RAC 10.2.0.5 - Session waiting forever

Hi, i feel alone
The database has several sessions that are waiting forvever.
Sometimes these sessions are wainting for "direct path read", or "read by other session"
The objects on which the sessions are waiting are never the same (user table, or LOB, ...)
The OS process associated with the database session doesn't exists anymore on the system.
The connection is made with JDBC THIN CLIENT.
NO error messages as the session is just waiting indefinitly
If a start a new session and issue a simple SQL SELECT on the waited objects on both instance.
The first instance return the resultset. The second instance just wait forever.
After the blocked objects is rebuilt, SQL SELECT works fine from both instance.
Killing the waiting sessions doesn't solve the probleme as next same SQL QUERY from the other instance, will be blocked too ...
Rebuild the object solve the problem ...
BUT THIS IS FAR NOT A GOOD SOLUTION !
The database is Oracle 10.2.0.5 SE RAC for LInux RHEL5 x64.
ASM is used.
Thank you for any suggestions !

Hi,
thank you for your response.
This is a STANDARD EDITION with all tables degree set to 1, and all indexes degrees set to 1 or 0.
I kill the session selected with the following query (the ones with high last_call_et)
select inst_id, username, last_call_et, event, row_wait_obj# from gv$session where status='ACTIVE' and state='WAITING' and username is not null;
Sometime, just kill the session solve the problem
Now, i got 1 session waiting forever on "read by other session" on table SYSTEM.SQLPLUS_PRODUCT_PROFILE the SQL executed is
"analyze table infomed2.dm_ligne ....;" .
The same problem appears on 2 differents databases on the same RAC cluster (all in 10.2.0.5)
i guess a bug with dictionnary latch, or with gcs, or with sqlnet( session closed but not realeased), ... but cannot find any information

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  • BPEL Test waits forever to receive callback from human task service

    Hi,
    I've created a test (CreditCardInvalidTest.xml) to test a bpel process (testbpel.bpel) which contains a call to a human task service. The problem is when the test executes it waits forever to receive the response message from the human task service but clearly i've emulated it! Would appreciate help.
    I've attached both files and highlighted the relevant sections. Thanks.
    testbpel.bpel
    <process name="testbpel" targetNamespace="http://xmlns.oracle.com/testbpel"
    xmlns="http://schemas.xmlsoap.org/ws/2003/03/business-process/"
    xmlns:wfcommon="http://xmlns.oracle.com/bpel/workflow/common"
    xmlns:bpws="http://schemas.xmlsoap.org/ws/2003/03/business-process/"
    xmlns:xp20="http://www.oracle.com/XSL/Transform/java/oracle.tip.pc.services.functions.Xpath20"
    xmlns:ns4="http://www.oracle.com/XSL/Transform/java/oracle.tip.xref.xpath.XRefXPathFunctions"
    xmlns:ns7="http://xmlns.oracle.com/testbpel/creditFault"
    xmlns:ldap="http://schemas.oracle.com/xpath/extension/ldap"
    xmlns:xsd="http://www.w3.org/2001/XMLSchema"
    xmlns:wf="http://schemas.oracle.com/bpel/extension/workflow"
    xmlns:ns5="http://oracle.com/esb/namespaces/Fufillment"
    xmlns:client="http://xmlns.oracle.com/testbpel"
    xmlns:ns6="http://www.creditcardagency.com/CreditCardService"
    xmlns:ora="http://schemas.oracle.com/xpath/extension"
    xmlns:taskservice="http://xmlns.oracle.com/bpel/workflow/taskService"
    xmlns:ns9="http://xmlns.oracle.com/testbpel/orderRejected"
    xmlns:ns1="http://xmlns.oracle.com/bpel/workflow/xpath"
    xmlns:ns3="http://www.oracle.com/XSL/Transform/java/oracle.tip.esb.server.headers.ESBHeaderFunctions"
    xmlns:ns2="http://xmlns.oracle.com/bpel/services/IdentityService/xpath"
    xmlns:bpelx="http://schemas.oracle.com/bpel/extension"
    xmlns:task="http://xmlns.oracle.com/bpel/workflow/task"
    xmlns:orcl="http://www.oracle.com/XSL/Transform/java/oracle.tip.pc.services.functions.ExtFunc"
    xmlns:ns8="http://xmlns.oracle.com/testbpel/genericFault">
    <!--
    PARTNERLINKS
    List of services participating in this BPEL process
    -->
    <partnerLinks>
    <!--
    The 'client' role represents the requester of this service. It is
    used for callback. The location and correlation information associated
    with the client role are automatically set using WS-Addressing.
    -->
    <partnerLink name="client" partnerLinkType="client:testbpel"
    myRole="testbpelProvider" partnerRole="testbpelRequester"/>
    <partnerLink name="ShipmentService" partnerRole="execute_pptProvider"
    partnerLinkType="ns5:execute_pptLT"/>
    <partnerLink name="CreditCardService"
    partnerRole="CreditCardServiceProvider"
    partnerLinkType="ns6:CreditCardService"/>
    <partnerLink myRole="TaskServiceCallbackListener" name="TaskService"
    partnerRole="TaskService"
    partnerLinkType="taskservice:TaskService"/>
    </partnerLinks>
    <!--
    VARIABLES
    List of messages and XML documents used within this BPEL process
    -->
    <variables>
    <!-- Reference to the message passed as input during initiation -->
    <!-- Reference to the message that will be sent back to the requester during callback -->
    <variable name="inputVariable"
    messageType="client:testbpelRequestMessage"/>
    <variable name="outputVariable"
    messageType="client:testbpelResponseMessage"/>
    <variable name="n" type="xsd:integer"/>
    <variable name="Invoke_ShipmentService_execute_InputVariable"
    messageType="ns5:orderRequest_request"/>
    <variable name="paymentFault"
    messageType="client:testbpelFaultMessage"/>
    <variable name="ApproveOrder_1_globalVariable"
    messageType="taskservice:taskMessage"/>
    <variable name="orderRejectedFault"
    messageType="client:testbpelFaultMessage"/>
    </variables>
    <faultHandlers>
    <catchAll>
    <sequence name="Sequence_6">
    <throw name="Throw_AllFaults"
    faultName="ns8:testbpelGenericFault"
    faultVariable="paymentFault"/>
    </sequence>
    </catchAll>
    </faultHandlers>
    <!--
    ORCHESTRATION LOGIC
    Set of activities coordinating the flow of messages across the
    services integrated within this business process
    -->
    <sequence name="main">
    <!-- Receive input from requestor. (Note: This maps to operation defined in testbpel.wsdl) -->
    <receive name="receiveInput" partnerLink="client"
    portType="client:testbpel" operation="initiate"
    variable="inputVariable" createInstance="yes"/>
    <!--
    Asynchronous callback to the requester. (Note: the callback location and correlation id is transparently handled using WS-addressing.)
    -->
    <scope name="CheckForApproval">
    <sequence name="Sequence_4">
    <sequence name="Sequence_5">
    <scope name="ApproveOrder_1"
    xmlns:wf="http://schemas.oracle.com/bpel/extension/workflow"
    wf:key="ApproveOrder_1_globalVariable">
    <bpelx:annotation>
    <bpelx:pattern patternName="bpelx:workflow"></bpelx:pattern>
    </bpelx:annotation>
    <variables>
    <variable name="initiateTaskInput"
    messageType="taskservice:initiateTaskMessage"/>
    <variable name="initiateTaskResponseMessage"
    messageType="taskservice:initiateTaskResponseMessage"/>
    </variables>
    <correlationSets>
    <correlationSet name="WorkflowTaskIdCor"
    properties="taskservice:taskId"/>
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    <sequence>
    <assign name="ApproveOrder_1_AssignTaskAttributes">
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    <from expression="concat(ora:getProcessURL(), string('/ApproveOrder/ApproveOrder.task'))"/>
    <to variable="initiateTaskInput"
    part="payload"
    query="/taskservice:initiateTask/task:task/task:taskDefinitionURI"/>
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    <copy>
    <from expression="number(3)"/>
    <to variable="initiateTaskInput"
    part="payload"
    query="/taskservice:initiateTask/task:task/task:priority"/>
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    <copy>
    <from>
    <payload xmlns="http://xmlns.oracle.com/bpel/workflow/task"/>
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    <to variable="initiateTaskInput"
    part="payload"
    query="/taskservice:initiateTask/task:task/task:payload"/>
    </copy>
    </assign>
    <assign name="ApproveOrder_1_AssignSystemTaskAttributes">
    <copy>
    <from expression="ora:getInstanceId()"/>
    <to variable="initiateTaskInput"
    part="payload"
    query="/taskservice:initiateTask/task:task/task:processInfo/task:instanceId"/>
    </copy>
    <copy>
    <from expression="ora:getProcessId()"/>
    <to variable="initiateTaskInput"
    part="payload"
    query="/taskservice:initiateTask/task:task/task:processInfo/task:processName"/>
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    <copy>
    <from expression="ora:getProcessId()"/>
    <to variable="initiateTaskInput"
    part="payload"
    query="/taskservice:initiateTask/task:task/task:processInfo/task:processId"/>
    </copy>
    <copy>
    <from expression="ora:getProcessVersion()"/>
    <to variable="initiateTaskInput"
    part="payload"
    query="/taskservice:initiateTask/task:task/task:processInfo/task:processVersion"/>
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    <copy>
    <from expression="ora:getDomainId()"/>
    <to variable="initiateTaskInput"
    part="payload"
    query="/taskservice:initiateTask/task:task/task:processInfo/task:domainId"/>
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    <copy>
    <from expression="string('BPEL')"/>
    <to variable="initiateTaskInput"
    part="payload"
    query="/taskservice:initiateTask/task:task/task:processInfo/task:processType"/>
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    <invoke name="initiateTask_ApproveOrder_1"
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    portType="taskservice:TaskService"
    operation="initiateTask"
    inputVariable="initiateTaskInput"
    outputVariable="initiateTaskResponseMessage">
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    <correlation initiate="yes"
    set="WorkflowTaskIdCor"
    pattern="in"/>
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    *<receive name="receiveCompletedTask_ApproveOrder_1"*
    partnerLink="TaskService"
    portType="taskservice:TaskServiceCallback"
    operation="onTaskCompleted"
    variable="ApproveOrder_1_globalVariable"
    createInstance="no">
    *<correlations>*
    *<correlation initiate="no"*
    set="WorkflowTaskIdCor"/>
    *</correlations>*
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    <bpelx:pattern patternName="case">Task outcome is REJECT</bpelx:pattern>
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    <sequence>
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    <copy>
    <from expression="string('Order rejected by manager')"/>
    <to variable="paymentFault"
    part="payload"
    query="/client:testbpelProcessFault/client:status"/>
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    <throw name="ThrowOrderRejected"
    faultName="ns9:orderRejectedFault"
    faultVariable="orderRejectedFault"/>
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    <bpelx:pattern patternName="case">Task outcome is APPROVE</bpelx:pattern>
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    <sequence>
    <empty name="Empty_1"/>
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    <otherwise>
    <bpelx:annotation>
    <bpelx:pattern>Task is outcome is EXPIRED, STALE, WITHDRAWN or ERRORED</bpelx:pattern>
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    <sequence>
    <empty name="Empty_2"/>
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    </otherwise>
    </switch>
    </sequence>
    </sequence>
    </scope>
    <scope name="CheckCreditCard">
    <variables>
    <variable name="InvokeCreditCardService_process_InputVariable"
    messageType="ns6:CreditCardServiceRequestMessage"/>
    <variable name="InvokeCreditCardService_process_OutputVariable"
    messageType="ns6:CreditCardServiceResponseMessage"/>
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    <sequence name="Sequence_2">
    <assign name="Assign_1">
    <copy>
    <from variable="inputVariable" part="payload"
    query="/client:testbpelProcessRequest/client:CreditCardNumber"/>
    <to variable="InvokeCreditCardService_process_InputVariable"
    part="payload"
    query="/ns6:CreditCardServiceProcessRequest/ns6:CreditCardNumber"/>
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    </assign>
    <scope name="Scope_1">
    <compensationHandler>
    <sequence name="Sequence_7">
    <empty name="Empty_3"/>
    </sequence>
    </compensationHandler>
    <invoke name="InvokeCreditCardService"
    partnerLink="CreditCardService"
    portType="ns6:CreditCardService" operation="process"
    inputVariable="InvokeCreditCardService_process_InputVariable"
    outputVariable="InvokeCreditCardService_process_OutputVariable"/>
    </scope>
    <switch name="CheckCreditCardValid">
    <case condition="bpws:getVariableData('InvokeCreditCardService_process_OutputVariable','payload','/ns6:CreditCardServiceProcessResponse/ns6:result') = 'false'">
    <sequence name="Sequence_3">
    <assign name="AssignCreditFault">
    <copy>
    <from expression="string('Invalid credit card number')"/>
    <to variable="paymentFault" part="payload"
    query="/client:testbpelProcessFault/client:status"/>
    </copy>
    </assign>
    <throw name="ThrowCreditFault"
    faultName="ns7:CreditCardNumberFault"
    faultVariable="paymentFault"/>
    </sequence>
    </case>
    </switch>
    </sequence>
    </scope>
    <assign name="AssignInitial">
    <copy>
    <from expression="string('Select Manufacturer')"/>
    <to variable="outputVariable" part="payload"
    query="/client:testbpelProcessResponse/client:result"/>
    </copy>
    <copy>
    <from expression="1"/>
    <to variable="n"/>
    </copy>
    <copy>
    <from expression="0.0"/>
    <to variable="outputVariable" part="payload"
    query="/client:testbpelProcessResponse/client:price"/>
    </copy>
    </assign>
    <while name="While_1"
    condition="bpws:getVariableData('n') &lt;= count(bpws:getVariableData('inputVariable','payload','/client:testbpelProcessRequest/client:input'))">
    <sequence name="Sequence_1">
    <assign name="DoCalculation">
    <copy>
    <from expression="bpws:getVariableData('inputVariable','payload', concat('/client:testbpelProcessRequest/client:input[', bpws:getVariableData('n'), ']/client:quantity')) * bpws:getVariableData('inputVariable','payload',concat('/client:testbpelProcessRequest/client:input[', bpws:getVariableData('n'), ']/client:bookPrice')) + bpws:getVariableData('outputVariable','payload','/client:testbpelProcessResponse/client:price')"/>
    <to variable="outputVariable" part="payload"
    query="/client:testbpelProcessResponse/client:price"/>
    </copy>
    <copy>
    <from expression="bpws:getVariableData('n') + 1"/>
    <to variable="n"/>
    </copy>
    </assign>
    </sequence>
    </while>
    <assign name="Transform_2">
    <bpelx:annotation>
    <bpelx:pattern>transformation</bpelx:pattern>
    </bpelx:annotation>
    <copy>
    <from expression="ora:processXSLT('TransformOrder.xsl',bpws:getVariableData('inputVariable','payload'))"/>
    <to variable="Invoke_ShipmentService_execute_InputVariable"
    part="orderRequest"/>
    </copy>
    </assign>
    <invoke name="Invoke_ShipmentService" partnerLink="ShipmentService"
    portType="ns5:execute_ppt" operation="execute"
    inputVariable="Invoke_ShipmentService_execute_InputVariable"/>
    <invoke name="callbackClient" partnerLink="client"
    portType="client:testbpelCallback" operation="onResult"
    inputVariable="outputVariable"/>
    </sequence>
    </process>
    CreditCardInvalidTest.xml
    <BPELTest processName="testbpel"
    xmlns="http://xmlns.oracle.com/bpel/instancedriver"
    xmlns:client="http://xmlns.oracle.com/testbpel">
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    <part fileName="testInput.xml" name="payload"/>
    </inboundMessage>
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    <activityDriver name="callbackClient">
    <assertValue variableName="outputVariable" partName="payload"
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    <message>Expected "Select Manufacturer"</message>
    <actualPath>/client:testbpelProcessResponse/client:result</actualPath>
    <expected>Select Manufacturer</expected>
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    <assertValue variableName="outputVariable" partName="payload"
    comparisonMethod="string" fatal="true" patternMatch="false">
    <message>Expected price of "1"</message>
    <actualPath>/client:testbpelProcessResponse/client:price</actualPath>
    <expected>1</expected>
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    *<activityDriver name="receiveCompletedTask_ApproveOrder_1">*
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    <activityDriver name="initiateTask_ApproveOrder_1">
    <emulate duration="PT">
    <inboundMessage>
    <part fileName="getApproval.xml" name="payload"/>
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    RaviKiran,
    I agree that the explanation oracle provided in the attach link, is a bit confusing. The main goal there is to describe the behavior of processes, when there is a need to combine, or split the transactions within those processes (or in some cases the processes themselves).
    The thing is - The default transaction for a synchronous process is requiresNew. That was until version 11.1.1.6. On this last version, you are asking to enter a Transaction parameter when creating a new synchronous bpel process. The default value being prompt is required and that's what causing the problem – You automatically accept the default.
    The assumption is, that developing bpel processes, should come with understanding of all those behaviors.
    The problem for my understanding is that some of those behaviors were not so cleared until now.
    Arik

  • Test waits forever for a callback from a human task

    Hi,
    I've create a test to test a BPEL process. Now within the BPEL process there is a call to a human task service. I've emulated the task initiation message which is fine. I also tried to emulate the receive message from the human task service but during the test execution, the test waits forever to receive the callback from the human task service, even though i've specified the return message. Would appreciate help with this! I've posted my testbpel.bpel and the test case (CreditCardInvalidTest.xml) below. For both these files I've highlighted in bold the relevant bits of code that's giving me problems. Thanks
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    <?xml version = "1.0" encoding = "UTF-8" ?>
    <process name="testbpel" targetNamespace="http://xmlns.oracle.com/testbpel"
    xmlns="http://schemas.xmlsoap.org/ws/2003/03/business-process/"
    xmlns:wfcommon="http://xmlns.oracle.com/bpel/workflow/common"
    xmlns:bpws="http://schemas.xmlsoap.org/ws/2003/03/business-process/"
    xmlns:xp20="http://www.oracle.com/XSL/Transform/java/oracle.tip.pc.services.functions.Xpath20"
    xmlns:ns4="http://www.oracle.com/XSL/Transform/java/oracle.tip.xref.xpath.XRefXPathFunctions"
    xmlns:ns7="http://xmlns.oracle.com/testbpel/creditFault"
    xmlns:ldap="http://schemas.oracle.com/xpath/extension/ldap"
    xmlns:xsd="http://www.w3.org/2001/XMLSchema"
    xmlns:wf="http://schemas.oracle.com/bpel/extension/workflow"
    xmlns:ns5="http://oracle.com/esb/namespaces/Fufillment"
    xmlns:client="http://xmlns.oracle.com/testbpel"
    xmlns:ns6="http://www.creditcardagency.com/CreditCardService"
    xmlns:ora="http://schemas.oracle.com/xpath/extension"
    xmlns:taskservice="http://xmlns.oracle.com/bpel/workflow/taskService"
    xmlns:ns9="http://xmlns.oracle.com/testbpel/orderRejected"
    xmlns:ns1="http://xmlns.oracle.com/bpel/workflow/xpath"
    xmlns:ns3="http://www.oracle.com/XSL/Transform/java/oracle.tip.esb.server.headers.ESBHeaderFunctions"
    xmlns:ns2="http://xmlns.oracle.com/bpel/services/IdentityService/xpath"
    xmlns:bpelx="http://schemas.oracle.com/bpel/extension"
    xmlns:task="http://xmlns.oracle.com/bpel/workflow/task"
    xmlns:orcl="http://www.oracle.com/XSL/Transform/java/oracle.tip.pc.services.functions.ExtFunc"
    xmlns:ns8="http://xmlns.oracle.com/testbpel/genericFault">
    <!--
    PARTNERLINKS
    List of services participating in this BPEL process
    -->
    <partnerLinks>
    <!--
    The 'client' role represents the requester of this service. It is
    used for callback. The location and correlation information associated
    with the client role are automatically set using WS-Addressing.
    -->
    <partnerLink name="client" partnerLinkType="client:testbpel"
    myRole="testbpelProvider" partnerRole="testbpelRequester"/>
    <partnerLink name="ShipmentService" partnerRole="execute_pptProvider"
    partnerLinkType="ns5:execute_pptLT"/>
    <partnerLink name="CreditCardService"
    partnerRole="CreditCardServiceProvider"
    partnerLinkType="ns6:CreditCardService"/>
    <partnerLink myRole="TaskServiceCallbackListener" name="TaskService"
    partnerRole="TaskService"
    partnerLinkType="taskservice:TaskService"/>
    </partnerLinks>
    <!--
    VARIABLES
    List of messages and XML documents used within this BPEL process
    -->
    <variables>
    <!-- Reference to the message passed as input during initiation -->
    <!-- Reference to the message that will be sent back to the requester during callback -->
    <variable name="inputVariable"
    messageType="client:testbpelRequestMessage"/>
    <variable name="outputVariable"
    messageType="client:testbpelResponseMessage"/>
    <variable name="n" type="xsd:integer"/>
    <variable name="Invoke_ShipmentService_execute_InputVariable"
    messageType="ns5:orderRequest_request"/>
    <variable name="paymentFault"
    messageType="client:testbpelFaultMessage"/>
    <variable name="ApproveOrder_1_globalVariable"
    messageType="taskservice:taskMessage"/>
    <variable name="orderRejectedFault"
    messageType="client:testbpelFaultMessage"/>
    </variables>
    <faultHandlers>
    <catchAll>
    <sequence name="Sequence_6">
    <throw name="Throw_AllFaults"
    faultName="ns8:testbpelGenericFault"
    faultVariable="paymentFault"/>
    </sequence>
    </catchAll>
    </faultHandlers>
    <!--
    ORCHESTRATION LOGIC
    Set of activities coordinating the flow of messages across the
    services integrated within this business process
    -->
    <sequence name="main">
    <!-- Receive input from requestor. (Note: This maps to operation defined in testbpel.wsdl) -->
    <receive name="receiveInput" partnerLink="client"
    portType="client:testbpel" operation="initiate"
    variable="inputVariable" createInstance="yes"/>
    <!--
    Asynchronous callback to the requester. (Note: the callback location and correlation id is transparently handled using WS-addressing.)
    -->
    <scope name="CheckForApproval">
    <sequence name="Sequence_4">
    <sequence name="Sequence_5">
    <scope name="ApproveOrder_1"
    xmlns:wf="http://schemas.oracle.com/bpel/extension/workflow"
    wf:key="ApproveOrder_1_globalVariable">
    <bpelx:annotation>
    <bpelx:pattern patternName="bpelx:workflow"></bpelx:pattern>
    </bpelx:annotation>
    <variables>
    <variable name="initiateTaskInput"
    messageType="taskservice:initiateTaskMessage"/>
    <variable name="initiateTaskResponseMessage"
    messageType="taskservice:initiateTaskResponseMessage"/>
    </variables>
    <correlationSets>
    <correlationSet name="WorkflowTaskIdCor"
    properties="taskservice:taskId"/>
    </correlationSets>
    <sequence>
    <assign name="ApproveOrder_1_AssignTaskAttributes">
    <copy>
    <from expression="concat(ora:getProcessURL(), string('/ApproveOrder/ApproveOrder.task'))"/>
    <to variable="initiateTaskInput"
    part="payload"
    query="/taskservice:initiateTask/task:task/task:taskDefinitionURI"/>
    </copy>
    <copy>
    <from expression="number(3)"/>
    <to variable="initiateTaskInput"
    part="payload"
    query="/taskservice:initiateTask/task:task/task:priority"/>
    </copy>
    <copy>
    <from>
    <payload xmlns="http://xmlns.oracle.com/bpel/workflow/task"/>
    </from>
    <to variable="initiateTaskInput"
    part="payload"
    query="/taskservice:initiateTask/task:task/task:payload"/>
    </copy>
    </assign>
    <assign name="ApproveOrder_1_AssignSystemTaskAttributes">
    <copy>
    <from expression="ora:getInstanceId()"/>
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    Jonathan Lewis
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    To post code, statspack/AWR report, execution plans or trace files, start and end the section with the tag {noformat}{noformat} (lowercase, curly brackets, no spaces) so that the text appears in fixed format.
    "Science is more than a body of knowledge; it is a way of thinking"
    Carl Sagan                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       

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    WHERE REGISTER = pRegsCode AND doc_code = pDocCode AND
    loc_code = pLocCode AND
              doc_year = vDocYear
    RETURNING TO_CHAR(doc_nbr, '0000000') INTO vDocNo ;
    Sometimes, this statement wait very long, I see in EM Top SQL that the Wait value = 99.66%. I assume this is caused by another user run same program and Not Commit.
    So the question is :
    1) How to make the 'UPDATE...' statement only wait 10 seconds, if fail to get the lock then time out ?
    2) If a user run the stored proc and do not Commit, how to make the transaction 'Expires' after 10 seconds so that it does not block other users ??
    FYI, the COMMIT part is not in the stored proc, it is done in ADF level.
    That is why if there is error in ADF after executing the stored proc, the transaction left Uncommitted
    Thank you very much for your help,
    xtanto

    This is not an Oracle issue and cannot really be sensible addressed (if at all) at Oracle level.
    How is Oracle suppose to know that after 10 seconds (or minutes) to "expire" (rollback) all uncommitted transactions? This deals with the client side of the client-server. How to interact with the client. When to determine that the user on the client is idle. Etc.
    There is no triggering/event mechanism I know of inside an Oracle server session that can be fired after the Oracle session has been idle for a period of time. The closest to that is DCD (Dead Connection Detection) - which is n.a. as the client is not dead, just idle.
    The application controls and manages the the user interaction. It is in a far better position to realise that the user is not responding, and then to rollback its Oracle session.
    This should be therefore done by the client and not Oracle. In its simplest form, you have a session handle in the client for your Oracle session. You create a global boolean variable (called something like openTransaction) in the application. This is set to TRUE when a transaction (e.g. select for update, insert, updare or delete) is started.
    An application timer runs every n number of seconds. When it runs, it checks openTransaction. If true, it issues a ROLLBACK statement on that session handle.
    This should do the trick.. in large hammer fashion way. Any such implementation will need careful thought and consideration of the actual business requirements and business process flow.
    It is very seldom that in business, clerks John and Jane will be working with the very same client file/invoice/whatever at the exact same time. And when there is conflict, you want to make sure that either Jane or John works on that at a time.
    So before even looking for a technical solution to your problem, I would first determine what the business process flow are and the boundaries of the business transaction, in order to realise a solution.

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