# VID

TODO(doc)

## VID¶

VID is short for vertex identifier.

In Nebula Graph, vertices are identified with vertex identifiers (i.e. VIDs). The VID can be an int64 or a fixed length string. When inserting a vertex, you must specify a VID for it.

You can also call hash() to generate an int64 VID if the graph has less than one billion vertices.

VID must be unique in a graph space.

That is, in the same graph space, two vertices that have the same VID are considered as the same vertex.

In addition, one VID can have multiple TAGs. E.g., One person (VID) can have two roles (tags).

Two VIDs in two different graph spaces are totally independent of each other.

Last update: May 20, 2021