Database Time Spent Waiting % For Event Class Concurrency
Dec 4, 2012
Most of my day to day work involves the support of DB2 on AIX and z/OS. I support the database infrastructure for one business system that runs on the Oracle RDBMS. The application is Oracle Transportation Management. The non-production environments don't get much traffic. If I sign into the TEST or DEV Enterprise Manager DB Control screen, the following warning is almost always listed on the main page:
Metrics "Database Time Spent Waiting (%)" is at 44.00384 for event class "Concurrency"
Enterprise Manager reports that this metric is continuously fluctuating above and below the warning threshold of 30% of db time when the environment is idle.To investigate(and I am no oracle expert, far from it), I ran the following:
SELECT * FROM v$session_event
WHERE WAIT_CLASS='Concurrency'
ORDER BY TOTAL_WAITS DESC;
By far, the top two entries in the result are the following:
SIDEVENTTOTAL_WAITSTIME_WAITEDAVERAGE_WAITMAX_WAIT
124os thread startup12041423733.5218
359os thread startup150653433.5521
[code]...
Does this indicate a possible problem with the operating system?
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Jan 16, 2012
i'm keep on getting below error every morning in my Database.this indicate in Grid control every morning.
Metrics "Database Time Spent Waiting (%)" is at 34.336 for event class "Concurrency"
Metrics "Database Time Spent Waiting (%)" is at 100 for event class "Other"
Metrics "Database Time Spent Waiting (%)" is at 44.78 for event class "Other"
i need to know, this is something that i should consider as a critical warning and how can i solve this .
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Jan 5, 2012
I have a problem with a statement that normally execute in few second but after 50h the session is still active and is still waiting for null event.
V$session_wait
EVENT WAIT_TIME SECONDS_IN_WAIT STATE
---------------------------------------------------------------- ---------- --------------- -------------------
null event -1 178737 WAITED KNOWN TIME
V$session
SID STATUS PROGRAM LAST_CALL_ET
---------- -------- ------------------------------------------------ ------------
364 ACTIVE f90runm@CENTRAL1 (TNS V1-V3) 178737
My Oracle version : Oracle9i Enterprise Edition Release 9.2.0.2.0 - 64bit Production
System version : HP-UX V1
I tried tracing the session but no trace file is generated it same there is no activity.
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Jun 17, 2013
I have two methods using pro*c to execute a query SQL and read the results. The query is a "select from" a view, this view is a union between two tables. The first method creates a cursor and fetches the results line by line. A second method creates a cursor and fetches the results in parts.
Method 1)
CODEEXEC SQL FETCH Cursor1 INTO ...
Method 2)
CODEEXEC SQL FOR :numLines FETCH Cursor1 USING DESCRIPTOR areaDescSQL;
I had executed this methods in my development enviroment, using Oracle 11g, Suse linux. As I expected, the method 2 spent much less time than the method 1. But, in the "customer enviroment", using another database, Oracle 11g and HP-UX, these methods spent almost the same time.
Is there some Oracle's configuration or parameter's settings that maybe explain that? What configuration can be differente between the two databases? What can I do to improve the time spent?
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Mar 6, 2013
we are running Oracle R12.1.3 on DB version 11.2.0.3. I just migrated a created a custom subscription for the oracle.apps.ap.supplier.event Oracle Event. I execute a custom package when this event fires. My package is working fine and I'm getting the expected results. My problem is I keep getting a Workflow notification saying:
Sent: Monday, March 04, 2013 9:14 PM
To: SYSADMIN
Subject: Action Required: Local Event UNEXPECTED : oracle.apps.ap.supplier.event / 36422
To SYSADMIN
Sent 04-MAR-2013 21:13:40
ID 1659929
An Error occurred in the following Event Subscription: Event Subscription
Event Error Name:
Event Error Message: No Event Subscriptions exist for this Event
Event Error Stack:
Event Data: Event Data URL
Event Details
Event Field Value
[code]...
I saw an earlier post about this and have tried changing the Source Type to "External" but that didn't change anything. why Workflow is telling me a subscription doesn't exist when my subscription is executing with no problems.
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Dec 11, 2012
I am trying to look at wait events for a long running query in TOAD.I start the query on one instance of TOAD and open the Session Browser on another instance.But I am surprised to find that in "TOtal Waits" on the RHS-> SQL*Net message from client is the longest time taking and is already -> 178577 units whereas I have just started the query.
Whereas in the Current Waits it shows DB File Scattered Read currectly as some seconds.
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May 15, 2011
I've heard about diferent ways of generating email in response to a database event e.g
1 - Using UTL_MAIL package.
OR
2 - Event Driven Reporting feature of 10g Database and using SRW.Run_Report package to generate and mail a report.
Now I'm confused that how should I accomplish the following tasks:
(i) - How to generate an email after Insert/Update/Delete on a table and acknowledge the concerned users about that event?
(ii)- How to attach a text file with that email?
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Mar 28, 2013
I have database 10.2.0.3 with one procedure that calls some java class loaded in database. Unfortunately I don't have source code of that java class or whole jar that was loaded into database.I would like to download it from database and try to decompile it.
how can I download some java classes from database? Everything I know is only the name of some java class that is used in one PL/SQL procedure (CREATE OR REPLACE PROCEDURE ..... AS LANGUAGE JAVA).
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May 7, 2013
Any example of database startup event and database shutdown event?
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Jun 26, 2013
How to Pick / Extract the java class files from the database.? We have not maintained the latest codes in the oracle application server where java class code is residing.
All the Java Classes are available only in database. So we need to pick the latest java class code from production environment. In TOAD we tried but all class objects are listing at the left side but we are unable to take the code. So how can we take the latest codes(java classes) from the Production Database as a backup.
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Jul 18, 2012
can i use ORA_ROWSCN to handle concurrency in oracle, That is i want to read ora_rowscn and keep it in my form or BL then before update i want to read ora_rowscn and match with old version.
1)Since it is updated after commit , how can it affect the application?
2) should i use some Guid in place of ORA_ROWSCN?
3) sequence in each table with trigger in place of ORA_ROWSCN?
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Feb 19, 2013
I am running Oracle RAC 2 nodes 11g R2 on AIX 7.1
I have a table with unique index, and the application is doing inserts/updates into this table.Suddenly and for about half a minute I faced a high concurrency waits on all the processes running these inserts for one node. I saw this high concurrency wait in the top activity screen of the OEM only on one of the nodes. knowing that the processes doing these inserts are running on both nodes.
All what I have that in this half minute I see high concurrency wait in OEM top activity screen related to this insert statement and when I clicked on the insert I found high "enq: TX - index contention". Again this was only on one node.After this half minute everything went back to normal.What could be the reason and how can I investigate it ?
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Nov 28, 2012
When running into what should be an OptimisticConcurrencyException in entity framework, i'm getting an update exception as follows:
"A null store-generated value was returned for a non-nullable member 'DateChanged' of type 'FDDT.Model.FeedArray'."
I'm using the DateChanged field as the concurrency tracking field. In entity framework DateChanged has the following properties:
StoreGeneratedPattern: Computed
Concurrency Mode: Fixed
I have a trigger set on this field as follows:
TRIGGER FEED_ARRAY_TRIG_DTCHG before update on FEED_ARRAY for each row
begin
:new.DATE_CHANGED := sysdate;
end;
I've tried setting this concurrency tracking field to "Identity" instead, however that causes another error when I run into a concurrency exception and refresh using the client wins option.
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Mar 2, 2010
I am getting ORA-02049: timeout: distributed transaction waiting for lock , how to resolve this type error
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Nov 20, 2012
Installation Oracle Database 11g Release 2 RAC On Linux Using VMware Server folowing error occured
Software = Grid Infrastructure 11.2.0.1
RAC installation on VMware two node linux machine.
Windows 7 Machine 8 GB Ram
LInux node 1 and node 2 with 2.5 GB RAM
Node 1: root.sh script run successfully.
NOde 2: root.sh script given following error.
CRS-2672: Attempting to start 'ora.crsd' on 'rac2'
CRS-2676: Start of 'ora.crsd' on 'rac2' succeeded
CRS-2672: Attempting to start 'ora.evmd' on 'rac2'
CRS-2676: Start of 'ora.evmd' on 'rac2' succeeded
Timed out waiting for the CRS stack to start.
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Nov 18, 2010
I am getting "ORA-00060: deadlock detected while waiting for resource" while deleting a datafile.
when i checked in dba_data_files and V$datafile the ONLINE_STATUS/STATUS is in RECOVER mode.
I do not need this datafile so i tried to drop using the following command ..
ALTER TABLESPACE DATAP_LARGE DROP DATAFILE 'D:\ORACLE\ORADATA\DATAP\DATAP_LARGE_12.DBF';
I checked the Trace file geenrated for the deadlock, the Session which is in question is the session where i ran the command (SQLPLUS).
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Nov 4, 2013
i am getting a below error whenever executing the below select query. some times it will show dead lock detected while waiting for resource and terminated...some times it executes and gives result..but all the time it writes an alert to alert log
Env: Linux / Oracle 11.2.0.3.3..Error from alert log:Errors in file /u01/oracle/oracle/diag/rdbms/bdrdb/bdrdb/trace/bdrdb_p017_6076.trc:ORA-00060: deadlock detected while waiting for resourceORA-10387: parallel query server interrupt (normal) Trace file info... bdrdb_p017_6076.trc:Trace file /u01/oracle/oracle/diag/rdbms/bdrdb/bdrdb/trace/bdrdb_p017_6076.trcOracle Database 11g Enterprise Edition Release 11.2.0.3.0 - ProductionWith the Partitioning, OLAP, Data Mining and Real Application Testing optionsORACLE_HOME = /u01/oracle/oracle/product/11.2.0/dbhome_1System.
[code]....
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May 25, 2011
When i try to compile a package, im getting below error.
ERROR at line 1:ORA-04021: timeout occurred while waiting to lock object
i gave below query and found the sid of object.
select * from v$access where object='THINKING_PKG'
From v$session view,i found sid and serial# and at same time i queried dba_jobs and saw one jobs is running at this time.Now how to compile this object.
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Jul 4, 2011
I have an application in which time is show as . But, in the table in Oracle it is showing as 13:00. The application is taking the time from OS. OS time is 18:30 IST. Time in SYSDATE is also showing as 18:30. DBTIMEZONE is '+5:30'. what is the problem in Database and how that can be rectified to show the time as same as OS time.
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Dec 3, 2012
how to know the trigger event name in trigger calling...like-
CREATE OR REPLACE TRIGGER ******
BEFORE DELETE OR INSERT OR UPDATE
OF TOTAL_QUANTITY,CANCELLED
ON *********
REFERENCING NEW AS NEW OLD AS OLD
FOR EACH ROW
BEGIN
-----------I want to know given trigger event at this level-----------
IF INSERTING THEN
null;
ELSIF UPDATING THEN
null;
ELSIF DELETING THEN
null;
END IF;
END;
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May 27, 2008
How to display row value of each class as a column value
IDNAMECLASSHOURSSCHOOLNAME
1AllenMaths12school1
2SamMaths12school1
4PamMaths10school1
3SamComp10school1
9SmithComp15school1
7SmithPhy20school1
5PamPhy12school1
[code]....
I wanted output like below for School1
NamemathsCompPhyAccountsBusiness
Allen120000
Sam1210000
Pam10012150
Smith01520120
Adams000030
I wanted output like below for School2
NameCompAccountsBusiness
Anthony2000
Chris102020
I wanted output like below for School3
NamemathsAccounts
Angelo2015
Robert1515
how to write a single query, Also i may add /delete school/class anytime. Query should support mesans everything dynamically should get the data.Even stored procedure will work for me.
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Aug 24, 2008
I'm modifying a package which contains a function with different parameters (say cno, gno, pname etc) need to be passed though it and that function is called by the cursor later in the program. I need to create a cursor (select statement) for every class (a program set)...i.e. multiple select statements for a program set with different values. The parameters needed to be passed correspond to same columns in different tables...so do i have to refer those tables everytime i'm passing the parameters using a select statement? The Program accepts the parameters as an array (list of parameters) and returns a cursor and the program handles one program set (class) at a time. That parameter list will be in a loop..i.e. it will be repeated for every certain combination (say cno - pname combination). So ... How should i proceed and create a select statement with different parameters declared in the function of type string making it dynamic and returning them using ref cursor?
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Jun 2, 2010
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I created a sound,java file using Oracle9i JDeveloper, I compile it and the result is:
" Compiling...
D:Dev9ijdevWorkspaceWorkspace5soundsrcoracleformsfdSound.java
Successful compilation: 0 errors, 0 warnings."
I deploy sound.java to sound,jar and the deployed process is completed Successfully. I also executed all the configuration steps required to use this class from "Orale9i form builder" and it's ok
The problem is:
When I tried to import "sound" class from "Oracle9i form builder" by clicking
Program----> Import Java Class-----> Oracle.forms.fd.sound
Then an error has occurred:
Importing Class oracle.forms.fd.Sound...
Exception occurred: java.lang.NoClassDefFoundError: oracle/forms/ui/VBean
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Oct 8, 2013
DB 11.2.0.2AIX 6
I am getting following two top wait events from AWR report
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Sep 24, 2013
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Jun 22, 2013
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Apr 7, 2011
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So if I have a list of reviewers, facilities, reviewees I want to select only those SNF/NF residents who have had routine reviews in any two consectutive months at the same facility.
This is my query:
select ConsultantID, ResidentID
from (
select distinct ConsultantID, FacilityID, ResidentID
from Reviews
where BedType = 17820 -- SNF/NF bed
and ReviewType = 17474 -- routine review
)
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Apr 12, 2010
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