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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
12 rows · 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://deepaksharmaem12c.wordpress.com/2015/03/18/server-generated-alerts-like-metrics-database-time-spent-waiting-response_txn-etc-can-not-be-disabled-in-em12c/
Mar 18, 2015 · Message=Metrics “Database Time Spent Waiting (%)” is at 76.625 for event class “Concurrency” Severity=Warning Event reported time=Mar 8, 2014 4:34:25 PM CSTEstimated Reading Time: 5 mins
https://asktom.oracle.com/pls/apex/f?p=100:11:0::::P11_QUESTION_ID:9536610100346122879
Aug 27, 2020 · 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
https://www.dbasupport.com/forums/showthread.php?58684-Database-Time-Spent-Waiting-(-)-Wait-Class-Other/page2
Oct 07, 2008 · 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 for event class "Other" …
https://docs.oracle.com/cd/B19306_01/server.102/b14237/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 ...
http://www.orafaq.com/forum/t/96037/
Jan 22, 2008 · In my database concurrency wait problem is going on. I ran AWR report and got , Top 5 Timed Events ----- Event Waits Time(s) Avg Wait(ms) % Total Call Time Wait Class latch: cache buffers chains 37,078 5,894 159 37.3 Concurrency. How I can resolve the problem or what changes should I make so that concurrency problem would not occur. ...
http://www.deskdr.com/dr/database-time-spent-waiting.html
Waits by Wait Class Database Time Spent Waiting (%) Metrics "Database Time Spent Waiting (%)" is at 69.64818 for event class "Commit" Below are our environment details: RDBMS: 10.2.0.4 Oracle E-Business suite: 12.0.6 OS: Oracle Sun 10 Please suggest. Thank you. Please see the following docs.
https://community.oracle.com/tech/developers/discussion/1051070/performance-problem-event-cursor-pin-s-wait-on-x
Mar 25, 2010 · RATIONALE: Waiting for event "cursor: pin S wait on X" in wait class "Concurrency" accounted for 98% of the database time spent in processing the SQL statement with SQL_ID "f3jf4n8unym33". FINDING 3: 40% impact (17133 seconds) ----- Soft parsing of SQL statements was consuming significant database time.
https://omarfaruq.blogspot.com/2012/06/concurrency-waits-analysis-case-of-our.html
May 01, 2011 · I see a number of things which contributing to this concurrency problems from time to time. Here is the descriptive presentation - 1. There is an insert SQL on a table. Most of the times (almost every time I look at production during peak hours), we see a shared pool concurrency waits ("library cache: mutex x") on this statement.
http://www.dba-oracle.com/oracle10g_tuning/t_oem_wait_event_metrics.htm
§ Wait Time (%) – Alert when wait time increases by more than 25% The new OEM also allows the DBA to view session wait information at the metric level. For example, if OEM informs the DBA that the major wait event in the database is related to concurrency (locks, latches, pins), the DBA can drill down on the concurrency link to go to the OEM ...
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