1.9 Storing Graphs in Oracle Database and Loading Graphs into Memory

You can work with graphs in two-tier mode (graph client connects directly to Oracle Database), or three-tier mode (graph client connects to the graph server (PGX) on the middle-tier, which then connects to Oracle Database).

Both modes for connecting to Oracle Database can be used regardless of whether the database is autonomous or not autonomous.

The database schema storing the graph must have the privileges listed in Required Privileges for Database Users.

If you are using the Oracle Autonomous Database, see also Using Oracle Graph with the Autonomous Database for information about two-tier and three-tier deployments.

• Two-Tier Mode
  In two-tier mode, the client graph application connects directly to Oracle Database.
• Three-Tier Mode
  In three-tier mode, the client graph application connects to the graph server (PGX) in the middle tier, and the graph server connects to Oracle Database.