Column reference over database link.

Hi,
Is it possible to reference a table column across a database link?
Ex: var1 table.column%TYPE@dblink
Thanks
Chad

Chad,
Glad it worked ..
Taking this thread a step further ..
If you have the privileges to create synonyms then you could do the following:
create synonym mySynonym
for table@dblink
Then use the synonym in the PL/SQL code as follows:
var1 mySynonym.column%TYPE;
This will avoid repetitive typing of table.column@dblink and if the dblink name changes then you have to make the change in only one place - the synonym
Shakti
http://www.impact-sol.com
Developers of Guggi Oracle - Tool for DBAs and Developers

Similar Messages

Interactive report performance problem over database link - Oracle Gateway

Hello all;
This is regarding a thread Interactive report performance problem over database link that was posted by Samo.
The issue that I am facing is when I use Oracle function like (apex_item.check_box) the query slow down by 45 seconds.
query like this: (due to sensitivity issue, I can not disclose real table name)
SELECT apex_item.checkbox(1,b.col3)
, a.col1
, a.col2
FROM table_one a
, table_two b
WHERE a.col3 = 12345
AND a.col4 = 100
AND b.col5 = a.col5
table_one and table_two are remote tables (non-oracle) which are connected using Oracle Gateway.
Now if I run above queries without apex_item.checkbox function the query return or response is less than a second but if I have apex_item.checkbox then the query run more than 30 seconds. I have resolved the issues by creating a collection but it’s not a good practice.
I would like to get ideas from people how to resolve or speed-up the query?
Any idea how to use sub-factoring for the above scenario? Or others method (creating view or materialized view are not an option).
Thank you.
Shaun S.

Hi Shaun
Okay, I have a million questions (could you tell me if both tables are from the same remote source, it looks like they're possibly not?), but let's just try some things first.
By now you should understand the idea of what I termed 'sub-factoring' in a previous post. This is to do with using the WITH blah AS (SELECT... syntax. Now in most circumstances this 'materialises' the results of the inner select statement. This means that we 'get' the results then do something with them afterwards. It's a handy trick when dealing with remote sites as sometimes you want the remote database to do the work. The reason that I ask you to use the MATERIALIZE hint for testing is just to force this, in 99.99% of cases this can be removed later. Using the WITH statement is also handled differently to inline view like SELECT * FROM (SELECT... but the same result can be mimicked with a NO_MERGE hint.
Looking at your case I would be interested to see what the explain plan and results would be for something like the following two statements (sorry - you're going have to check them, it's late!)
WITH a AS
(SELECT /*+ MATERIALIZE */ *
FROM table_one),
b AS
(SELECT /*+ MATERIALIZE */ *
FROM table_two),
sourceqry AS
(SELECT b.col3 x
       , a.col1 y
       , a.col2 z
FROM table_one a
    , table_two b
WHERE a.col3 = 12345
AND   a.col4 = 100
AND   b.col5 = a.col5)
SELECT apex_item.checkbox(1,x), y , z
FROM sourceqry
WITH a AS
(SELECT /*+ MATERIALIZE */ *
FROM table_one),
b AS
(SELECT /*+ MATERIALIZE */ *
FROM table_two)
SELECT apex_item.checkbox(1,x), y , z
FROM table_one a
    , table_two b
WHERE a.col3 = 12345
AND   a.col4 = 100
AND   b.col5 = a.col5If the remote tables are at the same site, then you should have the same results. If they aren't you should get the same results but different to the original query.
We aren't being told the real cardinality of the inners select here so the explain plan is distorted (this is normal for queries on remote and especially non-oracle sites). This hinders tuning normally but I don't think this is your problem at all. How many distinct values do you normally get of the column aliased 'x' and how many rows are normally returned in total? Also how are you testing response times, in APEX, SQL Developer, Toad SQLplus etc?
Sorry for all the questions but it helps to answer the question, if I can.
Cheers
Ben
http://www.munkyben.wordpress.com
Don't forget to mark replies helpful or correct ;)

Report over database link error

Good morning all.
I have a database link LINKA from USERA on LOCALSERVER to USERB on REMOTESERVER.
(create database link LINKA connect to USERB identified by mypassword using validtns)
In USERC on REMOTESERVER I have a TABLEX, with grant all on TABLEX to USERB on REMOTESERVER.
In USERB on REMOTESERVER I have a view TABLEXV, select * from USERC.TABLEX
From USERA on LOCALSERVER I can select * from TABLEXV@LINKA. In fact I can insert/update/delete tablexv from USERA.
I also have a view TABLEXV on USERA, select * from TABLEXV@LINKA. I can also select/insert/update/delete from USERA.TABLEXV.
So far so good - all working as expected.
Then, my APEX app on LOCALSERVER, interactive report, parsing schema USERA, querying TABLEXV, I get the following:
when "Exclude Link Column", I get the error "The requested URL /pls/apex/f was not found on server.
when "Link to Single Row View", report displays correctly.
when "Link to Custom Target", I get the error "The requested URL /pls/apex/f was not found on server.
When I run the select * from TABLEXV as a regular report (i.e. not interactive), I also get the error.
So the only time I get the report displayed correctly is using IR and "Link to Single Row View".
However, clicking on the link (for Single Row View) I get "The requested URL /pls/apex/wwv_flow.show was not found on this server.".
To summarize:
- accessing table via view over database link
- works outside of apex without issue
- inside only works when Link to Single Row View set
- But clicking on link fails
I could live with just having the Link to Singe Row View option if I could disable displaying of the icon so that the user cant click on it.
APEX 3.2.00.27
EE Database - 10.2.0.3 (yes I know out of support)
Remote EE Database - 10.2.0.5
Real object names replaced to protect the innocent!
Anyone got any clues?
I have used remote tables many times in my APEX applications and never had this issue.
Thanks,
Rob @ very confused .com

Good morning all.
I have a database link LINKA from USERA on LOCALSERVER to USERB on REMOTESERVER.
(create database link LINKA connect to USERB identified by mypassword using validtns)
In USERC on REMOTESERVER I have a TABLEX, with grant all on TABLEX to USERB on REMOTESERVER.
In USERB on REMOTESERVER I have a view TABLEXV, select * from USERC.TABLEX
From USERA on LOCALSERVER I can select * from TABLEXV@LINKA. In fact I can insert/update/delete tablexv from USERA.
I also have a view TABLEXV on USERA, select * from TABLEXV@LINKA. I can also select/insert/update/delete from USERA.TABLEXV.
So far so good - all working as expected.
Then, my APEX app on LOCALSERVER, interactive report, parsing schema USERA, querying TABLEXV, I get the following:
when "Exclude Link Column", I get the error "The requested URL /pls/apex/f was not found on server.
when "Link to Single Row View", report displays correctly.
when "Link to Custom Target", I get the error "The requested URL /pls/apex/f was not found on server.
When I run the select * from TABLEXV as a regular report (i.e. not interactive), I also get the error.
So the only time I get the report displayed correctly is using IR and "Link to Single Row View".
However, clicking on the link (for Single Row View) I get "The requested URL /pls/apex/wwv_flow.show was not found on this server.".
To summarize:
- accessing table via view over database link
- works outside of apex without issue
- inside only works when Link to Single Row View set
- But clicking on link fails
I could live with just having the Link to Singe Row View option if I could disable displaying of the icon so that the user cant click on it.
APEX 3.2.00.27
EE Database - 10.2.0.3 (yes I know out of support)
Remote EE Database - 10.2.0.5
Real object names replaced to protect the innocent!
Anyone got any clues?
I have used remote tables many times in my APEX applications and never had this issue.
Thanks,
Rob @ very confused .com

Can we create pl/sql code over database link?

Hi All,
We are using Oracle 9i database.
I want to know if we can create or modify pl/sql code (procedue, package, etc) over the database link? That means - can we create a procedure in remote database using the db link?
Thanks,
Dnyanesh

yes, I can connect to the remote database directly and create/modify the packages.
But I want the users not to create them using the db link.
Is there any way to create the pl/sql package over database link?
Thanks,
Dnyanesh

Run process flow over database link

Hi guys,
I have two projects here, A and B. Each project has its own process flow, lets say Process A (in project A)and process B(in project B). I need to run process B in process A, so I use the database link, and WB_RT_API_EXEC.run_task function. But when I run the process, I get the following error:
ORA-20001: Task not found - Please check the Task Type, Name and Location are correct.
ORA-06512: at "OWBRTR2.WB_RT_API_EXEC", line 704
does anyone have some idea how to fix this? or any other suggestions for how to do it? thanks.

Hi Gowtham,
I am using the following function to send execution details of the process-flow. This process-flow is having 20 mappings. This is working fine.
The cIient requirment is to pass email-IDs from a back-end table(sam_mail_notification) with columns(smtp, from_address and to_address), right now the function is working on static(constant) values.
I had modified the function according to the requirement, can you please have a look at the function, and tell me is it correct. Because the values should come from database table. will this function work.
I got the following error, while deploying,
ORA-06550: line 55, column 1:
PLS-00103: Encountered the symbol "END" when expecting one of the following:
FUNCTION SEND_SUMMARY1()
RETURN NUMBER
--initialize variables here
-- main body
retval number := 0; --default
crlf CONSTANT VARCHAR2(2):= CHR(13) || CHR(10);
pSender VARCHAR2(30) := '[email protected]';
pRecipient VARCHAR2(30) := '[email protected]';
pSubject VARCHAR2(100) := 'Process REsults for: '||to_char(sysdate,'dd/mm/yyyy');
mesg VARCHAR2(32767);
mail_conn utl_smtp.connection;
cursor getResults is
select AREA.OBJECT_NAME,
AREA.CREATED_ON,
AREA.UPDATED_ON,
aramr.ELAPSE_TIME,
NUMBER_RECORDS_SELECTED,
NUMBER_RECORDS_INSERTED,
NUMBER_RECORDS_UPDATED,
NUMBER_ERRORS,
AREA.RETURN_RESULT,
AREA.EXECUTION_AUDIT_STATUS,
MESSAGE_SEVERITY,
MESSAGE_TEXT
from
all_Rt_audit_executions area,
all_Rt_audit_map_runs aramr,
all_rt_audit_exec_messages err
where AREA.execution_audit_id = ARAMR.execution_audit_id(+) AND
AREA.execution_audit_id = err.execution_audit_id(+)
and
trunc(area.created_on) = trunc(sysdate)
AND AREA.OBJECT_NAME IS NOT NULL AND AREA.TASK_TYPE!='ProcessFlow'
AND area.top_level_execution_audit_id =(select max(top_level_execution_audit_id)from all_Rt_audit_executions
where execution_name = (select execution_name from all_Rt_audit_executions where task_type ='ProcessFlow' and top_level_execution_audit_id =
(select max(top_level_execution_audit_id) from all_Rt_audit_executions)));
Cursor getMailDetails is select
mailhost
pSender,
pRecipient
from sam_mail_notification;
BEGIN
for maild in getMailDetails
loop
mail_conn := utl_smtp.open_connection(mailhost, 25);
mesg := 'Date: ' ||TO_CHAR( SYSDATE, 'dd Mon yy hh24:mi:ss') || crlf ||
'From: <'|| pSender ||'>' || crlf ||
'Subject: '|| pSubject || crlf ||
'To: '||pRecipient || crlf || '' || crlf ||
end loop;
'MAPNAME START_TIME END_TIME ELAPSED SELECTED INSERTED UPDATED ERRORS RESULT AUDIT_STSTUS SEVERITY MESSAGE_TEXT'||crlf ;
for rec in getResults
loop
mesg:=mesg || rpad(rec.OBJECT_NAME,30)||
rpad(to_char(rec.CREATED_ON, 'HH24:MI:SS DD-MON-YY'),20)||
rpad(to_char(rec.UPDATED_ON, 'HH24:MI:SS DD-MON-YY'),24)||
rpad(to_char(rec.ELAPSE_TIME),7)||
rpad(to_char(rec.NUMBER_RECORDS_SELECTED),8)||
rpad(to_char(rec.NUMBER_RECORDS_INSERTED),10)||
rpad(to_char(rec.NUMBER_RECORDS_UPDATED),10)||
rpad(to_char(rec.NUMBER_ERRORS),5)||
rpad(to_char(rec.RETURN_RESULT),8)||
rpad(to_char(rec.EXECUTION_AUDIT_STATUS),10)||
rpad(to_char(rec.MESSAGE_SEVERITY),10)||
rpad(to_char(rec.MESSAGE_TEXT),200)||crlf;
end loop;
utl_smtp.helo(mail_conn, mailhost);
utl_smtp.mail(mail_conn, pSender);
utl_smtp.rcpt(mail_conn, pRecipient);
utl_smtp.data(mail_conn, mesg);
utl_smtp.quit(mail_conn);
return retval;
EXCEPTION
WHEN OTHERS THEN
return 1;
END;
Regards,
Kumar

Execute procedure over database link

Hi,
I''m working on a package where you can select the required database, paste some query and with clicking on a button it will execute and create an explain plan for this query.
Therefore i've create a procedure on each database that put's the explain plan in the PLAN_TABLE.
To do this i need to execute this prodecure from the package. I use the following code:
DBA_OWNER.DB_PCD_EXPLAIN_PLAN@DBA_LINK_533.WORLD(p_query);
This is working fine as this database link allready exists to the required database. But i want to make the database link name variable. I've allready created the dynamic database link:
l_link varchar2(20) := 'DBA_LINK';
l_link_nr number(4) := dbms_random.value(0,1000);
l_db varchar2(20) := l_link||'_'||l_link_nr;
l_statement varchar2(4000);
begin
l_statement := 'create database link '||l_db||' connect to **** identified by ***** using '''||p_database||'.WORLD''';
execute immediate l_statement ;
So now i have the dynamic databaselink that is created each time i call the package.
now i want to use this databaselink to call the procedure. this is where it goes wrong.
The code i'm using:
DBA_OWNER.DB_PCD_EXPLAIN_PLAN@l_db(p_query);
is not acceoted when i build the package.
The follwoing error message is showed.
PACKAGE BODY DBA_OWNER.PCK_EXPLAIN_PLAN
On line: 66
PLS-00352: Unable to access another database 'L_DB'
Does someone know how to use this variable to execute the procedure on the remote db?

Any procedures you call have to be accessible at compile time, so the database link must also exist at compile time.
You can get around this by putting your procedure call to DB_PCD_EXPLAIN_PLAN inside dynamic SQL, the same as you are doing to create the database link. Dynamic SQL is not checked until runtime.
Think about the risk if this procedure is exploited. You are creating a way for someone to run arbitrary code in an any database in your environment, with presumably a highly-privileged ID, if it can run an explain plan against any schema in any target database.
This is exposing some significant security issues. Read up on SQL injection, and have someone else review the code for security issues before deploying this.

Slow Query over Database Link with Bind Variable

I have a query over a DB link, with all tables on the remote database.
If I use a bind variable (from Toad), the query takes 4 minutes. If I replace the bind variable with a constant or substitution variable, it takes 1 second.
The query runs fine when run directly on the remote database using bind variable.
9.2.0.7

Look up "Bind variable peeking"
What's happened is you have an execution plan that differs from the one with the constant. Why? My bet is that Oracle "peeked" at the bind variable to help it decide which execution plan to build. It then cached it. It probably cached an execution with an index when it should be doing a full table scan or a hash join instead of a nested loop. It's hard to say specifically what it is.
Try this, flush your shared pool and rerun the query with the bind and let us know if it takes 1 second or 4 minutes. If it takes 1 second, then that was probably it.
Read part 2 of Tom Kyte's blog post on what it is and it's behavior.
http://tkyte.blogspot.com/2007/09/sqltracetrue-part-two.html

Interactive report performance problem over database link

Hi gurus,
I have an interactive report that retrieves values from two joined tables both placed on the same remote database. It takes 45 seconds to populate (refresh) a page after issuing a search. If I catch the actual select that is generated by apex ( the one with count(*) over ()...) and run it from sql environment, it takes 1 or 2 seconds. What on earth does consume the rest of the time and how to speed this up? I would like to awoid creating and maintaining local materialized views if possible.
Regards
Samo

Hi
APEX normally needs to return the full result set for the purposes of pagination (where you have it set to something along the lines of show x-y of z), changing this or the max row count can affect performance greatly.
The driving site hint would need to refer to the name of the view, but can be a bit temperamental with this kind of thing. The materialize hint only works for sub-factored queries (in a 'WITH blah AS(SELECT /*+ MATERIALIZE */ * FROM etc. etc.)). They tend to materialize anyway and its best not to use hints like that for production code unless there is absolutely no other option, but just sub factoring without hints can often have a profound effect on performance. For instance
WITH a AS
SELECT c1,
        c2,
        c3,
        c4,
        c5
FROM schema1.view1)
, b AS
SELECT c1,
        c2,
        c3
FROM schema1.view2)
SELECT *
FROM a, b
WHERE a.c5 = b.c3May produce a different plan or even just sub factoring one of the external tables may have an effect.
You need to try things out here and experiment and keep looking at the execution plans. You should also change Toads row fetch setting to be all 9's to get a real idea of performance.
Let me know how you get on.
Cheers
Ben
http://www.munkyben.wordpress.com
Don't forget to mark replies helpful or correct ;)
Edited by: Munky on Sep 29, 2009 1:41 PM

Find database name of sessions over database link

Hi,
I have a database in which i can see a few sessions which are connected to this database from one of my server which is hosting 2 databases. Now if i query v$session on my local database, i can only find the host name in program and module column of v$session view. How can i find out that from which database these sessions are established because i have two databases on that remote host from where these sessions are estableshed.
Thanks
Salman

only way is if i have set the client info.alternatively application info.
I've never tried the following, but perhaps using different LISTENER or port could be used as a differentiator.
Keep in mind that what the local DB server "knows" is it serviced some connection request from remote client.
Local DB server knows little to nothing about any remote DB masquerading as a client connection.
This is an application issue not Oracle RDBMS issue.

Select query over database link hanging

Hi All,
I have been looking all over the internet and all over this forum but i could not find the solution for my issue given below.
There are a number of distributed databases (Oracle 10g) over a private network. Sending and receiving data amongst all the databases work fine. But when one particular database A tries to receive data from database B, it hangs and then the famous old error TNS LOST CONTACT.
Basically, this has been implemented by creating a batchjob. This worked fine for years and now suddenly this is not working only for the two specific databases.
It is just a simple select query being hit on the remote database. This is called through a function in the package, which builds the dynamic select query using DBMS_SQL package.
It actually hangs when doing DBMS_SQL.PARSE ();
The same function when called in a pl/sql block from database A, works perfectly fine and receives the required data from database B. This was tried with Oracle SQLDeveloper, TOAD and SQLPLUS.
Things seems to be working fine, but actually unaware of the problem. I tried all the suggestions provided over the metalink also.
Require your help urgently.
Thanks
Akhil.

Hi Rajat,
The user uses DEFAULT profile. The details of the parameter are:
PROFILE RESOURCE_NAME RESOURCE_TYPE LIMIT
DEFAULT COMPOSITE_LIMIT KERNEL UNLIMITED
DEFAULT SESSIONS_PER_USER KERNEL UNLIMITED
DEFAULT CPU_PER_SESSION KERNEL UNLIMITED
DEFAULT CPU_PER_CALL KERNEL UNLIMITED
DEFAULT LOGICAL_READS_PER_SESSION KERNEL UNLIMITED
DEFAULT LOGICAL_READS_PER_CALL KERNEL UNLIMITED
DEFAULT IDLE_TIME KERNEL UNLIMITED
DEFAULT CONNECT_TIME KERNEL UNLIMITED
DEFAULT PRIVATE_SGA KERNEL UNLIMITED
DEFAULT FAILED_LOGIN_ATTEMPTS PASSWORD 10
DEFAULT PASSWORD_LIFE_TIME PASSWORD UNLIMITED
DEFAULT PASSWORD_REUSE_TIME PASSWORD UNLIMITED
DEFAULT PASSWORD_REUSE_MAX PASSWORD UNLIMITED
DEFAULT PASSWORD_VERIFY_FUNCTION PASSWORD NULL
DEFAULT PASSWORD_LOCK_TIME PASSWORD UNLIMITED
DEFAULT PASSWORD_GRACE_TIME PASSWORD UNLIMITED
Thanks
Akhil

FORALL MERGE statement works in local database but not over database link

Given "list", a collection of NUMBER's, the following FORALL ... MERGE statement should copy the appropriate data if the record specified by the list exists on both databases.
forall i in 1..list.count
merge into tbl@remote t
using (select * from tbl
where id = list(i)) s
on (s.id = t.id)
when matched then
update set
t.status = s.status
when not matched then
insert (id, status)
values (s.id, s.status);
But this does not work. No exceptions, but target table's record is unchanged and "sql%rowcount" is 0.
If the target table is in the local database, the exact same statement works:
forall i in 1..list.count
merge into tbl2 t
using (select * from tbl
where id = list(i)) s
on (s.id = t.id)
when matched then
update set
t.status = s.status
when not matched then
insert (id, status)
values (s.id, s.status);
Does anyone have a clue why this may be a problem?
Both databases are on Oracle 10g.
Edited by: user652538 on 2009. 6. 12 오전 11:29
Edited by: user652538 on 2009. 6. 12 오전 11:31
Edited by: user652538 on 2009. 6. 12 오전 11:45

Should throw an error in my opinion. The underlying reason for not working is basically because of
SQL> merge into   t@remote t1
     using   (    select   sys.odcinumberlist (1) from dual) t2
        on   (1 = 1)
when matched
then
   update set i = 1
Error at line 4
ORA-22804: remote operations not permitted on object tables or user-defined type columnsSame reason as e.g.
insert into t@remote select * from table(sys.odcinumberlist(1,2,3))doesn't work.

Execute procedure over db link

I am trying to execute a stored procedure over database link and I get the following error
DBMS_APPLY_ADM.SET_UPDATE_CONFLICT_HANDLER@DBCS(
ERROR at line 12:
ORA-06550: line 12, column 2:
PLS-00306: wrong number or types of arguments in call to 'SET_UPDATE_CONFLICT_HA
NDLER'
ORA-06550: line 12, column 2:
PL/SQL: Statement ignored
However when I execute the same peice of code by logging on to the server the code executes successfully. "DBCS" is the database link name.
CODE which I am executing over DB LINK
DECLARE
COL_NAME DBMS_UTILITY.NAME_ARRAY;
CURSOR C1 IS
SELECT COLUMN_NAME FROM ALL_TAB_COLUMNS WHERE OWNER='SCOTT' AND TABLE_NAME='DEPT';
BEGIN
OPEN C1;
FETCH C1 BULK COLLECT INTO COL_NAME;
CLOSE c1;
DBMS_APPLY_ADM.SET_UPDATE_CONFLICT_HANDLER@DBCS(
OBJECT_NAME => 'SCOTT.DEPT',
METHOD_NAME => 'OVERWRITE',
RESOLUTION_COLUMN => COL_NAME(1),
COLUMN_LIST => COL_NAME);
END;
CODE without DB LINK (executed this on db where db link is pointing too.
DECLARE
COL_NAME DBMS_UTILITY.NAME_ARRAY;
CURSOR C1 IS
SELECT COLUMN_NAME FROM ALL_TAB_COLUMNS WHERE OWNER='SCOTT' AND TABLE_NAME='DEPT';
BEGIN
OPEN C1;
FETCH C1 BULK COLLECT INTO COL_NAME;
CLOSE c1;
DBMS_APPLY_ADM.SET_UPDATE_CONFLICT_HANDLER(
OBJECT_NAME => 'SCOTT.DEPT',
METHOD_NAME => 'OVERWRITE',
RESOLUTION_COLUMN => COL_NAME(1),
COLUMN_LIST => COL_NAME);
END;
Please guide.

orausern wrote:
Hi,
We are on Oracle 11.2.0.2 on Solaris 10. I have two databases on this version of Oracle. From one db I have execute a stored procedure via db link to another database. The store procedure has dynamic sqls (execute immediate) and it uses commit statement as part of the code. Is it alllowed to execute this procedure over db link? I am not aware on the implications on stored proc execution over db link and will be thankful for help.
Thanks,if no error is thrown, why are you looking for problems where none exist?

Database link in forms 6i stopped working in database 10g release 2.

Hi,
We have Forms 6i with all patches added.
We were able to recompile the form that contains database link in database 10g release 1 environment. Recently we migrated to database 10g release 2.
We still can run the form (previously compiled in database 10g release 1), but when we tried to modify the form and recompile it in databbase 10g release 2,
the forms developer closed down without giving any error message.
When we removed any reference to the database link from the form, we were able to recompile the form with no problem. Database Linkd in SQL works.
The question: what do we need to do in the database 10g release 2 to make the link in forms 6i work?
Thank you. Lev.

I recently upgraded my development environment from Forms 10.1.2.0.2 to Forms 10.1.2.3 and am experiencing the same problem -- not able to COMPILE a form that references a database link. The error is: "Error 352 at line 99, column 3 Unable to access another database 'LINKNAME'". This occurs on an UPDATE statement within PL/SQL code in a form trigger that used to compile and work fine.
I tried the database link in SQL Plus and the link is working fine.
Database environment is 10g 10.2.0.3 on Windows Server 2003.
Is anyone able to do this?

Database link in forms is different that actual database name

I am using a database link in Oracle Forms 6i, however, the database link name for the referenced database is not the same as the actual databse service/instance name.
It does not work, and I suppose its something to do with the global names feature which is true in the source database it is in a replication group.
I would like to know whether the dblink name which I am using in oracle forms, does it have to have the same name as an entry in the tnsnames.ora file, or can be substituted thgrough any so-calld alias from within oracle forms?
Windows 2k Ad svr, Oracle Forms 6i, DB 9.2.0.1

I recently upgraded my development environment from Forms 10.1.2.0.2 to Forms 10.1.2.3 and am experiencing the same problem -- not able to COMPILE a form that references a database link. The error is: "Error 352 at line 99, column 3 Unable to access another database 'LINKNAME'". This occurs on an UPDATE statement within PL/SQL code in a form trigger that used to compile and work fine.
I tried the database link in SQL Plus and the link is working fine.
Database environment is 10g 10.2.0.3 on Windows Server 2003.
Is anyone able to do this?

Error in database link(ORA-02063 and ORA-02391)

Hi
database link was working fine till this morning. now when i try to query using the database link, i get the following error
ORA-02391: exceeded simultaneous SESSIONS_PER_USER limit
ORA-02063: preceding line from RMSLIVE
It would beof great help if you can advise why this error is occuring.
many thanks.

The error stack is quite obvious.
Either, the profile, with which the database user on remote database is running, must be modified to allow more connections or investigate the session leak in the application talking over database links.

Column reference over database link.

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