Interview Questions

Q1 : What is a keyspace in Cassandra? A : In Cassandra, a keyspace is a namespace that determines data replication on nodes. A cluster consists of one keyspace per node. Q2 : How Cassandra delete Data? A : SSTables are immutable and cannot remove a row from SSTables.  When a row needs to be deleted, Cassandra assigns the column value with a special value called Tombstone. When the data is read, the Tombstone value is considered deleted. Q3 : What are the

Q1 : What is a router? What are its basic roles? A :  A router is a layer 3 network device used to establish communication between different networks. The roles of a router are – inter-network communication Best path selection Packet forwarding Packet filtering Q2 : What is point to point link? A : It refers to a direct connection between two computers on a network. A point to point connection does not need any other network devices other than connecting a cable

Q1 : What is data manager in the Couchbase Server? A : It is actually a functional block with some useful applications. Actually, it is responsible for the purpose of extracting, as well as storing the data from the applications. There are certainly other important tasks which it performs and without making an impact of the overall functionality of the software. Q2 : What is Cluster Manager in Couchbase? A : The cluster manager supervises the configuration and behavior of

Q1 :  What are alternatives to MongoDB? A : Cassandra, CouchDB, Redis, Riak, HBase are a few good alternatives. Q2 : What is Objecld composed of? A : Objectld is composed of Timestamp Client machine ID Client process ID 3 byte incremented counter Q3 : What makes MongoDB the best? A : MongoDB is considered to be best NoSQL database because of :Document-oriented (DO) High performance (HP) High availability (HA) Easy scalability Rich query language Q4 : What is a replica set? A :

Q1 : Why we use LINUX? A : LINUX is used widely because it is completely different from other operating systems where every aspect comes with something extra i.e. some additional features. Some of the major reasons to use LINUX are listed below It is an open source operating system where programmers get the advantage of designing their own custom OS Software and the server licensing required to install Linux is completely free and can be installed on many computers as

Q1 : In shell scripting, what is the significance of the Shebang line? A : It simply provides information regarding the location where the engine is placed. The engine is the one that executes the script. The Shebang line is present at the top of the script and it can be neglected by the users if they want the same Q2 : Where exactly you can store the Shell programs in the system? A : They are stored in a

Q1 : What are the various programming languages supported by Spark? A : Though Spark is written in Scala, it lets the users code in various languages such as: Scala Java Python R (Using SparkR) SQL (Using SparkSQL) Also, by the way of piping the data via other commands, we should be able to use all kinds of programming languages or binaries. Q2 : What are the various storages from which Spark can read data? A : Spark has been

Q1: What is SEO & why is it so important? A: In simple words, SEO or Search Engine Optimization denotes to any activity performed for the improvement of Search Engine rankings of websites, products, services or other content. It shows unpaid results which is also referred to as “free”, “organic”, “natural” or “earned” results. The importance of SEO starts with the desire of the companies to gain more traffic for their websites. The ranking over search engines matters because users pay

Q1: Explain R, what is R? A: R programming language is used for data analysis and to develop statistical software. R programming language is also used for machine learning purpose and applications. Q2: List out some of the function that R provides? A: The function that R provides are Mean Median Distribution Covariance Regression Non-linear Mixed Effects GLM GAM. etc. Q3: How R commands are written? A: By using # at the starting of the line of code like #division commands are written.