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Re: Questions!

On Wed, 07 Mar 2001, Jonaki Ray wrote:
> Hi,
> 
> Thanks for your reply.
> 
> To answer your question- I am working with Win 2000.
> 
> I had a few other questions:
> 
> 1) Could you elaborate more on the connection pooling concept - I read your
> reply to Prashanth in which you said that ozone assigns a connection to a
> thread for each single request, but I am not clear how 10 actual connections
> are needed to serve 100 servlet threads?

10:100 is just the assumption that 100 active servlet requests (threads) that
run ozone related code are doing 10 real _concurrent_ ozone requests in
parallel. This of course may differ a lot. The point is: at any given point in
time ozone needs just as much connections as there are real _concurrent_
requests. Probably less than 10:1 in most cases.

> 
> 2)What is the difference between the DxLib package and the java.util? Can we use either?
Basically yes. I recommend using java.util.

> 
> 3)I am trying to design a prototype for a library information system. I was
> wondering what is the best way to creat a huge no. of objects? Can we use an
> array (like that used to add parts in AutoImpl in sample oo1) or a vector and
> store the objects in that? Will this create a space issue?

Basicall you can use any collection type. This depends on the type of access
path to the data your application needs (tree, hashtable, etc.)

What is a 'huge number'?

> 
> - On a related note, when I need to do a query, for instance, I need to
> locate a book I guess I can use the vector data structure. I know ozone
> doesn't use a  query language- but is there any other way to query objects?
> Should I use a XML file and use XPATH instead?

Store the books in a TreeMap and use its name as the key. Thus you can search a
book by its name and you also find books with similar name. (this is the reason
why I recommend TreeMap instead of HashMap)


Falko


> 
> Any help would be appreciated!
> 
> Thanks
> Jonaki
> 
> >>> Falko Braeutigam <falko@smb-tec.com> 03/06/01 02:33PM >>>
> Jonaki, the address of the mail list is ozone-users@ozone-db.org ...
> 
> On Mon, 05 Mar 2001, Jonaki Ray wrote:
> > Hi,
> > I am sorry about that. Here is the mail again.
> > 
> > Thanks
> > 
> > Jonaki
> > 
> > Hi,
> > 
> > I just started reading about ozone and it seems really interesting. I have some basic newbie questions:
> > 
> > .I would like to subscribe to this list but the link on the web page ddoesn't seem to be working. Will this email be sufficient or do I need to send an email somewhere else as well?
> Lars maintains the mail lists. Are there any problems, Lars?
> 
> > 
> > . The opp command is working but seems to hang. For ex. if I give
> > oopp CattellImpl I get
> > CattellImpl:
> > creating .\CattellImpl_Proxy.java ...
> > update methods:
> > trying to process Cattell.java... (Cattell.java)
> > trying to process CattellImpl.ocd
> > delete ("int")
> > insert ("int")
> > addParts ("int")
> > connectParts ("int")
> > compiling .\CattellImpl_Proxy.java
> > compiler: javac
> > 
> > and then it seems to hang. If I wait long enough and terminate the process it seems to have compiled and created the proxy file. (I am working on Windows OS).
> Since I don't work on win I don't have an idea whats going on. Did others
> encounter this problem? 
> What version do you use?
> 
> > 
> > . I was working with the samples-oo1 and I noticed that
> > aa) if I give the noGui option, it doesn't seem to take the commandline args.  I finally figured out that if I give the commandline arguments as -benchmark1 -size3 (and so on) and alter the 
> > filterAndApplyArgs( String[] args) method in oo1BenchmarkApp.java ( in org/ozoneDB/tools) it works.
> > the alteration is:
> > benchmarkId = new Integer( args[i].substring[10] ) ).intValue(); and so on for the other args aswell.
> Hmmm... nobody has been complaining about the win start scripts for a long time
> now. Again, do other win users have problems?
> 
> > 
> > b) if I don't give the -noGui option the applet starts but was giving a java.net error:"localhost:3333 not known".
> > I found that in the method actionPerformed( ActionEvent e ) (same file as above) the line
> > 
> > String[] args = {-benchmark=" + test,..,"-host=" + server + ":" + port);  should not have the +port option since it reads the serverHost as localhost:3333 and not as localhost alone.
> > 
> > I wonder if anyone else had the same experience.
> > 
> > . Finally, I was wondering if there are other people who have just started
> > wworking with ozone so that I could exchange these basic issues and questions
> > with them? Most of the questions seem to be from people who have been working
> > with ozone for a longer period:)
> No problem. Send your questions to this list.
> 
> 
> Falko
> -- 
> ______________________________________________________________________
> Falko Braeutigam                              mailto:falko@smb-tec.com 
> SMB GmbH                                        http://www.smb-tec.com
-- 
______________________________________________________________________
Falko Braeutigam                              mailto:falko@smb-tec.com
SMB GmbH                                        http://www.smb-tec.com