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DB Time - Performance Focus Area

DB Time = Sum of DB Time over all sessions

Time spent by clients in database calls

• Foreground session time
• Active = on CPU or in-Wait (non-idle)

DB time is also time spent servicing calls

More users
-------------
• => More calls
• => DB time increases

Larger transactions
---------------------
• => Longer calls
• => DB time increases

IO performance degrades
------------------------
• => IO time increases
• => DB time increases

Application performance degrades
---------------------------------
• => Wait time increases
• => DB time increases

Host is CPU-bound
-----------------------
• => foregrounds accumulate active run-queue time
• => wait event times are artificially inflated
• => DB time increases
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