Re: Serious OutOfMemory issue while reading with mysql-connector-j-5.0.7 ...

Hi Robert!

I've tried useCursorFetch=true . According to the documentation that also sets useServerPrepStmts=true - which it did. I confirmed that with the debugger. Did not help.

You can see the options I've tried in the test class that I attached to the original message.

Best regards,
Paul

Robert DiFalco schrieb:
> Have you tried it with:
>
> useServerPrepStmts=true
> useCursorFetch=true
>
> ?
>
> -----Original Message-----
> From: Paul Palaszewski [mailto:paul.palaszewski@bdm-systems.com]
> Sent: Thursday, August 23, 2007 2:32 AM
> To: java@lists.mysql.com
> Subject: Serious OutOfMemory issue while reading with mysql-connector-j-5.0.7 ...
>
> Hi!
>
> Yesterday I was supprised to get an out of memory exception when reading a big table rec by rec without any caching. The program died in stmt.executeQuery(), long before I can do anything with the records.
>
> I've tried different connection options and debugged connector/j ...
> every time code runs into MysqlIO.readAllResults which can not work, if the table has more records than available in the jvm. More interesting - also server side prepared statements run into that readAll-routine?
>
> Tested with
> connector-j-5.0.3 + 5.0.7,
> mysql db 5.0.41 + some older 5.0 on windows.
>
> C:\Test\src>javac -cp ..\..\lib\jdbc\mysql-connector-java-5.0.7-bin.jar
> MySQLRead.java
> C:\Test\src>java -cp ..\..\lib\jdbc\mysql-connector-java-5.0.7-bin.jar;.
> MySQLRead
> Exception in thread "main" java.lang.OutOfMemoryError: Java heap space
> at com.mysql.jdbc.Buffer.getBytes(Buffer.java:198)
> at com.mysql.jdbc.Buffer.readLenByteArray(Buffer.java:318)
> at
> com.mysql.jdbc.MysqlIO.extractNativeEncodedColumn(MysqlIO.java:3567)
> at
> com.mysql.jdbc.MysqlIO.unpackBinaryResultSetRow(MysqlIO.java:3483)
> at com.mysql.jdbc.MysqlIO.nextRow(MysqlIO.java:1391)
> at com.mysql.jdbc.MysqlIO.readSingleRowSet(MysqlIO.java:2369)
> at com.mysql.jdbc.MysqlIO.getResultSet(MysqlIO.java:451)
> at
> com.mysql.jdbc.MysqlIO.readResultsForQueryOrUpdate(MysqlIO.java:2076)
> at com.mysql.jdbc.MysqlIO.readAllResults(MysqlIO.java:1451)
> at
> com.mysql.jdbc.ServerPreparedStatement.serverExecute(ServerPreparedStatement.java:1314)
> at
> com.mysql.jdbc.ServerPreparedStatement.executeInternal(ServerPreparedStatement.java:740)
> at
> com.mysql.jdbc.PreparedStatement.executeQuery(PreparedStatement.java:1448)
> at MySQLRead.main(MySQLRead.java:23)
>
> Regards
> Paul
>
> --
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-- 
--
_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/
_/
_/   BDM Business Data Management GmbH
_/
_/   Firmenbuch: FN 242059w
_/   Gerichtsstand: Landesgericht Wiener Neustadt  
_/   UID: ATU57685758
_/
_/   Grenzgasse 111, Objekt 9/4
_/   2340 Mödling
_/   Tel,Fax: +43 2236 46 393
_/
_/   Ing. Paul Palaszewski, (Hons) B.Sc.
_/   Geschäftsführer
_/   Mobil: +43(650) 37 36 030
_/   E-Mail: paul.palaszewski@bdm-systems.com
_/
_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/
 


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