NO SQL

Query Mechanism Tools For NoSQL

Query Mechanism Tools For NoSQL

The REST-based retrieval of a value based on its key/ID with the GET resource is the most frequent data retrieval mechanism.

Because they grasp the value in a key-value combination, document store databases allow for more challenging searches. With MapReduce, CouchDB, for example, allows you to define views.

What is the CAP Theorem?

Brewer's theorem is another name for the CAP theorem. It claims that a distributed data store cannot provide more than two out of three guarantees.

1)Consistency

2)Availability

3)Partition Tolerance

1)Consistency:

Even after an operation has been completed, the data should stay consistent. This indicates that once data is written, it should be included in any subsequent read requests. After altering the order status, for example, all clients should be able to see the same information.

2)Availability:

The database should be accessible and responsive at all times. There should be no downtime.

3)Partition Tolerance:

Partition Tolerance means that the system should keep working even if connection between the servers isn't always reliable. The servers, for example, can be divided into several groups that may or may not communicate with one another. If one portion of the database is down, the other sections are always up and running.