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Additional indexes can be added to RTG tables via SQL and that changes the file definitions that a COBOL application may see on table open.
Adding SQL Indexes to Sqlized Files
To allow AcuCOBOL to open these tables, EXTRA_KEYS_OK can be enabled in the runtime environment.
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This variable specifies the file system to use for a particular file. For example, if DEFAULT_HOST is set to VISION, and the file CUSTOMERS is a c-tree file, you could set the environment variable CUSTOMERS_HOST as follows:
Windows
set CUSTOMERS_HOST=CTREE
Unix
CUSTOMERS_HOST=CTREE;
export CUSTOMERS_HOST
This definition directs the runtime to treat CUSTOMERS as a c-tree file. Note that the file name may not include any path or directory name and should not include the file extension.
DEFAULT_HOST and filename_HOST are described in detail in Appendix H, Configuration File Entries, in Book 4 of the ACUCOBOL-GT documentation set.
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When your program executes, each time a file is opened, the ACUCOBOL-GT runtime checks filename_HOST and DEFAULT_HOST to determine which file system to use. You can change the value of these variables, just before you open the file, by including the following:
SET ENVIRONMENT "DEFAULT_HOST" TO value
or
SET ENVIRONMENT "filename_HOST" TO value
