Re: [OJB-developers] ERROR: Server configuration denies access to data source

[Thomas M. <tho...@ho...>]

Hi Ricardo,

I don't think that OJB is slow in general. I have done several=20
performance comparisons against other persistence layer and native JDBC.


To argue with your boss you can do the following:
Let the OJB performance testsuite (build.sh performance) run against=20
your MySql DB.
YOu will definitely see that a native JDBC solution is not much faster.=20
(say 5 to 20 percent)


Of course performance depends a lot on you set up the mapping. The usage=20
of proxies is sometimes helpful. But it always depends on the special=20
requirements of your application.

I hope to get the proxies issues fixed by this week.

For the time beeing you might send me your repository.xml and some of=20
your poor performing code. I will have a look at it.

I hope this will be quick enough!

lots of greetings from Essen, Germany,

Thomas

Ricardo Arg=FCello wrote:

> Hi Thomas,
>=20
> OJB is performing REALLY slow, and I'm begining to have some "problemas=
" with my users...
>=20
> A simple insert or select takes way to much time. I don't think it is a=
 database problem, since MySql is very fast (because of the fact it doesn=
't use transactions or referential integrity :-)
>=20
> I just wanted to know how long do you think it will take you to check t=
he dynamic proxy issue. I believe that OJB + dynamic proxies will be the =
solution for my perfomance problem, but in the mean time, I'm stuck into =
a very uncomfortable situation... My boss is asking me to justify the use=
 of a persistance layer whatsoever! He thinks straight JDBC would have be=
en a better solution... But there is no way I could have finished the pro=
ject on time, if it wasn't for OJB! Thanks Thomas, you have done a GREAT =
job. I only need to make the system respond FAST, and maybe OJB will be u=
sed for every project we work on, from now on...
>=20
> I hope to hear from you soon,
>=20
> Greetings from Quito, Ecuador.
>=20
> Ricardo Arguello
> ri...@ya...
>=20
>=20
>=20
> ----- Original Message -----=20
> From: "Thomas Mahler" <tho...@ho...>
> To: "Ricardo Arg=FCello" <ri...@ya...>
> Cc: "Objectbridge (E-Mail)" <obj...@li...urceforge.=
net>
> Sent: Friday, February 22, 2002 1:02 PM
> Subject: Re: [OJB-developers] ERROR: Server configuration denies access=
 to data source
>=20
>=20
> Hi Ricardo,
>=20
> Ricardo Arg=FCello wrote:
>=20
>=20
>>Hello,
>>
>>Nope, it didn't work.
>>
>=20
>=20
>=20
> Mmh...
>=20
>=20
>=20
>>I'm still getting the same Exception when trying to get an object which=
 has a lot of relations with another objects.
>>
>>This is the Exception (again):
>>
>>
>=20
> <snip>
>=20
> I will have a complete code walkthrough to fix this issue.
> For the time beeing you might consider disabling the use of proxies.
>=20
> Did you run the performance tests? Any results that could be interestin=
g=20
> for us?
> Imho, OJB won't perform bad (even without proxies) for a large range of=
=20
> scenearios.
>=20
> cu,
>=20
> thomas
>=20
>=20
>=20
> _______________________________________________
> Objectbridge-developers mailing list
> Obj...@li...
> https://lists.sourceforge.net/lists/listinfo/objectbridge-developers
>=20
>=20
>=20
>=20
>=20