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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