10.4 Loading a Subgraph from a PGQL Property Graph

You can create a subgraph from a PGQL property graph and load it into memory in the graph server (PGX).

Instead of loading a full graph into memory, you can load a subgraph. This would consume less memory.

The following sections explain in detail on loading and expanding of subgraphs:

• PGQL Based Subgraph Loading
  You can use the PgViewSubgraphReader#fromPgView API to create an in-memory subgraph from a PGQL property graph using a set of PGQL queries.
• Prepared PGQL Queries
  You can also use prepared queries when loading a subgraph from a PGQL property graph.
• Providing Database Connection Credentials
  You can specify the database connection credentials with the PgViewSubgraphReader#fromPgView API instead of using the default credentials of the current user.
• Dynamically Expanding a Subgraph
  You can expand an in-memory subgraph by loading another subgraph into memory and merging it with the current in-memory subgraph.