Lost updates in cluster environment known problem?

          we are running weblogic clustered. We have an entity bean that is set to read-write
          (which means that in clustering no caching will be used as per your docs). We
          are hitting this entity bean from both servers at the same time, an update by
          one, and a read by the other. What is happening is that the update appears to
          get lost for lack of a better term. We have the update in a method that requires
          a transaction, and after this method is finished (which means the trasaction/db
          commit has completed) we have a finder method that returns the updated record.
          Then, we shut down the servers and look in the db, the row has NOT been updated.
          We found something in your docs about "lost updates". It said to set the isModified
          method in the ejb to always return true, this also did not help.
          Okay, we found issues just like this in posts to the bea newsgroups from 2000.
          We tried what was recommended by Rob Woolen, and it worked. We set the <delay-updates-until-end-of-tx>false</delay-updates-until-end-of-tx>.
          This has stopped this from happening. Any thought? Is this really a true fix?
          Thanks all...

          We have db-is-shaed to true.
          Also, its not that one server is overwriting what the second server does, its
          that one server is doing multiple reads as the other server doing the update.
          Then the update never gets to the db, even after the servers are both brought
          down, its still not there, even though we do a find after the update tranaction
          completes, and it returns an updated row! Ugh...
          "Cameron Purdy" <[email protected]> wrote:
          >Transactional control does not stop lost updates. If the second server
          >overwrites the cahnges made by the first, then the update will be lost.
          >
          >The question is this: What behavior do you actually want? Do you want
          >the
          >update on one server to disallow the update on the other server? If so,
          >explain your reasoning.
          >
          >What you should have is a means to ensure data integrity, which is to
          >say
          >that your transactions should not be able to complete if another
          >transactionchanges necessary data during the course of the transaction.
          >That
          >is usually accomplished by employing version or timestamp columns.
          >
          >Peace,
          >
          >--
          >Cameron Purdy
          >Tangosol Inc.
          >Tangosol Coherence: Clustered Coherent Cache for J2EE
          >Information at http://www.tangosol.com/
          >
          >
          >"ralph" <[email protected]> wrote in message
          >news:[email protected]...
          >>
          >> we are running weblogic clustered. We have an entity bean that is set
          >to
          >read-write
          >> (which means that in clustering no caching will be used as per your
          >docs).
          >We
          >> are hitting this entity bean from both servers at the same time, an
          >update
          >by
          >> one, and a read by the other. What is happening is that the update
          >appears
          >to
          >> get lost for lack of a better term. We have the update in a method
          >that
          >requires
          >> a transaction, and after this method is finished (which means the
          >trasaction/db
          >> commit has completed) we have a finder method that returns the updated
          >record.
          >> Then, we shut down the servers and look in the db, the row has NOT
          >been
          >updated.
          >> We found something in your docs about "lost updates". It said to set
          >the
          >isModified
          >> method in the ejb to always return true, this also did not help.
          >>
          >> Okay, we found issues just like this in posts to the bea newsgroups
          >from
          >2000.
          >> We tried what was recommended by Rob Woolen, and it worked. We set
          >the
          ><delay-updates-until-end-of-tx>false</delay-updates-until-end-of-tx>.
          >> This has stopped this from happening. Any thought? Is this really a
          >true
          >fix?
          >>
          >> Thanks all...
          >>
          >
          >

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cjyang <[email protected]> writes:
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