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Date: Thu, 1 Apr 2010 08:17:27 +0000 (UTC)
From: "Knut Anders Hatlen (JIRA)" <jira@apache.org>
To: derby-dev@db.apache.org
Subject: [jira] Commented: (DERBY-4605) Derby Cost Based Optimizer to force
 the use of index
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    [ https://issues.apache.org/jira/browse/DERBY-4605?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12852282#action_12852282 ] 

Knut Anders Hatlen commented on DERBY-4605:
-------------------------------------------

Hi Mamatha,

You need a newline after index=TIILRREP, see the second paragraph and the examples on this manual page: http://db.apache.org/derby/docs/10.5/tuning/ctunoptimzoverride.html

Please direct further questions to the derby-user mailing list (http://db.apache.org/derby/derby_mail.html), as JIRA is reserved for bug reports and requests for new features.

> Derby Cost Based Optimizer to force the use of index
> ----------------------------------------------------
>
>                 Key: DERBY-4605
>                 URL: https://issues.apache.org/jira/browse/DERBY-4605
>             Project: Derby
>          Issue Type: Task
>          Components: Demos/Scripts
>    Affects Versions: 10.5.3.0
>            Reporter: Mamatha K.V
>            Priority: Minor
>             Fix For: 10.5.3.0
>
>
> Hello,
> Please help on the syntax of using Cost Based Optimizer that I am using.
> SELECT count (REPOSITORY_KEY) from TIDLRREP --derby-properties index = TIILRREP where REPOSITORY_KEY like 'S%';
> Column name- REPOSITORY_KEY
> Table - TIDLRREP
> Index name - TIILRREP
> Also tried using - DERBY-PROPERTIES
> When I through a file using java org.apache.derby.tools.ij C:\mysql.sql > C:\GLS\myoutput.txt
> Derby Database Version : db-derby-10.5.3.0-bin
> mysql.sql file contains
> connect 'jdbc:derby:D:\test\PerformanceTest;user=admin;password=password';
> MaximumDisplayWidth 9999;
> CALL SYSCS_UTIL.SYSCS_SET_RUNTIMESTATISTICS(1);
> CALL SYSCS_UTIL.SYSCS_SET_STATISTICS_TIMING(1);
> SELECT count(REPOSITORY_KEY) from TIDLRREP --derby-properties index = TIILRREP where REPOSITORY_KEY like 'S%';
> Error output in myoutput.txt
> ij version 10.5
> ij> connect 'jdbc:derby:D:\test\PerformanceTest;user=admin;password=password';
> ij> MaximumDisplayWidth 9999;
> ij> CALL SYSCS_UTIL.SYSCS_SET_RUNTIMESTATISTICS(1);
> 0 rows inserted/updated/deleted
> ij> CALL SYSCS_UTIL.SYSCS_SET_STATISTICS_TIMING(1);
> 0 rows inserted/updated/deleted
> ij> SELECT count(REPOSITORY_KEY) from TIDLRREP --derby-properties index = TIILRREP where REPOSITORY_KEY like 'S%';;
> ERROR 42Y46: Invalid Properties list in FROM list.  There is no index 'TIILRREP WHERE REPOSITORY_KEY LIKE 'S%';' on table 'TIDLRREP'.
> ij>
> Also I have added  below entries in my derby.properties file
>  
> derby.language.logQueryPlan=true
> derby.optimizer.noTimeout=true
> When I directly the query on ij ... it just hangs!!
> Any help is appreciated.
> Thanks
> Mamatha

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