Re: [Hibernate] Re: slow performance on flush

[Christoph S. <ch...@mc...>]

Hey!

The stuff you mention sounds cool, and I already thought about that, but to
my knowledge there's no java api that supports stuff like that. If you know
a api that supports such functionality, please tell me, that would be really
great!

regards
 chris
----- Original Message -----
From: "Juozas Baliuka" <ba...@ce...>
To: "Christoph Sturm" <ch...@mc...>; "Gavin King"
<ga...@ap...>
Cc: "hibernate list" <hib...@li...>
Sent: Monday, November 25, 2002 6:03 PM
Subject: Re: [Hibernate] Re: slow performance on flush


>
> It is better to use some "native" API like "COPY" for long running import,
> some RDBM's support imports without constaint
> checks, SQL parsing ....  , and sometimes "long running import" becomes
very
> "short".
>
> ----- Original Message -----
> From: "Christoph Sturm" <ch...@mc...>
> To: "Gavin King" <ga...@ap...>
> Cc: "hibernate list" <hib...@li...>
> Sent: Monday, November 25, 2002 3:27 PM
> Subject: [Hibernate] Re: slow performance on flush
>
>
> I have a really long running import, and I want to write the records to
the
> db as they come in. Is it save to clear the entries Map after a flush? Or
> would you recommend a different approach?
>
>
>   ----- Original Message -----
>   From: Gavin King
>   To: Christoph Sturm
>   Cc: hibernate list
>   Sent: Monday, November 25, 2002 2:23 PM
>   Subject: Re: slow performance on flush
>
>
>   Yup, all entries are kept in the session cache until you close the
> session. Why would you use this kind of code?? Just flush() once at the
end
> (outside the loop).
>     ----- Original Message -----
>     From: Christoph Sturm
>     To: hib...@li... ; Gavin King
>     Sent: Tuesday, November 26, 2002 12:18 AM
>     Subject: slow performance on flush
>
>
>     Hi all!
>
>     I'm trying to increase the performance of this pseudocode:
>
>     for (j=1;j<100;j++)
>     {
>         for (i=1;i<100;i++)
>         {
>             session.save(class)
>         }
>         session.flush();
>         session.connection().commit();
>     }
>
>
>     Now my problem is that flush doesnt take a constant time, but every
> invocation of flush takes more time than the last one, the more I flush
the
> slower it gets. To me it looks like hibernate keeps the references to the
> flushed objects in the entries map, and doesnt remove them. Is there
> anything I can do about it?
>
>     regards
>      chris
>
>
>
>
>
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