Cluster config. - toplink cache

hi all!
A simple question...
I've built an application using ADF and toplink.
Actually the application runs on a single IAS.
now, for load reasons, i'll need to migrate to a cluster configuration.
Is there any kind of problem with the toplink cache?
Thanks.
Luca

Similar Messages

Toplink Cache issues in Cluster

Hi
Our production environment is have a clustered environment and we have been noticing the following problem. When a user is trying to save a record she repeatedly encounters the "Toplink-5006" exception that I have included below.
TopLink Error]: 2006.07.19 04:49:23.359--UnitOfWork(115148745)--null--Exception [TOPLINK-5006] (TopLink (WLS CMP) - 10g (9.0.4.2) (Build 040311)): oracle.toplink.exceptions.OptimisticLockException
Exception Description: The object [[email protected]ce459] cannot be updated because it has changed or been deleted since it was last read.
Class> com.rhii.mjplus.fo.people.beans.People_z2e2a7__TopLink_CMP_2_0 Primary Key> [1001280937, 0]
[TopLink Error]: 2006.07.19 04:49:23.359--UnitOfWork(115148745)--null--Exception [TOPLINK-5006] (TopLink (WLS CMP) - 10g (9.0.4.2) (Build 040311)): oracle.toplink.exceptions.OptimisticLockException
Exception Description: The object [[email protected]ce459] cannot be updated because it has changed or been deleted since it was last read.
Class> com.rhii.mjplus.fo.people.beans.People_z2e2a7__TopLink_CMP_2_0 Primary Key> [1001280937, 0]
<Jul 19, 2006 4:49:23 PM PDT> <Error> <EJB> <BEA-010026> <Exception occurred during commit of transaction Name=[EJB com.rhii.mjplus.fo.people.beans.PeopleManagerBean.setPeople(java.util.HashMap,java.lang.String,java.lang.String,java.lang.String,java.util.HashSet,com.rhii.mjplus.common.login.data.UserInfoDO)],Xid=BEA1-795A6481D2E1938A8EAD(115171166),Status=Rolled back. [Reason=Exception [TOPLINK-5006] (TopLink (WLS CMP) - 10g (9.0.4.2) (Build 040311)): oracle.toplink.exceptions.OptimisticLockException
Exception Description: The object [[email protected]ce459] cannot be updated because it has changed or been deleted since it was last read.
Class> com.rhii.mjplus.fo.people.beans.People_z2e2a7__TopLink_CMP_2_0 Primary Key> [1001280937, 0]],numRepliesOwedMe=0,numRepliesOwedOthers=0,seconds since begin=0,seconds left=60,XAServerResourceInfo[weblogic.jdbc.wrapper.JTSXAResourceImpl]=(ServerResourceInfo[weblogic.jdbc.wrapper.JTSXAResourceImpl]=(state=rolledback,assigned=MS15_mjp),xar=weblogic.jdbc.wrapper.JTSXAResourceImpl@6dcf50b),SCInfo[mjp+MS15_mjp]=(state=rolledback),properties=({weblogic.transaction.name=[EJB com.rhii.mjplus.fo.people.beans.PeopleManagerBean.setPeople(java.util.HashMap,java.lang.String,java.lang.String,java.lang.String,java.util.HashSet,com.rhii.mjplus.common.login.data.UserInfoDO)], weblogic.jdbc=t3://10.253.129.56:2323}),OwnerTransactionManager=ServerTM[ServerCoordinatorDescriptor=(CoordinatorURL=MS15_mjp+10.253.129.56:2323+mjp+t3+, XAResources={},NonXAResources={})],CoordinatorURL=MS15_mjp+10.253.129.56:2323+mjp+t3+): Local Exception Stack:
Exception [TOPLINK-5006] (TopLink (WLS CMP) - 10g (9.0.4.2) (Build 040311)): oracle.toplink.exceptions.OptimisticLockException
Exception Description: The object [[email protected]ce459] cannot be updated because it has changed or been deleted since it was last read.
Class> com.rhii.mjplus.fo.people.beans.People_z2e2a7__TopLink_CMP_2_0 Primary Key> [1001280937, 0]
at oracle.toplink.exceptions.OptimisticLockException.objectChangedSinceLastReadWhenUpdating(Ljava/lang/Object;Loracle/toplink/queryframework/ObjectLevelModifyQuery;)Loracle/toplink/exceptions/OptimisticLockException;(OptimisticLockException.java:109)
What is puzzling is that the occurance of this nature has increased with user load and the toplink cache does not seem to have been refreshed after it encounters the first Optimistic Lock exception. We have run several test and this is not reproducabile in the DEV environment where we do not have a clustered set. After making a few updates to a record users starts experiencing the problem ... for some this persist for a really long time.
We do not have Cache synchronization
Cluster setup is as followes
There are 4 boxes and each box has one admin and 4 managed servers.
I have included the toplink-cmp-people.xml ( Thisis the particular entity bean we have a problem with) Our application server is Weblogic and we have Toplink version 9042
<toplink-ejb-jar>
<session>
<name>People</name>
<project-class>
com.rhii.mjplus.fo.people.beans.PeopleToplink
</project-class>
<login>
<datasource>MJPool</datasource>
<non-jts-datasource>MJPool</non-jts-datasource>
</login>
<use-remote-relationships>true</use-remote-relationships>
<customization-class>com.rhii.mjplus.common.TopLinkCustomization
</customization-class>
</session>
</toplink-ejb-jar>
I would appreciate any kind of feedback
Thanks
Lakshmi

Can you refresh that record using a query before you save it ?
Hi
Our production environment is have a clustered
environment and we have been noticing the following
problem. When a user is trying to save a record she
repeatedly encounters the "Toplink-5006" exception
that I have included below.
TopLink Error]: 2006.07.19
04:49:23.359--UnitOfWork(115148745)--null--Exception
[TOPLINK-5006] (TopLink (WLS CMP) - 10g (9.0.4.2)
(Build 040311)):
oracle.toplink.exceptions.OptimisticLockException
Exception Description: The object
[com.rhii.mjplus.fo.people.beans.People_z2e2a7__TopLin
k_CMP_2_0@6dce459] cannot be updated because it has
changed or been deleted since it was last read.
Class>
com.rhii.mjplus.fo.people.beans.People_z2e2a7__TopLink
CMP2_0 Primary Key> [1001280937, 0]
[TopLink Error]: 2006.07.19
04:49:23.359--UnitOfWork(115148745)--null--Exception
[TOPLINK-5006] (TopLink (WLS CMP) - 10g (9.0.4.2)
(Build 040311)):
oracle.toplink.exceptions.OptimisticLockException
Exception Description: The object
[com.rhii.mjplus.fo.people.beans.People_z2e2a7__TopLin
k_CMP_2_0@6dce459] cannot be updated because it has
changed or been deleted since it was last read.
Class>
com.rhii.mjplus.fo.people.beans.People_z2e2a7__TopLink
CMP2_0 Primary Key> [1001280937, 0]
<Jul 19, 2006 4:49:23 PM PDT> <Error> <EJB>
<BEA-010026> <Exception occurred during commit of
transaction Name=[EJB
com.rhii.mjplus.fo.people.beans.PeopleManagerBean.setP
eople(java.util.HashMap,java.lang.String,java.lang.Str
ing,java.lang.String,java.util.HashSet,com.rhii.mjplus
.common.login.data.UserInfoDO)],Xid=BEA1-795A6481D2E19
38A8EAD(115171166),Status=Rolled back.
[Reason=Exception [TOPLINK-5006] (TopLink (WLS CMP) -
10g (9.0.4.2) (Build 040311)):
oracle.toplink.exceptions.OptimisticLockException
Exception Description: The object
[com.rhii.mjplus.fo.people.beans.People_z2e2a7__TopLin
k_CMP_2_0@6dce459] cannot be updated because it has
changed or been deleted since it was last read.
Class>
com.rhii.mjplus.fo.people.beans.People_z2e2a7__TopLink
CMP2_0 Primary Key> [1001280937,
0]],numRepliesOwedMe=0,numRepliesOwedOthers=0,seconds
since begin=0,seconds
left=60,XAServerResourceInfo[weblogic.jdbc.wrapper.JTS
XAResourceImpl]=(ServerResourceInfo[weblogic.jdbc.wrap
per.JTSXAResourceImpl]=(state=rolledback,assigned=MS15
_mjp),xar=weblogic.jdbc.wrapper.JTSXAResourceImpl@6dcf
50b),SCInfo[mjp+MS15_mjp]=(state=rolledback),propertie
s=({weblogic.transaction.name=[EJB
com.rhii.mjplus.fo.people.beans.PeopleManagerBean.setP
eople(java.util.HashMap,java.lang.String,java.lang.Str
ing,java.lang.String,java.util.HashSet,com.rhii.mjplus
.common.login.data.UserInfoDO)],
weblogic.jdbc=t3://10.253.129.56:2323}),OwnerTransacti
onManager=ServerTM[ServerCoordinatorDescriptor=(Coordi
natorURL=MS15_mjp+10.253.129.56:2323+mjp+t3+,
XAResources={},NonXAResources={})],CoordinatorURL=MS15
_mjp+10.253.129.56:2323+mjp+t3+): Local Exception
Stack:
Exception [TOPLINK-5006] (TopLink (WLS CMP) - 10g
(9.0.4.2) (Build 040311)):
oracle.toplink.exceptions.OptimisticLockException
Exception Description: The object
[com.rhii.mjplus.fo.people.beans.People_z2e2a7__TopLin
k_CMP_2_0@6dce459] cannot be updated because it has
changed or been deleted since it was last read.
Class>
com.rhii.mjplus.fo.people.beans.People_z2e2a7__TopLink
CMP2_0 Primary Key> [1001280937, 0]
at
t
oracle.toplink.exceptions.OptimisticLockException.obje
ctChangedSinceLastReadWhenUpdating(Ljava/lang/Object;L
oracle/toplink/queryframework/ObjectLevelModifyQuery;)
Loracle/toplink/exceptions/OptimisticLockException;(Op
timisticLockException.java:109)
What is puzzling is that the occurance of this nature
has increased with user load and the toplink cache
does not seem to have been refreshed after it
encounters the first Optimistic Lock exception. We
have run several test and this is not reproducabile
in the DEV environment where we do not have a
clustered set. After making a few updates to a record
users starts experiencing the problem ... for some
this persist for a really long time.
We do not have Cache synchronization
Cluster setup is as followes
There are 4 boxes and each box has one admin and 4
managed servers.
I have included the toplink-cmp-people.xml ( Thisis
the particular entity bean we have a problem with)
Our application server is Weblogic and we have
Toplink version 9042
<toplink-ejb-jar>
<session>
<name>People</name>
<project-class>
com.rhii.mjplus.fo.people.beans.PeopleToplink
</project-class>
<login>
<datasource>MJPool</datasource>
<non-jts-datasource>MJPool</non-jts-datasource>
</login>
<use-remote-relationships>true</use-remote-relationsh
ips>
<customization-class>com.rhii.mjplus.common.TopLinkCu
stomization
</customization-class>
</session>
</toplink-ejb-jar>
I would appreciate any kind of feedback
Thanks
LakshmiCan you refresh that record using a query before you save it ?

Querying the toplink cache under high-load

We've had some interesting experiences with "querying" the TopLink Cache lately.
It was recently discovered that our "read a single object" method was incorrectly
setting query.checkCacheThenDB() for all ReadObjectQueries. This was brought to light
when we upgraded our production servers from 4 cores to 8. We immediatly started
experiencing very long response times under load.
We traced this down to the following stack: (TopLink version 10.1.3.1.0)
at java.lang.Object.wait(Native Method)
- waiting on <0x00002aab08fd26d8> (a oracle.toplink.internal.helper.ConcurrencyManager)
at java.lang.Object.wait(Object.java:474)
at oracle.toplink.internal.helper.ConcurrencyManager.acquireReadLock(ConcurrencyManager.java:179)
- locked <0x00002aab08fd26d8> (a oracle.toplink.internal.helper.ConcurrencyManager)
at oracle.toplink.internal.helper.ConcurrencyManager.checkReadLock(ConcurrencyManager.java:167)
at oracle.toplink.internal.identitymaps.CacheKey.checkReadLock(CacheKey.java:122)
at oracle.toplink.internal.identitymaps.IdentityMapKeyEnumeration.nextElement(IdentityMapKeyEnumeration.java:31)
at oracle.toplink.internal.identitymaps.IdentityMapManager.getFromIdentityMap(IdentityMapManager.java:530)
at oracle.toplink.internal.queryframework.ExpressionQueryMechanism.checkCacheForObject(ExpressionQueryMechanism.java:412)
at oracle.toplink.queryframework.ReadObjectQuery.checkEarlyReturnImpl(ReadObjectQuery.java:223)
at oracle.toplink.queryframework.ObjectLevelReadQuery.checkEarlyReturn(ObjectLevelReadQuery.java:504)
at oracle.toplink.queryframework.DatabaseQuery.execute(DatabaseQuery.java:564)
at oracle.toplink.queryframework.ObjectLevelReadQuery.execute(ObjectLevelReadQuery.java:779)
at oracle.toplink.queryframework.ReadObjectQuery.execute(ReadObjectQuery.java:388)
We moved the query back to the default, query.checkByPrimaryKey() and this issue went away.
The bottleneck seemed to stem from the read lock on the CacheKey from IdenityMapKeyEnumeration
public Object nextElement() {
if (this.nextKey == null) {
throw new NoSuchElementException("IdentityMapKeyEnumeration nextElement");
// CR#... Must check the read lock to avoid
// returning half built objects.
this.nextKey.checkReadLock();
return this.nextKey;
We had many threads that were having contention while searching the cache for a particular query.
From the stack we know that the contention was limited to one class. We've since refactored that code
not to use a query in that code path.
Question:
Armed with this better knowledge of how TopLink queries the cache, we do have a few objects that we
frequently read by something other than the primary key. A natural key, but not the oid.
We have some other caching mechanisms in place (JBoss TreeCache) to help eliminate queries to the DB
for these objects. But the TreeCache also tries to acquire a read lock when accessing the cache.
Presumably a read lock over the network to the cluster.
Is there anything that can be done about the read lock on CacheKey when querying the cache in a high load
situation?

CheckCacheThenDatabase will check the entire cache for a match using a linear search. This can be efficient if the cache is very large. Typically it is more efficient to access the database if your cache is large and the field you are querying in the database is indexed in the table.
The cache concurrency was greatly improved in TopLink 11g/EclipseLink, so you may wish to try it out.
Supporting indexes in the TopLink/EclipseLink cache is something desirable (feel free to log the enhancement request on EclipseLink). You can simulate this to some degree using a named query and a query cache.
-- James : http://www.eclipselink.org

Toplink Cache problem

I am using JDev of following version "Studio Edition Version 10.1.3.1.0.3984
Build JDEVADF_10.1.3.0_NT_061009.1404.3984".
I had an application with JSF and Toplink and am facing issues with toplink cache mechanism while TESTING IN JDEV . Following is the scenario.
1) When clicking on a link, say 'Get status' , i am querying data from database and displaying in JSF.
2) Later, i am updating particular record.
3) when i click on the link again (Get status), updated data is not gettng reflected.
Here is the code to get data and i am calling this method whenever i am clicking on 'Get status' link.
public Vector getMaintenanceStatusList(){
Vector lockersStatus = null;
try {
Session sess = ToplinkDBUtils.getTopLinkSession();
sess.validateCache();
ReadAllQuery query = new ReadAllQuery();
query.dontCheckCache();
query.dontMaintainCache();
query.setReferenceClass(LockerMaintenanceStatus.class);
query.useDistinct();
lockersStatus = sess.readAllObjects(LockerMaintenanceStatus.class);
} catch (DatabaseException e) {
e.printStackTrace();
//******** Printing the updated value.
for (Iterator i = lockersStatus.iterator();i.hasNext();){
LockerMaintenanceStatus tmp = (LockerMaintenanceStatus)i.next();
System.out.println("Status value :: "+tmp.getStatus());
return lockersStatus;
Here, i am getting old status value for second time though i have updated the database with new status. (scenario if i work in same browser with same toplink session)
i am getting updated values only when i restart the JDEV oc4j.
Please let me know how i can solve the problem.
Thanks!
Veeraswami K

Veeraswami,
In your code you are constructing a query but are not executing it. Instead you are simply calling session.readAllObjects. The result of this call will be the cached versions (based on default cache config).
I would recommend doing:
ReadAllQuery query = new ReadAllQuery(LockerMaintenanceStatus.class);
query.refreshIdentityMapResult();
lockersStatus = (Vector) sess.executeQuery(query);The other settings you had used would bypass the cache and not result in its results being refreshed.
Doug

Toplink cache performance

I have the following problem:
A j2ee struts application deployed over a cluster of 4 application server (10g). Machines Sun Solaris, configured identically with one OC4J container and three processes(3 jvm's). Memory always keeps growing till the max configured in the java options. Which is set to 1,5 Gb (we have tried with a lower Xmx1GB and even Xmx2GB)...
Once that number is hit than the CPU turns high, and the controller ping process of the application server forcefully terminates the process(es) which can not be reached by the ping process.
Load: approximately 1500 users per day, with high degree of updates and inserts.
My question: can the toplink cache,(most of the classes are configured SoftCacheWeakReference) be the cause of this ridiculous memory growth?

Seems like your application has a memory leak somewhere. You may wish to analyze your app servers memory usage with memory profiling tools, such as JProbe memory profiler.
Unless you have a very large cache size, I would not expect the SoftCacheWeakIdentityMap to cause a memory issue. You can verify this by changing your caching type to WeakIdentityMap. Also double check that you are not using a FullIdentityMap anywhere, nor using a very large cache size.
Also verify your application does not holding references to objects and not allowing them to garbage collect.

How to Add Index in Toplink Cache

Hi
We are using toplink as ORM.we are using default cache option (soft cache weak identity)provided by toplink, need to optimize the object retrival from cache, is there any option to create Index ( like database index) on the toplink cache.
Message was edited by:
[email protected]

The TopLink cache is indexed by primary key only. It does not support additional indexes.
Doug

Refresh toplink cache from tirgger

How to update the toplink cache due to change in the database by some external process or procedure?
This question was posted some time back and one of the suggestion was to create a trigger on the table holding the data and implement callout to the toplink cache to refresh. I will appreciate if any one can let me know where I can I find more information to implement such a callout method from trigger on the database table.
We are accessing the toplink objects from OC4J container from where a singleton is managing the calls to the toplink objects. We already have methods in place to refresh the cached object based on timeouts but now the new requirements are to refresh the objects only if the data is changed in the database.
Thanks
Ahmad

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Thank's

Toplink Caching issue

I have three Entities say C1 , P1 and card. Relation between these
entities are like this
P1 to Card ( one - one mapping )
C1 to Card ( one - many mapping )
I have three usecases. Usecase 1 uses the mail Entity C1. It will
create one record using C1. ( keep in mind that there will not be any data for entity card at that time ).
Second usecase , Usecase 2 , uses Entity P1 and creates data in P1 as
well as Card.
Third usecase will again take C1 and try to get the card data which
were inserted through P1.
But unfortunately , it is coming as null ... But if I restart the server and access the third usecase then I'm getting all the card data from C1 Entity which were saved through P1 Entity .
To summarise my finding , issue is with Toplink caching. When i
accessed the first usecase, C1 is cached. In the second usecase , I updated Entity card using P1. When i accessed the third usecase , toplink is returing the cached entity. Toplink is not able to identify whether related entity got changed or not....
Workaround is not to use cache for C1 entity. It is working but it will
not be the correct solution.
any one faced this issue in Toplink ?
Correct me if my findings are not correct...

Hello,
Its not that the cache isn't working, its that you are updating relationships in the database but not in the cache. Take the case of a 1:M from B->C used in a previous response. It looks like the foreign key used in this relationship (in the C table) is mapped to the C object either as a direct to field mapping, or through a 1:1 to the A object. When you change this so that it now somehow points to the B object, you haven't updated the B object to include the C in its collection. Because B has a 1:M mapping collection of Cs, when you next get that B object from the cache, its collection will not contain the newly referenced C (assuming indirection is not used or has been previously triggered). This is a result of you mapping the 1:M in the first place - since it is storing the collection in the object.
If you are going to make changes that affect relationships and yet not update the relationships directly I would suggest either:
A) refreshing affected objects from the database when done. In this case, refreshing the B object will result in TopLink requerying the B->C relation and picking up any changes (depending on your refresh options on the B descriptor though - please check the docs if you need more info).
B) Not mapping these relationships. Instead, when you need to find C objects referenced from B, query for them.
Both options are less efficient as they cause more hits to the database. This is why it would be preferred if you updated the relationships when you change fields that affect those relationships, but it is up to you to decide which will work best for your application.
Please note that the cache is working, in fact the situation you are seeing is due to it working. I am not sure of how your situation would work with DAO as you mentioned in a previous post, but it sounds like it would always hit the database. This situation is a result of you making changes in the database but not changing the object model to reflect those changes, proving that the cache is indeed working. While you mention that some objects are not in your use case, they are in the database but just not mapped in TopLink. In the case of a 1:M mapping, the database shows a 1:1 back relationship that you have not mapped in your object model. So this would be more a case of your object model not matching your database model, and not being taken into account in your use cases.
Best Regards,
Chris

Update issues when ESA Virtual replacing C170 Appliance in Cluster Config

I have opened a TAC ticket on this one but was curious if any others experienced the same issue.
I have C170s in Centralized ClusterConfig. I recently learned about the Virtual ESAs after reading about the EOL for C170s in a few years. I think the Virtual ESAs will add a lot of flexibility. The only issue I've noticed was trying to join Virtual ESAs to our Cluster are updates so far.
The first virtual ESA I brought up I was able to initially update it so it could join the cluster. I thought maybe I messed up the network config somewhere. So after messing with it over the Weekend and opening a TAC case with Cisco. I thought I would try configuring the second Virtual ESA. Sure enough updates are working, and no errors. Hooked it up enough to do some quick testing to make sure the listeners were working. Feeling pretty good about it, I join the cluster. Everything copied over configuration wise, I also setup a new ClusterGroup for the Virtual ESAs so I could customize the listeners and interfaces. Before I got too crazy I quickly realized that my updates stop working on the second virtual appliance.
So just curious if there are some configuration compatibility issues between appliance hardware and Virtual we should be aware of. I found some great information from the Forums about forcing updates and reading the tail of the updater_logs, which produced the following:
Info: Dynamic manifest fetch failure: Received invalid update manifest response
I found the fix for non-cluster configured Virtuals for this Update error:
http://www.cisco.com/c/en/us/support/docs/security/email-security-appliance/118065-maintainandoperate-esa-00.html
But this does not for for clusterconfig.
So is my best course of action to:
run the clusterconfig on one of my virtuals,
Remove Virtual from ClusterConfig after config is migrated
Apply CLI fix to point post-cluster config Virtual so it now points to the right update servers
Create new cluster with the now fully Updating Virtual-Uno ESA
Join Remaining virtuals to the newly created cluster and phase out the old physical cluster?
Obviously I left out all the fine details about MX records, IP addresses, Central Reporting and Spam and outbreak reporting. Just want to make sure I'm not missing something, maybe tare down the old clusterconfig first, set it to point to the update servers in the article above. Then I can phase out my old physicals later on down the line as they break down over time and avoid configuring two clusters for every rule change.

So it looks like I have found the answer to my own question. Looks like the fix in the following article does apply to Virtual ESA in a cluster.
http://www.cisco.com/c/en/us/support/docs/security/email-security-appliance/118065-maintainandoperate-esa-00.html
Some things I'd like to figure out is, will this change stick, will new virtual nodes pick up the incorrect update URL when I join them to the cluster? I made the changes and all my hosts seem to be updating fine. Will wait and see how well they do over the next few days and let them bake in a little before I push e-mail through them.
Step by Step how it looks with a cluster config from the CLI:
(Machine esa1.yourcompany.com)> updateconfig
Service (images):
Update URL:
Feature Key updates
http://downloads.ironport.com/asyncos
RSA DLP Engine Updates
Cisco IronPort Servers
PXE Engine Updates
Cisco IronPort Servers
Sophos Anti-Virus definitions
Cisco IronPort Servers
IronPort Anti-Spam rules
Cisco IronPort Servers
Outbreak Filters rules
Cisco IronPort Servers
Timezone rules
Cisco IronPort Servers
Enrollment Client Updates (used to fetch certificates for URL Filtering)
Cisco IronPort Servers
Cisco IronPort AsyncOS upgrades
Cisco IronPort Servers
Service (list):
Update URL:
RSA DLP Engine Updates
Cisco IronPort Servers
PXE Engine Updates
Cisco IronPort Servers
Sophos Anti-Virus definitions
Cisco IronPort Servers
IronPort Anti-Spam rules
Cisco IronPort Servers
Outbreak Filters rules
Cisco IronPort Servers
Timezone rules
Cisco IronPort Servers
Enrollment Client Updates (used to fetch certificates for URL Filtering)
Cisco IronPort Servers
Service (list):
Update URL:
Cisco IronPort AsyncOS upgrades
Cisco IronPort Servers
Update interval: 5m
Proxy server: not enabled
HTTPS Proxy server: not enabled
Choose the operation you want to perform:
- SETUP - Edit update configuration.
- CLUSTERSET - Set how updates are configured in a cluster
- CLUSTERSHOW - Display how updates are configured in a cluster
[]>dynamichost
Enter new manifest hostname:port
[update-manifests.ironport.com:443]>update-manifests.sco.cisco.com:443
Choose the operation you want to perform:
- SETUP - Edit update configuration.
- CLUSTERSET - Set how updates are configured in a cluster
- CLUSTERSHOW - Display how updates are configured in a cluster
[]>
(Machine esa1.yourcompany.com)> commit

How do I sync Toplink Cache with my Database?

Hey guys,
We are running macro's through an excel sheet that connects to the database and performs Updates and Inserts.
Since this database update is NOT taking place through TopLink (in a Unit of Work) - we do not see the database changes through the web app on the front end unless we bounce our webserver. Presumably the Toplink cache is re-built on start up...so then we can see the changes.
My question is, what can I do to make sure the TopLink cache is aware of the database changes we have made through the macro without having to bounce the server? Is there a re-fresh or sync command that can be run?
This task is sort of a one time thing, so I don't want a solution that involves the cache going to sync itself on a schedule or anything like that. Maybe bouncing is the best solution?
Thoughts?
We are using Toplink 9.0.4
Thanks.

Hello,
Because it is a one time thing, if you can make sure no other TopLink process are going on, you can probably get away with initializeAllIdentityMaps() or the intitializeIdentityMap(Class) methods on the session. These will clear the identity maps, having the obvious draw back of removing all object identity which will cause problems with running processes though. It might be better than bouncing the server - it depends on the application. Logging out of the session and logging back in has the same effect of clearing the cache, but with a bit more overhead. Benifit is that running processes will get errors if they continue to use the session, rather than strange behaviior if they continue to use objects after identity is lost.
Another alternative is to run refresh queries on the data you know might be in the cache or that might have been affected. Drawbacks are that this brings them into the cache if they are not already there.
TopLink 9.0.4 is a quire a few versions back, and in newer versions there is cache invalidation. An object marked as invalid is not removed, so object identity is maintained, but on the next query the data will be refreshed - ensuring subsequent queries will get results from the database without having to be told explicietly to refresh or being set to always refresh. Invalidation can be triggered on particular objects, classes or the entire cache or different policies can be set to set a time to live etc.
Except for bouncing the server or logging out of the session, all of the above leave some possibility that a concurrent user will still have a reference to stale data and continue to use it after the process has run on the database. So I hope you use optimistic locking and that your batch process updates the version to avoid other process from overwriting with stale data.
Best Regards,
Chris

Querying by PK against Toplink Cache

Lets say I have table A that has PK id.
If toplink generates SQL like this:
"select id from A where 1=1 and id=3"
Assuming the data is already cached against that PK, will Toplink retrieve the data from the Toplink cache with this SQL? or since i used 1=1, will it not find it in the cache and require a database retrieval?
Thanks,
Zev.

Doug, thanks for the response. I expected it since we have seen a large increase in SQL. Let me explain the reason for this and maybe you can point us in a better direction.
We generate a Map of CriteriaValue Objects. The in our base object, we iterate over the map and based on the criteria, we build the appropriate expression.
Here is the code for the iteration.
          CriterionValue criterionValueObj;
          selectionExpression = builder.prefixSQL("1=1");
          while (keyIterator.hasNext()) {
               String key = (String) keyIterator.next();
               criterionValueObj = (CriterionValue) criteriaHash.get(key);
               selectionExpression = getExpression(builder, selectionExpression, criterionValueObj, key, firstTimeThroughLoop);
               firstTimeThroughLoop = false;
As you can see, we add a prefix of 1=1. The reason for this is that if this is the first time through the look, we need to say:
ExpressionBuilder builder; //just showing the declaration type
selection = builder.get(key).containsSubstring(value.toString());
if it is the second time through (with conjunction)
ExpressionBuilder builder; //just showing the declaration type
selection = selection.and (builder.get(key).containsSubstring(value.toString()));
so we need two seperate code blocks in this case. A tremendous code minimization in our base class is to say 1=1 AND then it is as if we are always accessing it the second time.
Do you have any suggestions for us? I do not want modify the caching options programitically.
Thanks,
Zev.

Database Change Notification and TopLink Cache Invalidation

Has someone succeeed in implementing the How-to Database Change Notification and TopLink Cache Invalidation.
I have corrected some document errata about the pl/sql content and I manage to have messages in the 'notify_queue'.
I obtain the Topic in Java from this queue.
But the TopicSuscriber instances do not receive any message. Is there something to have in mind to make it work ?
Regards.

Reviving this thread again...
I am using DCN feature to build a middle-tier cache. I know oracle has problem sending physical rowid in case of 'Index Organized Table', however, in normal table also its not able to send proper rowid.
e.g, I have 2 records in Table A with rowid AAARIUAAGAAAV/uABw and AAARIUAAGAAAV/pAAX.
I have updated both the records. Strangely for the first record, oracle is sending INVALID rowid, although for the second record its sending the valid one.
Following is the output:
Row 1: (Wrong rowid being sent, AAARIUAAGAAAV/uABw is replaced with AAARIUAAGAAAXDCAAr)
Connection information : local=localhost.localdomain/127.0.0.1:47633, remote=localhost.localdomain/127.0.0.1:2278
Registration ID         : 2102
Notification version    : 1
Event type              : OBJCHANGE
Database name           : <sid>
Table Change Description (length=1)
    operation=[UPDATE], tableName=<table_name>, objectNumber=70164
    Row Change Description (length=1):
      ROW: operation=UPDATE, ROWID=AAARIUAAGAAAXDCAAr
Row 2: (Right rowid being sent, AAARIUAAGAAAV/pAAX)
Connection information : local=localhost.localdomain/127.0.0.1:47633, remote=localhost.localdomain/127.0.0.1:2278
Registration ID         : 2102
Notification version    : 1
Event type              : OBJCHANGE
Database name           : <sid>
Table Change Description (length=1)
    operation=[UPDATE], tableName=<table_name>, objectNumber=70164
    Row Change Description (length=1):
      ROW: operation=UPDATE, ROWID=AAARIUAAGAAAV/pAAX
Any idea ?

ValueHolder Indirection and TopLink Cache

We have a parent object A (main table) and child object B (a lookup table), mapped thought ValueHolder Indirection.
We use ReadAllQuery to build SQL and retrieve object A(s), and associated B(s).
The query result is used to populate a web page table.
The problem is that when the table is populated, the exact same lookup query against object B is repeated without checking cache. That data field is populated by object_A.object_b.description. For example, below same query would be repeated many times when loading up the web page table:
Select description_id, description from Table_B where description_id = 1
Why the query generated by this Indirection not checking cache? Anyway to force it to check TopLink cache first before querying against database?
Thanks for any help!
Jeffrey

Thanks for the reply.
We use JDeveloper 10.1.3.2. TopLink map in JDev is used to map all table objects and their relationships. So In TopLink map, object(table) A has a ValueHolder object(table) B through indirection. The primary key of B is: description_id, which is used in the table reference mapping.
We use the default TopLink settings in JDev, so object B has below settings in TopLink map:
Identity Map: FullIdentityMap
Size: 50 (there are only about 20 records in this lookup table)
Existence Checking: Check Cache
We don't have any other caching mechanism other than TopLink's. EJB 3.0 is used as service bean, and External Transaction Controller (OC4J) is used.
How to check if B is already in the TopLink cache? I heard ReadAllQuery always goes to database w/o checking TopLink cache, but in the case, the query generated by lazy loading indirection is after the ReadAllQuery execution (when the web page table is loading up).
Jeffrey

Child Objects and TopLink Cache

All,
I have a problem RE the TopLink cache:
Object A has a Vector of Object Bs (1:M) and Object B has a Vector of Object Cs(1:M). I am using ValueHolderInterface and indirection pattern for each of these Vectors.
When I update an Object C, it is not refreshed the next time I read Object A using the readObject(expression). I can see the changes in the database. Can someone tell me the best way to refresh the cache to get the updated Object Cs that belong to Object A.
What I am doing is updating the C objects that belong to object A (thru Vector B) and then retrieving them again in the very next method call. Hope this makes sense!
Thanks!
J

There is something wrong with your test case, I've seen this before -- if you update a C, then without fail the cached version of C is updated and if you have a handle to the cached A that has the B that has the C in question, then you will see the update. It sounds like perhaps you're not actually looking at the cached A, but instead looking at it from a UOW, etc.
Send me an email, it's simply my firstname . lastname at Oracle.com. I'll send you a UOW primer that should help better understand these semantics...
- Don

Manually Refresh Toplink cache

Gurus,
Can we write some servlet which will alllow to manually refresh toplink cache, on click of button.
Do we have to change any settings in session.xml or server.xml.
Please point me in right direction.
Thanks
gbk

There is no straight forward way of refreshing all the objects in the cache (short of looping through all the objects in the cache and manually refreshing them).
The most common approach to this issue is to determine which queries need refreshing and refresh those.
If this solution isn't what you were looking for, please provide more detail and I will be happy to help you further.
Peter

Cluster config. - toplink cache

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