- User Id
- IP address
- Timestamp
- Clicked URL
- Item Rank
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Actual Costs:
CPU processing time of the query. Memory consumption (if possible).
Isolation of CPU time per query query can be difficult hence, number of parallel requests are also required to get accurate picture of CPU time.
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Mathematical Costs:
Size of posting lists to be processed and other simliar statistics that affects query execution time and memory.