be 1 if the key exists, or 0 if it does not.

In this case, the result will be 1 since the key mykey exists.

When multiple keys are specified, the command will return the number of keys that exist in Redis. If we also have keys key1 and key3 in the database, this query will return 2, since only key1 and key3 exist in the database.

question mark

What will the EXISTS command return when checking multiple keys?

Select the correct answer

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Sektion 2. Kapitel 3

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course content

Kursusindhold

Introduction to Redis

Introduction to Redis

1. Redis Fundamentals
What is Redis?Uses of RedisInstalling Redis on WindowsInstalling Redis on MacOSConnecting to and Starting Redis
2. The Essential Redis Commands
SET CommandGET CommandEXISTS CommandChallenge: Basic CommandsINCR and DECR CommandsChallenge: INCR and DECRData Deletion
3. Data Types in Redis
StringListChallenge: Task Management SystemSetChallenge: Managing User InterestsSorted SetHash TableChallenge: Managing User Profiles
4. Advanced Features and Security
Managing Key ExpirationTransactionsPubSubSecurityRDB PersistenceAOF Persistence
5. Caching with Redis and Spring Boot
Introduction to CachingIntegration with Spring BootAnnotations for Working with CachePractical Use of Hashes

book
EXISTS Command

EXISTS Command

If you simply need to check whether a key exists in Redis without retrieving its value, you can use the EXISTS command.

Example Usage

If you provide a single key, the result will be 1 if the key exists, or 0 if it does not.

In this case, the result will be 1 since the key mykey exists.

When multiple keys are specified, the command will return the number of keys that exist in Redis. If we also have keys key1 and key3 in the database, this query will return 2, since only key1 and key3 exist in the database.

question mark

What will the EXISTS command return when checking multiple keys?

Select the correct answer

Var alt klart?

Hvordan kan vi forbedre det?

Tak for dine kommentarer!

Sektion 2. Kapitel 3
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