Which data type supports key-value pair?

The data is fetched by a unique key or a number of unique keys to retrieve the associated value with each key. The values can be simple data types like strings and numbers or complex objects. MongoDB covers a wide range of database examples and use cases, supporting key-value pair data concepts.

What is the best key-value database?

Top 10 Key Value Databases

• Amazon DynamoDB.
• Amazon ElastiCache.
• Redis.
• Couchbase Server.
• Aerospike.
• Hbase.
• Azure Table Storage.
• ArangoDB.

What is Avro used for?

Avro is an open source project that provides data serialization and data exchange services for Apache Hadoop. These services can be used together or independently. Avro facilitates the exchange of big data between programs written in any language.

Should I use Avro?

Apache Avro is especially useful while dealing with big data. It offers data serialization in binary as well as JSON format which can be used as per the use case. The Avro serialization process is faster, and it’s space efficient as well.

What are examples of key value databases?

Redis, Riak, and Oracle NoSQL database are examples of key-value databases.

What is key value pair databases?

A key-value database is a type of nonrelational database that uses a simple key-value method to store data. A key-value database stores data as a collection of key-value pairs in which a key serves as a unique identifier. Both keys and values can be anything, ranging from simple objects to complex compound objects.

Does Avro need schema registry?

Avro not only requires a schema during data serialization, but also during data deserialization. Because the schema is provided at decoding time, metadata such as the field names don’t have to be explicitly encoded in the data. This makes the binary encoding of Avro data very compact.

When should I use key-value database?

When to Use Key-Value

• User preferences and profile stores.
• Large scale session management for users.
• Product recommendations (such as in eCommerce platforms)
• Customized ad delivery to users based on their data profile.
• Data cache for rarely updated data.

Which is the best example for key value store?

A telephone directory is a good example, where the key is the person or business name, and the value is the phone number. Stock trading data is another example of a key-value pair.

What are the keys and values of an Avro map?

The key for an Avro map must be a string. The values of a map hold the data type of the content of map. A union datatype is used whenever the field has one or more datatypes. They are represented as JSON arrays.

What are the different types of data types in Avro?

Along with primitive data types, Avro provides six complex data types namely Records, Enums, Arrays, Maps, Unions, and Fixed. A record data type in Avro is a collection of multiple attributes.

What is the full name of the Avro schema?

In the above example, the full name of the schema will be Tutorialspoint.Employee. In case of fields, it describes name of the field. Avro schema is having primitive data types as well as complex data types. The following table describes the primitive data types of Avro −

What is a key-value database?

A key-value database is a type of nonrelational database that uses a simple key-value method to store data. A key-value database stores data as a collection of key-value pairs in which a key serves as a unique identifier. Both keys and values can be anything, ranging from simple objects to complex compound objects.