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From "Kristian Waagan (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DERBY-3312) Local Network Server Performance degradation with 10.2 or later
Date Thu, 06 Nov 2008 08:09:44 GMT

    [ https://issues.apache.org/jira/browse/DERBY-3312?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12645422#action_12645422
] 

Kristian Waagan commented on DERBY-3312:
----------------------------------------

I see.

You can continue using BLOB, I just want to point out that the performance impact will be
higher the smaller the BLOB is.
It would be nice to get some numbers for slightly larger Blobs, as minimal Blobs is the worst
case scenario.

The call to get the length is done to request the exact number of bytes from the server. If
it is removed, we need to change the exit logic in the client side LOB stored procedure method.
Also note that the BLOBs in the reported repro are so small that the repositioning bug shouldn't
affect it.

> Local Network Server Performance degradation with 10.2 or later
> ---------------------------------------------------------------
>
>                 Key: DERBY-3312
>                 URL: https://issues.apache.org/jira/browse/DERBY-3312
>             Project: Derby
>          Issue Type: Bug
>          Components: Network Server, Performance
>    Affects Versions: 10.2.1.6, 10.2.2.0, 10.3.1.4, 10.3.2.1
>         Environment: Intel x86 based server SuSE Linux Enterprise Server 10
> Java(TM) SE Runtime Environment (build 1.6.0_03-b05)
> Derby 10.3.2.1
>            Reporter: Timothy Graf
>         Attachments: LobPerf.java
>
>
> We have a Java based XML-RPC client/server product that incorporates an embedded Derby
database and network server.  Our client uses the derby JDBC ndriver and network client to
connect to the Derby Network Server.
> We recently moved from Cloudscape, which I believe used the 10.1.3.1 Derby code, because
of other issues which seem to be resolved by moving to the latest Derby release.  We have
a very simple database with a simple table.  This table does include BLOBs, however its size
has not been an issue and we limit our records to 500.
> Since moving to the latest release of Derby, version 10.3.2.1, we noticed that our clients
running on the same machine as our server take much longer to retrieve a list of records from
the database.  Our clients running on a remote machine do not seem to have any performance
issues when retrieving the same list of records.
> We start our Network Server in Java through the API so I don't think the Security Manager
is the issue.  I read that performance could be affected by the Security Manager, but according
to the Derby documentation, 
> "The Network Server will not attempt to install a security manager if you start the server
from your application using the programmatic API ..."
> I tried going back several releases of Derby and the performance issue seems to go away
when I run with version 10.1.3.1 of Derby.  However we see the same issue that we saw with
Cloudscape in that we can not turn off connection logging.  We also had stability problems
with the Network Server with Cloudscape.
> We would really prefer to use the latest Derby release however the performance issues
are a sever limitation.  I thought that maybe this was a simple Network Server configuration
issue however after researching this issue I have not found anything from a configuration
standpoint that may help.

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