Interview Questions.

Question 1. What Is Neo4j?

Answer :

Neo4J is an open-supply, schema-loose, NoSQL, famous graph database. It is the arena's leading open-source graph database.

Question 2. In Which Language Neo4g Is Written?

Answer :

Neo4J is written and implemented in Java language.

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Question 3. Which Query Language Is Used By Neo4j?

Answer :

Cypher Query Language (CQL) is utilized by Neo4J.

Question 4. Which Was The Neo4j First Version And When Was It Released?

Answer :

The first version of Neo4J became Neo4j 1.Zero and it was launched in Feb, 2010.

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Question 5. In Which Cases Neo4j Is Widely Used?

Answer :

Neo4J is extensively used for:

Highly related records Social Network
Recommendation- ( e-commerce)
Path Finding
Data First Schema (bottom-up)
Schema Evolution
A*(Least Cost Path)
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Question 6. What Is The Role Of Building Blocks Like Nodes, Relationships, Properties And Labels In Neo4j?

Answer :

Roles of building blocks:

Nodes: They are entities equivalent to rows in desk.

Relationship: It connects entities and shape domain.

Properties: It contains meta-facts and attributes.

Labels: It businesses nodes via position.

Question 7. Which Are The Several Popular Graph Databases?

Answer :

Neo4J is a totally famous Graph Database. Other Graph Databases are Oracle NoSQL Database, OrientDB, HypherGraphDB, GraphBase, InfiniteGraph, AllegroGraph and so on.

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Question 8. How Files Are Stored In Neo4j?

Answer :

Neo4J saved graph records in a number of one of a kind shop files, and each keep report incorporates the records for a specific a part of the graph for example relationships, nodes, residences and so on.

Question 9. What Is Cql? How Can You Run Cql Commands In Neo4j?

Answer :

CQL stands for Cypher Query Language. You should use "$" activate to run all CQL commands in Neo4j.

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Question 10. Which Query Language Does Neo4j Use And What It Contains?

Answer :

Neo4j uses Cypher question language, that's precise to Neo4j. If you want to traverse a graph, you need to understand wherein you want to begin (Start), the guidelines that allow traversal (Match) and what facts you are expecting lower back (Return).

The simple query carries:

START n

MATCH n-[r]- m

RETURN r;

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Question eleven. What Can You Delete Databases In Neo4j?

Answer :

If you need to delete/cast off entire graph listing you can use command rm -rf facts/*as such Neo4j isn't always storing some thing outside that.

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Question 12. Is It Possible To Query Neo4j Over The Internet?

Answer :

As such Neo4j were given RESTful API, you can query over the internet, or you could run it domestically. It runs within the Heroku or Cloud.

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Question thirteen. What Neo4j Cql Command Is Used For?

Answer :

Neo4j CQL command may be used for the following motives:

It is used to create nodes with and with out properties.
It is used to create a courting among nodes with homes.
It is used to create a dating among nodes with out homes.
It is used to make a couple of or unmarried labels to a Node or a Relationship.
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Question 14. What Is Match Command In Neo4j? Where Is It Used?

Answer :

Syntax for MATCH command:

MATCH  

(  

<node-name>:<label-name>  

)  

The MATCH command cannot be used alone to fetch information from the database otherwise it's going to show invalid syntax error.

Question 15. Why Is Set Clause Used For In Neo4j?

Answer :

In Neo4J CQL, SET clause is used for following purposes:

Update or Add houses values.
Add new homes to present Relationship or Node.
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Question sixteen. What Are The Indexing Capabilities Of Neo4j?

Answer :

Neo4j as a graph database capabilities indexing because the preferred way to discover begin points for graph traversals. Over the years a couple of exceptional indexing method were added. The goal of this text is to give an outline on this to keep away from confusion esp. For folks that just these days got commenced with Neo4j.

A graph database using a belongings graph model stores its facts in nodes, relationships and residences. In Neo4j 2.0 this model turned into amended with labels.

Neo4J supports no indexes inside the starting later it began aid for guide ,automated and schema indexes

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Question 17. Explain For What Purpose You Can Use Neo4j Databases?

Answer :

following are some areas in which you could use Neo4j Databases:

For  Social Networks in which data is highly linked.
For growing Recommendation machine in purchasing websites.
Algorithms used in pathfinding
Data First Schema
Schema Evolution
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Question 18. List Some Neo4j Cql Command?

Answer :

Neo4j CQL is a query language for Neo4j Graph Database.Is a declarative sample-matching language which follows SQL like syntax which might be quite simple and are in human readable layout

Below are some Neo4j CQL command:

CREATE,MERGE,SET,RETURN,START,LOAD CSV,REMOVE,CREATE UNIQUE,UNWIND,UNION,CALL

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Question 19. Why Neo4j Is Called Graph Database?

Answer :

Neo4J is referred to as graph database as it saves statistics structure in graph rather than in tables.

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Question 20. Is It Easy To Fragment A Neo4j Graph Across Multiple Servers?

Answer :

It may be very hard to fragment a Neo4J graph throughout more than one servers.

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