NontransactionalRead and NontransactionalWrite problem

Question

I have gotten Kodo to work with transactions; however my application does
not need the transactional support and I am trying to turn off the
transactional support to help performance.
In my kodo.properties file I have added:
javax.jdo.option.NontransactionalRead=true
javax.jdo.option.NontransactionalWrite=true
However, this seems to have no effect; when I attempt to perform a
makePersistent() I get the following error:
com.solarmetric.kodo.runtime.UserException: Can only perform operation while
a transaction is active. at
com.solarmetric.kodo.runtime.PersistenceManagerImpl.checkActiveTransaction(P
ersistenceManagerImpl.java:2604) at
com.solarmetric.kodo.runtime.PersistenceManagerImpl.makePersistent(Persisten
ceManagerImpl.java:1379) at
.....rest of the trace
I am using Mysql if that makes a difference.
Is there something else I need to configure to make the nontransactional
stuff work?
As a side note, the performance I am getting is about 50% of the performance
from straight jdbc code (i.e. takes twice as long to do the same thing).
However the jdbc code is not doing the transactional things that Kodo is; so
I am hoping that by turning off the transactional support I will realize
performance that is close enough to straight jdbc.
As another side note, is it possible to convert your newsgroup into a
mailing list? I prefer mailing lists and having to fire up my newsreader to
see if there is anything new on your newsgroup is a less preferred solution
for me.
Thanks,
Steven Balthazor

Answer 1

"Stephen Kim" <[email protected]> wrote in message
news:[email protected]...
My guess is there are some other configuration/usage problems that are
affecting your performance. Can you describe your test case and post your
properties?I have moved all the code into a test case (so that I can isolate it from
any other interactions) and include it in the attached zip file. The
following files are attached:
1. jdo.jdo The jdo metadata
2. kodo.properties The kodo properties I am using
3. Test.java The jdo class for my table
4. KodoTest.java The test cases
5. Results.htm The results that I recorded.
6. test.sql The sql to create the table which I am populating.
Some notes about my setup:
1. I am running this inside a servlet container (Jetty) which configures
the PersistenceManagerFactory and provides a jndi reference point
2. The testing was done using a cactus test suite wrapper which provided a
TestServlet. The results included are not the results from the first run
through; I reran the tests multiple times to allow the JVM to provide any
possible optimizations.
My platform:
Windows XP (current patches)
Java 1.4.1_02
Kodo 2.5.2
The only reason I am benchmarking the two (Jdbc and Kodo) side by side is so
that I can understand if I am doing something stupid on the Kodo side. I am
new to Jdo and I have not found many good references that show the best way
to do things. The queries I have included are fairly simple queries but are
representative of many of the things that my application (Web application)
will need to do, so I need to know how to do them in the best/fastest way
possible. So please feel free to tell me everything I am doing wrong on the
Jdo side of things--I want to learn.
I really want to use Kodo; I have investigated just about every other Tool
out there and the features Kodo provides match my needs perfectly. The
major selling points I see for Kodo:
1. Based on a standard
2. Makes my sql portable -- I have a need to run my application on varying
backend dbs (Mysql, MS-SQL, Oracle) and I don't feel good about doing this
strictly in jdbc. I have been able to run my tests across all three
platforms by changing only the kodo.properties file which is incredibly
fantastic. Also the schematool is a great differentiator; it allows me to
push schema changes out for the different platforms while maintaining one
base schema.
3. Ease of use -- Jdbc requires me to do a great deal more type juggling and
exception handling -- I would prefer not to have to build my own framework
to do these things
Thanks,
Steven Balthazor
begin 666 KodoTest.zip
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