Contents
Is MongoDB a CP or AP?
Relative to the CAP theorem, MongoDB is a CP data store—it resolves network partitions by maintaining consistency, while compromising on availability. MongoDB is a single-master system—each replica set (link resides outside IBM) can have only one primary node that receives all the write operations.
Is Cassandra an AP?
Apache Cassandra™ is usually described as an “AP” system, meaning it errs on the side of ensuring data availability even if this means sacrificing consistency.
Which is better Cassandra or MongoDB?
In sum, Cassandra is the modern version of the relational database, albeit where data is grouped by column instead of row, for fast retrieval. MongoDB stores records as documents in JSON format. It has a JavaScript shell and a rich set of functions which makes it easy to work with.
Why is MongoDB consistent?
How does MongoDB ensure consistency? MongoDB is consistent by default: reads and writes are issued to the primary member of a replica set. Applications can optionally read from secondary replicas, where data is eventually consistent by default.
Which topology used in Cassandra is?
network topology
Cassandra has a ring-type architecture. Cassandra has no master nodes and no single point of failure. Cassandra supports network topology with multiple data centers, multiple racks, and nodes. Cassandra read and write processes ensure fast read and write of data.
Why is MongoDB highly available?
Availability: MongoDB gets high availability through Replica-Sets. As soon as the primary goes down or gets unavailable else, then the secondaries will determine a new primary to become available again.
What’s the difference between MongoDB and Cassandra AP?
MongoDB’s replica set approach uses a single primary for write consistency (CP), while Cassandra’s replication strategy favours write availability (AP). Strong consistency is not possible with a network partition because there could be a conflict if both sides of the partition update the same data.
What is Cassandra and what is the CAP theorem?
Cassandra and the CAP theorem (AP) Apache Cassandra is an open source NoSQL database maintained by the Apache Software Foundation. It’s a wide-column database that lets you store data on a distributed network.
What does the CAP theorem say about MongoDB?
By default MongoDB drivers direct all reads & writes to the primary of a replica set, which is strongly consistent. The CAP theorem asserts that a distributed system must choose between consistency and availability in the event of a network partition.
How does MongoDB work as a single Master System?
MongoDB is a single-master system—each replica set (link resides outside IBM) can have only one primary node that receives all the write operations. All other nodes in the same replica set are secondary nodes that replicate the primary node’s operation log and apply it to their own data set.