Implementing A Group BY outside the database

Guys,
I have out today that I need to provide an implementation which allows dynamic Group by's to be proceessed in Java. I have looked at Hibernate but it does not support what I have in mind.
Ideally I have a result set of 1000 rows (say). I need to be able to add group by as well as aggregation to this result set. This can not be done at the database level.
Any ideas on how to approach - perhaps a database framwork which allows results to be processed.
Thanks

DuffyMo,
I have been visiting this site for well over 2 years and it is good to see you still particpating.
Thank you.
Ideally Hiberante would be great but I could not get anything concrete to work - The reason I ask to do this way - is becuase we are using a Microsoft stored procedure which has all the data in a non aggregarted realtion (table).
My application needs to display this data but there are rules like Grouping which need to be applied.
I think it is very difficuklt to write a group by in Java - Do you have any knowledge of wether Hibernate can process a stored proecdrue, possible many times (since it might be a group by on multiple columns)
Thanks

Similar Messages

Can Discoverer have link to display documents stored outside the database?

I posted a message some time ago called "Possible for Discoverer to display BLOB type documents stored in database?" and got great answer.
Now our customers are asking if it is possible, from Discoverer, to link somehow to a file stored outside the database on the Unix file system and get their computer to display it? Can anyone tell me if this is possible please?
The only thing I've seen in the documentation that may be related is in Oracle Business Intelligence Discoverer Configuration Guide, section 10.6 List of Discoverer user preferences. It says there that Discoverer preference ProtocolList can be set so that Discoverer hyperlinks can be set to use protocols such as telnet, but the default is HTTP, HTTPS, and FTP.
THank you in advance if you can help.
Regards,
Julie.

Hi Rod,
I have tried the second method: "create a Oracle directory pointing to the Unix directory containing the files". I have had success with it, but I'd be grateful if you could advise me if you would have done this the same way as described below:
I put two Word docs and two text docs called clob_test1.txt, clob_test2.txt, blob_test1.doc, blob_test2 in the Unix directory corresponding to an Oracle directory called 'EIF'. I thought an extrenal table was needed so that Discoverer would have an object to write a queruy against. So I created a file called lob_test_data.txt with the following contents:
1,01-JAN-2006,text/plain,clob_test1.txt
2,02-JAN-2006,text/plain,clob_test2.txt
3,01-JAN-2006,application/msword,blob_test1.doc
4,02-JAN-2006,application/msword,blob_test2.
THen I created an external table using the following DDL:
CREATE TABLE jum_temp_lob_tab (
file_id NUMBER(10),
date_content DATE,
mime_type VARCHAR2(100),
blob_content BLOB
ORGANIZATION EXTERNAL
TYPE ORACLE_LOADER
DEFAULT DIRECTORY EIF
ACCESS PARAMETERS
RECORDS DELIMITED BY NEWLINE
BADFILE EIF:'lob_tab_%a_%p.bad'
LOGFILE EIF:'lob_tab_%a_%p.log'
FIELDS TERMINATED BY ','
MISSING FIELD VALUES ARE NULL
file_id CHAR(10),
date_content CHAR(11) DATE_FORMAT DATE MASK "DD-MON-YYYY",
mime_type CHAR(100),
blob_filename CHAR(100)
COLUMN TRANSFORMS (blob_content FROM LOBFILE (blob_filename) FROM (EIF) BLOB)
LOCATION ('lob_test_data.txt')
PARALLEL 2
REJECT LIMIT UNLIMITED
then created a Discoverer End User Layer folder against this external table, and used exactly the same technique as we did for downloading the BLOB from the database table (creating a new folder item containing a URL calling a database procedure which calls the Oracle code to download the doc). THis worked, but sometimes my PC didn't seem to know that the Word docs were Word docs and it needed to launch Word. Other times it did manage to do this OK. It always displayed the two .txt files as HTML docs.
Just wondered if you'd be good enough to critique this approach.
THank you, Julie.

Oracle apex outside the database

What risks or impacts do you think if I plan to implement APEX outside the production database. Basically having a separate database all together and apex running into that seperate database. But a lot of source data is in the production database. So looking into this situation, what are the risks and concerns you might think of?
My team is not comfortable implementing apex inside the production database.

Hi
>
they never install anything on production databases, apex installs a lot of its own objects and they want to keep production bare bones.
>
I can see no real justoification to back this up. Ideally APEX should be running within the database where the data that it is accessing it resides. The objects that APEX creates are contained within its own schema and it doesn't take up much space at all.
By separating the APEX install to a different database, you create a whole new level of configuration headaches and things to go wrong.
>
my concern is about vendor level support and other issues
>
APEX is free as long as the database is sufficiently licensed - you don't need anything additional to have APEX running on a correctly licensed Oracle database.
It appears that 'they' have decided on a blanket rule through fear of breaking something (probably due to something having gone wrong once in the past). This is not the correct way to work. If they took the time to understand the technology that they are administering, they would see that an APEX installation should have pretty much zero impact on the production database.
We successfully run 3 APEX instances on the three production systems, each where the relevant data resides - 2 OLTP databases and a Data Warehouse.
Again, if they can come up with something specific rather than a sweeping statement and a suggestion to do it another way (using db links) with no reasoning or justification - it would be easier to allay their fears.
Cheers
Ben

Decrypting data from Oracle 8.1.7.4 outside the database

I need to decrypt some data that is DES encrypted using Oracle 8i (8.1.7.4) and the DBMS Obfuscation Toolkit, outside of the database where it was encrypted, and I hope someone here might have some hints on how I can achieve that.
I have currently experimented with both encrypting and decrypting the same data using the obfuscation toolbit, Perl (Crypt::CBC / Crypt::EBC) and PHP (mcrypt), getting pretty much identical results from the latter. They do, however, not match what I see using the obfuscation toolkit, so the must be something here I don't quite understand.
From what I have gathered, the obfuscation toolkit encrypts the data using
* CBC
* Initialization vector consisting of 8 chr(0)'s
* Padding using spaces to achieve an encryption string of a multiple of 8 bytes.
Below I'm including 1) The PL/SQL code which is used to encrypt the data (des_encrypt_hex()), 2) the PHP code I used to test encryption. When trying to encode the same string using the obfuscation toolkit and PHP, I end up with completely different HEX values. I have also tried several variations of both this PHP code and the Perl code, using various other kinds of padding and chaining modes, but no luck.
If anyone could give me some pointers as to what I am doing wrong here, I'd be really grateful.
1)
================================================================================
FUNCTION des_encrypt
( string_in in VARCHAR2) RETURN VARCHAR2
IS
l_data varchar2(2000);
key_check_flag number;
l_encrypted_string varchar2(2000);
BEGIN
-- the key and the input data must have a length
-- divisible by eight (the key must be exactly 8 bytes long).
l_data := RPAD(string_in,(TRUNC(LENGTH(string_in)/8)+1)*8,CHR(32));
key_check_flag := mod(length(des_key_string),8);
IF key_check_flag != 0 then
RAISE_APPLICATION_ERROR(-20199,'Key should be 8 char long');
END IF;
-- Encrypt the input string
DBMS_OBFUSCATION_TOOLKIT.DESENCRYPT
( input_string => l_data,
key_string => des_key_string,
encrypted_string => l_encrypted_string);
RETURN l_encrypted_string;
END;
FUNCTION des_encrypt_hex
( string_in in VARCHAR2) RETURN VARCHAR2
IS
l_encrypted_string varchar2(2000);
BEGIN
l_encrypted_string := des_encrypt(string_in);
l_encrypted_string := rawtohex(UTL_RAW.CAST_TO_RAW(l_encrypted_string));
RETURN l_encrypted_string;
END;
===============================================================================
And the way I call it:
DECLARE
     RETURN_VALUE VARCHAR2(2000) := '-';
     STRING_IN VARCHAR2(2000) := '12345678901';
BEGIN
     RETURN_VALUE := KATALOG.PKG_PRKCRYPTO.DES_ENCRYPT_HEX(STRING_IN);
     DBMS_OUTPUT.PUT('RETURN_VALUE: ');
     DBMS_OUTPUT.PUT_LINE(RETURN_VALUE);
     DBMS_OUTPUT.PUT('STRING_IN: ');
     DBMS_OUTPUT.PUT_LINE(STRING_IN);
END;
GO
===============================================================================
2)
<?php
$space = chr(32);
$null = chr(0);
$key = "xxxxxxxx";
$input = "12345678901$space$space$space$space$space";
$iv = "$null$null$null$null$null$null$null$null";
print bin2hex(mcrypt_cbc(MCRYPT_DES, $key, $input, MCRYPT_ENCRYPT, $iv));
?>

I might have been unclear in my initial post, but I do have the DES encryption key used on the Oracle side. If you got that part, then my question would be: Is the Oracle 8.1.7.4 DES encryption incompatible with every other DES encryption implementation out there?

Reference images outside the database

Hi,
I tried to return html content from a pl/sql procedure but the images referenced were missing. Attached please see the part of the coding in the pl/sql procedure. Everything worked except the images. When I specified something like <img src="" />, the image would come up. Whenever I included an inline (or external) stylesheet in the pl/sql procedure, the images were not picked up.
Thanks.
Andy
Here is the code:
CREATE OR REPLACE PROCEDURE test_email AS
ret_code integer := -1;
begin
-- Send email
select db_mail.send_mail('[email protected]',
'test email',
'<html>
<head>
<title></title>
<style type="text/css">
div#pullquote
     background: #fff url(<reference image in another server>) no-repeat;
div#pullquote p
     padding: 0 20px;
div#pullquote h2
margin: 0;
     padding: 20px 20px 0 20px;
     background: url(<reference image in another server>) no-repeat 100% 0;
div#pullquote p.furtherinfo
     text-align: right;
</style>
</head>
<body>

<img src="http://<server name>:7778/i/themes/custom/hrims_logo.gif" alt="" class="left" />
     <div id="pullquote">
<h2></h2>
     <h3>this is a test</h3>
</div>

</body></html>',
'HRiMS',
'text/html')
INTO ret_code
FROM dual;
end test_email;

CREATE OR REPLACE PROCEDURE test_email AS
ret_code integer := -1;
begin
-- Send email
select db_mail.send_mail('[email protected]',
           'test email',
           '<html>
           <head>
           <title></title>
           <style type="text/css">
div#pullquote { background: #fff url(<reference image in another server>) no-repeat; }
div#pullquote p { padding: 0 20px; }
div#pullquote h2 { margin: 0; padding: 20px 20px 0 20px; background: url(<reference image in another server>) no-repeat 100% 0; }
div#pullquote p.furtherinfo { text-align: right; }
           </style>
           </head>
           <body>
           <div id="pullquote"><h2></h2>this is a test</div>
           
           </body></html>',
           'HRiMS',
           'text/html') INTO ret_code FROM dual; end test_email;The database version is 10.2.0.1.0.
I'm trying to use PL/SQL to generate email content in HTML.
Thanks.
Andy

Storing attachments outside the database..??

Hi All,
We are working on R12.1.3 ,OEL 5.4.
My client wants to store the Ebs attachments on to the local file system rather than the database...!!!!
Is it possible to store the FND_LOB attachments to local disk...?
Please guide me...!
Thanks
RB
Edited by: R12DBA on Nov 14, 2010 7:47 AM

I do not know of a way of doing so using base functionality. One way would be to use a custom table that is externally defined, but this would mean a lot of custom code being written and maintained.
The space will be taken up regardless of where the files are stored - on the filesystem or the database. In addition, file stored on the filesystem are susceptible to possible virus attacks, while data in the database is not.
HTH
Srini

Fulltext search of binary files outside of database in SQL 2012/Server 2012

This may be more of a Windows Server 2012 question but I'm not sure.
I have a system that holds large amounts of binary files (pdf, doc, etc.). The files themselves are held outside the database in a folder and a SQL table holds the metadata. I used the Indexing Service available through Windows Server 2008 to
create a catalog called "EFCATALOG" to index the contents of the external folder, then created a linked server called MYIDXS which allowed me to query that external indexing catalog from within SQL with a query like this:
EXEC sp_addlinkedserver MYIDXS, 'Internal App', 'MSIDXS', 'EFCATALOG'
SELECT * FROM MYDOCS
LEFT JOIN OPENQUERY(MYIDXS,'SELECT FILENAME FROM SCOPE() WHERE CONTAINS (''test'')') AS MYTBL
ON MYDOC_FILE_NAME = MYTBL.[FILENAME]
With Windows Server 2012, I'm missing the functionality to create the indexing service catalog. I've added the Windows Search Service and see how I can configure folders for searching, but there is no naming functionality for this and I don't see how
I can get the above query/structure to work in Windows Server 2012/SQL Server 2012 environment. In fact, there isn't much at all online regarding the search service or the relationship back to the older versions in 2008 and before.
Is there any way to continue this structure in 2012? I would like to avoid recoding my application to work with a different structure. I'm afraid that changing everything to work with the FILETABLE/FILESTREAM functionality added in SQL 2012
will be necessary which is fine long term, but not convenient right now.
Thanks in advance for any suggestions/help.

Thank you Fanny Liu, based on your link the syntax has changed dramatically. I need to query SYSTEMINDEX now and the structure is very different. It still seems that this new syntax requires creating a linked server of a different type.
I've tried:
EXEC sp_addlinkedserver @server = 'TEST', @provider = 'Search.CollatorDSO.1', @datasrc = 'SYSTEMINDEX', @srvproduct = '', @provstr='Application=Windows'
SELECT FileName FROM OPENQUERY("TEST", 'SELECT Filename FROM SYSTEMINDEX')
Msg 7302, Level 16, State 1, Line 1
Cannot create an instance of OLE DB provider "Search.CollatorDSO.1" for linked server "TEST".
I've also tried using just "Search.CollatorDSO"as the provider since that is the provider name listed in management studio but basically the same error comes back.
So I have 2 questions:
1) Is it possible for my original process to work in Windows Server 2012 in any way (meaning that the OPENQUERY example I provided can remain relatively unchanged)?
2) If change is necessary using this new SYSTEMINDEX and linked server combination, why is my linked server definition failing? I'm using SQL Server 2012....Microsoft SQL Server 2012 - 11.0.2100.60 (X64)
Feb 10 2012 19:39:15
Copyright (c) Microsoft Corporation
Express Edition (64-bit) on Windows NT 6.2 <X64> (Build 9200: ) (Hypervisor)
Thank you.

Solving "COMMIT business rules" on the database server

Headstart Oracle Designer related white paper
"CDM RuleFrame Overview: 6 Reasons to get Framed"
(at //otn.oracle.com/products/headstart/content.html) says:
"For a number of business rules it is not possible to implement these in the server
using traditional check constraints and database triggers. Below you can find two examples:
Example rule 1: An Order must have at least one Order Line ..."
But, one method exists that allows solving "COMMIT rules" completely on the database level.
That method consists of the possibility of delaying the checking of the declarative constraints (NOT NULL, Primary Key, Unique Key, Foreign Key, Check Constraints) until the commit
(that method was introduced first in the version 8.0.).
E.g. we add the field "num_emps" to the DEPT table, which always has the value of the number
of the belonging EMP rows and add DEFERRED CK which uses the values from that field:
ALTER TABLE dept ADD num_emps NUMBER DEFAULT 0 NOT NULL
UPDATE dept
SET num_emps = (SELECT COUNT (*) FROM emp WHERE emp.deptno = dept.deptno)
DELETE dept WHERE num_emps = 0
ALTER TABLE dept ADD CONSTRAINT dept_num_emps_ck CHECK (num_emps > 0) INITIALLY DEFERRED
Triggers that insure the solving of the server side "COMMIT rules" are fairly simple.
We need a packed variable that is set and reset in the EMP triggers and those value
is read in the bur_dept trigger (of course, we could have place the variable in the package
specification and change/read it directly, thus not needing the package body,
but this is a "cleaner" way to do it):
CREATE OR REPLACE PACKAGE pack IS
PROCEDURE set_flag;
PROCEDURE reset_flag;
FUNCTION dml_from_emp RETURN BOOLEAN;
END;
CREATE OR REPLACE PACKAGE BODY pack IS
m_dml_from_emp BOOLEAN := FALSE;
PROCEDURE set_flag IS
BEGIN
m_dml_from_emp := TRUE;
END;
PROCEDURE reset_flag IS
BEGIN
m_dml_from_emp := FALSE;
END;
FUNCTION dml_from_emp RETURN BOOLEAN IS
BEGIN
RETURN m_dml_from_emp;
END;
END;
CREATE OR REPLACE TRIGGER bir_dept
BEFORE INSERT ON dept
FOR EACH ROW
BEGIN
:NEW.num_emps := 0;
END;
CREATE OR REPLACE TRIGGER bur_dept
BEFORE UPDATE ON dept
FOR EACH ROW
BEGIN
IF :OLD.deptno <> :NEW.deptno THEN
RAISE_APPLICATION_ERROR (-20001, 'Can''t change deptno in DEPT!');
END IF;
-- only EMP trigger can change "num_emps" column
IF NOT pack.dml_from_emp THEN
:NEW.num_emps := :OLD.num_emps;
END IF;
END;
CREATE OR REPLACE TRIGGER air_emp
AFTER INSERT ON emp
FOR EACH ROW
BEGIN
pack.set_flag;
UPDATE dept
SET num_emps = num_emps + 1
WHERE deptno = :NEW.deptno;
pack.reset_flag;
END;
CREATE OR REPLACE TRIGGER aur_emp
AFTER UPDATE ON emp
FOR EACH ROW
BEGIN
IF NVL (:OLD.deptno, 0) <> NVL (:NEW.deptno, 0) THEN
pack.set_flag;
UPDATE dept
SET num_emps = num_emps - 1
WHERE deptno = :OLD.deptno;
UPDATE dept
SET num_emps = num_emps + 1
WHERE deptno = :NEW.deptno;
pack.reset_flag;
END IF;
END;
CREATE OR REPLACE TRIGGER adr_emp
AFTER DELETE ON emp
FOR EACH ROW
BEGIN
pack.set_flag;
UPDATE dept
SET num_emps = num_emps - 1
WHERE deptno = :OLD.deptno;
pack.reset_flag;
END;
If we insert a new DEPT without the belonging EMP, or delete all EMPs belonging to a certain DEPT, or move all EMPs of a certain DEPT, when the COMMIT is issued we get the following error:
ORA-02091: transaction rolled back
ORA-02290: check constraint (SCOTT.DEPT_NUM_EMPS_CK) violated
Disvantage is that one "auxiliary" column is (mostly) needed for each "COMMIT rule".
If we'd like to add another "COMMIT rule" to the DEPT table, like:
"SUM (sal) FROM emp WHERE deptno = p_deptno must be <= p_max_dept_sal"
we would have to add another column, like "dept_sal".
CDM RuleFrame advantage is that it does not force us to add "auxiliary" columns.
We must emphasize that in real life we would not write PL/SQL code directly in the database triggers, but in packages, nor would we directly use RAISE_APPLICATION_ERROR.
It is written this way in this sample only for the code clarity purpose.
Regards
Zlatko Sirotic

Zlatko,
You are right, your method is a way to implement "COMMIT rules" completely on the database level.
As you said yourself, disadvantage is that you need an extra column for each such rule,
while with CDM RuleFrame this is not necessary.
A few remarks:
- By adding an auxiliary column (like NUM_EMPS in the DEPT table) for each "COMMIT rule",
you effectively change the type of the rule from Dynamic (depending on the type of operation)
to a combination of Change Event (for updating NUM_EMPS) and Static (deferred check constraint on NUM_EMPS).
- Deferred database constraints have the following disadvantages:
When something goes wrong within the transaction, then the complete transaction is rolled back, not just the piece that went
wrong. Therefore, it becomes more important to use appropriate commit units.
There is no report of the exact row responsible for the violation nor are further violations either by other rows or of other
constraints reported.
If you use Oracle Forms as a front end application, the errors raised from deferred constraints are not handled very well.
- CDM discourages the use of check constraints. One of the reasons is, that when all tuple rules are placed in the CAPI,
any violations can be reported at the end of the transaction level together with all other rule violations.
A violated check constraint would abort the transaction right away, without the possibility of reporting back other rule violations.
So I think your tip is a good alternative if for some reason you cannot use CDM RuleFrame,
but you'd miss out on all the other advantages of RuleFrame that are mentioned in the paper!
kind regards, Sandra

I have been interested in how lightroom uses the catalog so was poking around a backup of the catalog. I found it rather concerning that although the database (catalog) is pretty well designed, there is no referential integrity defined or enforced.

I have been interested in how lightroom uses the catalog so was poking around a backup of the catalog. I am a database administrator and I found it rather concerning that although the database (catalog) is pretty well designed, there is no referential integrity defined or enforced. This is non-standard practice and could well be the source of corrupt catalogs I have seen many people complain about. I would strongly recommend the developers modify the catalog and adopt best practices if they want to improve the stability of Lightroom and the catalog.

I would imagine that data integrity is not enforced for performance reasons. In a closed environment like LR where the application has complete control over the data, enforcing data integrity may not be worth the performance hit. Often what is done in an environment like this is to have data integrity on in test environments which would expose data integrity bugs but where the impact of performance is low. In "production" it is then turned off to get as much performance as possible. I would say there are many more complaints about performance than corrupt catalogs. And corrupt catalogs are more likely due to interruptions in writing to the catalog (like crashes, backups or dropbox activity while LR is running, etc). Data integrity would not help in these cases as they are outside the databases control.

Xmldom.writetofile - writes it only in the server where the database is....

Is there a workaround that i can create the xml file outside the database server?

You can use java or whatever client technology tools you are using should support some sort of XML processing.

Problem with Opening the Database

Dear All,
I am learning myself Backup And Recovery.
I messed up with Redo Log files and now the database is not opening.
What actually I did is
1) I got 2 redo log groups with I member file in each group.
Group 1 (redo1) & Group 2(redo 2)
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5) Now I Added one group 3 when the database is in mount mode (alter database add logfile group 3 ...)
6) Now when I tried to drop the redo log file, I am getting the below error
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Can Anyone please help me out.
Appreciate any help
Thanks & Regards
Madhu K

Madhu,
Can you try recreating the controlfile ? All it does is resets the redologs (reinitializes them). There wont be any dataloss. You can open the database using "alter database open resetlogs" after you recreate the controlfile.
Have you looked into the backup and recovery case scenarios. They covered loss of redologs also.
Since you are learning by yourself, i hope you are following Official Oracle guides. They are your bible when you practice things for the first time.
http://www.oracle.com/pls/db102/portal.portal_db?selected=4 => Backup and Recovery Section => Backup and Recovery Basics and Backup and Recovery Advanced User's Guide
-Srinivas

Sending Mail Notification From the database server

Hi All,
I want to send the mail notification to any email id from the database server.
I used the in built Package UTL_SMTP(pp_to,pp_from,pp_subject,pp_hostname) but i didn't got the success. Actually i dont know how and what parameters has to pass to this package .
It will great help if some body helps with the an example.
Thanks in Advance

917574 wrote:
I want to send the mail notification to any email id from the database server.Oracle version?
The easiest is to use UTL_MAIL - available from 10g onwards. If you're on 11g, you also need an ACL (Access Control List) entry to allow PL/SQL code to step outside the database and connect to an external server.
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Query to view the support group of a generated ticket in the Database, not the Data Warehouse

Hi,
I need a query to view the support group of a generated ticket, but the query must be useful in the only Database (I don't know what happened in the DW, could be a issue).
Please help me,
Greetings!

it's "possible", in the same way that low temperature fusion and space elevators are "possible". There's nothing conclusively ruling it out, but not something you want to attempt on your own under a time constraint.
The "Active" ServiceManager database is a 5th or 6th normal form dynamic software defined snowflake schema representitive object database. Updating the database directly is strictly unsupported, and
Travis has discouraged people from even trying to read from it. a college of mine does service manager and operations manager databases at a 400+ level full time, and after 2+ years of doing it, he
almost understands the operational database. it's WELL beyond me, and I do Service Manager basically full time.
That being said, if you are brave and only looking for some basic data, you might be able to tease some things out with the SQL management studio and a good grasp of SQL syntax.
for a production environment, you're much better off fixing the DW.

Errors in the OLAP storage engine: An error occurred while processing the indexes for the partition of the measure group of the cube from the database.

Errors in the OLAP storage engine: An error occurred while processing the indexes for the partition of the measure group of the cube from the database.
I have dropped and recreated a fact table to refresh the data as the table is having identity columns. So not able to directly insert data. After that cube is throwing above error.
Please suggest.

Hi Md,
It hard to analyse the issue base on the limited information, Are there any error message on the log? Under C:\Program Files\Microsoft SQL Server\MSAS11.\OLAP\Log (this could be different for your server), there are 3 log files that are generated:
msmdrrv.log
FlightRecorderCurrent.trc
FightRecorderBack.trc
The msmdrrv.log simply points to the other two logs. There might be some detail information for this error. Please provide us the detail information about it, so that we can make further analysis.
Regards,
Charlie Liao
TechNet Community Support

Implementation of double-byte character support in the Database

Hi experts,
There is an oracle 10.2.0.5 standard edition database running on windows platform. The application team needs to add a column of the datatype double byte (chinese characters) to an existing table. By doing so, will we have to change the character set of the database ? Would implementing this cause any impact on the database ?
Is it possible to change the existing single byte column to the double byte column in a table?
Edited by: srp on Dec 18, 2010 2:21 PM

I think you should post your request to Globalization Support forum Globalization Support with following details:
what is the APIs used to write data ?
what are the APIs used to read data ?
what is the client OS ?
what is the value of NLS_LANG environment variable in client environment
Note that command line SQL*Plus under Windows does not display Unicode data: try to use instead SQL Developer.
Example:
1. run in SQL*Plus:
SQL> desc t;
Name                                      Null?    Type
X                                                  NUMBER(38)
Y                                                  NVARCHAR2(10)
SQL> insert into t values(1, unistr('\8349'));
1 row created.
SQL> commit;
Commit complete.
SQL> select * from t;
         X Y
         1 ■
SQL> select dump(y, 1016) from t;
DUMP(Y,1016)
Typ=1 Len=2 CharacterSet=AL16UTF16: 83,49Run in SQL Developer:
select * from t
X                      Y
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Implementing A Group BY outside the database

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