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@xxxxxxxxxxxx>
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@xxxxxxxxx>
*Datum *Montag, 09. Dez. 2019, 9:43 PM
*An: *Noveljic Nenad <nenad.noveljic@xxxxxxxxxxxx>
*Cc: *ORACLE-L (oracle-l@xxxxxxxxxxxxx) <oracle-l@xxxxxxxxxxxxx>
*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@xxxxxxxxxxxx>
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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