Creating trigger using database link

I need to create the trigger from local server B using Dblink(whereas the dblink points to the remote server A)
Action of the trigger:
After every insertion of the record in the 'Table1' from the Remote DB Server A , the newly inserted record should parallely inserted into the 'Table 2' of the local server B
Kindly help me out to do
_ BY
Rajan

I tried to create the trigger but it throws like DDL operations are not allowed in the remote database.
Following is the script, I have tried
CREATE OR REPLACE TRIGGER ROUTE_TRIGGER AFTER INSERT ON ROUTEDECISION@DBLINK1
FOR EACH ROW
DECLARE
BEGIN
INSERT INTO routedecision_rptdb(a1,a2) values(:new.a1,:new2.a2);
END;

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Creating user using database link

Hi
I have 11g installed on one of the server
I have created the database link BUGAU to bugau.us.oracle.com
link works fine
select * from table@"Bugau" gives the expected result
I need run the below statement from my server using the dblink.but not sure how to use the dblink for this purpose.Please assit
CREATE USER ABC IDENTIFIED BY welcome DEFAULT TABLESPACE USERS_001 TEMPORARY TABLESPACE temp123;
GRANT DEFAULT TO abc;
ALTER USER abc PROFILE LEVEL_1;
Thanks
Archana

as mentioned in oracle documentation for db link purpose: you can use it for accessing schema objects in remote database..
http://download.oracle.com/docs/cd/B28359_01/server.111/b28286/statements_5005.htm
>
Use the CREATE DATABASE LINK statement to create a database link. A database link is a schema object in one database that enables you to access objects on another database. The other database need not be an Oracle Database system. However, to access non-Oracle systems you must use Oracle Heterogeneous Services.
After you have created a database link, you can use it in SQL statements to refer to tables and views on the other database by appending @dblink to the table or view name. You can query a table or view on the other database with the SELECT statement. You can also access remote tables and views using any INSERT, UPDATE, DELETE, or LOCK TABLE statement.
>
For creating users, you have to login to the remote database itself, You also need to login using the user who has the necessary credentials to create the user.
Regards,
Dipali.

How to Execute a Remote Procedure in Portal using Database Link

Hi,
I followed the instructions to create a Portal form for a remote procedure. But I am encountering the following error. Can someone advise what may be the cause?
Failed to execute - Missing string(create_package_body) language(us) domain (wwv) sub_domain (wwv_builder) (WWV-04300)
ORA-04020: deadlock detected while trying to lock object PUBLIC.PORTLET_SCHEMA (WWV-11230)
Failed to parse as PORTAL - (WWV-08300)
PURPOSE
How to execute a remote procedure in Portal using Database Link.
DESCRIPTION
This procedure assumes that you have two databases, one of which is remote, and Portal is configured in the other.
Remote Database A:
==================
1) Create a procedure as follows: Create or Replace PROCEDURE SCOTT.ADD_TWO_VALUES ( v_one IN NUMBER, v_two IN NUMBER, v_result OUT NUMBER) as begin v_result :=v_one+v_two; end; 2) Grant execute privileges to PUBLIC on the procedure.
Database B (where Portal is configured): ========================================
1) Create a public database link and choose to connect as a specific user (say SYSTEM). By default, in an Oracle 8i database, the "global_names" parameter in initSID.ora (or init.ora) file is set to "true". This Global Naming parameter enforces that a dblink has the same name as the database it connects to. Therefore, if the remote global database (A) name is "ora8.acme.com" then the database link should also be named as "ora8.acme.com".
2) Create a synonym for the procedure in Database A. Make sure you fully qualify the procedure name in the remote database (like SCOTT.ADD_TWO_VALUES).
3) Create a dynamic page to execute the procedure. The ORACLE tags in the dynamic page will look similar to the following: <ORACLE> DECLARE v_total NUMBER; BEGIN ADD_TWO_VALUES(:v_one,:v_two, v_total); htp.p('The total is => '); htp.p('<input type="TEXT" VALUE='||v_total||'>'); htp.para; htp.anchor('http://<machine.domain:port#>/pls/portal30/SCOTT.DYN_ADD_TWO_VALUES.show_parms', 'Re-Execute Procedure'); END; </ORACLE>
4) Portal does not have an option to create a form based on a synonym. Therefore, if you want to create a form instead of a dynamic page, create a wrapper procedure and then create a form based on this procedure. For example: Create or Replace PROCEDURE PORTAL30.ADD_TWO_VALUES_PR ( v_one IN NUMBER, v_two IN NUMBER, v_total OUT NUMBER) as begin add_two_values(v_one, v_two, v_total); end;
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hello...
any input will welcomed... Thanks..

Adding user to the oracle database using database link - is it possible?

Hi, i wolud like to manage my databases using one client. I easilly operate on my distriubuted tables but i have problem with creating users in distribiuted database. Is it possible to create users in distributed database using database links? or it have to be done locally using some stored procedures or sth similar?

The SQL syntax of the CREATE USER statement doesn't support DB links, the only way to do it would be with stored procedures. There might be an Oracle SP for that or for generic remote execution of SQL, but I'm not familiar with such.

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Hi,
i just configured and created a PUBLIC database link on my 10g oracle. I can use it successfully from sqlplus doing some simple select like:
SQL> select * from "table"@dblink
The query returns all the result as expected.
Now I would like to use this public link in my applications but the problem is that the link seems to be only available in the SYS schema.
Ho can I access from other schema?
In other words, in need to do some select (and insert) from my APEX applications using the db link. If I try the said select, all I obtain is
ORA-02019: connection description for remote database not found

Is that the actual command or what you believe you issued? Can you pull the entry from dba_db_links to verify the problem is not something as simple as you left off the word 'public' in the command?
In the old days when you used HS you also had to create an hs_tnsnames.ora, hs_listener, and an hs_initsql.ora file. Do you still create these with DG4ODBC? What about the file permissions, are there any requirements to set these in order to allow use?
I found an internet article you can check you actions against and two threads here on OTN that may be of help.
http://www.pythian.com/news/1554/how-to-access-mysql-from-oracle-with-odbc-and-sql/
How to connect to Oracle from MySQL
Oracle to connect MySQL
HTH -- Mark D Powell --

How to use database link in from6i?

I can use database link in sql plus,but i can't use it in forms6i,why? thanks

Don't know why.
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Regards,
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TNS-12666 error occures when using database link

When I am trying to use database link
defined in my database the following error occures:
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In documentation is stated to resolve such an error to
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I have in tnsnames.ora defined network service name
by which I can connect to such a database by SQL*Plus
without any problems, why can I not do such a thing
via database link?
Thanks a lot for advise, ...

Could you change the following entry in your 'sqlnet.ora' file and try?
SQLNET.AUTHENTICATION_SERVICES = (NONE)

Error while creating materialized view which using database link

Helo!
I'm getting error "ORA-00942: table or view does not exist" when I want to create materialized view.
Details:
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CREATE DATABASE LINK SDATABASE
CONNECT TO MYUSER
IDENTIFIED BY MYUSERPASS
USING 'ORCL';
=> Command "SELECT * FROM TABLE1@SDATABASE" returns data normally!
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CREATE MATERIALIZED VIEW LOG
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REFRESH FAST
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NEXT SYSDATE + 1/1440
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How is that possible if command "SELECT * FROM TABLE1@SDATABASE" returns data normally?
Thanks,
Voranc

And, I'm using Oracle 10g.
Voranc

How to use database link to create table in other database?

e.g., java jdbc is connected to the database A.
i want to create one table (Table1)in database B, and then insert data into Table1 select ....from Table2 which is in database A.
i used the create database link (database name) connect to (database) indentified by .....
but ...i got the sqlException as i wrote before.
Thanks again.

http://forum.java.sun.com/thread.jspa?threadID=656868&messageID=3860293#3860293

How to create & use database links

i have 2 databases (oracle 8.1.6) and (oracle8.1.5)
i want to call a function of one d/b from another
i think this is possible via databse links.
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can someone guide me to a site or post an example .
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Using database link in my triggers,urgent

There's DB A on ServerA,DB B on ServerB.Table TA in ServerA's DB and TB on ServerB's DB.My purpose is to synchronize usera.TA with userb.TB real time.
In order to realize it,I created dblink AtoB from A to B using command "create database link AtoB.domain connect to userb identified by userb using 'BTNSname';",it's no problem for I have test on it :select count(*) from [email protected];It's ok to get the result.
But when I create trigger on table TA by using the dblink AtoB.domain to update,delete and insert datas to TB,the error "PLS-00201: identifier '[email protected]' must be declared" occurs while compiling.
The oracle version on the two servers is 8.1.7.
It happens on the production envrionment,but in our lab,there's no problem.The difference between them is that it is cluster structure in production one.
I tried several times,but failed,just wondered if some privilege was not right?But I can do selection from this dblink,only in trigger there's compilation errors.
Really hope that someone could give light on it.
Thank you in advance!
In addition,I did some modification in my triggers to have a try.
I created a synonym for the remote table,and the trigger then updates the synonym instead of the remote table [email protected] .But also failed.
The same error,saying the synonym is not declared.
Any good way to realize the same thing?

Thank you for your answering first.
I don't use replication because the destination table's structure is not exactly the same as the source one.
--The selection was done in the production,connection to the source schema,then select through the dblink from the source to the dest schema,the trigger is created in source schema on source table to handle datas in destination schema's table.In lab,all is ok,no such a problem.
--I created two dblinks,one is connect to source as system user,created a public dblink "create public database link AtoB.domain using 'BTNSname';";the other is connect as UserA,"create database link AtoB.domain connect to UserB identified by UserB using 'BTNSname';".

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The only down side I have been able to identify is that a extra session is created and that the CPU has a little extra work due to the LOOP BACK that takes place. I need to ensure the network is not unnessesarly used and therefore will need to ensure that 127.0.0.1 (local host) is used in the database connection discription. e.g.
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Logical error in creating tables using db link in solaris

Hi,
While creating table using the syntax create table newtab...as select * from tab@dblink .. I am facing a problem. The newtab table created is having a structure different (from datalength point of view of varchar2 and char datatypes) from the source. The data length is getting tripled i.e. if a column a is varchar2(20) in tab then it is becoming --- a varchar2(60) in newtab. This is happening in solaris environment when the two databases are in 2 different servers. Please let me know if there are any patches to resolve the problem.
Thanks
Arnab

ORA-02019: connection description for remote database not foundHave you used this database link successfully for some other queries?
The error posted seems to indicate that the DB Link is not functional at all. Has it worked for any other type of DML operation or is this the first time you ever tried to use the link?

20 Index Restriction on Remote Tables (i.e. using Database Links)

The Oracle Database Administrator's Guides for 10g and 11g document a performance restriction that "No more than 20 indexes are considered for a remote table." If I go back to the 8i documentation it says "In cost-based optimization, no more than 20 indexes per remote table are considered when generating query plans. The order of the indexes varies; if the 20-index limitation is exceeded, random variation in query plans may result."
Does anyone have more details on this performance restriction? In particular I am trying to answer these questions:
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2) Can I influence which indexes are considered with index hints or will my hints only be considered if they are for one of the "random" 20 indexes which are being considered by the CBO?
3) Are there any other approaches or work-arounds to this restriction assuming you need to select from a large remote table with more than 20 indexes (and need to perform the selection using 1 of those indexes to get adequate performance) or do we need to abandon database links for this table?
Thanks in advance for your input.

So, here's my simple test.
SQL>
SQL> create table gurnish.indexes20plus ( n1 number, n2 number, n3 number, n4 number, n5 number, n6 number, n7 number,
2 n8 number, n9 number, n10 number, n11 number, n12 number, n13 number, n14 number, n15 number, n16 number,
3 n17 number, n18 number, n19 number, n20 number, n21 number, n22 number, n23 number, n24 number,
4 n25 number, n26 number, n28 number);
create index xin1 on indexes20plus (n1);
Table created.
SQL> SQL> create index xin2 on indexes20plus (n2);
create index xin3 on indexes20plus (n3);
Index created.
SQL> SQL>
Index created.
SQL> SQL> create index xin4 on indexes20plus (n4);
Index created.
SQL> SQL>
Index created.
SQL> SQL> create index xin5 on indexes20plus (n5);
create index xin6 on indexes20plus (n6);
Index created.
SQL> SQL>
Index created.
SQL> SQL> create index xin7 on indexes20plus (n7);
Index created.
SQL> SQL> create index xin8 on indexes20plus (n8);
Index created.
SQL> SQL> create index xin9 on indexes20plus (n9);
Index created.
SQL>
SQL> create index xin10 on indexes20plus (n10);
Index created.
SQL> SQL> create index xin11 on indexes20plus (n11);
create index xin12 on indexes20plus (n12);
create index xin13 on indexes20plus (n13);
Index created.
SQL> SQL>
Index created.
SQL> SQL>
Index created.
SQL> SQL> create index xin14 on indexes20plus (n14);
Index created.
SQL> SQL> create index xin15 on indexes20plus (n15);
Index created.
SQL>
SQL> create index xin16 on indexes20plus (n16);
Index created.
SQL>
SQL> create index xin17 on indexes20plus (n17);
Index created.
SQL> SQL> create index xin18 on indexes20plus (n18);
Index created.
SQL> SQL> create index xin19 on indexes20plus (n19);
Index created.
SQL> SQL> create index xin20 on indexes20plus (n20);
Index created.
SQL> SQL> create index xin21 on indexes20plus (n21);
Index created.
declare
i number;
begin
for i in 1..100
loop
dbms_random.seed(i+100);
insert into indexes20plus values (dbms_random.value(1,5),dbms_random.value(1,21),dbms_random.RANDOM, dbms_random.RANDOM,dbms_random.value(1,20),
dbms_random.value(1,4),dbms_random.value(1,6), dbms_random.value(1,7),dbms_random.value(1,9),dbms_random.value(1,10),
dbms_random.value(1,11),dbms_random.value(1,12),dbms_random.value(1,13),dbms_random.value(1,14),dbms_random.value(1,1),
dbms_random.value(1,1),dbms_random.value(1,19),dbms_random.value(1,122),dbms_random.value(1,20),dbms_random.value(1,20)
,dbms_random.value(4,20),dbms_random.value(1,20),dbms_random.value(1,20),dbms_random.value(1,20),dbms_random.value(1,20)
,dbms_random.value(4,20),dbms_random.value(4,20));
end loop;
commit;
end;
SQL> set autotrace traceonly
SQL> l
1* select * from gurnish.indexes20plus@lvoprds where n1 = 4
SQL> /
no rows selected
Execution Plan
Plan hash value: 441368878
| Id | Operation | Name | Rows | Bytes | Cost (%CPU
)| Time | Inst |
| 0 | SELECT STATEMENT REMOTE | | 1 | 351 | 1 (0
)| 00:00:01 | |
| 1 | TABLE ACCESS BY INDEX ROWID| INDEXES20PLUS | 1 | 351 | 1 (0
)| 00:00:01 | LVPRD |
|* 2 | INDEX RANGE SCAN | XIN1 | 1 | | 1 (0
)| 00:00:01 | LVPRD |
Predicate Information (identified by operation id):
2 - access("A1"."N1"=4)
Note
- fully remote statement
- dynamic sampling used for this statement
Statistics
0 recursive calls
0 db block gets
0 consistent gets
0 physical reads
0 redo size
1897 bytes sent via SQL*Net to client
481 bytes received via SQL*Net from client
1 SQL*Net roundtrips to/from client
0 sorts (memory)
0 sorts (disk)
0 rows processed
SQL> select * from gurnish.indexes20plus@lvoprds where n21 = 4;
no rows selected
Execution Plan
Plan hash value: 2929530649
| Id | Operation | Name | Rows | Bytes | Cost (%CPU
)| Time | Inst |
| 0 | SELECT STATEMENT REMOTE | | 1 | 351 | 1 (0
)| 00:00:01 | |
| 1 | TABLE ACCESS BY INDEX ROWID| INDEXES20PLUS | 1 | 351 | 1 (0
)| 00:00:01 | LVPRD |
|* 2 | INDEX RANGE SCAN | XIN21 | 1 | | 1 (0
)| 00:00:01 | LVPRD |
Predicate Information (identified by operation id):
2 - access("A1"."N21"=4)
Note
- fully remote statement
- dynamic sampling used for this statement
Statistics
1 recursive calls
0 db block gets
0 consistent gets
0 physical reads
0 redo size
1897 bytes sent via SQL*Net to client
481 bytes received via SQL*Net from client
1 SQL*Net roundtrips to/from client
0 sorts (memory)
0 sorts (disk)
0 rows processed
SQL>

How to fetch,update,insert the data using database link on diff. servers

I am using two oracle server.
1st) Oracle 9i ( Server1 )
2nd) Oracle 10g ( Server2 )
3) Forms 6i
I have created a database link on Server 1 for connecting to Server 2.
I written a piece of code which will be executed in Forms 6i and is connected to Server1.
The piece of code brings the data from SErver2 via cursor and I try to insert / update the relevant records
in my Server1 database users.
The Insert/Update runs sucessfully but at the time of commit I get the following errors
in Forms ORA-01041:internal error. hostdef does not exist.
Then it forcefully rollback the data and come out of the application.
contact :email-id : [email protected]

Suggest you test your code from sqlplus before running from forms.
Start by testing a simple "select sysdate from dual@<database link>;" then test select from application_table@<database link> then test the insert/update code. After it works from sqlplus, then try it from forms.

Creating trigger using database link

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