[DERBY-4605] Derby Cost Based Optimizer to force the use of index

• Type: Task
• Status: Closed
• Priority: Minor
• Resolution: Invalid
• Affects Version/s: 10.5.3.0
• Fix Version/s: 10.5.3.0
• Component/s: Demos/Scripts
• Urgency: Urgent
• Assignee: Unassigned
• Reporter: Mamatha K.V
• Created: 01/Apr/10 06:35
• Updated: 01/Apr/10 08:18
• Resolved: 01/Apr/10 08:18

Description

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:\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:\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