Usage Tracking table column definition

Hi Gurus,
I am not able to visualize the difference / significance of these two columns in S_NQ_ACCT table for usage tracking:
NUM_CACHE_HITS - {Indicates the number of times existing cache was returned.}
NUM_CACHE_INSERTED - {Indicates the number of times query generated cache was returned.}
i got NUM_CACHE_HITS which gives the number of times cache match has occured, but what is role / meaning of NUM_CACHE_INSERTED, the documentation says "Indicates the number of times query generated cache was returned" what is query generated cache?
Thanks,
Sri

hi jups,
By deafult that parameter wil be null ,but any query got cached then it updates its value this way num_cache_inserted = 1
Will this help you Definitions of time-related fields of usage tracking data
hope helps you.
Cheers,
KK

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