12. Using the Query Optimizer : Query Execution Plans : View a QEP : Control QEP Generation Using a Environment Variable
 
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Control QEP Generation Using a Environment Variable
To control whether QEPs are generated using an operating system environment variable, issue the following commands:
Windows:
set ING_SET=set qep
UNIX:
C shell:
setenv ING_SET "set qep"
Bourne shell:
ING_SET = "set qep"
export ING_SET
VMS:
define ING_SET "set qep"