When running a Health Check against an 8i database Toad hangs. I was able to isolate the option which is causing the issue:
Under 'Schema': 'List unique keys with one or more nullable columns' .
If this option is unchecked the Health Check completes OK.
WORKAROUND:
Uncheck option 'List unique keys with one or more nullable columns' .
STATUS:
Waiting for fix in a future release of Toad for Oracle.
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