db-derby-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Georgi Hristov (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DERBY-3892) Query execution hangs
Date Thu, 02 Oct 2008 20:09:46 GMT

    [ https://issues.apache.org/jira/browse/DERBY-3892?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12636445#action_12636445
] 

Georgi Hristov commented on DERBY-3892:
---------------------------------------

Thanks for the quick response and the useful advices. I want to point out that this issue
report do not  target performance regression as desribed in the provided link but simply demonstrates
that the described query just hangs, or lets say that depending on the amount of records in
the table, the time needed for the query to finish rises exponentially. I thought that it
will be interesting for you to try it out locally as from my point of view it is very easy
to set up the environment locally. I've provided the table descriptions, just insert about
100,000 records in each, and run the query. I hoped that by reporting the issue directly to
you, instead of trying to analyze the execution plan or even debug derby's code, I'll finally
reach to the solution/bug fix, but I thought that you can do it faster than me and this is
really important for application delivery date. Please let me know if you will to try it on
your side or will leave me to struggle on my own.  

> Query execution hangs
> ---------------------
>
>                 Key: DERBY-3892
>                 URL: https://issues.apache.org/jira/browse/DERBY-3892
>             Project: Derby
>          Issue Type: Bug
>    Affects Versions: 10.4.1.3, 10.4.2.0
>         Environment: OS: Windows Vista
> Application environment: Java 1.5 Swing Application using Derby DB in the embedded mode
as part of the application.
>            Reporter: Georgi Hristov
>
> Having the following db schema:
> CREATE TABLE Messaged_Users (ACCOUNT_ID VARCHAR(20) NOT NULL, 
>       USER_ID VARCHAR(20) NOT NULL,
>       DATE TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
>       STATUS INT DEFAULT 0,
>       CONSTRAINT PK_ACC_USER_ID PRIMARY KEY (ACCOUNT_ID, USER_ID))
> CREATE TABLE Users (USER_ID VARCHAR(20) NOT NULL CONSTRAINT USER_ID_PK PRIMARY KEY, 
>       USER_NAME VARCHAR(50) NOT NULL)
> with approximately 100,000 records in each table and trying to execute the following
query:
>       PreparedStatement searchStatement = conn.prepareStatement("SELECT b.USER_ID, b.USER_NAME
FROM Users a JOIN Messaged_Users b ON    a.USER_ID=b.USER_ID AND a.ACCOUNT_ID=(?)");
>       searchStatement.setString(1, "5533232");
>       ResultSet foundUsers = searchStatement.executeQuery();
> the executeQuery method actually never ends. I've waited for more than 30 mins and it
didn't finish. I've tried it really many times but without any progress the query just hangs.
I presume that this is definitely a bug in the derby db which should be fixed. Please note
also that this fix is very urgent for us so that we can deliver our application. 
> Thanks in advance for looking into this issue.
>  
>  

-- 
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.


Mime
View raw message