Re: JVM in the database

Hi.

That looks strangely familiar.

https://oracle-base.com/articles/8i/export-blob

At it seems it's my fault your vendor didn't have a limit, because they probably copied me and I don't. :)

From 9i onward you could do it with UTL_FILE instead of a Java stored procedure..

https://oracle-base.com/articles/9i/export-blob-9i

Cheers

Tim...

On Mon, Dec 9, 2019 at 11:08 PM Noveljic Nenad <nenad.noveljic_at_vontobel.com> wrote:

> You‘ve done it correctly by limiting the buffer size for larger blobs. But
> our vendor, unfortunately, didn‘t, so we‘re getting OutOfMemoryError for
> the blobs larger than ~512M. Curiously, this error can‘t be fixed by just
> configuring more memory, as it’s a consequence of some undocumented
> hard-coded limits specific to the database JVM:
>
> https://nenadnoveljic.com/blog/troubleshooting-java-lang-outofmemoryerror-in-the-oracle-database/
>
> Thanks,
> Nenad
>
>
>
> *Von: *Jeff Chirco <backseatdba_at_gmail.com>
> *Datum *Montag, 09. Dez. 2019, 9:43 PM
> *An: *Noveljic Nenad <nenad.noveljic_at_vontobel.com>
> *Cc: *ORACLE-L (oracle-l_at_freelists.org) <oracle-l_at_freelists.org>
> *Betreff: *Re: JVM in the database
>
> Here you go. I found this on the internet years ago so I take no credit no
> do I understand much about it. But it works great.
>
> create or replace and compile java source named blobhandler as
> import java.lang.*;
> import java.sql.*;
> import oracle.sql.*;
> import java.io.*;
> public class BlobHandler {
> public static void ExportBlob(String myFile, BLOB myBlob) throws
> Exception {
> File binaryFile = new File(myFile);
> FileOutputStream outStream = new FileOutputStream(binaryFile);
> InputStream inStream = myBlob.getBinaryStream();
> int size;
> if (myBlob.length()> 20000000) { // tune this to whatever
> appropriate value
> size = 20000000;
> } else {
> size = (int)myBlob.length();
> }
> byte[] buffer = new byte[size];
> int length = -1;
> while ((length = inStream.read(buffer)) != -1)
> {
> outStream.write(buffer, 0, length);
> outStream.flush();
> }
> inStream.close();
> outStream.close();
> }
> }
>
> CREATE OR REPLACE PROCEDURE ExportBlobJava (p_file IN VARCHAR2,
>
> p_blob IN BLOB)
> AS
> LANGUAGE JAVA
> NAME 'BlobHandler.ExportBlob(java.lang.String, oracle.sql.BLOB)';
>
>
>
> On Fri, Dec 6, 2019 at 7:21 AM Noveljic Nenad <nenad.noveljic_at_vontobel.com>
> wrote:
>
>> Hi Jeff,
>>
>>
>>
>> Have you ever processed files larger than 536870895 bytes?
>>
>>
>>
>> Could you share the snippet which writes the BLOB into a file? Do you
>> possibly stream it to an InputStream object, buffer it, and then stream it
>> to the file with the FileOutputStream object?
>>
>>
>>
>> If yes, what’s the buffer size? The code to allocate the buffer should
>> look similar to this:
>>
>>
>>
>> byte[] buffer = new byte[bufferSize];
>>
>>
>>
>> Best regards,
>>
>>
>>
>> Nenad
>>
>>
>>
>> https://nenadnoveljic.com/blog/
>>
>>
>>
>> I use a java procedure to dump blob files to an actual file. We store
>> some PDF's in the database as blob and at times they need to be dumped
>> to a files. Usually its when they want hundreds at time. We found doing
>> this in a loop with PL/SQL was really slow and slower over time. I found a
>> Java procedure to do this and is is super quick.
>>
>> We also have another to get file and directory information. It returned
>> back more information that PL/SQL and also was really fast.
>>
>>
>>
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