Interview Questions and Answers

Neo4j uses the Raft consensus algorithm to achieve distributed consensus and ensure data consistency in a distributed environment.

APOC is a library of useful procedures and functions for Cypher that extends the functionality of Neo4j. It provides additional features and utilities for advanced graph processing.

A Neo4j transaction event is a mechanism that allows users to subscribe to events that occur during transactions. It enables custom logic to be executed in response to specific database changes.

A graph kernel in Neo4j is a set of algorithms that operate on the graph structure. It allows users to perform advanced graph analysis and extract relevant patterns from the data.

Neo4j supports multiple transaction isolation levels, including READ UNCOMMITTED, READ COMMITTED, REPEATABLE READ, and SERIALIZABLE. Users can choose the appropriate level based on their requirements.

Causal Clustering in Neo4j is an architecture that supports high availability and fault tolerance. It uses a cluster of servers with a consensus algorithm to ensure data consistency.