Neo4j interview questions and Answers
Most Frequently Asked Neo4j interview questions
It’s an open source, graph database management system used to find the exact relations between data and then extract their true value accordingly. This service is implemented in Java. Due to its excellent performance, responsiveness, flexibility, and scalability; today Neo4j is one of the most business preferred graph database management system in the world.
Neo4j has tons of features for developers. Here are a few best of them:
- It follows a flexible schema and data model called graph model.
- It supports full ACID properties.
- Users can scale the database by increasing the number of reads/writes and volume, without affecting the speed of the query processing and data integrity.
- High end data safety and reliability.
- Built-in Neo4j browser web applications to create and retrieve graph data
Neo4j 3.5.3 is the latest version of this graph database management system which was released on 11 February 2019. It came with various significant feature improvements and bug fixes for the developers.
Neo4j uses Cypher as its query language. It’s a declarative graph query language that allows developers for efficient and expressive querying and updating various properties of a graph. It’s a simple yet compelling language.
In Neo4j, Node is a record or data present in a graph database. Here the CREATE statement is used by the developers to create a Node. Users can use the CREATE statement to create things such as create a single node/multiple nodes, create a node with a label/various labels, create a node with properties and returning the created node.
| S.no | Neo4j | MongoDB |
|---|---|---|
| 1. | It’s an open source graph database. | It’s a document storage |
| 2. | The Implementation language here is Java & Scala. | The implementation language is C++ here. |
| 3. | Neo4j has triggers. | It has no triggers. |
In Neo4j, the files are storage persisted for long term durability. All the data related file are located inside the Neo4j data directory - data/databases/graph.DB (v3.x+) by default.
In Neo4j, CQL or Cypher Query Language is a query language or Neo4j Graph Database, CQL is a declarative pattern machining language which follows SQL like syntax. CQL has read, write and general clauses. It is used to define properties of a relationship or a node.
| S.no | Neo4J | MySQL |
|---|---|---|
| 1. | It’s an open source graph database. | It’s an open source relational database management systems. |
| 2. | Implementation language: Java & Scala. | Implementation language:C & C++. |
| 3. | Server operating systems are Linux, OS X, Solaris, and Windows. | Server operating systems are FreeBSD, Linux, OS X, Solaris, and Windows. |
| 4. | Doesn’t support XML. | Supports XML. |