Welcome to Nebula Graph 1.2.1 Documentation¶

Nebula Graph is a distributed, scalable, and lightning-fast graph database.

It is the optimal solution in the world capable of hosting graphs with dozens of billions of vertices (nodes) and trillions of edges with millisecond latency.

Tutorial Video¶

• YouTube
• bilibili

Preface¶

• About This Manual
• Manual Change Log

Overview (for Beginners)¶

• Introduction
• Concepts
  • Data Model
  • Query Language Overview

• Quick Start and Useful Links

  • Get Started
  • FAQ
  • Build Source Code
  • Import .csv File
  • Nebula Graph Clients

• Design and Architecture
  • Design Overview
  • Storage Architecture
  • Query Engine

Query Language (for All Users)¶

• Data Types
  • Data Types
  • Type Conversion
• Functions and Operators
  • Bitwise Operators
  • Built-In Functions
  • Comparison Functions And Operators
  • Group By Function
  • Limit Syntax
  • Logical Operators
  • Order By Function
  • Set Operations
  • String Comparison Functions and Operators
  • uuid Function
• Language Structure
  • Literal Values
    • Boolean Literals
    • Numeric Literals
    • String Literals
  • Comment Syntax
  • Identifier Case Sensitivity
  • Keywords and Reserved Words
  • Pipe Syntax
  • Property Reference
  • Schema Object Names
  • Statement Composition
  • User-Defined Variables

• Statement Syntax

  • Data Definition Statements
    • Alter Edge Syntax
    • Alter Tag Syntax
    • Create Space Syntax
    • Create Edge Syntax
    • Create Tag Syntax
    • Drop Edge Syntax
    • Drop Space Syntax
    • Drop Tag Syntax
    • Index
    • TTL (time-to-live)
  • Data Query and Manipulation Statements
    • Delete Edge Syntax
    • Delete Vertex Syntax
    • Fetch Syntax
    • Go Syntax
    • Insert Edge Syntax
    • Insert Vertex Syntax
    • Lookup Syntax
    • Return Syntax
    • Update Edge Syntax
    • Update Vertex Syntax
    • Upsert Syntax
    • Where Syntax
    • Yield Syntax
  • Utility Statements
    • Show Statements
      • Show Charset Syntax
      • Show Collation Syntax
      • Show Configs Syntax
      • Show Create Spaces Syntax
      • Show Create Tag/Edge Syntax
      • Show Hosts Syntax
      • Show Indexes Syntax
      • Show Parts Syntax
      • Show Roles Syntax
      • Show Snapshots Syntax
      • Show Spaces Syntax
      • Show Tag/Edge Syntax
      • Show Users Syntax
    • Describe Syntax
    • Use Syntax
  • Graph Algorithms
    • Find Path Syntax

Build Develop and Administration (for Developers and DBA)¶

• Build
  • Build Source Code
  • Build By Docker
• Install
  • rpm Installation
  • Start and Stop Services
  • Deploying Cluster
• Configuration
  • System Requirement
  • Config Persistency and Priority
  • CONFIG Syntax
  • Metad Configuration
  • Graphd Configuration
  • Storaged Configuration
  • Console Configuration
  • Kernel Configuration
  • Change Log Severity on a Host
• Account Management Statement
  • Alter User Syntax
  • Authentication
  • Built-in Roles
  • Change Password
  • Create User
  • Drop User
  • Grant Role
  • LDAP
  • Revoke
• Batch Data Management
  • Data Import
    • Import .csv File
    • Spark Writer
  • Data Export
    • Dump Tool
  • Storage Balance
  • Cluster Snapshot
  • Long Time-Consuming Task Management
  • Compact

• Monitoring and Statistics

  • Metrics
  • Meta Metrics
  • Storage Metrics
  • Graph Metrics
  • RocksDB Statistics
  • Development and API
  • Nebula Graph Clients

Contributions (for Contributors)¶

• Contribute to Documentation
• Cpp Coding Style
• How to Contribute

Appendix¶

• Gremlin V.S. nGQL
• Cypher V.S. nGQL
• SQL V.S. nGQL
• Vertex Identifier and Partition