[jira] Created: (DERBY-4605) Derby Cost Based Optimizer to force the use of index

[Mamatha K.V (JIRA)]

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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