Accessing Tables via Database Links.

Hello. I have created a database link in order to allow me to access tables that exist in a database separate from the one that APEX exists on. The link seems to work because I can query these tables in the APEX SQL Commands windows by running the following command,
Select * from table_name@database_link;
However, when I try to create an application in Application Builder, these tables do not seem to be accessible. Also, I can't see them in the Object Browser. I believe this problem is related to db permissions of some sort, but don't know how to correct it. Thank you for your help.

Hello:
The kind of view tht you have created is updateable.
You can create an APEX form to do DML against this view much like in the manner you would create a form against a table.
The link below might help
Re: Cannot build form off from view?
Varad

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Using Interactive Report with SQL query accessing tables via db link

Is there a known issue with using the interactive report in version 3.1.2.00.02 with SQL that is accessing tables via a database link? I get the error 'not all variables bound', I do not get this error when using the standard report for the same SQL?
Thanks,
Edited by: [email protected] on May 26, 2009 2:59 PM

Varad,
Good question, failed to check that. In fact there are errors. Dump file c:\oraclexe\app\oracle\admin\xe\bdump\xe_s002_3640.trc
Mon Jun 15 08:48:11 2009
ORACLE V10.2.0.1.0 - Production vsnsta=0
vsnsql=14 vsnxtr=3
Oracle Database 10g Express Edition Release 10.2.0.1.0 - Production
Windows XP Version V5.1 Service Pack 3
CPU : 2 - type 586, 1 Physical Cores
Process Affinity : 0x00000000
Memory (Avail/Total): Ph:1051M/2038M, Ph+PgF:2273M/3934M, VA:1302M/2047M
Instance name: xe
Redo thread mounted by this instance: 1
Oracle process number: 16
Windows thread id: 3640, image: ORACLE.EXE (S002)
*** ACTION NAME:(PAGE 2) 2009-06-15 08:48:11.743
*** MODULE NAME:(APEX:APPLICATION 112) 2009-06-15 08:48:11.743
*** SERVICE NAME:(SYS$USERS) 2009-06-15 08:48:11.743
*** CLIENT ID:(ADMIN:232384011651572) 2009-06-15 08:48:11.743
*** SESSION ID:(24.931) 2009-06-15 08:48:11.743
*** 2009-06-15 08:48:11.743
ksedmp: internal or fatal error
ORA-07445: exception encountered: core dump [ACCESS_VIOLATION] [_LdiDateFromArray+55] [PC:0x608B04F3] [ADDR:0x0] [UNABLE_TO_WRITE] []
Current SQL statement for this session:
select Stage,Procedure,Stp,FW,Reslt,MSG,date_run
from bi_msg_VW@dwitnm
order by 1
----- PL/SQL Call Stack -----
object line object
handle number name
2FE1EA14 1207 package body SYS.DBMS_SYS_SQL
2FE1F064 328 package body SYS.DBMS_SQL
2ABDC520 5097 package body APEX_030200.WWV_RENDER_REPORT3
2BD5E55C 1538 package body APEX_030200.WWV_FLOW_DISP_PAGE_PLUGS
2BD5E55C 366 package body APEX_030200.WWV_FLOW_DISP_PAGE_PLUGS
335BDA88 11190 package body APEX_030200.WWV_FLOW
2BDBD1C8 255 procedure APEX_030200.F
2AB58D10 30 anonymous block
----- Call Stack Trace -----
I didn't include the call stack, it is too large. Now I'm even more puzzled that the IR would work while a sql report would fail.
Bob

JDBC Thin driver doesn't support writing data into remote database via database link

Dear Oracle Guru:
Please confirm: Oracle JDBC thin driver does not support writing data to remote database via database link.
The following errors occur when trying to write data into a remote database via database link through jdbc thin driver:
ORA-03106: fatal two-task communication protocol error
ORA-02063: preceding line from FDBE.PAPDSRAS1
ORA-02063: preceding 2 lines from PA
SQL statement is a prepared statement using a SQL like: insert into mytable@pa (col1,col2) values (?,?).
Thanks.
null

Thanks, Dan.
I still think it is a driver problem, because I can do similar things in a stored procedure or in PL/SQL Developer to copy records from a local database table to a remote database table via database link (insert into mytable@pa select * from mytable). The value for distributed_transactions of our database is 10.

Problems with query via Database-Link (Oracle 7.3.4)

I made the following simple query via database-link.
select count (*) from [email protected]
I got the result in about 200 miliseconds.
Then I4ve tried the following query.
select * from [email protected]
It took about 2 hours end ended with an error message "ORA-03113: end-of-file on communication channel"
So I made another choice
select * from [email protected] where rownum <=1
Took about 200 miliseconds.
So I made the query again an changed only the number of rownums,until I was at rownum <=8
then it went sleeping again(I've canceled the statement because I didn't want to wait 2 hours again).
We made the same things from another server with the same database-link on the same remote server
and we had no problems.
Any Idea???

No, network is OK!
Other links are running, I have also no problems when I connect directly to the remote server.

How can you SELECT via Database Link CLOB data using Application Express?

Customer Issue:
Developer using Oracle's Application Express 3.1. The Developer is trying to SELECT a CLOB datatype column from a remote (10.2.0.3) database, via a database link on her 10.2.0.4 based client Application. The Developer wants to be able to select CLOB data from the remote database which has limitation that she can't make any changes to the remote database.
Developer's Comments:
I do a select and get the error. Getting error ORA-22992: cannot use LOB locators selected from remote tables. So she feels she can't use dbms_lob.substr in this configuration I can do a "select into" but that is for one value. I am trying to run a select statement for a report that brings back more than one row. I do not have permission to change anything on the remote database. I want to access the remote database and multiple tables.
This is not something I work with, would greatly appreciate help or ideas. Is this a limitation of the 3.1; or does she just not have this set up correctly; or should she be using a Collection (if yes, please share example)
Thanks very much,
Pam
Edited by: pmoutrie on Jun 4, 2009 12:01 PM
Hello???
Would really appreciate an answer.
Thanks,
Pam

This may not be a perfect solution for you but it worked for my situation.
I wanted to grab some data from Grid Control's MGMT$JOB_STEP_HISTORY table but I couldnt' create an Interactive Report due to the existance of a CLOB column. I cheated this by creating a view on the GC DB, grabbing the first 4000 characters and turning it into a varchar2 column:
create view test_job_step_history as
select job_Name, target_name, status, start_time, end_time, to_char(substr(output,1,4000)) output
from MGMT$JOB_STEP_HISTORY where trunc(end_time) > trunc(sysdate)-90
In an APEX Interactive Report:
select * from test_job_step_history@GCDB
Granted, the output looks aweful right now but I am only looking for a very particular output (failed, denied, ORA-, RMAN-, etc) so the formatting isn't the most important thing to me right now.
If anyone can improve -- and I'm sure you can -- on this I'd love to hear about it.
Thanks,
Rich

Error while trying to access table using DB Link

Hi All,
I had to access a table in another instance using a DB link. As there was no DB link, I was asked to create one and then access the table.
The below query was used to create DB link on my current instance FDEV:
CREATE PUBLIC DATABASE LINK to_link CONNECT TO apps IDENTIFIED BY appsdev USING 'ABCD';
The DB link gets created successfully and when I query select * from all_db_links on my current instance FDEV, I see the DB link name.
However, when I try to access the table, select * from x_stg@to_link on my current instance FDEV, this is resulting in an error as shown below:
ORA-01017: invalid username/password; logon denied
ORA-02063: preceding line from TO_LINK
The TNS entry looks something like this:
ABCD =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = abc.xx.com)(PORT = 1234))
(ADDRESS = (PROTOCOL = TCP)(HOST = abc.xyz.com)(PORT = 1234))
(CONNECT_DATA =
(SID = ABCD)
Can someone help me in this regard?
Thanks in Advance!!
Regards,
AB

You are trying to get 2 databases connected... so, you need to insure that FDEV can find and connect to ABCD.
So, from your FDEV database server, you can do 2 things (from command prompt):
1* tnsping ABCD (this will validate that the entry exists in your tnsnames.ora on your FDEV server, and that a valid listener can be found on remote server)
when above command succeeds:
2* sqlplus apps/appsdev@ABCD;
when you have established the connection, then you are SURE that your can connect ABCD database from FDEV database server. It will also validate the username / password combination, create session privilige, account not locked, etc.....
Please check the above, and post here the results.
HTH,
Thierry

ORA-06502: error when inserting into table via db link with long datatype

Folks,
I am getting the following error:
ORA-06502: PL/SQL: numeric or value error: character string buffer too small.
This occurs when an insert is done via a database link into a table that has a LONG data type for one of the columns, and the string contains some carriage returns and or line feeds.
I have checked by removing the db link, and inserting into a local table with identical column data types, where there is no error.
So this might be another db link bug?
So I need to remove the carriage returns and/or line feeds
in my pl/sql block in the page process. I have tried
l_text := REPLACE(l_text, CHR(10), ' ');
l_text := REPLACE(l_text, CHR(13), NULL);
but still getting the ORA-06502. Would really appreciate some advice here, please.
Cheers
KIM

Scott,
Time to 'fess up':
My fault sorry, the error was coming from another page process where I had allowed insufficient string length for one of the variables, and my error message did not identify the page process clearly.
This leads me to make a request for future releases, could the system error messages state which page process caused the problem?
One other thing I notice, and this might be a feature not a fault, the page processes are numbered: "Page Process: 3 of 5". However process 3 is not the 3rd one to be processed, and probably refers to the order in which they are created. Should the number reflect the process order?
Cheers
KIM

Accessing Tables using DB link .

Hello Friends,
I have a development and production env.
I created a public DB link in Development say mylink .
Trying to access the developement table from production using the following command say to access table x
From PROD accessing DEV table x using dblink
select * from x@mylink ;
Got the error as :
ORA-02019: connection description for remote database not found
02019. 00000 - "connection description for remote database not found"
Any idea on this why this error is coming ..
thanks/kumar

I have a development and production env.
I created a public DB link in Development say mylink .
Trying to access the developement table from production using the following command say to access table x
From PROD accessing DEV table x using dblink
select * from x@mylink ;You are trying to execute the query in PROD database. This query uses a DB link which points to the DEV database.
Very simple to understand : Since you are using the DB LINK in PROD database, obviously it should be in PROD area... right?
Just imagine you are using an object (the 'DBLINK') in PROD and it doesn't exist here. Got it?
SELECT * FROM x@mylink;
Here,
x -- table in DEV database
mylink -- DB LINK in PROD database (pointing to DEV)
Please try this.
HTH
Edited by: ranit B on Dec 25, 2012 12:24 AM

Query builder: tables from Database Link

Hi APEX people,
Is there a way to use tables from a (remote) Database Link in the Query Builder?
In the Query Builder I seem to have only access to locally (schema) stored tables.
I already tried to define a Synonym for the remote tables I wanted to use, but that didn't work either.
Thanks in advance.
Maurice

Hi,
First of all, can you select from them ie
SELECT *
FROM my_table@my_linkAlso you can't see them as tables in the schema because they're not tables in the schema.
Try creating a view like...
CREATE OR REPLACE FORCE VIEW m_table_vw AS
SELECT *
FROM my_table@my_link;You should be able to see the view in the schema in the query builder and use that.
Cheers
Ben

Proc fails with sqlcheck=full accessing tables across a link to non 11g db

I am trying to compile programs that were upgraded from 9i to 11g and having issues whenever I try to compile code that accesses non 11g databases across a link when sqlcheck is anything other then syntax.
If I have a select such as
select distinct a.ID_NUM, b.value1, b.value2, ...
from table_a a, table_b@external_db b
where a.ID_NUM = b.ID_NUM and a.process_name='REPORTS';
This compiler sits and hangs for a few minutes then aborts. This problem occurs in Pro*C, Pro*Cobol as well as Oracle Forms.
The query works fine under sql*plus. The compiler just can't handle it.
A work around under Pro*C is to use sqlcheck=syntax when compiling any code that accesses across a link. However this isn't a good workaround since it won't catch errors such as a typo in a column. This also won't work in forms, but a work around is to convert the selects into a view. However that isn't a good workaround due to the number of queries that would need changing.
Has anyone else seen this issue and found out what needs changed in the Database for this to work. I tried searching Oracle's web site but couldn't find any solution.
Edited by: user7525803 on Jun 25, 2009 8:10 AM
Edited by: user7525803 on Jun 25, 2009 8:15 AM

ittichai wrote:
Rich,
I searched metalink for your issue. This may be a bug in 3.1 which will be fixed in 4.0. Please see Doc ID 740581.1 Database Link Tables Do NoT Show Up In Table Drop Down List In Apex. There is a workaround mentioned in the document.
I'm not sure why I never thought of searching MetaLink, but thanks for the pointer! It doesn't match my circumstances, however. The Bug smells like a view not being queried in the APEX development tool itself -- i.e. the IDE's coding needs changing, not necessarily those apps created with the IDE.
I'm working on getting you access to my hosted app...
Thanks,
Rich

Query to table in Database Link returns value from local table

Hi
I made a databaselink (Create database link db_a.world connect to db_a identified by <user> using 'db_a.world')
Then I query a table, connected as a user in db_b.world (this is our developer database - identical to db_a): Select count(*) from table@db_a.world.
When I get the result - it comes from the database I am logged in to (db_b)! - This is easy to check, because when I run select count(*) from table - it shows the same number. When I connect to the remote database, the same query shows another (correct) number.
When I created the database link, Oracle demanded a loopback clause. Why is that, and can this be the reason for the strange behaviour?
Thanx
Anders
Narvik, Norway

Hi Anders,
A loopback database link is when you want to test connecting to the same database as say a different user. It can be used for testing purposes. Creating a database link doesn't require a loopback clause. The reason why you are getting the same row count as db_b.world because db_a.world has been created as a loopback link.
In the example you have Create database link db_a.world connect to db_a identified by <user> using 'db_a.world' , the clause after 'connect to' is meant to be the username and the clause after 'identified by' is meant to be the password.
So, create a regular database link like this:
create database link db_a_link connect to <user> identified by <passwd> using <service name>
You shouldn't get an error message that the loopback clause has to be specified. Then try querying and hopefully it will work.
-Raj

Advance Table in advance table via view link

Hi All,
I have implemented advance table in advance table to show details region data by creating View Link between master and child View Object.
I have followed all the steps mention in following link
http://oracleanil.blogspot.com/2010/06/advanced-table-in-advanced-table-via.html
Now when I am using child VO in details table region it is giving me null pointer exception.
Please Help.
Regards,SHD

Any Clue?

Query a remote table with Database Links

How do database links work with ODP.NET? The following code produces an "ORA-02041: client database did not begin a transaction" error on the Fill method.
SQL (in acme instance):
CREATE DATABASE LINK sales.hq.acme.com
CONNECT TO scott IDENTIFIED BY tiger
USING 'sales'
VB .NET:
Dim cn As New OracleConnection("Data Source=acme;User ID=scott;Password=tiger;")
Dim da As New OracleDataAdapter("SELECT * FROM [email protected]", cn)
Dim ds As New DataSet
da.Fill(ds, "RemoteEmp")

Just read running procedure on remote db???
Changed first line to
Dim cn As New OracleConnection("Data Source=acme;User ID=scott;Password=tiger;Enlist=false")
and it works now.
That's what I get for searching the forum instead of browsing.

Error in Creating Advance table within Advanvce Table via view link

Hii all,
i hve created a Advance table within Advanvce Table as given in the developer guide using the Detail functionality of the advance table
im facing the following error................
## Detail 0 ##
java.lang.NullPointerException
at oracle.apps.fnd.framework.webui.OAAdvancedTableHelper.updateInnerTableProperties(OAAdvancedTableHelper.java:1752)
i hve done all the steps as suggested by gurus to implement this Master Detail functionality. Pl help me out if any one had implemented it
thanks in advanve
Pranav

Hi Reetesh,
thanks for the reply...
I hve already created a transient attribute in Master VO attached to the outter advance table and had set this attribute in detail attribute property of outter
advance table. But im facing the same error.
I u hve implemented this pl let me know the correct steps
thanks
Pranav

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Accessing Tables via Database Links.

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