Why should we turn off query cache when alternative UOM solution is used?

Hi, all, Why should we turn off query cache when alternative UOM solution is used?I found it in "Checklist for Query Performance", but I dont know why.
Please tell me if u know.
PS: I also dont know how to turn off the cache, Need your help, thanks!

hi ,
I have also some confusion regarding Cache Parameters . What is the importance of cache , Should we delete the cache memory time to time for each query ? I have chked it in RSRT but never use the chache monitor function .

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hi,
If you didnt surpress the messages in the RSRT,
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Why should we turn off query cache when alternative UOM solution is used?

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