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https://docs.oracle.com/cd/B16240_01/doc/doc.102/e16282/oracle_database_help/oracle_database_wait_sess_cls_dbtime_waitclass_pct.html
Database Time Spent Waiting (%) Description. This metric represents the percentage of time that database calls spent waiting for an event. Although there is no ‘correct’ value for this metric, it can be used to detect a change in the operation of a system, for example, an increase in Database Time Spent Waiting from 50% to 75%.
https://asktom.oracle.com/pls/apex/asktom.search?tag=concurrency-wait-event
Event Waits Time(s) Avg wait (ms) % DB time Wait Class ----- SQL*Net more data from client 35,972 9,805 273 65.90 Network cursor: pin S wait on X 159 5,688 35770 38.23 Concurrency DB CPU 1,629 10.95 enq: TX - row lock contention 9 136 15133 0.92 Application direct path write temp 63,834 82 1 0.55 User I/O
http://www.peasland.net/2013/11/25/em12c-database-time-spent-waiting-alerts/
EM12c Database Time Spent Waiting alerts. By bpeasland in Enterprise Manager, Oracle. I have an Oracle EM12c environment (version 12.1.0.3) set up to monitor my production databases. On one database, I occasionally get an alert for the ‘Database Time Spent Waiting (%)’ category. Yet I have disabled this metric in EM.
https://docs.oracle.com/cd/E11882_01/server.112/e40402/waitevents001.htm
This wait class only comprises one wait event - wait for redo log write confirmation after a commit (that is, 'log file sync') Concurrency. Waits for internal database resources (for example, latches) Configuration. Waits caused by inadequate configuration of database or instance resources (for example, undersized log file sizes, shared pool ...
https://www.dbasupport.com/forums/showthread.php?58684-Database-Time-Spent-Waiting-(-)-Wait-Class-Other/page2
Dear Friends, Please help me out to find in my prod db EM below issues. Sep 25, 2008 9:07:59 AM Metrics "Database Time Spent Waiting (%)" is at 100 for event class "Other" - Sep 25, 2008 9:02:50 AM Metrics "Database Time Spent Waiting (%)" is at 22.76449 for event class "Other" - Sep 25, 2008 9:01:50 AM Metrics "Database Time Spent Waiting (%)" is at 33.72828 …
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