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Why is TM_DELTA_CPU_TIME greater than TM_DELTA_TIME in V$ACTIVE_SESSION_HISTORY

edited Jan 6, 2017 2:44PM in Database Tuning (MOSC) 7 commentsAnswered ✓

Happy new year to All who read my post!

I am using Oracle 12c enterprise edition. While looking at V$ACTIVE_SESSION_HISTORY or DBA_HIST_ACTIVE_SESS_HISTORY, I see a lot of records with TM_DELTA_CPU_TIME or TM_DELTA_DB_TIME greater than TM_DELTA_TIME.. Is this possible? Or how reliable are these views? Per Oracle Manual,

TM_DELTA_TIME: Time interval (in microseconds) over which TM_DELTA_CPU_TIME and TM_DELTA_DB_TIME are accumulated

TM_DELTA_CPU_TIME: Amount of time this session spent on CPU over the last TM_DELTA_TIME microseconds

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