The error:maximum open cursors exceeded,how to resolve it??

the parameter is as following in oracle: open_cursors=300
i write the following two methos get data from oracle db,after invote the methods many times,the program thrwos the exception named "maximum open cursors exceeded";why?how to resolve it?
in my program ,i have closed the statment and resultset!
the following is the code,and method a call mehtod b:
mehtod a:
//modeify the product and call mothod b
public boolean modifyDVBProd(Integer prodIDInt,ProdRequestEn prod)
boolean successB=false;
Connection conn=...;
if(conn!=null)
try
conn.setAutoCommit(false);
//the following call method b
successB=ProdOperateBL.getInstance().modifyDVBProd(conn,prodIDInt,prod);
if(successB)
conn.commit();
else
conn.rollback();
catch(Exception e)
successB=false;
try
conn.rollback();
catch(Exception ex)
ex.printStackTrace();
e.printStackTrace();
finally
try
conn.setAutoCommit(true);
catch (SQLException ex)
ex.printStackTrace();
else
successB=false;
return successB;
method b;��
//modify products
public boolean modifyDVBProd(Connection conn,Integer prodIDInt,ProdRequestEn prod)
boolean successB=false;
String sqlPriceStr="UPDATE pricemodelen pm SET pm.rentpricf=? WHERE pm.priceidl=(SELECT p.priceidl FROM producten p WHERE p.productidl=?)";
String sqlProdStr="UPDATE producten p set pronamestr=?,prod_type=?,unidstr=?,catype_name=?,casid=?,entitle_code=?,validfrdt=?,validtodt=?,descstr=? WHERE P.productidl=?";
String sqlProd_channelDelStr="DELETE FROM proden_channelen c WHERE c.productidl=?";
String sqlProd_channelInsertStr="INSERT INTO proden_channelen(productidl,channel_id) VALUES(?,?)";
PreparedStatement pstmt1=null;
PreparedStatement pstmt2=null;
PreparedStatement pstmt3=null;
PreparedStatement pstmt4=null;
int paramIndexInt=1;
try
//price
pstmt1=conn.prepareStatement(sqlPriceStr);
pstmt1.setDouble(paramIndexInt++,prod.getProdPriceD());
pstmt1.setDouble(paramIndexInt++,prodIDInt.intValue());
int priceResult=pstmt1.executeUpdate();
//product
pstmt2=conn.prepareStatement(sqlProdStr);
paramIndexInt=1;
pstmt2.setString(paramIndexInt++,prod.getProdNameStr()); //product name
pstmt2.setInt(paramIndexInt++,prod.getProdTpInt());//product type
pstmt2.setString(paramIndexInt++,prod.getPriceUnitStr());//unit
pstmt2.setString(paramIndexInt++,prod.getCaTpStr());//type
pstmt2.setInt(paramIndexInt++,prod.getCasidInt());//casid
pstmt2.setString(paramIndexInt++,prod.getCaEntitleCodeStr());//caentitlecode
pstmt2.setDate(paramIndexInt++,prod.getValidBeginDate());//time
pstmt2.setDate(paramIndexInt++,prod.getValidEndDate());//time
pstmt2.setString(paramIndexInt++,prod.getProMemoStr());//memo
pstmt2.setInt(paramIndexInt++,prodIDInt.intValue());//id
int prodResult=pstmt2.executeUpdate();//
pstmt3=conn.prepareStatement(sqlProd_channelDelStr);
pstmt3.setInt(1,prodIDInt.intValue());
pstmt3.executeUpdate();
int channelResult=0;
for(int i=0;i<prod.getChannelIDsInt().length;i++)
pstmt4=conn.prepareStatement(sqlProd_channelInsertStr);
pstmt4.setInt(1,prodIDInt.intValue());
pstmt4.setInt(2,prod.getChannelIDsInt());
pstmt4.addBatch();
pstmt4.executeBatch();
//((OraclePreparedStatement)pstmt).sendBatch(); // JDBC sends the queued request
if((prodResult>0)&&(priceResult>0))
successB=true;
catch(Exception ex)
successB=false;
ex.printStackTrace();
finally
//closing the preparedstatement
try
if(pstmt1!=null)
pstmt1.close();
if(pstmt2!=null)
pstmt2.close();
if(pstmt3!=null)
pstmt3.close();
if(pstmt4!=null)
pstmt4.close();
catch (SQLException ex)
ex.printStackTrace();
return successB;

Check this loop.
or(int i=0;i<prod.getChannelIDsInt().length;i++)
pstmt4=conn.prepareStatement(sqlProd_channelInsertStr);
pstmt4.setInt(1,prodIDInt.intValue());
pstmt4.setInt(2,prod.getChannelIDsInt());
pstmt4.addBatch();
Here every time the loop executes, a new statement object is created and assigned to the same statement object reference pstmt4. So finally when u r closing the stmt objects, only one stmt object gets closed out of prod.getChannelIDsInt().length that gets created with in the loop.

Similar Messages

How to resolve the issue of ORA-01000: maximum open cursors exceeded

Hi all,
I'm new to Oracle, currently I write a simple java class to retrieve records form Oracle DB, but following error occurs:
java.sql.SQLException: ORA-01000: maximum open cursors exceeded
String sql = "select * from......";
prepStmt = conn.prepareStatement(sql);
prepStmt.setString(1, this.getId());
rlt = prepStmt.executeQuery();
while (rlt.next()) {
try {
     rlt.getString("severity");
rlt.getTimestamp("time_stamp");
violationList.add(viol);
} catch (Exception e) {
When there are only few records in the table, it is ok, but if the result is large, occur the exception.
Why and how to resolve?
Thanks.
Jane

It is better to close statement using try...catch...finally , e.g.
PreparedStatement objStmt = null;
try
     objStmt = conn.prepareStatement(...);
     // ... do anything
catch (Exception e)
     // ... exception handling
finally
     // another try...catch block to handle exception during statement close
     try {   objStmt.close();   }     catch (Exception e) {   }
     objStmt = null;
This would guarantee that statment object is being closed even though exception is thrown. (Don't wait for connection release by garbage collector)

ORA-01000: maximum open cursors exceeded--Error

Hi
What is "ORA-01000: maximum open cursors exceeded" error,How to solve.
Thanks
Miseba

Hi
ORA-01000: maximum open cursors exceeded
Other terms
Oracle, open cursors, exchange infrastructure
Reason and Prerequisites
The parameter "open_cursors" is set too low. Long transactions, such as imports, may use up all available cursors and fail.
Solution :
THIS NOTE APPLIES TO XI 3.0 SP2 ONLY **
if you encounter an exception that reports "ORA-01000: maximum open cursors exceeded" please adjust the open_cursors parameter as follows:
If the BR*Tools exist on your system:
1] directory: /usr/sap/<SID>/SYS/exe/run
2] "brspace -c force -f dbparam -a change -p open_cursors -v 100000"
3] directory: $ORACLE_HOME/dbs (Unix) or %ORACLE_HOME%/database (Win)
4] change open_cursors parameter in init<SID>.ora to 100000
If the BR*Tools are not available (2] above - command not found)
1] change the open_cursors parameter as in 4] above
2] restart DB, for changes to take effect. _ NOTE: This problem has been fixed with XI 3.0 SP3 (see note 735078)
Plz asign points if helpfull.
Regards
Padmanabha

Getting error ora-01000 maximum open cursors exceeded

hello,
i am building my fist application using eclipse3.3 hibernate 3.2(hybernatesynchronizer as plugin)
i have a oracle9i like sgbd . when i trying to create my mapping file from eclipse i got this error :
ORA-01000: maximum open cursors exceeded
i try to increase the number of cursor from the oracleconfiguration file init.ora, i shutdown but the problem still
i don t know how to solve this problem really.
i need help.

Yes, that it what I was asking about.Not that it matters, but I think you misunderstood. I meant "if you ask it to leak resources then it will do so." I wasn't asking what you meant.
Is there a way to make it explicitly open and close via a single call? Perhaps a configuration option either globably or by method/class?Not as a standard part of Hibernate, no. That said, it's relatively hard to leak anything other than connection objects unless you're really trying hard. There are libraries that you can use to manage the lifetime of the connection (actually the session) object. I like the Spring DAO support classes. Inevitably they cause their own problems for someone who doesn't understand what Hibernate's up to under the covers though.
Edit: Quick example
// Bog standard Hibernate
Session session = sessionFactory.openSession();
try {
return (List<Foo>)session.createQuery("from Foo").list();
} finally {
session.close(); // If omitted will leak a connection object
// Using Spring
return (List<Foo>)getHibernateTemplate().find("from Foo");Things get slightly more interesting if you're using lazy loading and actively want to keep the connection around for longer.

Error ORA-01000: maximum open cursors exceeded

Why Oracle return this error. When I change the OPEN_CURSORS in init.ora from 100 to 1000 without this error.
I want to keep Minimum cursors value. How can I change the Java program ?
96 er_write_asp('W349','HK','50112','USD',3.99)
97 er_write_asp('W349','HK','10112','USD',5.22)
98 er_write_asp('W349','HK','60112','EUR',13.07)
99 er_write_asp('W349','HK','50112','USD',3.9)
100 er_write_asp('W349','HK','40112','USD',5.65)
101 er_write_asp('W349','HK','90112','USD',2.75)
java.sql.SQLException: ORA-01000: maximum open cursors exceeded
ORA-06512: at "POSTCAL.ER_WRITE_ASP", line 10
ORA-06512: at line 1
java Program list.
     eric.leung 2003/12/02
     set CLASSPATH include C:\Oracle\Ora81\jdbc\lib\classes12.zip
     Purpose
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import java.io.*;
import java.util.StringTokenizer;
import java.sql.*;
import java.lang.*;
import java.math.BigDecimal;
import java.util.Date;
public class writeASP {
// Login Information
static String user = "x";
static String passwd = "x";
static String ip = "x";
static String getfile = "c:\\temp\\asp.csv";
public static void main(String[] args) throws IOException {
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     int i = 0;
     int cnt = 0;
     int port = 0;
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     String query = "";
     String strone = "";
     String arry[] = {"","","","","","","","","","","","","","",
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                    quote(arry[1],',') +
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               cs.setString(2,arry[1]);
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          + g[2] + " " + g[3] + " " + g[4] + " "
          + g[5] + " " + g[6] + " " + g[7] + " "
          + g[8] );
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     return "'" + s + "'";
private static String quote(String s,char j)
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Don't create a new callable statement each pass through the loop. Create it outside the loop and set the parameters & exec inside the loop. Close the resultset each time. Close statement after loop.

In java/jsp got Error,ORA-01000: maximum open cursors exceeded,

Dear ALL,
We are facing a problem of in java/jsp. ORA-01000: maximum open cursors exceeded,We are using referance Cursor for returing the Record in java file.
The Code is given below.
import java.sql.*;
import javax.sql.*;
import com.india.trade.dbConnection.*;
import oracle.jdbc.driver.*;
import java.util.Vector ;
public class IntRmsActivity
     private static JDBCConnection instance = null;
private static Connection con = null;
     private static CallableStatement stmt_admin_getadmins = null;
     private static String str_admin_getadmins = "{ call Admin_conf.RMS_ADMIN_GETALLADMINS(?,?) }";
     static
          try
               instance = new JDBCConnection();
               con = instance.getConnection();
               stmt_admin_getadmins = con.prepareCall(str_admin_getadmins);
}catch(Exception se){se.printStackTrace();}
     public static Vector admin_getAdmins() throws Exception
          checkconnection();
          String message = null;
          Vector v_admins = new Vector();
          ResultSet rs_admins = null;
          stmt_admin_getadmins.registerOutParameter(1 , OracleTypes.CURSOR);
          stmt_admin_getadmins.registerOutParameter(2 , Types.VARCHAR);
          stmt_admin_getadmins.execute();
          message = stmt_admin_getadmins.getString(2);
          System.out.println("message " + message);
          rs_admins = ((OracleCallableStatement)stmt_admin_getadmins).getCursor(1);
          while (rs_admins.next())
                    v_admins.addElement(rs_admins.getString("adminid"));
          rs_admins.close();
          return v_admins;
CREATE OR REPLACE PACKAGE Admin_conf IS
TYPE REF_CRSR IS REF CURSOR; /* OUTPUT CURSOR VARIABLE TYPE */
PROCEDURE RMS_ADMIN_GETALLADMINS(RESULTS OUT REF_CRSR,
                                        OUT_MESSAGE OUT VARCHAR2);
END Admin_conf;
CREATE OR REPLACE PACKAGE BODY Admin_conf
IS
PROCEDURE RMS_ADMIN_GETALLADMINS(RESULTS OUT REF_CRSR,
                                        OUT_MESSAGE OUT VARCHAR2)
IS
l_ref_out_crsr REF_CRSR;
BEGIN
     OPEN l_ref_out_crsr FOR
     SELECT EXECUTIVE_ID adminid
     FROM MASTER_EXECUTIVE_ID
     ORDER BY EXECUTIVE_ID;
     OUT_MESSAGE := 'ADMIN IDS FETCHED SUCCESSFULLY';
     RESULTS := l_ref_out_crsr;
EXCEPTION WHEN OTHERS THEN
          OUT_MESSAGE := 'ERROR ' || SUBSTR(SQLERRM, 1, 60);
END RMS_ADMIN_GETALLADMINS;
END Admin_conf;
Regards
Ajay Singh Rathod

Are you actually closing the connections, resultsets in all cases?
From what you've posted you call
rs_admins.close();but in that method, you propagate any exceptions that occur out to the caller method, which in turn just prints a stack trace.
So if an exception occurs before you call the rs_admin.close() the result set will never be closed as the statement won't be reached.
I'd add a speific exception handling routine to the admin_getAdmins() method and include a finally clause to close the result set in all cases. You can still onthrow the exception if you want.
cheers
-steve-

Error During Delete Of Application:ORA-01000: maximum open cursors exceeded

Hello All.
I am using Apex version 3.2.0.00.27. I am trying to delete an existing application (App_ID 116). I am continually getting ORA-01000: maximum open cursors exceeded.
Prior to deleting this application, I attempted to, instead, import (that is, replace) this app with a previously saved Apex app (APP_ID 116). This previously saved app is also at the same version. I get the same error. At that point, I figured that I would delete the app and then import my previously saved app, only to get the same error.
I then attempted to import the previously saved app as a new APP_ID (256). This time, the app imported without error.
Does anyone know what is going on? Could it be that my existing app 116 is "corrupted" (whatever that means)? Why can't I delete or import over my existing app 116?
Any help would be appreciated.
Thank you.
Elie

Post Author: amr_foci
CA Forum: Information OnDemand
its a database related Error and it can be fixed
please check this link
http://publib.boulder.ibm.com/infocenter/wasinfo/v4r0/index.jsp?topic=/com.ibm.support.was.doc/html/EJB_Container/1040875.html
good luck
Amr

JDBC Error: ORA-01000: maximum open cursors exceeded

Post Author: prashant
CA Forum: Information OnDemand
I successfully created reports using CR4E on windows, deployed JSPS to Websphere running on windows and was able to view a large reports for a using JNDI connection resources to Oracle 10g.
Every time report is called, it consume 12 cursors from of the database. Open_cursors count is 300. After 24 or 25 iteration of this report, it throws ORA-01000: maximum open cursors exceeded error.
Has anyone seen this problem, and if so where can I find a hot fix/patch. Any help would very much be appreciated.

The following code reproduces the problem for me. I thought this was just related to when an exception occurs, and close occurs immediately afterwards. Close finds the exception that occured, and throws it without releasing the resources.
It's a pain in the ass, that's for sure.
public void go() {
try{
long startTime = System.currentTimeMillis();
String sql = "Select number_7_0__, char_10__, varchar_5__, varchar2_10__, number_10_5__, float_126__, date_, clob_, blob_ FROM lotsofrows";
Properties connectProps = new Properties();
Driver drv = new oracle.jdbc.driver.OracleDriver();
connectProps.put("user", "borg");
connectProps.put("catalog", "test");
connectProps.put("password", "borgborg");
Connection conn = drv.connect("jdbc:oracle:thin:@142.176.134.166:1521:test", connectProps);
int cnt = 0;
while (true) {
try {
System.out.print("\nTest " + ++cnt + " ");
Statement stmt = conn.createStatement();
System.out.print("execute ");
ResultSet rs = stmt.executeQuery(sql);
System.out.print("cancel ");
stmt.cancel();
try {
System.out.print("close.");
stmt.close();
} catch (SQLException se) {
if (se.getMessage().indexOf("requested cancel") != -1) {
System.out.print("URC:Close");
try {
stmt.close();
} catch (Exception ee) {
System.out.println(ee.getMessage());
ee.printStackTrace();
} else {
throw se;
stmt = null;
}catch(Exception se) {
System.out.println(se.getMessage());
se.printStackTrace();
}catch(Exception e) {
System.out.println(e.getMessage());
e.printStackTrace();
null

Maximum open cursors exceeded!!!

Hi All,
While executing a procedure am getting this error:
Error: ORA-00604: error occurred at recursive SQL level 1
ORA-01000: maximum open cursors exceeded
Could you please guide me how to get rid of this kind of error and how to close all open cursors together.
Thanks in Advance
AP

am running a procedure on sqldeveloper and i think statement which is causing problem is:
RLD is cursor
in the procedure am checking
open rld;
if RLD%found then
begin
end;
end if;
close rld;
if i comment IF CONDITION then procedure works fine..

Maximum Open Cursors Exceeded - Oracle & Java

I am using NetBeans ( Forte 5) for developing an application with Oracle Database. My application makes use of executeUpdate, executeQuery statements inorder to access Database.
After few insertions and deletions of data through the host language( Java), my application stops working. It gives out the error.
java.sql.SQLException: ORA-01000: maximum open cursors exceeded[/b
Is this the problem with Forte or Oracle. I am using Oracle in a network in which i have got a tablespace in the Database server.
How to tackle this problem.

I am using 3 methods preparedStatements
1. execute - returns boolean
2. executeQuery - returns ResultSet
3. executeUpdate - returns int
I am closing the ResultSet object returned by executeQuery using
close() method.
Is this the correct way to close the open cursor.
I access the table attributes using a rs.getString(colNum) and
rs.getInt(colNum)
Even then i am getting the maximum open cursors exceeded message.
Will Oracle open a cursor for execute and executeUpdate which is not returning a ResultSet object .
If Oracle opens a cursor for these two methods, how should i close the open cursor.

ORA-01000 maximum open cursors exceeded with XA driver

We are getting ORA-01000 maximum open cursors exceeded error from Oracle database
agian and again.We are usimg XA driver.
What is the weblogic's work around to handle this error?How we can handle this?We
tried doing "grant select on DBA_PENDING_TRANSACTIONS to public ;" ,this also
works for some time only.Again the same error starts coming.
Help please.
Thanx in advance.

Thanks for your reply.
I have increased my cursor size to 2000(default 300).We are using weblogic6.1
and Oracle9i.Yes I was little aware about this bug so I tried doing "grant select
on DBA_PENDING_TRANSACTIONS to public " from sys and no of open cursors reduced
drastically but aftter some time increased again.We are using combination of thin,XA,non
XA and oci drivers.
We are using weblogic security framework also in our application and I think that
consumes maximum no. of cursors.
Kindly advice.
Thanx a lot.
Pinky
Mitesh Patel <[email protected]> wrote:
What is the size of cusror set in your oracle init.ora file?
What version of oracle thin driver and weblogic are you using?
Please read the following note:
There is a bug with Oracle 817 driver's XAResource.recover implementation:
it
ignores the flag and always return all in-doubt Xids. After initially
calling a resource's recover with TMSTARTRSCAN, TM subsequently calls
the
resource's recover with TMNOFLAGS until no more Xid is returned. Thus,
Oracle driver's XAResource.recover is called infinitely until eventually
it
returns XAER_RMERR. Subsequent XAResource.start then returns ORA-01000
exception (looks like all their XAResource methods internally uses prepared
statements to execute some stored procedure.)
Is this the case wth you?
Mitesh
Pinky Arora wrote:
We are getting ORA-01000 maximum open cursors exceeded error from Oracledatabase
agian and again.We are usimg XA driver.
What is the weblogic's work around to handle this error?How we canhandle this?We
tried doing "grant select on DBA_PENDING_TRANSACTIONS to public ;",this also
works for some time only.Again the same error starts coming.
Help please.
Thanx in advance.

ORA-01000: maximum open cursors exceeded (please help / JDBC guru needed)

ORA-01000: maximum open cursors exceeded
I am getting this error when trying to execute 2,500 Sql DDL statements. I am executing the statement with:
public boolean execute(String sql) ( like stmt.execute(sql); )
After each execute() I close the statement ( like stmt.close() )
I tried taking this a step further and decided to close and reopen the database connection after every 100 Sql statements processed and I still get this exception when continuing.
ORA-01000: maximum open cursors exceeded
Any help will be greatly appreciated. I need to figure how to close the cursors or how to finish processing all 2,500 statements. I do not have control over the init.ora file and can not increase the max cursors. I hope to figure out how to close the cursors so that no tweaking of the init.ora file is needed.
ChrisTD

Why dont you allocate dukes for this problem ???
am getting this error when trying to execute 2,500 Sql DDL statements. I am executing the statement with:
public boolean execute(String sql) ( like stmt.execute(sql); )
After each execute() I close the statement ( like stmt.close() )
What kind of DDL is that? are you using any cursor operations to fetch the data? What kind of query does this sql parameter contain?
Look there is only 3 solutions for this kind of problem.
1) shutdown the database and restart it.
I dont think closing connection will shutdown the database as you
told.
2) shutdown the database access init.ora and increase the
OPEN_CURSORS and then restart it.
You told that you dont have access to init.ora.
3) close every cursor that you open.(Probably you are not closing the cursor once you fetch the data).

Oracle and "Maximum open cursors exceeded"

Hi,
I am using Weblogic 7.0sp2 with Oracle 9.2.0. Since we are using manual JTA
transactions and the 9.2 drivers are buggy in that respect, we are using the
9.0.1 thin drivers delivered with weblogic.
The problem I have is that after a while, we get the now classic "Maximum open
cursors exceeded" error on connections from our connection pool (used through
a
TX datasource). I have of course checked all our JDBC code and it is fine. We
do not leave any statement/connection open. In fact, I am certain that the
problem is not caused by our applicative code.
The reason I am so positive is that the numbers of open (cached) cursors is
growing, even though there is no activity on our application (I mean no
activity at all). The number of cursors is regurlarly increasing by one
every 5 minutes until it reaches the maximum allowed for a session.
I have listed the statements corresponding to the opened cursors (they
do not belong to our code, as you might have guessed):
SELECT sysdate, user from dual
select longdbcs from javasnm$ where short = :1
select longname from javasnm$ where short = :1
As you can see, there are only three different statements. You can get
the statements from the system view v$open_cursor for a given session
but it will only give one row per different statement. If you want to know
the # of opened cursors in your cursor, use v$sesstat with statistic# = 3
(opened cursor current).
I suspect something is wrong in the connection testing done by weblogic
for the pool (I have activated test on reserved connections and test table
name is "dual") that leaves a resultset/statement behind. What is weird
though is that the refresh period is still 0 (not 5 minutes as you would
expect from the cursor growth rate...).
I would not say that it is an Oracle bug (as stated in some BEA FAQ I read)
since our application JDBC code does not exhibit the same problem. The
problem appeared with recent version of WebLogic for which the session
cursor cache is enabled, I suppose for performance reasons - this
is set by isssuing "ALTER SESSION SET SESSION_CACHED_CURSORS = ...".
Talking about this, does anybody know to which value WebLogic sets this
parameter when intializing the connection (this is neither
documented/configurable)?
Up to now, I have come up with possibly two workarounds, neither of which
is satisfying:
- resetting the pool from time to time
- issuing "ALTER SESSION SET SESSION_CACHED_CURSORS = 0" when I get a
connection from the pool. I have not tested this one personally (read
in a newsgroup that someone else did successfully) but it is supposed
to reset the cursor cache that is causing the trouble.
Any help will be greatly appreciated,
Regards,
Thierry.

Thierry Rouget wrote:
Hi,
I am using Weblogic 7.0sp2 with Oracle 9.2.0. Since we are using manual JTA
transactions and the 9.2 drivers are buggy in that respect, we are using the
9.0.1 thin drivers delivered with weblogic.
The problem I have is that after a while, we get the now classic "Maximum open
cursors exceeded" error on connections from our connection pool (used through
a
TX datasource). I have of course checked all our JDBC code and it is fine. We
do not leave any statement/connection open. In fact, I am certain that the
problem is not caused by our applicative code.
The reason I am so positive is that the numbers of open (cached) cursors is
growing, even though there is no activity on our application (I mean no
activity at all). The number of cursors is regurlarly increasing by one
every 5 minutes until it reaches the maximum allowed for a session.
I have listed the statements corresponding to the opened cursors (they
do not belong to our code, as you might have guessed):
SELECT sysdate, user from dual
select longdbcs from javasnm$ where short = :1
select longname from javasnm$ where short = :1
As you can see, there are only three different statements. You can get
the statements from the system view v$open_cursor for a given session
but it will only give one row per different statement. If you want to know
the # of opened cursors in your cursor, use v$sesstat with statistic# = 3
(opened cursor current).
I suspect something is wrong in the connection testing done by weblogic
for the pool (I have activated test on reserved connections and test table
name is "dual") that leaves a resultset/statement behind. What is weird
though is that the refresh period is still 0 (not 5 minutes as you would
expect from the cursor growth rate...).
I would not say that it is an Oracle bug (as stated in some BEA FAQ I read)
since our application JDBC code does not exhibit the same problem. The
problem appeared with recent version of WebLogic for which the session
cursor cache is enabled, I suppose for performance reasons - this
is set by isssuing "ALTER SESSION SET SESSION_CACHED_CURSORS = ...".
Talking about this, does anybody know to which value WebLogic sets this
parameter when intializing the connection (this is neither
documented/configurable)?
Up to now, I have come up with possibly two workarounds, neither of which
is satisfying:
- resetting the pool from time to time
- issuing "ALTER SESSION SET SESSION_CACHED_CURSORS = 0" when I get a
connection from the pool. I have not tested this one personally (read
in a newsgroup that someone else did successfully) but it is supposed
to reset the cursor cache that is causing the trouble.
Any help will be greatly appreciated,
Regards,
Thierry.Hi. We don't make those queries either. I suspect they are internal to the
oracle driver. One thing you can try is to set the size of the pool's
statement cache to zero. Oracle will retain cursors for every statement we
cache. The alternative is also to tell the DBMS to allow a given session
more cursors.
Joe

More on "maximum open cursors exceeded"

It seems a lot of people have been seeing this error message, but reading through the posts on the topic hasn't given me any new insight on the problem. Here's an account of my particular situation:
I am using the XSQL servlet, v.1.0.0.0 with the thin jdbc driver v.1.x. The servlet is running within an Apache server (1.3.12) on a Linux box, and the Oracle database (8.1.5) is located on a Solaris 2.6 machine.
The servlet accepts HTTP connections, performs the corresponding SQL queries and returns the output from the database to the HTTP client. Here's a simple example:
(Sorry about potential bad line breaks.)
client request:
% telnet xsql-host.some.domain 80
Trying xxx.xxx.xxx.xxx
Connected to xsql-host.some.domain.
GET /xsql/test/listall.xsql
<server response here>
listall.xsql:
<?xml version="1.0"?>
<page connection="boss" xmlns:xsql="urn:oracle-xsql">
<accounts>
<xsql:query tag-case="lower" rowset-element="" row-element="accountinfo">
select * from test
</xsql:query>
</accounts>
</page>
Very simple stuff indeed. Now, this has worked perfectly for 3 weeks or so. During this period, the xsql servlet has been stopped and restarted numerous times and the machine hosting the database has been rebooted at least three times. Then, for no apparent reason (as nothing had changed in the setup described above), I started getting "maximum open cursors exceeded" on every request. Since then, I have been unable to get the system working as it had up until now. I haven't restarted the database and I would like to avoid doing so, because that would not be a valid solution for us if the problem reappeared in production. The maximum open cursors setting in Oracle should be correct, since things were running smoothly before.
From what I can see, the problem could be with the servlet not closing its cursors. One post mentioned that it did, but I would appreciate it if this could be double-checked. Considering the database is the only portion of the system which has been kept running for extended periods of time, it seems to me that this might indeed be the problem.
Confirmation, workarounds, suggestions, patches, or a consolation box of chocolates would all be appreciated.
Thanks,
- Fad
([email protected])
null

Check which process is making all the cursors on which database. If it is your procedure, try explicitly closing the cursors. I think the cursors are only implicitely closed after the transaction is ended. If you loop and open a cursor within the loop, that might be the problem.
I also had this problem with Java working over a JDBC connection some time ago on a 815 database. If I recall correctly, that was caused by the JDBC driver and fixed by replacing it with a JDBC driver of 9i.
The following script is what I used previously in a program that can draw a graph from the results. It is ugly, but does the job.
Hope this helps,
L.
select
'max cursors',
to_number(value)
from
v$parameter
where
name = 'open_cursors'
union
select
substr(lower(username),1,10)||'('||substr(to_char(ses.sid)||','
||to_char(serial#),1,9)||')',
s.value
from
v$sesstat s,
v$statname n,
v$session ses
where
s.statistic#=n.statistic#
and ses.sid=s.sid
and n.name like '%cursor%'
and n.name like '%current%'
and not (ses.sid between 1 and 6)

Maximum open cursors exceeded with Sybase TG

Hi,
Does anyone knows if we can use the HS_OPEN_CURSORS with Oracle transparent gateway for Sybase ?
I've got the error message :
ORA-01000: maximum open cursors exceeded
Thanks

This depends if the maximum number of cursors exceeded in the GTW or within the db.
In my eyes the OPEN_CURSORS of the db is normally the limiting factor.
HS_OPEN_CURSORS defines the maximum number of cursors that can be open on one connection to a non-Oracle system instance.
The value never exceeds the number of open cursors in the Oracle database server. Therefore, setting the same value as the OPEN_CURSORS initialization parameter in the Oracle database server is recommended.
So better check out the OPEN_CURSORS of the db and increase them.

The error:maximum open cursors exceeded,how to resolve it??

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