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From donaldp <dona...@bluestreaktech.com>
Subject Re: Cannot get derby.language.logQueryPlan to work
Date Fri, 09 May 2008 13:23:24 GMT

Just want to say that I didn't see this specific behavior in my case (I
The log file stays consistent but just doesn't have the statements/plans
This is the same weither I use ij and the server or my app with the embedded


adam jvok wrote:
> Thanks to John for his reply.
> I seem to have found the source of my problem, but it seems to point
> to another issue.
> Previously I had been working in a single terminal window and only
> checking the derby.log after running the query in ij.
> By keeping an eye on the derby.log (in another terminal) while I'm
> using ij, I see what's going on: The derby.log is being written to as
> expected, but when I terminate ij, the derby.log is emptied (zero
> bytes).
> I have tried terminating ij with 'quit;', 'exit;', 'disconnect;
> quit;', 'disconnect; exit;', all with the same result (empty log
> file).
> However, if I terminate ij with ctrl-C or ctrl-D, the log file remains
> intact.
> Why is this?
> Also worth noting:
> - delete derby.log
> - start network server;
> - check log: 502 bytes.
> - run query (in ij);
> - check log: 1303 bytes, content as expected.
> - quit ij
> - check log: 0 bytes
> - run query (in ij);
> - check log: 2104 bytes, first 1303 bytes are null, rest as expected. Odd.
> The upshot is, I can now read what I want from the derby.log but am
> confused by what terminating ij does to the log. Any thoughts?
> On 5/9/08, John Embretsen <John.Embretsen@sun.com> wrote:
>> adam jvok wrote:
>>> I have a similar problem.
>>> I'm using on linux and, following John's advice, yes, I can
>>> get the query plan logged if I use the embedded driver. But I don't
>>> want to use the embedded driver.
>>> So far I have failed to make this work with the network server.
>>> My derby.log remains empty running the same query with the network
>>> server, even with derby.properties containing:
>>> derby.language.logQueryPlan=true
>>> and DERBY_OPTS=-Dderby.language.logQueryPlan=true
>>> Any ideas how to get this to work with the network server?
>> I just tried with the bin\startNetworkServer.bat script as well, having
>> derby.language.logQueryPlan=true in derby.properties, and the query plan
>> ended
>> up in derby.log.
>> In this experiment, I put derby.properties in
>> C:\tmp\john\db-derby-
>> and ran the commands
>> "set DERBY_HOME=c:\tmp\john\db-derby-"
>> and
>> "bin\startNetworkServer.bat"
>> from that directory.
>> Then I connected to the server via IJ using the client driver:
>> "java -jar lib\derbyrun.jar ij"
>> Some questions that may help folks along:
>> How exactly are you starting the server, and from which directory?
>> Are you sure that derby.properties is in the server's "system home"?
>> This is either the network server's working directory, or the directory
>> pointed
>> to by the system property derby.system.home if set.
>> If you add the property
>> derby.drda.logConnections=true
>> to derby.properties, do you see connection logging in the server console
>> after
>> you restart the server and connect to it via JDBC (e.g. IJ)?
>> If you do, the problem is property-specific. If you don't, the server
>> does
>> not
>> seem see your derby.properties file at all.
>> Did you try the "java <properties> -jar derbyrun.jar server start"
>> approach?
>> This makes it more likely that the server sees you settings, in case
>> there
>> are
>> "system home" issues.
>> --
>> John

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