Which NoSQL provides consistency?

While HBASE and Redis can provide Consistency and Partition tolerance. And MongoDB, CouchDB, Cassandra and Dynamo guarantee only availability but no consistency. Such databases generally settle down for eventual consistency meaning that after a while the system is going to be ok.

What is Session consistency in NoSQL?

Session consistency means read-your-writes consistency but at session level. Session can be identified with a conversation between a client and a server.

Why NoSQL database are not consistent?

To answer the actual question directly: “Why are nosql databases not acid compliant” is because they weren’t designed to be. ACID is a lot of work and requries lots of resources in the machine, but even Google are being forced to go back to ACID and SQL!

Which database adheres to the consistency and partition tolerance of CAP Theorem?

CAP theorem NoSQL database types NoSQL Databases: What’s the Difference?” for more information.) Today, NoSQL databases are classified based on the two CAP characteristics they support: CP database: A CP database delivers consistency and partition tolerance at the expense of availability.

What is denormalization explain any two techniques of denormalization?

Denormalization is a database optimization technique in which we add redundant data to one or more tables. This can help us avoid costly joins in a relational database. Note that denormalization does not mean not doing normalization. It is an optimization technique that is applied after doing normalization.

How do you ensure consistency in a database?

Ensuring data consistency

1. Using referential integrity for data consistency. Referential integrity ensures that data is consistent across tables.
2. Using locks for data consistency. Locks can ensure that data remains consistent even when multiple users try to access the same data at the same time.
3. Checking data consistency.

What are consistency levels?

A Consistency Level (CL) is a dynamic value which dictates the number of replicas (in a cluster) that must acknowledge a read or write operation in order for the coordinator node to determine the operation was successful. CLs can be used with any transaction including LWTs.