Query Environment
When a thread or session executes a query inside the DBMS Server, it does so in a query environment. The query environment consists of:
• A quantity of resources available from the operating system for use by the session.
• The rules under which the query is executed. These rules reflect which query language is used, which locking strategy is employed, which diagnostic information is returned, which default behavior Ingres adopts for various query language statements, and so on.