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SQL programmingYou can use the HCL OneDB™ implementation of the SQL language to develop applications for HCL OneDB™ database servers.
Guide to SQL: ReferenceThe HCL OneDB™ Guide to SQL: Reference contains the reference information for the system catalog tables, data types, and environment variables of the HCL OneDB™ dialect of the SQL language, as implemented in HCL OneDB™. These topics also include information about the stores_demo, sales_demo, and superstore_demo databases that are included with HCL OneDB™.
Environment variablesVarious environment variables affect the functionality of your HCL OneDB™ products. You can set environment variables that identify your terminal, specify the location of your software and define other parameters.
Environment variables in HCL OneDB™ productsThe topics that follow discuss (in alphabetic order) environment variables that HCL OneDB™ database server products and their utilities use.
OPTOFC environment variableUse the OPTOFC environment variable to enable optimize-OPEN-FETCH-CLOSE functionality in applications or other APIs (such as JDBC, ODBC, OLE DB, LIBDMI, and Lib C++) that use DECLARE and OPEN statements to establish a cursor.

OPTOFC environment variable

Use the OPTOFC environment variable to enable optimize-OPEN-FETCH-CLOSE functionality in applications or other APIs (such as JDBC, ODBC, OLE DB, LIBDMI, and Lib C++) that use DECLARE and OPEN statements to establish a cursor.

0: disables OPTOFC for all threads of the application.
1: enables OPTOFC for every cursor in every thread of the application.

The default value is 0 (zero).

You can set the OPTOFC environment variable on the client or server. If this environment variable is set on the server, then any application that does not explicitly set this environment variable uses the value that is set on the server.

The OPTOFC environment variable reduces the number of message requests between the application and the database server.

If you set OPTOFC from the shell, you must set it before you start the application. For more information about enabling OPTOFC and related features, see the HCL OneDB™ ESQL/C Programmer's Manual.