OJB performance in Cocoon webapp

[mirko <rm...@poczta.of.pl>]

Hi,
I'd like to ask people who are using OJB as a data layer in cocoon web 
apps. Is the performance good, comparable to plain jdbc? I know that 
plain jdbc could be faster but OJB (or other implementations) has 
mechanisms to improve performance (caching, reading db fields on 
demand). I'd like to build medium sized webapp usig OJB and Cocoon but 
I'm worried about performance that OJB would kill it and it would be my 
app's bottle neck.

Regards,
mirko

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Re: OJB performance in Cocoon webapp

[Brian McCallister <mc...@forthillcompany.com>]

The JDO implementation presently in OJB is a big fat special case.

It relies on the JDO reference implementation, which breaks proxies. It 
works, is compliant, and is performant if you don't want any proxies, 
but this usually leads to some nasty memory issues.

On a performance note, the PB has the highest performance numbers as it 
doesn't do things like automatic dirtying. if you go to ODMG or OTM you 
get a bit larger performance hit.

On the other hand, if you always use OJB, or something else that can 
participate in the cache -- allowing you to cache aggressively, you 
will typically see a massive performance boost as OJB makes caching 
much easier than using raw jdbc.

My favorite example of this is an app we have which presently makes an 
obscene number of calls to the database for a couple of page loads. If 
we swap out to OJB using the default cache we can reduce it to 0 
database hits per typical page load as it is frequently used and 
infrequently modified data -- prime for caching but from so many 
different tables that JDBC caching is really had to do for it.

-Brian

On May 4, 2004, at 7:29 AM, mirko wrote:

> Reinhard Poetz wrote:
>> OJB has a performance test suite.
>> Robert posted results here: 
>> http://marc.theaimsgroup.com/?l=ojb-dev&m=108208175512540&w=2
>
> Thanks. I'd like to use JDO api but it wasn't in the test results. If 
> its performance is like the PB's I could accept it.
>
> Regards,
> mirko
>
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Re: OJB performance in Cocoon webapp

[mirko <rm...@poczta.of.pl>]

Reinhard Poetz wrote:
> OJB has a performance test suite.
> Robert posted results here: 
> http://marc.theaimsgroup.com/?l=ojb-dev&m=108208175512540&w=2

Thanks. I'd like to use JDO api but it wasn't in the test results. If 
its performance is like the PB's I could accept it.

Regards,
mirko

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Re: OJB performance in Cocoon webapp

[Reinhard Poetz <re...@apache.org>]

mirko wrote:

> Hi,
> I'd like to ask people who are using OJB as a data layer in cocoon web 
> apps. Is the performance good, comparable to plain jdbc? I know that 
> plain jdbc could be faster but OJB (or other implementations) has 
> mechanisms to improve performance (caching, reading db fields on 
> demand). I'd like to build medium sized webapp usig OJB and Cocoon but 
> I'm worried about performance that OJB would kill it and it would be 
> my app's bottle neck.
>
> Regards,
> mirko


OJB has a performance test suite.
Robert posted results here: 
http://marc.theaimsgroup.com/?l=ojb-dev&m=108208175512540&w=2

HTH

-- 
Reinhard


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