Hello Noel,
Thank you for following up on this.
I thought of this possibility, but do you have any idea why this would
happen only if the server resides on a Windows machine and doesn't happen
when on a Linux machine? Client code is exactly the same no matter what OS
hosts the h2 server database.
Thank you,
Yanni.
On Wednesday, May 8, 2013 10:21:12 AM UTC+3, Noel Grandin wrote:
>
>
> That sounds like your client is timing out for some reason and
> disconnecting from the database.
>
> On 2013-05-07 18:07, Yanni Papadimitriou wrote:
> > Hello,
> >
> > While running the H2 database in remote tcp mode over Windows (Windows
> > 7 to be exact), I have noticed that it becomes unresponsive when
> > multiple queries hit it in short period of time. I have enabled
> > tracing and am seeing logs such as:
> >
> > /*SQL #:1*/CALL LOCK_MODE();
> > 03-28 12:16:29 lock: 2 shared read lock requesting for MY_TABLE_NAME
> > 03-28 12:16:29 jdbc[2]:
> > /*SQL l:50 #:1*/SELECT NAME FROM MY_TABLE_NAME WHERE ID = ? {1: 26};
> > 03-28 12:16:29 jdbc[2]:
> > /*SQL #:1*/CALL LOCK_MODE();
> > 03-28 12:16:29 lock: 2 shared read lock requesting for MY_TABLE_NAME
> > 03-28 12:16:29 jdbc[2]:
> > /*SQL l:50 #:1*/SELECT NAME FROM MY_TABLE_NAME WHERE ID = ? {1: 27};
> > 03-28 12:16:29 jdbc[2]:
> > /*SQL #:1*/CALL LOCK_MODE();
> > 03-28 12:16:29 lock: 2 shared read lock requesting for MY_TABLE_NAME
> > 03-28 12:16:29 jdbc[2]:
> > /*SQL l:50 #:1*/SELECT NAME FROM MY_TABLE_NAME WHERE ID = ? {1: 28};
> > 03-28 12:16:48 jdbc[2]:
> > /*SQL */ROLLBACK;
> > 03-28 12:16:48 database: disconnecting session #2
> > 03-28 12:16:48 database: closing C:/H2/db/data/my_db_name
> > 03-28 12:16:48 lock: 1 shared read lock requesting for LOBS
> > 03-28 12:16:48 lock: 1 shared read lock requesting for LOBS
> >
> > (followed by a few hundreds of logs related to shutting down the
> database)
> >
> > I setup a Red Hat 5 virtual machine over that Windows 7 host,
> > installed H2 database on the Red Hat machine and problem has
> > disappeared. I have also never seen this problem while working in
> > embedded mode on Windows 7 (but maybe this is just because it is
> > running locally?).
> >
> > Is this a known issue for Windows in server mode? Is there any
> > workaround? I have tried with both 1.3.171 and 1.3.165.
> >
> > Thank you in advance,
> > Yanni.
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