Setting high-units to zero to turn off the cache

Hi,
I'm looking for an easy way to turn off a cache. If I set high-units to zero does that effectively turn off the cache without side effects?
Thanks,
pat

We have a feature request (COH-599) to do just this, and the solution is tentatively scheduled for the 3.2 release. Here is the description:
"[Client] wants to be able to make a simple config change to see how the app would behave without any cache (i.e. zero-capacity cache)."
Does that sound like what you are looking for?

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JPA -- How can I turn off the caching for an entity?

Hi,
I have a problem that I will illustrate with a simplified example. I have created an entity:
@Entity(name="Customer")
@Table(name="CUSTOMERS")
public class Customer implements Serializable {
}I have also set the collowing properties in persistence.xml:
<property name="toplink.cache.type.default" value="NONE"/>
<property name="toplink.cache.size.default" value="0"/>
<property name="toplink.cache.type.Customer" value="NONE"/>
<property name="toplink.cache.size.Customer" value="0"/>
<property name="toplink.cache.shared.Customer" value="false"/>And then I run the following code:
Customer cust = em.find(Customer.class, 1L);
System.out.println(cust);
cust = em.find(Customer.class, 1L);
System.out.println(cust);The problem: the second call to em.find does NOT generate a query to the database. Here's a fragment from the console log:
[TopLink Fine]: 2007.05.11 02:55:05.656--ServerSession(2030438)--Connection(5858953)--Thread(Thread[Main Thread,5,main])--SELECT ID, SEX, NAME, MANAGER FROM CUSTOMERS WHERE (ID = ?)
bind => [1]
Customer: id=1, name=Customer #1, sex=MALE
Customer: id=1, name=Customer #1, sex=MALECan anyone help me? Why isn't the caching turned off? I tried various combinations of properties. Nothing worked. I was expecting to see two queries to the database. I can see only one.
I tried with TopLink Essentials Version 2 Build 39 and Version 2 Build 41.
Best regards,
Bisser

The cache is likely turned off, but you can't tell because you are using the same transactional EntityManager instance for the two queries. The EntityManager requires its own cache for object identity and transactional purposes, as once you read an object in through the EM, the spec requires that all subsequent reads return the same instance. Only the EntityManager refresh will cause a refresh, that or setting your queries to use the toplink.refresh and toplink.cache-usage query hints.
I would strongly recommend you use a query cache for performance, but there are of course reasons why one might not be the best option.
http://weblogs.java.net/blog/guruwons/archive/2006/09/understanding_t.html
is a good blog on understanding the caching used In TopLin Essentials.
Best Regards,
Chris

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Hello @duleNS
To get your issue more exposure I would suggest posting it in the commercial forums since the HP EliteBook 8770w Mobile Workstation is a commercial product. You can do this here Notebook - HP ProBook, EliteBook, Compaq, Slate/Tablet PC, Armada, LTE
The support page for your product may be helpful in the meantime: HP EliteBook 8770w Mobile Workstation.
I hope this helps!
Thank you for posting on the HP Forums.
Please click the "Kudos, Thumbs Up" at the bottom of this post if you want to say "Thanks" for helping!
Please click "Accept as Solution" if you feel my post solved your issue, it will help others find the solution.
The Great Deku Tree
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Setting high-units to zero to turn off the cache

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