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From "Sunitha Kambhampati (JIRA)" <derby-...@db.apache.org>
Subject [jira] Commented: (DERBY-302) Takes over 3 minutes to insert a 500kb String into CLOB
Date Tue, 07 Jun 2005 14:26:41 GMT
    [ http://issues.apache.org/jira/browse/DERBY-302?page=comments#action_12312888 ] 

Sunitha Kambhampati commented on DERBY-302:
-------------------------------------------

For Sun JVM ( 1.4.2 _07) the first insert takes 3 minutes but with IBM jvm 1.4.2 it takes
about 20seconds on my laptop. Further with Sun JVM you can improve performance if you use
the BufferedReader and give a large buffer size to it. 

Adding this as a comment  here so the info is not lost.  I  have just started looking into
this issue, but if someone else has other suggestions etc, please post here/to the list. 


> Takes over 3 minutes to insert a 500kb String into CLOB
> -------------------------------------------------------
>
>          Key: DERBY-302
>          URL: http://issues.apache.org/jira/browse/DERBY-302
>      Project: Derby
>         Type: Bug
>   Components: SQL
>  Environment: Windows XP Professional, Dell Pentium IV
>     Reporter: Glenn Orbon

>
> I downloaded a Cloudescape Version 10 from here http://www-106.ibm.com/developerworks/db2/library/techarticle/dm-0408cline/index.html.
 Not sure exactly which version of 10 this is.
> Would like to store up to a 10MB XML string in a CLOB.  However, I noticed it took over
3 minutes to insert a 500kb string.  I am using the PreparedStatement to get around the 37kb
limitation encountered in a previous issue.  It takes less than 2 seconds to insert a 500kb
string into a CLOB in mySQl.
> Here the snippet:
>       FileReader fr = new FileReader ("sample.txt");  
>       BufferedReader br = new BufferedReader(fr);
>       String record = null;
>       try {
>         while ( (record=br.readLine()) != null ) {
>           bufferStr.append( record );
>       }
>       } catch (IOException e) {
>       //
>       // put your error-handling code here
>       //
>          System.out.println("Error reading file");
>       }
>       System.out.println("Size of inputStr: "+bufferStr.length() );
>       
>       PreparedStatement ps = mm.connection.prepareStatement("INSERT into  documents 
         VALUES (?,?)" );
>       ps.setInt(1, 13 );
>       StringReader reader1 = new StringReader(bufferStr.toString());
>       ps.setCharacterStream(2, reader1, bufferStr.length());
>       System.out.println("Uploading string....");
>       ps.execute();
>       System.out.println("Done uploading string...");
>       mm.connection.commit();
> Thanks for your the help,
> Glenn O.

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