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DB Time spent nowhere in AWR [message #683286] Thu, 24 December 2020 05:40 Go to next message
Messages: 20
Registered: April 2018
Location: Rome
Junior Member
Hi all,
while investigating an high response time per transaction, I came across an unusual (at least, for me) situation in which I can't find where the DB time is spent; for instance, below I copied the time model section from the AWR where you can see that no components seem to be contributing to the total DB Time. The same if we look at other figures in the report, like wait events: every figure is a fractional percent of the DB Time. Does anybody have any idea where I should loot at to find where this db time is spent?

Thank you in advance.

Time Model Statistics
                                                                % of  % of Total
Statistic Name                                       Time (s) DB Time   CPU Time
------------------------------------------ ------------------ ------- ----------
sql execute elapsed time                                935.0      .9
DB CPU                                                  607.5      .6       64.7
parse time elapsed                                       25.8      .0
hard parse elapsed time                                  23.3      .0
PL/SQL execution elapsed time                            16.2      .0
hard parse (sharing criteria) elapsed time                6.8      .0
hard parse (bind mismatch) elapsed time                   2.0      .0
connection management call elapsed time                   1.3      .0
PL/SQL compilation elapsed time                           0.2      .0
sequence load elapsed time                                0.1      .0
failed parse elapsed time                                 0.0      .0
repeated bind elapsed time                                0.0      .0
DB time                                             106,063.7
background elapsed time                                 335.3
background cpu time                                     331.0               35.3
total CPU time                                          938.5
Re: DB Time spent nowhere in AWR [message #683287 is a reply to message #683286] Thu, 24 December 2020 07:46 Go to previous message
John Watson
Messages: 8807
Registered: January 2010
Location: Global Village
Senior Member
DB Time arithmetic is often a bit odd. Operating system, platform, and virtualization can really confuse it. For example, AIX accounts for IO time very differently from Linux. Different virtualization methods may mean you have to interpret the numbers very differently. If you post the complete report, it might be possible for someone to comment.
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