The items in a KB can represent both permanent and transient knowledge. For a description of how items represent knowledge, see Understanding the Knowledge Contained in Items.
System Tables
Each KB contains at least one set of system tables. System tables contain information that determines the default behavior of a G2 process. You can specify new values for any system table parameter, or you can use the default values.
The system tables that are currently active for a KB are called the installed system tables. Only the installed system tables affect the behavior of G2's run-time environment.