How to get number of open cursors per connection?

I am trying to make sure my connection pool handles all
situations where I need to close and reopen a Connection
object.
The last criteria I am trying to check is, how many open cursors
are there on a connection that is supposedly no longer in use?
If my application tells my Connection pool class that a
Connection is not in use anymore, the Connection can be
reused unless there are too many open cursors. I'm closing all my
statments, but I want to make sure that I've got this check in
place.
TIA,
Mike
null

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Avg number of open cursors per session

We've been noticing a large number of open cursors open per session in our database, these users being Oracle Forms users. There are quite a few 'bells & whistles' in this vendor-supplied application with many round trips to the database. The warning we were receiving was induced by an alert that we had set up within OEM.
It got me wondering then, what a large number of cursors per process really was. We're seeing between 10-80 open cursors. The init parm OPEN_CURSORS has a default value of 50 upon installation (which is per session), so the max of 80 doesn't seem too much higher.
Are we really experiencing a large # of open cursors per session? Does someone have a means of estimating the max # of cursors that one would expect based upon CPU & memory resources? I can't find anything in the documentation.
Thanks,
Chuck

There is an OPEN_CURSORS parameter in the init.ora file,
I want to know the impact of number of open cursors on performance
(ie., how many open cursors would be appropriate for an instance)There shouldn't be a performance issue here. The value needs to be set based on how many open cursors you want to allow simultaneously. If you set the value too low, applications will get the "too many cursors open" error when they try to open a new cursor. If you're not having problems, or if you don't know how many open cursors you're likely to have, I wouldn't change this parameter.
Justin

'number of open cursors exceeded' exception - 10.3.1

Hi All,
We have may DynamicSQL statements fired from our processes due to which we are getting 'number of open cursors exceeded' exception. We don't want to increase the limit of the maximum open cursors. Is there any way to close the cursors explicitly in 10.3.1?
I am aware that when the iterator fetches the last result the cursor gets closed (in the case of any select query) but we have faced the same issue once/twice in the insert query also, is it because we have fired one insert after the other immediately? How much time does a cursor takes to close (implicitly) in the case of insertion of data?
Thanks in advance..
Edited by: GBP on Jan 5, 2011 4:07 AM

Hi,
Please see my post: Re: Cursor closing using DynamicSQL.executeQuery
Hope this helps,
Ariel

How to get highest number of open cursors within the current calendar day

Hi all ,
i need to know how to get the highest number of open cursors within the current calendar day.
Thanks ,

823030 wrote:
the issue is my customer is getting the error ORA-01000: maximum open cursors exceeded and we need an sql statment that gets the following values :
-highest number of open cursors experienced in the current calendar day.
-current open cursors
-and maximum open cursorsThis error is rare. It happens when
a) the value of the open cursor parameter is set extremly low (default is something like 1000). Low would be something like 10.
b) <strike>you have many concurrent users(=sessions) and </strike>the application does not use bind values
In this case each select will open a new cursor, instead of reusing it.
c) you have a select that opens a cursor for each line. This can happen with a statement where you have the CURSOR keyword somewhere in the select or where clause. Those cursors will be closed when the select is finished. But during the run time of the select, all cursors stay open.
To track the number of "open cursors" during the day you would need to implement some monitoring. Maybe based on the view that was already mentioned.
Edited by: Sven W. on May 16, 2011 2:30 PM - since the parameter is on session level, other open cursors should not influence it much.

How to analyse the number of open cursors being used by each program?

Hi,
I am getting an error "ORA:1000 Maximum Open Cursors Exceeded" in my
application. I want to analyse and monitor that how many cursors are
being used by each program running in a particular session. I have
already set the Open Cursors Count double of the recommended for my
application, yet I am getting this error.
Is there any tool to analyse and monitor the number of cursors being
used by each DB call?
I have installed SAP NW 7.0 and Using Oracle 10g as DB.
Your immediate help will be greatly appreciated.
Best Regards,
Smriti.

You can list the open cursors per session and check which one uses the most with sqlplus:
SQL> select a.value, s.username, s.sid, s.serial#
from v$sesstat a, v$statname b, v$session s
where a.statistic# = b.statistic# and s.sid=a.sid
and b.name = 'opened cursors current';
Values over 300 are unusual.
It is quite possible, that you see several workprocesses using a lot, because workprocesses are kind of shared sessions.
Cheers Michael
Edit: ah, our posts crossed, obviously there is no workprocess in the java world

Question about trigger to check the number of open cursors

Hello.
I wonder if it is possible to create a trigger that fires when the number of open cursors in a database becomes larger than a certain number. What kind of trigger and how would it be?
If it were possible the trigger would write traces with the timestamp of the event.
I would also like some pl/sql tester that would increase the number of open cursors so that I could check the trigger.
Thanks in advance.

Satish Kandi wrote:
OPEN_CURSORS is a value per session and not for the entire database. So if your cron job is looking for a global cumulative value of open cursors to occur in a single session, it won't find any such sessions.
Is it the case?Yes, I am afraid it is.
I am sorry but I don't unsertand what you are telling me: doesn't "select count(*) from v$open_cursor" count the number of open cursor for all sid columns in the view?
The cron launches a scripts that connects to the database via sqlplus whereas there is a java application (several threads without connection pooling) that connects to the database via jdbc and that causes the problem once in 5 months (to say something).
Thanks again.
Edited by: fsanchezherrero on Jul 3, 2009 12:28 PM
Edited by: fsanchezherrero on Jul 3, 2009 12:36 PM

Number of open cursors

I'm working on debugging some code and trying to monitor some of things that are happening at runtime. One of the things that would be useful is if I could monitor the number of open cursors on a connection.
I've done my searching and can't seem to find anything of the sort Connection.getOpenCursorCount().... is there such a method or anything related?

There's nothing generic like this, every possible approach that I know of is implementation-specific, either Java-side or DB-side.
The Java-side approach is to attempt to track ResultSets through their life-cycle, as a rough proxy for cursors; this usually relies on wrapped RSs or a vendor-specific driver feature, and is sometimes not a good solution for running down certain types of resource leaks.
On the DB side, some DBs have some visibility into open cursors through some sort of vendor-specific API.
For example, on Oracle, there is the system view V$OPEN_CURSOR that can be queried for some information related to open cursors, often in conjuction with info ftom V$SESSION and V$SQL, V$SQL_AREA or V$SQL_TEXT. IMPORTANT NOTE: this view is actually a view on internal Oracle memory structures. While you can query it like any normal view or table, it is changing constantly, with internal per-row consistancy guaranteed by latches (locks on memory). Complex queries against internal views (such as self-joins or complex aggregations) can interact with the latches very badly; the queries may take many hours to complete and consume massive amounts of CPU while doing so. If you need to perform a complex analysis, don't do it on the live view; create a snapshot of the view and use that, for example:
CREATE TABLE SNAP_OPEN_CURSORS as
SELECT * FROM V$OPEN_CURSORS(Note that in a RAC or OPS Oracle cluster, the V$ views only report on the instance you're connected to; there are analogous GV$ views that report on all available instances, and have an added INST_ID column identifying the source instance, when relevant).

Increased maximum number of open cursors

I'm using JDBC with oracle. And I need to send many transactions to database.
I use Statement.executeQuery("INSERT INTO ..............") and so on!
But after 300 transaction Oracle send me an error that "increased maximum number of open cursors." How to increase the max number of that cursors or how to close them??
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How to get number of open cursors per connection?

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