NebulaGraph Overview

NebulaGraph is a high-performance, distributed graph database designed for big data applications. It supports both property graphs and graph queries with its own query language called Nebula Query Language (nGQL).

2.1 Graph Structure

• Nodes: The entities in the graph.
• Edges: The relationships or connections between nodes.
• Properties: Key-value pairs that provide additional information about nodes or edges.

2.2 nGQL

The Nebula Query Language (nGQL) is similar to SQL but optimized for graph data. It allows users to perform queries, updates, and data manipulation on graph structures.

To install NebulaGraph, follow these steps:

1. Download the latest version from the NebulaGraph releases page.
2. Unpack the downloaded archive.
3. Run the following commands to start the services:

cd nebula-graph
./bin/nebula.service start

To use NebulaGraph, you can execute queries using the Nebula console:

./bin/nebula-console -u user -p password

Example query to create a vertex and an edge:

CREATE (person:Person {name: "Alice"})
CREATE (person:Person {name: "Bob"})
CREATE (person)-[:KNOWS]->(person)

• Use indexes to optimize query performance.
• Properly design the schema to avoid redundancy.
• Regularly back up your data.
• Monitor performance metrics for tuning.