RE: JVM in the database
Date: Mon, 9 Dec 2019 23:08:03 +0000
Message-ID: <473_1575932906_5DEED3EA_473_14080_1_6d8204ab9e964e388d4459d54b9095cd_at_vontobel.com>
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<mailto:backseatdba_at_gmail.com>>
Datum Montag, 09. Dez. 2019, 9:43 PM
An: Noveljic Nenad <nenad.noveljic_at_vontobel.com<mailto:nenad.noveljic_at_vontobel.com>>
Cc: ORACLE-L (oracle-l_at_freelists.org) <oracle-l_at_freelists.org<mailto: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<mailto: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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