Quick Answer: What Is Cassandra And MongoDB?

Who uses Cassandra database?

Who uses Apache Cassandra?CompanyWebsiteCountryMagento, Inc.magento.comUnited StatesQA Limitedqa.comUnited KingdomDatavalet Technologies Inc.datavalet.comCanadaAirgasairgas.comUnited States1 more row.

What DB does Netflix use?

NoSQL database CassandraWith billions of reads and writes daily, Netflix relies on NoSQL database Cassandra to replace a legacy Oracle deployment. Netflix is the big Kahuna of a Web media businesses, with 33 million subscribers in more than 40 countries.

What is the difference between MongoDB and Cassandra?

One of the most significant differences between MongoDB and Cassandra is their strategy concerning data availability. This feature dependents on the number of master slaves in a cluster. MongoDB has a single master directing multiple slave nodes. … Cassandra, on the other hand, uses a different model.

How does NetFlix use Cassandra?

Netflix uses Cassandra for its scalability and lack of single points of failure and for cross-regional deployments. ” In effect, a single global Cassandra cluster can simultaneously service applications and asynchronously replicate data across multiple geographic locations.”

Why is MongoDB good?

MongoDB is highly scalable, using shards. Horizontal scalability is a big plus in most NoSQL databases. MongoDB is no exception. It is also highly reliable due to its replica sets, and the data is replicated in more nodes asynchronously.

Is Cassandra key value?

Cassandra is a NoSQL database, which is a key-value store. … Data in Cassandra is stored as a set of rows that are organized into tables. Tables are also called column families. Each Row is identified by a primary key value.

Why do we need Cassandra?

Cassandra allows you to replicate your data to other data centers and keep multiple copies in multiple locations. This helps satisfy many regulatory requirements in addition to being a part of a strong disaster recovery and business continuity plan.

Is MongoDB better than SQL?

MongoDB is almost 100 times faster than traditional database system like RDBMS, which is slower in comparison with the NoSQL databases. … MongoDB supports deep query-ability i.e we can perform dynamic queries on documents using the document-based query language that’s nearly as powerful as SQL.

What database does Facebook use?

MYSQLFacebook uses MYSQL as the primary database management system for all the structured data storage such as the different wall posts, information of the various users, their timeline and so on. This particular data is being circulated between their different data centers.

What companies use Cassandra?

Cassandra is in use at Activision, Apple, BazaarVoice, Best Buy, CERN, Constant Contact, Comcast, eBay, Fidelity, Github, Hulu, ING, Instagram, Intuit, Macy’s™, Macquarie Bank, Microsoft, McDonalds, Netflix, New York Times, Outbrain, Pearson Education, Sky, Spotify, Uber, Walmart, and thousands of other companies that …

What is Cassandra DB good for?

Apache Cassandra is a free and open-source, distributed, wide column store, NoSQL database management system designed to handle large amounts of data across many commodity servers, providing high availability with no single point of failure.

Is Cassandra a document database?

Columnar Databases – HBase and Cassandra is a type of Columnar database. Columnar database reads and writes columns of data rather than the rows. … Document databases store and retrieve semi-structured data in the format of documents such as XML, JSON, etc.

When should you use Cassandra?

Ideal Cassandra Use CasesWrites exceed reads by a large margin.Data is rarely updated and when updates are made they are idempotent.Read Access is by a known primary key.Data can be partitioned via a key that allows the database to be spread evenly across multiple nodes.There is no need for joins or aggregates.

Why Cassandra writes are faster?

Major reason behind Cassandra’s extremely faster writes is its storage engine. Cassandra uses Log-structured merge trees, whereas traditional RDBMS uses B+ Trees as underlying data structure. If you notice “B”, you will find that Oracle just like MySQL has to read before write.

How does Cassandra DB work?

Cassandra is a peer-to-peer distributed system made up of a cluster of nodes in which any node can accept a read or write request. Similar to Amazon’s Dynamo DB, every node in the cluster communicates state information about itself and other nodes using the peer-to-peer gossip communication protocol.

Is Redis faster than MongoDB?

MongoDB is schemaless, which means that the database does not have a fixed data structure. This means that as the data stored in the database gets larger and larger, MongoDB is able to operate much faster than Redis. Redis is only significantly faster when the stored data is relatively small in size.

Is Cassandra faster than MongoDB?

If you work in an industry where you need rapid growth of your database, Cassandra offers easier rapid growth than MongoDB. MongoDB: MongoDB can be a great choice if you need scalability and caching for real-time analytics; however, it is not built for transactional data (accounting systems, etc.).

Which NoSQL database is best?

It is an Open Source NoSQL Database which utilizes JSON to store information and JavaScript as its query language.MongoDB.Cassandra.Redis.HBase.Neo4j.Amazon DynamoDB.Couchbase.Memcached.More items…•

Is Cassandra good for OLTP?

Cassandra works great for OLTP use cases and Druid works great for OLAP ones. If you already know your use case, then great, you know what system to use.

Where is Cassandra data stored?

Is Cassandra’s data stored only in the /var/lib/cassandra folder as mentioned in the cassandra.

When use Cassandra vs MySQL?

The plots show that Cassandra has a higher throughput for Workload A, B and F than MySQL. Conversely, MySQL has higher throughput for other three workloads. For workload C and 50000 operations, MySQL has a significantly higher throughput. Hence, it is more efficient in read-only operations than Cassandra.