How to set isolation level for BMP

Hi.
We're trying to avoid the ORA-08177 by setting the isolation level in the weblogic-ejb-jar.xml
to READ_COMMITED
Still (looking in the jdbc.log) it seems that weblogic set the transaction isolation
level to SERIALIZABLE
The xml :
<weblogic-enterprise-bean>
<ejb-name>Account</ejb-name>
<caching-descriptor>
<max-beans-in-cache>100</max-beans-in-cache>
<idle-timeout-seconds>600</idle-timeout-seconds>
<cache-strategy>Read-Write</cache-strategy>
</caching-descriptor>
<persistence-descriptor>
<delay-updates-until-end-of-tx>true</delay-updates-until-end-of-tx>
<finders-call-ejbload>false</finders-call-ejbload>
</persistence-descriptor>
<clustering-descriptor>
<home-is-clusterable>false</home-is-clusterable>
<home-load-algorithm>round-robin</home-load-algorithm>
</clustering-descriptor>
<enable-call-by-reference>false</enable-call-by-reference>
<jndi-name>Account</jndi-name>
<transaction-isolation>
<isolation-level>TRANSACTION_READ_COMMITTED</isolation-level>
<method><ejb-name>Account</ejb-name><method-name>*</method-name></method>
</transaction-isolation>
</weblogic-enterprise-bean>
Regards

When I marked all the beans with READ_COMMITED it works.

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C How to Set Isolation Level in the Connection String

How to Set Isolation Level in the Connection String using the "Microsoft OLE DB Provider for DB2 Version 4.0"?
We are trying to move from Crystal Reporting that run against a IBM DB2 database on a mainfram to SSRS reporting and we have downloaded the "Microsoft OLE DB Provider for DB2 Version 4.0" and then worked with the DB2 Administrator to create the
Packages. We only have access to use the "Read Uncommitted ("MSUR001") package. We were able to connect and pull data before he removed access to the other packages, but after setting access the Connection keeps trying to use
the 'Cursor Stability (MSCS001)" package. How do we change the Default to the "Read Uncommitted ("MSUR001") package??? Since it is keeps defaulting to the the other package
we can't connect to do it in the T-SQL query, it has to be set at the Connection String level.

Hi Dannyboy1263,
According to your description, you want to set the Transaction Isolation Level in Connection String. Right?
In Reporting Services, the Connection String for OLE DB Connection can only contains Provider, Data Source and Initial Catalog. There's no property for setting Transaction Isolation Level in the Connection String. Based on my knowledge, we can
only set the Transaction Isolation Level at Query level or set it by using code (C#, VB, Java...) to call the property of Connection. So unfortunately your requirement can't be achieved currently.
Reference:
OLE DB Connection Type (SSRS)
Data Connections, Data Sources, and Connection Strings in Reporting Services
If you have any question, please feel free to ask.
Best Regards,
Simon Hou

How to set isolation level in EJB?

 How to set the isolation level(Container Manager or Bean Manager) in EJB. Thanks


For 5.1, look at:
 http://www.weblogic.com/docs51/classdocs/API_ejb/EJB_environment.html#107261
 7
 http://www.weblogic.com/docs51/classdocs/API_ejb/EJB_reference.html#1061916
 "marshalli" <[email protected]> wrote in message
 news:3a59546d$[email protected]..
 >
 > How to set the isolation level(Container Manager or Bean Manager) in EJB.
 Thanks
 >
 >

How to set transaction isolation level for a method in a Local Interface

 By reference at:
 http://e-docs.bea.com/wls/docs61/ejb/reference.html#1071267,
 the value for method-intf can only be "Remote" or "Home".
 My question is--
 How to set transaction isolation level for a method inside a Local Interface or
 Local_Home Interface?
 Thanks.
 Xing


I'd try 6.1SP2. I'm pretty sure this works now.
 -- Rob
 Xing wrote:
 > I tried "Local", but got an error when deploying the EJB jar, saying that only
 > "Remote" or "Home" is allowed.
 >
 > Any idea?
 >
 > Xing
 >
 > Rob Woollen <[email protected]> wrote:
 > >
 > >
 > >Use LocalHome or Local.
 > >
 > >-- Rob
 > >
 > >Xing wrote:
 > >
 > >> By reference at:
 > >> http://e-docs.bea.com/wls/docs61/ejb/reference.html#1071267,
 > >> the value for method-intf can only be "Remote" or "Home".
 > >>
 > >> My question is--
 > >>
 > >> How to set transaction isolation level for a method inside a Local
 > >Interface or
 > >> Local_Home Interface?
 > >>
 > >> Thanks.
 > >>
 > >> Xing
 > >
 > >--
 > >
 > >----------------------------------------------------------------------
 > >
 > >AVAILABLE NOW!: Building J2EE Applications & BEA WebLogic Server
 > >
 > >by Michael Girdley, Rob Woollen, and Sandra Emerson
 > >
 > >http://learnWebLogic.com
 > >
 > >
 > >
 > >
 > ><!doctype html public "-//w3c//dtd html 4.0 transitional//en">
 > ><html>
 > >Use LocalHome or Local.
 > >-- Rob
 > >Xing wrote:
 > ><blockquote TYPE=CITE>By reference at:
 > > http://e-docs.bea.com/wls/docs61/ejb/reference.html#1071267,
 > > the value for method-intf can only be "Remote" or "Home".
 > >My question is--
 > >How to set transaction isolation level for a method inside a Local
 > >Interface
 > >or
 > > Local_Home Interface?
 > >Thanks.
 > >Xing</blockquote>
 > >
 > ><pre>--
 > >
 > >----------------------------------------------------------------------
 > >
 > >AVAILABLE NOW!: Building J2EE Applications & BEA WebLogic Server
 > >
 > >by Michael Girdley, Rob Woollen, and Sandra Emerson
 > >
 > >http://learnWebLogic.com</pre>
 > > </html>
 > >
 > >
 AVAILABLE NOW!: Building J2EE Applications & BEA WebLogic Server
 by Michael Girdley, Rob Woollen, and Sandra Emerson
 http://learnWebLogic.com
 [att1.html]

Setting isolation level with JDriver for Oracle/XA

edocs (http://e-docs.bea.com/wls/docs70/oracle/trxjdbcx.html#1080746) states that,
if using jDriver for Oracle/XA you can not set the transaction isolation level
for a transaction and that 'Transactions use the transaction isolation level set
on the connection or the default transaction isolation level for the database'.
Does this mean that you shouldn't try to set it programatically (fair enough)
or that you can't set it in the weblogic deployment descriptor either? Also anybody
got any idea what the default is likely to be if you are using an Oracle 9iR2
database? Is this determined by some database setting?

IJ wrote:
edocs (http://e-docs.bea.com/wls/docs70/oracle/trxjdbcx.html#1080746) states that,
if using jDriver for Oracle/XA you can not set the transaction isolation level
for a transaction and that 'Transactions use the transaction isolation level set
on the connection or the default transaction isolation level for the database'.
Does this mean that you shouldn't try to set it programatically (fair enough)
or that you can't set it in the weblogic deployment descriptor either? Also anybody
got any idea what the default is likely to be if you are using an Oracle 9iR2
database? Is this determined by some database setting?The system should honor the setting defined in the deployment descriptor,
however, for oracle it may not be helpful to change it. Oracle provides two
isolation levels. The default is always READ_COMMITTED. The other
setting is SERIALIZABLE, but this hurts performance, and is also problematic
in the way oracle implements it. For instance, even if you set SERIALIZABLE,
oracle will not lock read data. It will allow other transactions to read and/or
alter data trhat another ongoing SERIALIZABLE transaction has read. The
only way to really lock read data in oracle is to issue oracle-specific SQL in
your select: "SELECT ..... FOR UPDATE".
All in all, you should collect a strong case for why you can't proceed with
READ_COMMITTED first. Then you should research oracle's recommendations
(and their problem record) with SERIALIZABLE.
Joe Weinstein at BEA

Setting transaction isolation level for jDriver Oracle/XA

edocs (http://e-docs.bea.com/wls/docs70/oracle/trxjdbcx.html#1080746) states that,
if using jDriver for Oracle/XA you can not set the transaction isolation level
for a
transaction and that 'Transactions use the transaction isolation level set on
the connection
or the default transaction isolation level for the database'. Does this mean that
you shouldn't try to set it programatically (fair enough) or that you can't set
it in the weblogic deployment descriptor either? Also anybody got any idea what
the default is likely to be if you are using
an Oracle 9iR2 database?

Ian,
The default for Oracle (any version) is ReadCommitted. The only other
isolation level Oracle supports is Serializable but it's implemented in
such a way that you will be allowed to continue until commit time and
only then you might get an exception stating the the access for that
transaction could not be serialized.
I don't know for the jDriver but if you use the Oracle Thin XA driver
even if you set the isolation level in your descriptor you will get an
exception from Weblogic. It is a Weblogic bug and you can contact
[email protected] to get a patch.
Regards,
Dejan
IJ wrote:
edocs (http://e-docs.bea.com/wls/docs70/oracle/trxjdbcx.html#1080746) states that,
if using jDriver for Oracle/XA you can not set the transaction isolation level
for a
transaction and that 'Transactions use the transaction isolation level set on
the connection
or the default transaction isolation level for the database'. Does this mean that
you shouldn't try to set it programatically (fair enough) or that you can't set
it in the weblogic deployment descriptor either? Also anybody got any idea what
the default is likely to be if you are using
an Oracle 9iR2 database?

How to launch Web administration service and set trace level for web dispac

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Thanks in advance.

Hi Sam,
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BMT - Setting Isolation Level

 (I posted this in ejb but didn't really get a solution that works)
 I'm able to set the isolation level of a CMT using weblogic-ejb-jar.xml without
 any problems. Below is a snipet which shows how that:
 <transaction-isolation> <isolation-level>TRANSACTION_READ_COMMITTED</isolation-level>
 <method> <description><![CDATA[Transaction isolation for StateHandlerMessage]]></description>
 <ejb-name>StateHandlerMessage</ejb-name> <method-name>*</method-name> </method>
 </transaction-isolation>
 That works perfectly for a CMT bean, however it does not seem to work for a BMT.
 I'm using weblogic81 in development mode with an oracle jdriver and it seems my
 BMT bean is getting an isolation level of TRANSACTION_SERIALIZABLE.
 Is this a bug? If not how do I set the isolation level for a BMT bean? (I don't
 think I can using Connection.setIsolationLevel since I don't have a connection
 within my Session and Message Beans)
 thanks!
 lance


 But weblogic.transaction.Transaction does have setProperty method and you should
 be able to use :
 weblogic.transaction.TxHelper.getTransaction().setProperty() to set that property.
 "Lance" <[email protected]> wrote:
 >
 >Thanks for the reply, however javax.transaction.UserTransaction does
 >not have a
 >.setProperty method.
 >
 >Any ideas?
 >
 >lance
 >
 >"asafbu" <[email protected]> wrote:
 >>
 >>
 >>
 >>You set the isolation level for user transactions in the beans java
 >code.
 >>When
 >>the application runs, the transaction is explicitly started.
 >>
 >>
 >>User Transaction tx = (UserTransaction) ctx.lookup("javax.transaction.UserTransaction");
 >>
 >>tx.begin();
 >>
 >>tx.setProperty (TxConstants.ISOLATION_LEVEL, new Integer
 >> (Connection.TRANSACTION_READ_COMMITED));
 >>....
 >>....
 >>
 >>
 >>
 >>
 >>
 >>"Lance" <[email protected]> wrote:
 >>>
 >>>(I posted this in ejb but didn't really get a solution that works)
 >>>
 >>>I'm able to set the isolation level of a CMT using weblogic-ejb-jar.xml
 >>>without
 >>>any problems. Below is a snipet which shows how that:
 >>>
 >>><transaction-isolation> <isolation-level>TRANSACTION_READ_COMMITTED</isolation-level>
 >>><method> <description><![CDATA[Transaction isolation for StateHandlerMessage]]></description>
 >>><ejb-name>StateHandlerMessage</ejb-name> <method-name>*</method-name>
 >>></method>
 >>></transaction-isolation>
 >>>
 >>>That works perfectly for a CMT bean, however it does not seem to work
 >>>for a BMT.
 >>>I'm using weblogic81 in development mode with an oracle jdriver and
 >>it
 >>>seems my
 >>>BMT bean is getting an isolation level of TRANSACTION_SERIALIZABLE.
 >>
 >>>
 >>>Is this a bug? If not how do I set the isolation level for a BMT bean?
 >>> (I don't
 >>>think I can using Connection.setIsolationLevel since I don't have a
 >>connection
 >>>within my Session and Message Beans)
 >>>
 >>>thanks!
 >>>
 >>>lance
 >>>
 >>
 >

Transaction Isolation Level for EJB methods

L.S.
I just found out the in OC4J one can not set the transaction isolation level on ejb methods. Moreover one needs to revert to bean managed transaction (manual coding of the ALL transaction logic) to set the isolation level.
On entity beans one can only set the isolation level for the whole bean (not on individual methods), and in session beans there is no way at all to set the isolation level.
This is on shear contract to all other application servers I used before (there one can declaratively set the isolation level for a ejb method, both in session and in entitybean deployment descriptors)
Is it foreseen in a future release to include such a valuable feature will be provided by oc4j?
Note that I was VERY surprised that OC4J could not handle this (I checked the j2ee spec, but admittedly the spec is a little vague about this support and makes it vendor dependent. the j2ee spec does not mandate this, except for CMP entity beans, but includes some suggestions on this ability. But most other application servers implemented the ability)
Regadrs,
Erik

Hello Erik --
I think we met in Perth recently?
Anyway, your information is correct.
We can set the transaction isolation level for each entity bean, at the bean level. We don't have for the specification of method level isolation settings -- I'd be interested to hear how you would like/do use this. What behaviour do you expect to see when a transaction is started that spans multiple methods on a bean with different declared isolation levels.
For session beans, we do not currently have the ability to declaratively specify the isolation level to use for the bean. I know this is not in the forthcoming 904 release, and will to check what is beyond that.
As you point out, this can be done programatically using the Connection.setIsolationLevel() method on any connections you are using from within the session bean.
I'd would like to log an enhancement request for you for this functionality. Can you send me an email at [email protected] and we'll take it offline.
-steve-

How to set default values for boolean columns

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Setting Isolation Level In A UserTransaction

We are having a problem where a class creates a UserTransaction from the InitialContext,
but does not see any database changes made by other EJBs even though they have
been committed. This "seems" like an isolation issue.
What is the default isolation level for UserTransaction? And since it appears
that it is not seeing committed data, what level should it be set to? (i.e. TRANSACTION_READ_COMMITTED
would be nice...)

this is mirrored from the transaction newsgroup:
Joseph Weinstein <[email protected]> wrote:
>
>
Interesting, but it's not an isolation level issue. There is no DBMS
isolation level
that could cause a user not to see already-committed data.Well, we are using Oracle as our backend and it supports Read Uncommitted, Read
Committed and Serializable. The Serializable option would prevent a transaction
from seeing any committed data to a table (i.e. prevents unrepeatable reads).
The default isolation level of most DBMSes is READ_COMMITTED, and you
should
never have to change it, and you should be able to see already-committed
data.I agree, but that is not happening for us (and this gets somewhat complicated
with JMS). What is Weblogic 8.1's default isolation level for any transaction.
From the link below, I get the impression it is SERIALIZABLE which would explain
the behaviour I'm seeing. Athough the article seems to be talking about CMT (container
transation), I would suspect a BMT (bean managed transaction) be similar (just
manual).
If this only confuses things, please let me know the easiest way to communicate
this issue (code, etc..)
http://newsgroups.bea.com/cgi-bin/dnewsweb?cmd=article&group=weblogic.developer.interest.transaction&item=227&utag
(from the article)
Subject: Re: What is ths default transaction isolation level
Date: Mon, 12 Feb 2001 15:27:24 -0500
From: "Cameron Purdy" <[email protected]>
Organization: BEA SYSTEMS Inc
Newsgroup: weblogic.developer.interest.transaction
serializable
-- Cameron Purdy Tangosol, Inc. http://www.tangosol.com +1.617.623.5782 WebLogic
Consulting Available
"mrityunjay" <[email protected]> wrote in message news:3a86c781$[email protected]..
Hi , > If transaction isolation , for a EJB is not specified what is the > defaulttransaction isolation level > Thanks > Jay > >

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For 5.1, look at:
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 7
 http://www.weblogic.com/docs51/classdocs/API_ejb/EJB_reference.html#1061916
 "marshalli" <[email protected]> wrote in message
 news:3a59546d$[email protected]..
 >
 > How to set the isolation level(Container Manager or Bean Manager) in EJB.
 Thanks
 >
 >

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How to set isolation level for BMP

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