K tomu můžete použít balíček UTL_FILE ve verzi 9i a novější
něco takového:
DECLARE
l_file UTL_FILE.FILE_TYPE;
l_buffer RAW(32767);
l_amount BINARY_INTEGER := 32767;
l_pos NUMBER := 1;
l_blob BLOB;
l_blob_len NUMBER;
BEGIN
SELECT blobcol
INTO l_blob
FROM table
WHERE rownum = 1;
l_blob_len := DBMS_LOB.getlength(l_blob);
-- Open the destination file.
l_file := UTL_FILE.fopen(<location>,<filename>,'wb', 32767);
WHILE l_pos < l_blob_len LOOP
DBMS_LOB.read(l_blob, l_amount, l_pos, l_buffer);
UTL_FILE.put_raw(l_file, l_buffer, TRUE);
l_pos := l_pos + l_amount;
END LOOP;
-- Close the file.
UTL_FILE.fclose(l_file);
END;
/