2. Overview of OpenSQL : What Is OpenSQL? : Enterprise Access Products
 
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Enterprise Access Products
Enterprise Access products (sometimes referred to as Gateways) are interfaces between Ingres applications and database management systems other than Ingres. The Enterprise Access products provide a variety of services, including:
Translating between OpenSQL and host query interfaces, such as Rdb/VMS (for Alpha VMS), or DB2 UDB (for IBM DB2 Universal Database)
Emulating SQL functions for non‑relational databases such as IMS and RMS
Converting between OpenSQL data types and data types that are native to other host database management systems
Translating host DBMS error messages to Ingres generic errors
Enterprise Access products are transparent, meaning that host databases are presented as if they are Ingres databases.