Startup class for prepared statement cache

Hi
we are using weblogic 7.0 sp1 . As clearcacheparamters method is not available
with this version ,we have written a startup class to cache the preparedstaments
that we need ,even then these statements are not getting cached .we have observed
the oracle trace,it is parsing the prepared statement each time we make a call.Can
anyone clarify where iam doing wrong and suggest me a way to cache the prepared
statements we wanted.
my sample startup class looks like this
Collection connections = new ArrayList();
int conCount = 0;
Connection con =null;
PreparedStatement prep1=null;
PreparedStatement prep2=null;
PreparedStatement prep3=null;
while(true)
try
con = SQLConnection.getConnection();
connections.add(con);
prep1 = con.prepareStatement(sql1);
prep2 = con.prepareStatement(sql2);
prep 3 = con.prepareStatement(sql3);
conCount++;
catch (SQLException e)
System.out.println("exception SQLException "+e.getMessage());
break;
catch (IOException e)
System.out.println("******StartUp Connections got ---> "+conCount);
try
Iterator connectionIt = connections.iterator();
while(connectionIt.hasNext())
con = (Connection) connectionIt.next();
con.close();
catch (SQLException e)
we cant upgrade to sp3 immediately ,so please provide a solution for weblogic
7.0 sp1.
Thanks & Regards
Ranga

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How to retrieve a prepared statement from prepared statement cache?

Hi All,
I have created the connection pool during application server startup. The connection pool are getting created successfully. I have also created the prepared statements and stored as part of each connection in the connection pool.
can anyone please tell me on how do I retrieve a prepared statement from prepared statement cache from a connection object.
Any pointers to info source will be REALLY appreciated.
Many Thanks in Advance,
C R Baradwaj

Raghuram Bharatwaj C wrote:
Hi Joe,
I have created a connection poool in my startup class and created the
neccessary prepared statements for a each connection. I have 10 prepared
statements to be created for each connection. I have created all the 10 prepared statements using the loop as mentioned below
String [] epc_stmts;
private java.sql.PreparedStatement[] _pstmts;
if (epc_stmts!= null)
               _pstmts = new PreparedStatement [len = epc_stmts.length];
               for (i=0; i<len; i++)
                    _pstmts[i] = db.prepareStatement (epcstmts);
I have closed the connection after the prepared statements are created.
Now, How do i access a prepared statement from the connection object.
Nothing. Are you talking about a WebLogic pool? If so, then therafter,
whenever your application gets a pool connection, when it calls
prepareStatement() with the same SQL as you prepared those statements,
it will get a cached statement. Your array is unnecessary.
Joe
>
Many Thanks in Advance,
C R Baradwaj

Prepared statement cache & Oracle

Hi -
Does Weblogic's prepared statement caching only work when using their
type-2 Oracle driver? Are there any documents about using this
Weblogic feature? I have only found small references in the Weblogic
documentation so far -- nothing with much detail.
Thanks for any help,
- Mark

"Joseph Weinstein" <[email protected]> wrote in message
news:[email protected]..
>
>
Mark Cassidy wrote:
Hi -
Does Weblogic's prepared statement caching only work when using their
type-2 Oracle driver?No. It is generic to JDBC. Any JDBC driver should allow re-use ofPreparedStatements,
and our pool will cache for any driver.
Are there any documents about using this
Weblogic feature? I have only found small references in the Weblogic
documentation so far -- nothing with much detail.You are correct that there is too little documentation at this time.
Thanks for any help,
- Mark
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Do you know if each connection's cache is FIFO? Or do you use
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I found one comment you made regarding XA pools. That means that if we are
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- Mark

Jboss getting SQLException: Closed Statement prepared-statement- cache-size

My first post in this forum , hope to get a quick resolution :)
I am using Jboss 4.0.0 on Oracle 9.2.0.4.0
In order to improve the app performance , I had specified prepared-statement-cache-size as 50 as follows ,
<datasources>
<local-tx-datasource>
<jndi-name>jdbc/sct</jndi-name> <connection-url>jdbc:oracle:thin:@confidential:1560:sct1</connection-url>
<user-name>Confidential</user-name>
<password>Confidential</password>
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<new-connection-sql>select sysdate from dual</new-connection-sql>
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     at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:222)
     at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:285)
     at oracle.jdbc.driver.OracleStatement.ensureOpen(OracleStatement.java:5681)
     at oracle.jdbc.driver.OraclePreparedStatement.executeUpdate(OraclePreparedStatement.j ava:409)
     at oracle.jdbc.driver.OraclePreparedStatement.executeQuery(OraclePreparedStatement.ja va:366)
     at org.jboss.resource.adapter.jdbc.CachedPreparedStatement.executeQuery(CachedPrepare dStatement.java:57)
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Thanks in Advance
Bhavin

Hello,
I am also facing the same error: somewhere just now I read,
We were getting this error on JBoss / Oracle. The fix was setting the following to 0 in oracle-ds.xml:
<prepared-statement-cache-size>0</prepared-statement-cache-size>
Ref: http://www.jpox.org/servlet/forum/viewthread?thread=1108
May be you can try this, I am also still finding the solution, I will try the above and let u know, if i get success.
Regards,
Rajesh

XML SQL format for Prepared statements in batch mode

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Clustering Weblogic? You're either using Coherence, or you should be!
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select * from tbl_PreServiceManager where (trunc(Activation_Date+30)<trunc(Sysdate) or counter > 0) and CPS<>'FDE'";{code}
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datepart (dp):
dd -> day         -> 1-31
dy -> day of year -> 1-366
hh -> hour        -> 0-23
mi -> minute      -> 0-59
mm -> month       -> 1-12
qq -> quarter     -> 1-4
ss -> second      -> 0-59
ms -> millisecond -> 0-999
wk -> week        -> 0-53
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Ivaylo Zlatev <[email protected]> wrote:
I am using WL6.0SP2 on solaris.
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the DTD.
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should try to turn the cache off.
"leonardo" <[email protected]> wrote in message
news:40b1bb75$1@mktnews1...
>
>
Hi all,
while using some dinamyc store procedures I get in the following error:
[BEA][SQLServer JDBC Driver]Value can not be converted to requested type.
I'm using WL8.1 and Sql Server 2000.
Store procedure contains two different queries where table name is a storeprocedure's
parameter.
The first time it works great, after that I always have this error:
Reading bea doc's I found
There may be other issues related to caching prepared statements that arenot
listed here. If you see errors in your system related to preparedstatements,
you should set the prepared statement cache size to 0, which turns offprepared
statement caching, to test if the problem is caused by caching preparedstatements.
If I set prepared statement cache size to 0 everything works great butthat does
not seem the better way.
Should we expect Bea to solve this problem?
Or whatever else solution?
such as using JDBCConnectionPoolMBean.setPreparedStatementCacheSize()
dynamically ?
thks in advance
Leonardo

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We are using MDBs as message consumers but have to guarantee the order of
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supposed to proceed with processing or to discard any incoming messages).
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CK

this seems like a bug. the mbeanhome should be available for lookup in
startup classes. also posting to system management newsgroup.
"Carsten Kaiser" <[email protected]> wrote in message
news:[email protected]..
Hello,
we have the following problem: How to initialize our application
correctly???
We are using MDBs as message consumers but have to guarantee the order of
incoming
messages. Due to a shortcoming in the JMS implementation (Order of
redelivered messages
is not guaranteed before WLS 8.1!!!) we are using a singleton class tokeep
the health state
of the different message queues within the application (controllingwhether
the MDBs are
supposed to proceed with processing or to discard any incoming messages).
Thus the MDBs
have to access this singleton, what implies latter has to be initialized
prior to the application
deployment. That's what we are using a startup class for, which is markedto
be loaded before
appplication deployment...
Fortunately the according bug is fixed with WLS 7.0.2.0, so the class is
loaded, but we are
not able to access the MBeanHome interface (We like to register MBean to
provide
adminstrative access to the health state)!!!
javax.naming.NameNotFoundException: Unable to resolve
'weblogic.management.home.localhome' Resolved: 'weblogic.management'
Unresolved:'home' ; remaining name 'home.localhome'
at weblogic.rmi.internal.ServerRequest.sendReceive(ServerRequest.java:174)
So when is the MBeanServer started???
Before application deployment??? After??? Is there any way to tell WLS not
to load the startup
class before the MBeanServer is available respectively the MBeanHome is
accessible via JNDI
but before application deployment???
Any hints are welcome!!!
Regards,
CK

Prepared Statement Flooding

Hi Friends,
Need your help to fix this prolonging problem in one of our applications. We observe that the following queries are declared as prepared statements but have dynamic value ROWID in each.
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This results in a FLOOD of prepared statements (over 3000) as it is an application with a very large DB.
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Has anybody faced similar issue before?
Ideally the 10g jar file should eb backward compatible but for some reason it is not for this particular problem.
Please can somebody help to get a solution for this problem. Do let me know if you need more information.
Thanks.

Poornima wrote:
Is the prepared statement cache common to all the Connection objects in the Connection Pool or is there a separate cache for each statement in the Connection Pool?There is a separate statement cache for each connection in the pool.
Joe

Weblogic and prepared statement

We had an odd situation in production. We had a situation where we would always get a ORA-00904 Invalid Column name when running the following bit of code (via the prepared statement):
               preparedStatement = con.prepareStatement("select * from KO_USER where GLOBAL_ID=?");
               preparedStatement.setInt(1,thisGlobalId);
               rs = preparedStatement.executeQuery();
But when we simply converted it to a regular statement, as below, it ran fine.
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Can anyone explain this behavior? We use prepared statements throughout our codebase and never had a problem with it before.
Thanks for any insight.
Sara

Poornima wrote:
Is the prepared statement cache common to all the Connection objects in the Connection Pool or is there a separate cache for each statement in the Connection Pool?There is a separate statement cache for each connection in the pool.
Joe

Error handling in prepared statement batch

Hi,
For a prepared statement batch, it is not possible to know which operation failed. ... You should always perform a ROLLBACK operation in this situation.
For a generic statement batch or callable statement batch, the update counts array is only a partial array containing the actual update counts up to the point of the error. ... You can either commit or roll back the successful operations in this situation, as you prefer.
-- http://otn.oracle.com/docs/products/oracle9i/doc_library/release2/java.920/a96654/oraperf.htm#1056233
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Best Regards,
Kevin Zhao

According to the Oracle docs these are not the only possible values:
Oracle9i JDBC Developer's Guide and Reference
Release 2 (9.2) chapter 12
Performance Extensions
"For a prepared statement batch, it is not possible to know which operation failed. The array has one element for each operation in the batch, and each element has a value of -3. According to the JDBC 2.0 specification, a value of -3 indicates that an operation did not complete successfully. In this case, it was presumably just one operation that actually failed, but because the JDBC driver does not know which operation that was, it labels all the batched operations as failures."
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Startup class for prepared statement cache

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