Most Ingres environment variables in Windows and UNIX are set in the Ingres symbol table (symbol.tbl) and are visible only with the user command ingprenv.

When setting, unsetting, or changing environment variables, a backup of the symbol.tbl file, called symbol.bak, is maintained. If the original symbol.tbl file becomes corrupted, you can use the backup symbol table file to restore it.

A history of updates to the symbol.tbl file is maintained in the symbol.log file. The symbol.log file contains information on the types of updates performed as well as some application information.

The symbol.bak and symbol.log files are located in the II_CONFIG location or the II_ADMIN location (in the case of NFS Ingres instances).