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Nebula Graph Database Manual FAQ

vesoft-inc/nebula

Nebula Graph Database Manual

vesoft-inc/nebula

Overview
Overview
- Introduction
- Documentation Index
- Concepts
  Concepts
  - Data Model
  - nGQL Overview
- Quick Start
  Quick Start
- Design and Architecture
  Design and Architecture
Query Language
Query Language
- Introduction
- Data Types
  Data Types
  - Data Types
  - Type Conversion
- Functions and Operators
  Functions and Operators
- Language Structure
  Language Structure
  - Literal Values
    Literal Values
    
    Boolean Literals
    
    Numeric Literals
    
    String Literals
  - Comment Syntax
  - Identifer Case Sensitivity
  - Keywords and Reserved Words
  - Pipe Syntax
  - Property Reference
  - Schema Object Names
  - Statement Composition
  - User Defined Variables
- Statement Syntax
  Statement Syntax
  - Data Definition Statements
    Data Definition Statements
    
    ALTER EDGE Syntax
    
    ALTER TAG Syntax
    
    CREATE SPACE Syntax
    
    CREATE EDGE Syntax
    
    CREATE TAG Syntax
    
    DROP EDGE Syntax
    
    DROP TAG Syntax
    
    DROP SPACE Syntax
    
    INDEX Syntax
    
    TTL
  - Data Query and Manipulation Statements
    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
    Utility Statements
    
    SHOW Statements
    SHOW Statements
    
    SHOW CHARSET Syntax
    
    SHOW COLLATION Syntax
    
    SHOW CONFIGS Syntax
    
    SHOW CREATE SPACE 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 TAGS EDGES Syntax
    
    SHOW USERS Syntax
    
    DESCRIBE Syntax
    
    USE Syntax
  - Graph Algorithm
    Graph Algorithm
    
    FIND PATH Syntax
Build Develop and Administration
Build Develop and Administration
- Build
  Build
  - Build Source Code
  - Build by Docker
- Installation
  Installation
- Configuration
  Configuration
- Account Management Statement
  Account Management Statement
- Batch Data Management
  Batch Data Management
  - Data Import
    Data Import
    
    Import .csv File
    
    Spark Writer
  - Data Export
    Data Export
    
    Dump Tool
  - Storage Balance
  - Cluster Snapshot
  - Long Time-Consuming Task Management
  - Compact
- Monitoring and Statistics
  Monitoring and Statistics
- Development and API
  Development and API
  - Nebula Graph Clients
Data Migration
Data Migration
- Nebula Exchange
  Nebula Exchange
  - About Nebula Exchange
    About Nebula Exchange
    
    What is Nebula Exchange
    
    Limitations
    
    Glossary
    
    FAQ
  - Compile Exchange
  - Examples
    Examples
    
    Use Exchange
    
    Import data from CSV files
    
    Import data from JSON files
    
    Import data from HIVE
  - Parameter reference
    Parameter reference
    
    Spark related parameters
    
    Nebula Graph related parameters
    
    Import command parameters
Nebula Graph Studio
Nebula Graph Studio
- About Nebula Graph Studio
  About Nebula Graph Studio
- Deploy and connect
  Deploy and connect
  - Deploy Studio
  - Connect to Nebula Graph
- Quick start
  Quick start
- Operation guide
  Operation guide
  - Use Schema
    Use Schema
    
    Operate graph spaces
    
    Operate tags
    
    Operate edge types
    
    Operate indexes
  - Use Console
    Use Console
    
    Open in Explore
    
    View subgraphs
Contributions
Contributions
Appendix
Appendix
中文手册
中文手册
- None

FAQ¶

What version of Nebula Graph does Exchange v1.x support?

Read Limitations to get the latest information about supported Nebula Graph versions.

What is the difference between Exchange and Spark Writer?

Both are Spark applications, and Exchange is based on Spark Writer. Both of them are designed for the migration of data into a Nebula Graph cluster in a distributed environment, but the later maintenance work will focus on Exchange. Compared with Spark Writer, Exchange has the following improvements:

Supporting more data sources, such as MySQL, Neo4j, HIVE, HBase, Kafka, and Pulsar.

Some problems with Spark Writer were fixed. For example, by default Spark reads source data from HDFS as strings, which is probably different from your graph schema defined in Nebula Graph. Exchange supports automatically matching and converting data types. With it, when a non-string data type is defined in Nebula Graph, Exchange converts the strings into data of the required data type.