Job not getting invoked on a logical standby instance

Hello,
We have created a job(through dbms_scheduler API). The job is enabled and shows up in the SCHEDULERJOBS view also.
However the job does not get executed. I looked into the following tables there was no relevant entry found for the aforesaid job:
select * from all_scheduler_job_log
select * from dba_scheduler_running_jobs
select * from DBA_SCHEDULER_JOB_RUN_DETAILS order by log_date desc
Is there any limitation that we cannot execute scheduled jobs on a logical standby database. If i execute the relevant program (that is configured to be run as job in this scenario) as an individual procedure from SQL plus, it gets executed successfully implying there is no errors/problem in the subprogram that the job is going to invoke.
Appreciate your thoughts in this regard.
Thanks.

I think then we need to think about an alternate way to tackle the problem.
Anyways thanks for your timely help Ravi.
Just one query, can we invoke remote stored procedures(i.e. using datalinks) from dbms_scheduler jobs on another db.
i.e. something like this:
DB0(primary db instance); DB1(is a logical standby db); DB2(centralized repository db)
DB1 contains certain packaged application procedures that need to be invoked as a scheduled activity.
Previously we had the scheduled jobs residing on the logical standby db itself but because of this known issue we cannot proceed with that design.
So can we have jobs,programs(mapping to DB1s stored procedure) scheduled on DB2?
Thanks.

Similar Messages

Scheduled job not getting executed on a logical standby

Hello,
We have created a job(through dbms_scheduler API). The job is enabled and shows up in the SCHEDULERJOBS view also.
However the job does not get executed. I looked into the following tables there was no relevant entry found for the aforesaid job:
select * from all_scheduler_job_log
select * from dba_scheduler_running_jobs
select * from DBA_SCHEDULER_JOB_RUN_DETAILS order by log_date desc
Is there any limitation that we cannot execute scheduled jobs on a logical standby database. If i execute the relevant program (that is configured to be run as job in this scenario) as an individual procedure from SQL plus, it gets executed successfully implying there is no errors/problem in the subprogram that the job is going to invoke.
Appreciate your thoughts in this regard.
Thanks.

Hi Justin,
Thanks for your response.
As per the app design, the job invokes a stored program(that maps to a stored procedure present in standby db itself) that reads the data from standby and populates the relevant tables/entities in another database(third db, not primary or standby) which acts as a repository. No write operations are to be performed on standby.
So, i have two doubts:
-- Can scheduled jobs execute on logical standby db[Oracle release 10g(R2)]
I was going through few of the oracle docs and it is mentioned that this is a known limitation in 10g
R2 release and has been corrected in 11g. Now we have something called database_role
attribute that needs to be set to 'LOGICAL STANDBY' if you need to execute a job on
standby. However it is available in 11g onwards.
-- If there is no workaround for the above mentioned problem in 10g-R2 release.
Then we may have to schedule a job from third db instance that shall invoke the program(residing on the standby db). Can we have a scheduled job which executes a program that maps to a remote stored procedure instead of local stored procedure?
Appreciate your thoughts.
Thanks

MV Logs not getting purged in a Logical Standby Database

We are trying to replicate a few tables in a logical standby database to another database. Both the source ( The Logical Standby) and the target database are in Oracle 11g R1.
The materialized views are refreshed using FAST REFRESH.
The Materialized View Logs created on the source ( the Logical Standby Database) are not getting purged when the MV in the target database is refreshed.
We checked the entries in the following Tables: SYS.SNAP$, SYS.SLOG$, SYS.MLOG$
When a materialized view is created on the target database, a record is not inserted into the SYS.SLOG$ table and it seems like that's why the MV Logs are not getting purged.
Why are we using a Logical Standby Database instead of the Primary ? Because, the load on the Primary Database is too much and the machine doesn't have enough resources to support MV based replication. The CPU usage is 95% all the time. The appplication owner won't allow us to go against the Primary database.
Do we have to do anything different in terms of Configuration/Privileges etc. because we are using a Logical Standby Database as a source ?
Thanks in Advance.

We have a 11g RAC database in solaris OS where there is huge gap in archive log apply.
Thread Last Sequence Received Last Sequence Applied Difference
1 132581 129916 2665
2 108253 106229 2024
3 107452 104975 2477
The MRP0 process seems not to be working also.Almost 7000+ archives lag in standby if compared with primary database.
i suggest you to go with Incremental rollforward backups to make it SYNC, use this below link for step by step procedure.
http://www.oracle-ckpt.com/rman-incremental-backups-to-roll-forward-a-physical-standby-database-2/
Here questions.
1) Whether those archives are transported & just not applied?
2) Is in production do you have archives or backup of archives?
3) What you have found errors in alert log file?
post
SQL> select severity,message,error_code,timestamp from v$dataguard_status where dest_id=2;
4) What errors in primary database alert log file?
Also post
select     ds.dest_id id
,     ad.status
,     ds.database_mode db_mode
,     ad.archiver type
,     ds.recovery_mode
,     ds.protection_mode
,     ds.standby_logfile_count "SRLs"
,     ds.standby_logfile_active active
,     ds.archived_seq#
from     v$archive_dest_status     ds
,     v$archive_dest          ad
where     ds.dest_id = ad.dest_id
and     ad.status != 'INACTIVE'
order by
     ds.dest_id
/Also check errors from standby database.

RBA GATP check is not getting invoked for Sales Order

Hi Everyone,
RBA GATP check is not getting invoked for Sales order.
I maintained the configuration settings for 'Rules-Based Availability Check', APO general settings (check mode, check instruction), carried out integrated rule maintenance, Rule determination for the combination of order type & product, associated the check mode to product master. Also maintained all the settings in ECC towards Req class, Req type, checking control etc.
However, sales order is not invoking RBA Check though it is showing up the 'Rule' icon in the screen. Also, in the APO Availability check in Sales order when I click onto 'check instruction', I get the checking mode that pertains to RBA for business event 'A' (Sales order). Though I have not maintained any stock for the main material for which I have the sales order, yet system is confirming any quantity that I put in.
I would expect that system would propose the same material in an alternate location where we have stock through RBA.
Request you to share ideas on this.
Regards,
Avijit Dutta

Hi Avijit,
You should used No Checking Horizon in Checking instructions and also Check your rule control settings.
What you have defined in 1st and 2nd steps. Check whether product substitution is carried out or Location Substitution.
Thanks,
Bala.

Shell Script not getting invoked in File adapter

Hi all,
Requirement:
PI need to pick the file from source directory and send it to target directory using SFTP.
I'm using SCP command for this purpose.
When I run the shell script (with simple SCP command) from command prompt, script is working fine.
Same script is called from PI File adapter but script is not getting invoked.
In the communication channel logs, "Executed OS command" is available. There are no Error/Warning messages in the log.
NFS transport protocol is used in the File communication channel.
Complete directory path of the shell script is mentioned in File channel -> Run Operating System command after message processing.
Even the following simple command is not working from PI receiver file channel:
echo "Test file" >> /data/test.txt
Please let me know if I'm missing out something.
Thanks,
Geetha

Hi Geetha,
I think the syntax u are using is not correct. Please follow the below syntax:
/path/<script_name> %F
for ex: /staging/Interface/XI/Script/FTPData %F
use the above in the communication channel.
%F should be after a space.
FTPData is the script name
/staging/Interface/XI/Script/ is the location where the script is present
Cheers,
Souvik
Edited by: Souvik Chatterjee on Apr 14, 2011 3:38 PM

Hostname verifier does not get invoked

Hi All,
I am new to weblogic and currently facing an issue with SSL. I checked this forum but none of the solutions really worked for me, so seeking advice starting a new thread. Kindly help.
Problem 1
I have a REST webservice running in one weblogic server and another weblogic server contains a client which is based on the code from the following link -
http://wiki.open-esb.java.net/attach/RestBCEchoSSL/SslClient.java
One way handshaking is enabled in both the weblogic and the KeyStore and Truststore are read from configurable directory in the client java code. I specify a directory which resides outside weblogic home.
Even though there is an HostnameVerifier implemented in the code to return true always, it does not get invoked and I get a certificate exception as below -
<Warning> <Security> <BEA-090542> <Certificate chain received from xx.yy.zz.rrr - xx.yy.zz.rrr was not trusted causing SSL handshake failure. Check the certificate chain to determine if it should be trusted or not. If it should be trusted, then update the client trusted CA configuration to trust the CA certificate that signed the peer certificate chain. If you are connecting to a WLS server that is using demo certificates (the default WLS server behavior), and you want this client to trust demo certificates, then specify -Dweblogic.security.TrustKeyStore=DemoTrust on the command line for this client.>
But when I run the java client from Eclipse I am able to invoke the webservice methods using HTTPs.
So is not it possible to add a default hostname verifier as in the java code when the application is deployed in weblogic?
Problem 2
I another attempt to solve the above issue I turned off the hostname verification from weblogic admin console in the client weblogic side. In the console for the server Configuration > SSL->Hostname Verification field is set to "None". But that did not help.
Then I added the '-Dweblogic.security.SSL.ignoreHostnameVerification=true' flag into the <domain>/bin/startWebLogic.sh file and restarted the weblogic. No luck again.
${JAVA_HOME}/bin/java ${JAVA_VM} ${MEM_ARGS} ${JAVA_OPTIONS} -Dweblogic.Name=${SERVER_NAME} -Djava.security.policy=${WL_HOME}/server/lib/weblogic.policy -Dweblogic.security.SSL.ignoreHostnameVerification=true ${PROXY_SETTINGS} ${SERVER_CLASS}
I tried recreating the certificate using the' hostname' instead of the ip address ( also added an entry into the /etc/hosts file putting the ip and hostname so that I can do ping <hostname> from the client and get response returned from the server side). Again no luck :(. I keep getting the same handshake failure as mentioned above.
The weblogic version is 10.x.
Thanks,
Amrit

I did some more research for the issue mentioned which I yet to get rid of.
1) I wrote a REST web service which makes a call to another REST service deployed on another weblogic using HTTPs (same code as mentioned above is used). I delpoyed the war and made a http call to the first webservice, the other REST service was invoked successfully using HTTPs. So this confirmed that there is no problem with the certificates or keystore or hostname verifictaion.
2) My actual application still throws the handshake exception as below -
<Warning> <Security> <BEA-090542> <Certificate chain received from xx.yy.zz.rrr - xx.yy.zz.rrr was not trusted causing SSL handshake failure. Check the certificate chain to determine if it should be trusted or not. If it should be trusted, then update the client trusted CA configuration to trust the CA certificate that signed the peer certificate chain. If you are connecting to a WLS server that is using demo certificates (the default WLS server behavior), and you want this client to trust demo certificates, then specify -Dweblogic.security.TrustKeyStore=DemoTrust on the command line for this client.>
So I think the problem is something else but weblogic is priniting the exception message wrong.
The process hierarchy ( in UNIX ) is as shown below -
bea 31914 31913 0 14:29 ? 00:00:00 /bin/sh <DOMAIN HOME>//bin/startWebLogic.sh
bea 31989 31914 0 14:29 ? 00:01:25 /opt/bea/jdk160_24/bin/java <The weblogic start server process> started by startWebLogic.sh
bea 32107 31989 0 14:29 ? 00:00:09 /opt/bea/jdk160_24/bin/java <One of custom process>
bea 2038 32107 0 18:38 ? 00:00:15 /opt/bea/jdk160_24/bin/java <Another custom process which contains my java classes containing the REST client>
The problem is there in both Weblogic 11 and 10.3 version.
I will be grateful if someone gives any clue about the problem.

J2EE adapter module not getting invoked by module processor

Hi All,
i have deployed my .ear file in SDM Repository successfully.
but my J2EE adapter module is not getting invoked by module processor......this i can say because i have written code to audit log my message in the java class...but when i gave input an empty file, the audit log of that file in Message Audit Log showed only 3 Steps of file converted to XML format, no data found so not generating message, deletion of my empty file.
Can anybody suggest how to enable my J2EE adapter module as i have created this module so that if i give empty file, then in the adapter i am creating a dummy XML for my message.
Thanks and Regards,
Rajeev Gupta

Hi Stefan,
1. JNDI name in visual admin is CustomerMeter
2. the files in .ear file are:
libraries,
ejb project file,
META-INF folder
in ejb project file the following files are there:
ejb-j2ee-engine.xml
ejb-jar.xml
CustomerMeter.class
Please tell what to do now.
Hi Amol,
in audit log only 3 messages are coming: File converted to XML format, no data in document so not sending message, deleting of empty file.
i have given audit log statements in java class but my audit-log statements are not coming in the audit log
this means my adapter module is not getting invoked.
Please tell what to do to correct this error.
Thanks and Regards,
Rajeev Gupta

Javascript method for clientListener not getting invoked

Hi, I am trying to use a clientListener to call a javascript method when an image that's linked gets clicked on, but the javascript method is not getting invoked. I'm using Jdev 11g. E.g.
<af:resource type="javascript">
function sayhello(event) {
event.cancel();
alert("hello");
</af:resource>
<af:goLink id="gl1">
<af:clientListener type="click" method="sayhello"/>
<af:image id="i1" source="/image/test.gif"/>
</af:goLink>The sayhello javascript method does not get invoked when clicking the linked image. What I found though is that if I change the <af:goLink> to the following, then the javascript method gets invoked:
<af:goLink id="gl1" text="click me">
<af:clientListener type="click" method="sayhello"/>
</af:goLink>I want to have a linked image though instead of linked text. Any suggestions to make this work? In Jdev 10g, the following worked fine for me:
<af:goLink onclick="sayhello">
<af:objectImage source="/image/test.gif">
</af:goLink>I did try using <af:goImageLink> (with <af:clientListener>) and specify the image using the icon attribute. This worked fine in terms of being able to call the javascript method. However, the problem with using this is that it somehow shifts the image down and this doesn't look good in my UI because I basically have a row of <af:goLink> components that use images and using this <af:goImageLink> shows the image mis-aligned compared to the rest of the linked images.

HI All,
Iin my case, clientLinstene is not working if i use more than one goLink , any body can you help me.
<af:goLink text="Forgot Password?" id="gl1">
                                                    <af:clientListener type="click" method="showPopupFromAction"/>
                                                </af:goLink>
                                            </af:panelFormLayout>
                                        </af:panelGroupLayout>
                                        <af:panelGroupLayout id="pgl4">
                                            <af:spacer width="150" id="s3"/>
                                            <af:outputText value="Choose Language:     " id="ot2"/>
                                            <af:goLink text="Arabic" id="cl1">
                                      <af:clientListener type="click" method="testMethod"/>
                                            </af:goLink>
one popup will call popup and anther will in call bean method that's my requirement. script is
<af:resource type="javascript">
                                                   * Shows a popup from an "action" type event.
                                                   * @param {AdfActionEvent} actionEvent the event being handled
                                                  function showPopupFromAction(actionEvent) {
                                                      actionEvent.cancel();
                                                      var eventSource = actionEvent.getSource();
                                                      var popup = eventSource.findComponent("popupForgetPassword");
                                                      popup.show( {
                                                          align : AdfRichPopup.ALIGN_OVERLAP, alignId : eventSource.getClientId()
                                                </af:resource>
<af:resource type="javascript">
   function testMethod(actionEvent) {
// my stuff here.... I will call server listener method.
</af:resource>
thanks
Palanivel

ValueChangeListner not getting invoked.

Hi
I've implemented autoSuggestBehaviour on inputListOfValues but valueChangeListner is not getting invoked in case I select the first value from the auto suggested items.
And valueChangeListner gets invoked if I select any other value apart from the first suggested value.
Given below is code snippet
<af:inputListOfValues id="useridId"
required="true"
binding="#{backingBeanScope.backing_quoteInfo.useridId}"
popupTitle="Search and Select: #{bindings.Userid.hints.label}"
value="#{bindings.Userid.inputValue}"
label="#{bindings.Userid.hints.label}"
model="#{bindings.Userid.listOfValuesModel}"
columns="20"
shortDesc="#{bindings.Userid.hints.tooltip}"
valueChangeListener="#{backingBeanScope.backing_quoteInfo.customerLovChanged}"
autoSubmit="true"
partialTriggers="::it6"
rendered="#{securityContext.userInRole['insuranceapprovers']}">
<f:validator binding="#{bindings.Userid.validator}"/>
<af:autoSuggestBehavior suggestedItems="#{backingBeanScope.backing_quoteInfo.getSuggestedCustomers}"/>
</af:inputListOfValues>
I'm using JDev 11.1.1.4.0 & IE8/Mozilla11 as the browser.
Thanks,
-Gaurav

valuechangelistener is trigger only when the old value and new value is different .You can validate this scenario inside the value chage listener.
like this
customerLovChanged(ValueChangeListener valu){
System.out.println(""+valu.getOldValue());
System.out.println(""+valu.getNewValue());
}

Concurrent timers are not getting invoked for same timer inf

Do weblogic has some parameter in weblogic deployment descriptor like numAlarmThreads="5" minThreads="1" maxThreads="10" etc
becoz I am facing one problem relating to timer service in EJB
Problem Scope: Concurrent timers are not getting invoked for same timer info (Serializable object containing the details of timer).
Details : I am implementing EJB timer 2.1 and when ejbTimeOut execution of one timer exceeds the interval time, next timeout doesn’t happens till the execution of first ejbTimeOut completes . Ideally the timers should behave in the manner that on every interval the ejbTimeOut should occur no matter the previous timeout is completed or not
for example : consider there is timer T whose timeout occurs every minute, and on every timeout it calls process P, so on every minute ideally container should give call to process P irrespective of the previous status of P (call is complete or not). In our case next call to process P is not happening after timeout also since it is waiting for previous call to P to get completed

You should also cross-post this in the WebLogic EJB forum:
WebLogic Server - EJB

Concurrent timers are not getting invoked for same timer info (Serializable

Problem Scope: Concurrent timers are not getting invoked for same timer info (Serializable object containing the details of timer).
Details : I am implementing EJB timer 2.1 and when ejbTimeOut execution of one timer exceeds the interval time, next timeout doesnt happens till the execution of first ejbTimeOut completes . Ideally the timers should behave in the manner that on every interval the ejbTimeOut should occur no matter the previous timeout is completed or not
for example : consider there is timer T whose timeout occurs every minute, and on every timeout it calls process P, so on every minute ideally container should give call to process P irrespective of the previous status of P (call is complete or not). In our case next call to process P is not happening after timeout also since it is waiting for previous call to P to get completed

You should also cross-post this in the WebLogic EJB forum:
WebLogic Server - EJB

Concurrent timers are not getting invoked for same timer info

Problem Scope: Concurrent timers are not getting invoked for same timer info (Serializable object containing the details of timer).
Details : I am implementing EJB timer 2.1 and when ejbTimeOut execution of one timer exceeds the interval time, next timeout doesn’t happens till the execution of first ejbTimeOut completes . Ideally the timers should behave in the manner that on every interval the ejbTimeOut should occur no matter the previous timeout is completed or not
for example : consider there is timer T whose timeout occurs every minute, and on every timeout it calls process P, so on every minute ideally container should give call to process P irrespective of the previous status of P (call is complete or not). In our case next call to process P is not happening after timeout also since it is waiting for previous call to P to get completed

You should also cross-post this in the WebLogic EJB forum:
WebLogic Server - EJB

Oracle Jobs not getting executed

Hi all,
I am using oracle release 10.2.0.4.0. I have two similar databases and I am trying to run same jobs in two different databases. one is running successfully however when i m trying to submit the same jobs in another database the jobs are getting stuck in DBA_JOBS with below values:
next_date next_sec total_time broken interval failures
15-07-2009 00:00:00 0 N NULL NULL
and jobs are not giving desired result. in fact they are not doing any thing which i am expecting.
there is no change in program level. same program unit is able to submit the job in another database. I have checked the job_queue_processes and value is 10.
I don't have any clue were to check at oracle level. i am pl/sql dev so i don't have much hand on oracle.
here is the program block which is submitting jobs:
Job := 'batch_run.Pr_Process_dup
( ' || chr(39) || CurBranch || chr(39) || '
,' || chr(39) || CurUser || chr(39) || '
sys.dbms_job.submit(jno, job, StartTime, Interval);
commit;
This is the part of function were job is getting submitted.
I don't think there is any issue at program level as it was working fine before and there is no change aswell. also same functions are being used in other database. in fact we are using these objects in front end which is working fine in rest of databases.
We have two databases at same server.I compared all parameters in both instances.
Please help me.

hi
here are the steps which I did.
1. I submitted job using below code.
declare
job1 integer :=0;
begin
sys.dbms_job.submit(job1,'Begin null; end;',sysdate,'');
commit;
end;
here are the values i was getting in DBA_jobs:
next_date 16-07-2009 15:35:20
next_sec 15:35:20
total_time 0
broken N
interval null
failures (no value)
what Begin null; end;
I don't think it was running.
2. After running ur statement:
set serveroutput on;
exec dbms_job.run(9623);
output: PL/SQL procedure successfully completed.
Job was not present in DBA_JOBS so i think Job got executed.
I am clueless what is happening.What should be the cause?why is it not getting executingwhile running inside the pl/sql block?
Thanks
Edited by: sameer wani on Jul 16, 2009 8:52 AM

Result handler not getting invoked on button click - URGENT

Hi Folks,
We are working on a form submit application where we populate the form and finally click on button to submit the completed form. We are using BlazeDs On button click I call java service and expect a response object back to flex UI. We are getting the java call invoked successfully and the log clearly shows that the appropriate objects are returned from java service, however, the result handler is not getting inviked to capture the result in flex mxml. I am in urgent need of your help on this
Code snippet:
<mx:Script>
<![CDATA[
protected
function Service_resultHandler(event:ResultEvent):void
Alert.show(
"event.result.troubleTicketId ::"+event.result.status);
var u:URLRequest = new URLRequest("http://www.adobe.com/flex");navigateToURL(u,
"_blank");
private function faultHandler_exitService(event:FaultEvent):void {Alert.show(event.fault.faultString +
'\n' + event.fault.faultDetail);
var u:URLRequest = new URLRequest("http://www.google.com");navigateToURL(u,
"_blank");
protected
function submit_clickHandler():void
//Alert.show("1");
createTicketForm.setCallDetails_callRegion(FlexUI_callDetails_callRegion);
//Alert.show("2"+FlexUI_callDetails_callRegion);
createTicketForm.setCallDetails_callRegion2(FlexUI_callDetails_callRegion2);
exitService.createTroubleTicket(createTicketForm);
]]>
</mx:Script>
<mx:RemoteObject id="exitService" destination="ExitService" fault="faultHandler_exitService(event)">
<mx:method name="createTroubleTicket" result="Service_resultHandler(event)"/>
</mx:RemoteObject>
<mx:Button
label="submit Ticket" width="65" height="22" textAlign="right" x="904" y="-10" click="submit_clickHandler()" />
My Java service:
public
class ExitService {
public CreateTmsTicketResponse createTroubleTicket(CreateTicketForm createTicketForm){
return
createTmsTicketResponse;}
remoting-config.xml:
<destination id="ExitService">
<properties>
<source>com.qwest.qportal.flex.createTicket.ExitService</source>
</properties>
</destination>

Please refer to below link, hope it helps:
http://forums.asp.net/t/1927214.aspx?The+IListSource+does+not+contain+any+data+sources+
Please ensure that you mark a question as Answered once you receive a satisfactory response.

WebLogic Handler Problem - Handler handleMessage is not getting invoked!

Hi, I am using weblogic 11g and trying to register a handler to log my requests/responses to and from the service. I use Maven to build the project and register the handler as described in the Oracle documents. Here is the handler declaration in the server class that implements the port interface
@HandlerChain(file="handlers.xml")Here is the declaration of the handler class in the handlers.xml
<?xml version="1.0" encoding="UTF-8"?>
<handler-chains xmlns="http://java.sun.com/xml/ns/javaee">
<handler-chain>
    <handler>
      <handler-class>com.mycompany.service.handlers.LogHandler</handler-class>
    </handler>
</handler-chain>
</handler-chains>handlers.xml has been put in a folder structure under resources so that when the war file is generated, it is placed in the same folder as the server class. LogHandler implements SOAPHandler<SOAPMessageContext>
When I deploy the application, the handler gets invoked and the getHeaders method gets called multiple times. But when I call the service with any operation, the handleMessage method is not invoked and the service acts like it doesn't have any handler. Please note that there are other projects that exist in my workspace and use handlers with the same configuration without any issues. As the handler is required for this project and I am running out of options to fix this matter, I appreciate your feedback. Thanks in advance!

Your web.xml file need a servlet-mapping section:<web-app>
<servlet>

<servlet-name>Registration</servlet-name>

<servlet-class>GreetingServlet</servlet-class>
</servlet>
    <servlet-mapping>
        <servlet-name>GreetingServlet</servlet-name>
        <url-pattern>/servlet/GreetingServlet</url-pattern>
    </servlet-mapping>
</web-app>Also, you probably need to put your servlet in a package.

Job not getting invoked on a logical standby instance

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