db-derby-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Chris Wilson (JIRA)" <j...@apache.org>
Subject [jira] Created: (DERBY-4971) Query runs 10 times more slowly with optimizer turned ON
Date Thu, 13 Jan 2011 17:15:46 GMT
Query runs 10 times more slowly with optimizer turned ON
--------------------------------------------------------

                 Key: DERBY-4971
                 URL: https://issues.apache.org/jira/browse/DERBY-4971
             Project: Derby
          Issue Type: Bug
          Components: SQL
    Affects Versions: 10.7.1.1
            Reporter: Chris Wilson


Derby takes 10 times as long to execute the attached query on the attached database when the
optimizer is allowed to choose its own join order.

chris@fen-desktop2(tmp)$ cat ij 
#!/bin/sh

DERBY_DIR=/home/chris/.m2/repository/org/apache/derby
DERBY_VER=10.7.1.1
DERBY_JAR=$DERBY_DIR/derby/$DERBY_VER/derby-$DERBY_VER.jar
TOOLS_JAR=$DERBY_DIR/derbytools/$DERBY_VER/derbytools-$DERBY_VER.jar

java -cp $DERBY_JAR:$TOOLS_JAR $OPTIONS org.apache.derby.tools.ij "$@"


chris@fen-desktop2(tmp)$ time ./ij optimizer-on.sql 
ij version 10.7
ij> connect 'jdbc:derby:;databaseName=/tmp/rita.derby;user=rita';
ij> SELECT journey.transport_company AS journey_transport_provider, ...
1 row selected
ij> quit;

real	0m47.459s
user	0m47.067s
sys	0m0.344s

chris@fen-desktop2(tmp)$ time ./ij optimizer-off.sql 
...
real	0m3.913s
user	0m4.100s
sys	0m0.148s



-- 
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