Interview Questions.

1. Analyze Couchbase and MongoDB 

Criteria	Couchbase	MongoDB
Scalability	Seamless scalability	Multi-step scalability
Consistency	High	Low
Uptime	Always up	Needs maintenance

2. Is Couchbase an open sourse programming? 

Indeed. Couchbase can be perceived as an open source programming delivered under the Apache 2.0 permit with an undertaking and network version. Couchbase is an appropriated diverse NoSQL document situated information base programming bundle that is progressed for aggregate applications and open-source programming. 

3. What is Couchbase Server? 

Couchbase worker is a simple, quick, flexible NoSQL information base. It is otherwise called Membase, appropriated, multi-model NoSQL document arranged information base programming bundle that is progressed for aggregate applications. 

4. What are the essential highlights of the Couchbase worker? 

The essential highlights of the Couchbase Server are 

• Quick – Couchbase is known for its speed. Couchbase worker encourages the lower inactivity and most noteworthy throughput. The presentation cost will be low and it is an exceptional sign . 
• Straightforward – Couchbase worker is basic regarding overseeing, introducing, getting, growing and utilizing it. In a Couchbase worker, it isn't important to make and oversee diagrams, as a report information base without normalizing and tuning of the information base. 
• Versatile – The Couchbase worker will disseminate the information and I/O over virtual machines or product workers, subsequently it can make it simple to relate the ideal amount of assets to the changing necessities of an application. In couchbase worker the hubs can be upgraded from 1 to 100 tons in a group and furthermore can get diminished to support application execution. 
• Dependable – Couchbase worker is steady and endeavor prepared programming, so anybody can depend on strategic applications. 

5. Recognize CouchDB and Couchbase worker. 

CouchDB: Apache CouchDB is fit for putting away the JSON records and furthermore gives the office to join the non-JSON records to those documents.Couchbase worker: Couchbase worker is equipped for putting away the accreditations and key-values, along these lines, it will have the option to store paired information or some other sort of information and furthermore JSON archives. The couchbase worker takes the assistance of a Memcached parallel convention for key-esteem functionalities and REST API's SQL and view questions. 

6. What number of practical squares have associated with Couchbase worker and brief about them? 

There are two diverse useful squares of Couchbase worker and are 

• Information Manager 
• Bunch Manager 

1. Information Manager : Data Manager is liable for putting away and separating the information from applications in response to information handling prerequisites. Information Manager will unveil 2 "memcapable" docks to the arrangement of associations. 1 port aides non-vBucket mindful customer libraries and another will manual for the vBucket mindful customer libraries. The greater part of Data administrator code is written in C and C++ programming dialects. 
2. Bunch Manager : Cluster supervisor is made to care for the course of action in addition to the presentation of all hubs in a couchbase worker group. The trough's code will run on each knot in the bunch and chooses one hub for accumulation. The a large portion of the Cluster Manager code is written in Erlang/OTP. 

7. What is vBucket? 

Vbucket is one of the methods of intelligently dividing information in view of this nature, it can circulate everywhere on the hubs in a group. Each couchbase kind container that gets made in the bunch is naturally separated into a static arrangement of cuts, later they guide to singular workers. They are utilized to apportion the data viably alongside all through a bunch. 

8. What are the 4 subsystems which work on each hub? 

• Heartbeats : Watchdog grows routinely trade a couple of words with the by and by assigned bunch head to offer prosperity overhauls. 
• Movement Monitor : This is the subsystem to screen on doing of the restricted data chief, continuing ineffective techniques varying and contributing condition information to the beating piece. 
• Example Manager : It is realized that each hub in the group has an example model: vBucket map, an expectation map, and so on This subsystem will get, screen and cycle nearby design. 
• Overall Singleton Supervisor : This is of the subsystems and its errand is to choose bunch head if the recently casted a ballot head passes on and observing "per-group" conveys if the neighboring bump is the current boss. 
• For Additional Reading :- A Brief Note On The Distinctions Between Couchbase And MongoDB 

9. What vBucket Map speaks to? 

The vBucket map is answerable for speaking to the condition of a group once a right now running rebalance activity finishes. The cycle called Rebalance Orchestrator correspond the objective current guides to close which development Tap Streams to make and oversee. The activity of Rebalance will get comprehensive when the current and Target vBucket Maps are similar. 

10. What are the TCP ports used to tune in to the solicitations? 

The port numbers are configurable. The default ports are as beneath: 

• Port 11210 : It is a port which is straightforwardly available to customers executing rendition 2.0 of the memcapable API. Those are "vBucket mindful" customers and are relying upon the hashing calculation to plan keys to one of a reasonable number of "vBuckets". The vBuckets later will get planned to a worker, giving a layer of indirection empowering lively bunch rebalancing, non-troublesome group extension or withdrawal, replication and failover. 
• Port 11211 : The typical Memcached port number cycles demands from, customers managing rendition 1.0 of the memcapable API prerequisite. Those customers will rely upon a steady hashing calculation to plan enters transparently to workers in a variable-length worker inventory. 

11. What is the significance of making a Data Bucket? 

It makes critical to make a Data Bucket since the couchbase worker stores the information in Data Buckets. The "Default" basin is made when the couchbase worker is introduced. The limit of an information container to store the information is up to 20MB. Whenever required, extra information basins can be added. The pail creation will have a cutoff when there is no adequate space in RAM. Ex: limit the RAM/Quota utilization for the default pail to 100 MB.