Manage graphs

This topic introduces how to manage graphs in NebulaGraph Cloud.

Prerequisites

• A graph type is created. For more information, see Create a graph type.
• To perform the operations in this topic, you must be granted related roles. For more information, see Access control.

Create a graph

Required role: Project Admin

1. In NebulaGraph Cloud, switch to the project you want to use, and click the name of the database to view the database details.
2. On the left-side navigation pane of the database details page, click Graph under Data.
3. In the upper-right corner, click the Create Graph button.
4. In the dialog box that appears, select a graph type from the drop-down list and enter a name for the graph.
5. Click OK. The newly created graph is displayed on the Graph List page.

Delete a graph

Required role: Project Admin

1. In NebulaGraph Cloud, switch to the project you want to use, and click the name of the database to view the database details.
2. On the left-side navigation pane of the database details page, click Graph under Data.
3. On the Graph List page that appears on the right, select the graph you want to delete.
4. Click at the right of the graph and then click Delete.
5. In the confirmation dialog box that appears, click Delete.

Manage indexes on graphs

Required role: Project Admin

NebulaGraph Cloud allows you to manage indexes on graphs, including creating, deleting, and rebuilding indexes.

Create an index

Required role: Project Admin

1. In NebulaGraph Cloud, switch to the project you want to use, and click the name of the database to view the database details.
2. On the left-side navigation pane of the database details page, click Graph under Data.
3. On the Graph List page that appears on the right, select and click the target graph.

4. On the Index tab, click the Create Index button. For each index, specify the following information based on its type:

   • Index Type: The type of the index. NebulaGraph Studio allows you to create indexes of the following types: Index, Vector Index, Spatial Index and Fulltext Index.
   • Index Name: The name of the index.
   • ON: The node type or edge type on which the index is created.

5. For a normal index, set Index Properties to the list of properties based on which the normal index is created. Specify at least one property. For each property, specify the following information:

   • Property Name: The name of the property.
   • Sort: The sorting order of property values in the index. Valid values: ASC and DESC.

6. For a vector index, set Property Name to the VECTOR property based on which the vector index is created and can configure the following settings:

   • METRIC
   • TYPE
     • When TYPE is set to IVF:
       • NLIST
       • TRAINSIZE
     • When TYPE is set to HNSW:
       • MAXDEGREE
       • EFCONSTRUCTION
       • CAPACITY

7. For a spatial index, set Property Name to the GEOGRAPHY property based on which the spatial index is created and configure the following settings:

   • s2_max_level
   • s2_max_cells

8. For a full-text index, set Property Name to the STRING property based on which the full-text index is created.

9. Click Create to create the index.

For more information about the GQL syntax for creating indexes, see Indexes overview.

Delete an index

Required role: Project Admin

1. In NebulaGraph Cloud, switch to the project you want to use, and click the name of the database to view the database details.
2. On the left-side navigation pane of the database details page, click Graph under Data.
3. On the Graph List page that appears on the right, select and click the target graph.
4. On the Index tab, select the index you want to delete.
5. Click the delete icon at the right of the index to delete it.

Rebuild an index

Required role: Project Admin

1. In NebulaGraph Cloud, switch to the project you want to use, and click the name of the database to view the database details.
2. On the left-side navigation pane of the database details page, click Graph under Data.
3. On the Graph List page that appears on the right, select and click the target graph.
4. On the Index tab, select the index you want to rebuild.
5. Click the Repair button to rebuild the index data.

View statistics about a graph

Required role: Project Admin or Project Member

1. In NebulaGraph Cloud, switch to the project you want to use, and click the name of the database to view the database details.
2. On the left-side navigation pane of the database details page, click Graph under Data.
3. On the Graph List page that appears on the right, select and click the target graph.
4. Click the Statistic tab.
5. To view the latest statistics, click the Execute Stats button to update the statistics about the graph. The statistics provide information about the number of nodes and edges in the graph.