Best practice - caching objects

What is the best practice when many transactions requires a persistent
object that does not change?
For example, in a ASP model supporting many organizations, organization is
required for many persistent objects in the model. I would rather look the
organization object up once and keep it around.
It is my understanding that once the persistence manager is closed the
organization can no longer be part of new transactions with other
persistence managers. Aside from looking it up for every transaction, is
there a better solution?
Thanks in advance
Gary

problem with using object id fields instead of PC object references in your
object model is that it makes your object model less useful and intuitive.
Taking to the extreme (replacing all object references with their IDs) you
will end up with object like a row in JDBC dataset. Plus if you use PM per
HTTP request it will not do you any good since organization data won't be in
PM anyway so it might even be slower (no optimization such as Kodo batch
loads)
So we do not do it.
What you can do:
1. Do nothing special just use JVM level or distributed cache provided by
Kodo. You will not need to access database to get your organization data but
object creation cost in each PM is still there (do not forget this cache we
are talking about is state cache not PC object cache) - good because
transparent
2. Designate a single application wide PM for all your read-only big
things - lookup screens etc. Use PM per request for the rest. Not
transparent - affects your application design
3. If large portion of your system is read-only use is PM pooling. We did it
pretty successfully. The requirement is to be able to recognize all PCs
which are updateable and evict/makeTransient those when PM is returned to
the pool (Kodo has a nice extension in PersistenceManagerImpl for removing
all managed object of a certain class) so you do not have stale data in your
PM. You can use Apache Commons Pool to do the pooling and make sure your PM
is able to shrink. It is transparent and increase performance considerably
One approach we use
"Gary" <[email protected]> wrote in message
news:[email protected]...
>
What is the best practice when many transactions requires a persistent
object that does not change?
For example, in a ASP model supporting many organizations, organization is
required for many persistent objects in the model. I would rather look the
organization object up once and keep it around.
It is my understanding that once the persistence manager is closed the
organization can no longer be part of new transactions with other
persistence managers. Aside from looking it up for every transaction, is
there a better solution?
Thanks in advance
Gary

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I know this sounds like a specific apprequirement,
, but I'm looking for a best practice - what most
people do in this case. It depends but in general I use null.Stupid.Thanks for that insightful comment.
>
I do a lot of database work though. And for that
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Exactly what part of that didn't you follow?
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I've moved your question to the InDesign EPUB forum for best results.

Best practice "changing several related objects via BDT" (Business Data Toolset) / Mehrere verbundene Objekte per BDT ändern

Hallo,
I want to start a
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created. So am searching for a best practices approach how to implement such a
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Hallo
ich möchte an der Stelle eine Diskussion starten um einen Best Practice
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verschiedene abhängige BDT-Objekte geändert werden. Momentan treffen bei uns
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Dominik

OBIEE Best Practice Data Model/Repository Design for Objectives/Targets

Hello World!
We are faced with a design question that has become somewhat difficult and we need some help. We want to be able to compare side-by-side actual measures with their corresponding objectives/targets. Sounds simple. But, our objectives are static (not able to be aggregated) with multi-dimensionality and multi-levels. We need some best practice tips on how to design our data model and repository properly so that we can see the objective/target for a measure regardless of the dimensions that are used in the criteria and regardless of the level.
Here is some more details:
Example of existing objective table.
Dimension1
Dimension2
Dimension3
Obj1
Obj2
Quarter
NULL
NULL
NULL
.99
1.8
1Q13
DIM1VAL1
NULL
NULL
.99
2.4
1Q13
DIM1VAL1
DIM2VAL1
NULL
.98
2.41
1Q13
DIM1VAL1
DIM2VAL1
DIM3VAL1
.97
2.3
1Q13
DIM1VAL1
NULL
DIM3VAL1
.96
1.9
1Q13
NULL
DIM2VAL1
NULL
.97
2.2
1Q13
NULL
DIM2VAL1
DIM3VAL1
.95
2.0
1Q13
NULL
NULL
DIM3VAL1
.94
3.1
1Q13
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Hi,
I want to implement hyperion planning.
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For instance, I have several getter/setters in one of my Value Objects with logic in the setter that uses the value to set values of other properties.
For example, I have a Value Object that has the following properties:
category (of type Category, which is another Value Object with properties "name" and "id")
categoryId (of type int)
categoryUpdated (of type Boolean)
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Hi Eric,
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Robin

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'REQUESTS' is linked to EO 'STATUSES' on: STATUSES.stat_id = REQUESTS.his_status_id
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Using jDeveloper 11.1.2.2.0 if that makes a difference in the solution.
Thanks ahead of time,
CJ

CJ,
I vote for solution 1 as it's just your use case. As you said you what to update the his_status_id and her_status_id through the by selecting a STATUSES.short_txt_descr by a drop down. This is exactly the LOV solution.
ViewLinks are used fro master detail navigation (which you don't do here) and Joining the data make it difficult to update (and you still need a LOV for the drop down box.
Timo

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Al Malin

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Is there any best practice or standard for database object naming ?

Hi
Thank you for reading my post
is there any standard or best practice for databse objects naming ?
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Thanks

what does oracle suggest as a naming schema for tables , fields , views. indexes , tablespaces , ... If you look at the data dictionary you will see that not even Oracle keeps rigidly to any specific standard, although there are tendencies :)
"The nice thing about standards is that there are so many of them to choose from."
-- Andrew Tannenbaum
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Using cache - best practice

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Thanks,
Marcelo

Hello Marcelo,
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http://download-west.oracle.com/docs/cd/B25221_01/web.1013/b13593/cachun.htm#CHEJAEBH
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Re: Only Refresh If Newer Version and ReadObjectQuery
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Chris

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