Double database links

Hi All,
Consider the following: On database A ther's a public databaselink to database B. On database B ther's a public databaselink to database C.
Question: Is it possible to access data on database C from database A without the use of synonyms on database B (which point to database C, that works fine) ?
Maybe something like this: select count(*) from emp@dbl_ab@dbl_bc
Any suggestions?
Michiel

The example I stated doesn't work, it was more a hint to explain the problem more.
I guess it isn't possible.

Similar Messages

How to escape double quotes in database link login

CREATE DATABASE LINK AA
CONNECT TO NAME
IDENTIFIED BY PASS"WORD
USING "DOMAIN"
given error of missing double quote identifier. already tried PASS\"WORD, 'PASS"WORD', \PASS"\WORD, \"PASS\"WORD, PASS+CHAR(34)+WORD. no luck.
I am not in position to change the database password. It can be successfully connected without database link.
Thanks for any comment.

How about:
begin
execute immediate 'CREATE DATABASE LINK AA CONNECT TO NAME IDENTIFIED BY PASS"WORD USING "DOMAIN"';
end;

Create a database link to access SqlServer 2005 view from oracle 11gr2

Hi All,
Greetings for the day.
Though I have seen quite a few posts but just wanted to cross-verfiy and double check hence posting.
Oracle Database : 11gr2
OS :SOLARIS SPARC 64 Bit
SQL Server Database : Sql Server 2005
OS : Windows 2003 32 Bit
The requirement is to access a view residing in the SQL Server 2005 Database using the Oracle Database. This involves creation of a Database link in the Oracle Database to access the SQL Server.
Can you suggest which approach should i follow ( I am able to understand that both do the same job ):
How to Configure DG4MSQL (Oracle Database Gateway for MS SQL Server) 64bit Unix OS (Linux, Solaris, AIX,HP-UX) post install [ID 562509.1]or
How to Configure DG4ODBC on 64bit Unix OS (Linux, Solaris, AIX, HP-UX Itanium) to Connect to Non-Oracle Databases Post Install [ID 561033.1]Will they do the same job ? And can they be used on any OS and version of the SQL Server Database as version information for SQL Server is not specified anywhere?
Please let me know so that I can it forward with Business for approvals and budgetting.
Regards
KK

Your question is similar to the post: Oracle 11gr2 connection to Sql Server using dg4msql problem
Please visit: http://stackoverflow.com/questions/4658942/oracle-11gr2-connection-to-sql-server-using-dg4msql-problem
Answer on the website:
You seem to be using the Gateway for MySQL set-up rather than the Heterogeneous Gateway (for ODBC connections). Here is an overview of the process
On SQL Server create a database user and give it read access to the database/tables you want to read via the Oracle database link.
In the gateway home each SQL Server database you want to access should have an init.ora located in $OH/dg4msql/admin in the form initsid.ora where sid is the name of the database to be used in the link (e.g. initbob.ora), so create one
HS_FDS_CONNECT_INFO=msserver1:1234//Example_Database
HS_FDS_TRACE_LEVEL=OFF
HS_FDS_RECOVERY_ACCOUNT=RECOVER
HS_FDS_RECOVERY_PWD=RECOVER
HS_TRANSACTION_MODEL=READ_ONLY
You must now add the new sid to the listener.ora in the gateway home using an additional SID_DESC section inside the existing SID_LIST, for example
(SID_DESC =
(SID_NAME=bob)
(ORACLE_HOME=/oracle/gateway/product/11.2.0)
(ENVS=LD_LIBRARY_PATH=/oracle/gateway/product/11.2.0/dg4msql/driver/lib;/oracle/gateway/product/11.2.0/lib)
(PROGRAM=dg4msql)
You should now stop and restart the gateway listener so that the new sid becomes active. NB a reload is not enough.
You must now add the new sid in the tnsnames.ora file for the listener of each database in which you will create a link. You don't need to do this in the gateway home unless it is also a database home in which you will create a database link.
bob =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = severname.example.com)(PORT = 1690))
(CONNECT_DATA = (SID = bob))
(HS = OK)
NB: The host and port are for the gateway not for the SQL Server database
In each database that requires a link to the MS-SQL database you should create a database link to your new gateway sid.
CREATE PUBLIC DATABASE LINK bob
CONNECT TO "ms_user" IDENTIFIED BY "ms-passwd" USING 'bob';
where ms-user and ms-password are the SQL Server user you created right at the start.
Now you can test the new database link
SELECT COUNT(*) FROM "Table_Name"@bob;
Once you have this working you can alter the initsid.ora file to add parameters to suit your connection. If you do it this way you can easily add and manage many different databases via the gateway.
Hip
Edited by: 1000595 on 04:58 17-04-2013

Database links issue ORA-01017 ORA-02063

Oracle 11g R1 , RHEL 5 64bit
HI all,
I am having this strange issue with my database links. They used to work in the past but now they are not. Here is what I have checked:
- All the TNSnames.ora file entries are there and are correct...I double checked with tnsping
- I changed all the passwords to be the same on all environments (DEV/QA/PROD)
- I have dropped and re-created all the database links
However, I still get the same error when I test them:
ORA-01017: invalid username/password; logon denied ORA-02063: preceding line from <database_name>
Here are the links created on DEV:
SQL> select * from dba_db_links;
OWNER DB_LINK USERNAME HOST CREATED
PUBLIC FPRCQA.FPRC.OPHTH.WISC.EDU FPRCQA 01282009
FPRCHR FPRCQA.FPRC.OPHTH.WISC.EDU FPRCHR FPRCQA 01282009
PUBLIC FPRCPROD.FPRC.OPHTH.WISC.EDU FPRCPROD 01282009
FPRCHR FPRCPROD.FPRC.OPHTH.WISC.EDU FPRCHR FPRCPROD 01282009
The above links were created using the following syntax:
SQL> conn sys as sysdba
Enter password:
Connected.
SQL> create public database link FPRCQA.FPRC.OPHTH.WISC.EDU using 'FPRCQA';
Database link created.
SQL> create public database link FPRCPROD.FPRC.OPHTH.WISC.EDU using 'FPRCPROD';
Database link created.
SQL> conn fprchr
Enter password:
Connected.
SQL> CREATE DATABASE LINK FPRCQA.FPRC.OPHTH.WISC.EDU CONNECT TO FPRCHR IDENTIFIED by <passwd> using 'FPRCQA';
Database link created.
SQL> CREATE DATABASE LINK FPRCPROD.FPRC.OPHTH.WISC.EDU CONNECT TO FPRCHR IDENTIFIED by <passwd> using 'FPRCPROD';
Database link created.
Now when I do a simple query, I get the error:
SQL> select count(*) from fprchr.department@FPRCQA;
select count(*) from fprchr.department@FPRCQA
ERROR at line 1:
ORA-01017: invalid username/password; logon denied
ORA-02063: preceding line from FPRCQA
I have read some notes on metalink, but they were talking about situations where you have a 10g database connecting to an 11g database and the whole password case-sensitivity issue, but this is not the case here as all the databases are 11g.
I would appreciate any and all help on this issue.
Thank you much.

The documentation has the answer:
user IDENTIFIED BY passwordSpecify the username and password used to connect to the remote database using a fixed user database link. If you omit this clause, the database link uses the username and password of each user who is connected to the database. This is called a connected user database link.>
Since you haven't specified user/password in your public database links, then Oracle will try to create a connection on the remote db with the same user/password who is trying to use the database link. If the user doesn't exists or has a different password then you get an error (the same you mentioned in you original post)
HTH
Enrique

Forgot how to call a database link in Apex... @linkname not working for me

Don't have access to my old apps and I can't remember how to call fields from a database link now...
when i try
select "TABLE"."DATE" as "Date"
from "TABLE" "TABLE" @LINKNAME
I get ORA-00933: SQL command not properly ended
Tried CHRISD which is the name of the link, then tried CHRISD.REGRESS.RDBMS.DEV.US.ORACLE.COM which is the entire name.
Neither one looks right to me but I can't remember the correct syntax for the link name... I remember putting something about userlink in there somewhere but nothing I can think of works.
anyone?

select ename from emp@dblink
...lose the double quotes.
Scott

Database link troubles - 911

I have encountered a when attempting to create a database link. I get the error TNS:could not resolve service name and I cannot figure out why. I used the following to create the link:
create public database link remote_db
connect to user identified by pwd
using 'alias'
Where:
remote_db it is only a string...the name for your db link
user is the remote owner of table you want to
update
pwd is the password for user on remote database
alias is the name you defined in your file
tnsnames.ora
I even double checked the alias.
Any suggestions?
Tammy

Are you sure the alias is defined in the tnsnames.ora file on the database server where you are creating the link? It doesn't help to define it in the tnsnames.ora file on your client machine.
Justin
Distributed Database Consulting, Inc.
http://www.ddbcinc.com/askDDBC

Can't create database link when password has special character

I'm trying to execute the following statement within sqlplus
create database link alpha connect to scott identified by tiger! using 'db_alpha'
note that the password for the account has an exclamation point in it. the command fails. I've tried placing the password in quotes (') and double-quotes ("). The double-quotes work, but then the link fails to function properly.
We are required to have a special character in our passwords... so how do I get that special character into the password for the database link?
Thanks in advance,
Darren

for some weird reason, I can't post the reply I want. every time I try, the forum hangs and doesn't save the message. give me a sec...
I have put the password within double quotes... so I'm starting to think the problem is something else. I've been reading other posts regarding creating database links and I've obtained limited results. Here's what I've done, and the results I'm getting.
(names changed to protect the innocent)
My oracle database is on SYSA. I'm on SYSB. I set my TWO_TASK=SYSA and just use sqlplus to connect as user1.
I want to run a command on user2's tables. Normally I would just grant read access to user1 on user2's tables and use a command like
nert spaces to get this to save (weird forum bug here, I can't delete the text to the left)
SQL> sel{color:black}{color}ect * fr{color:black}{color}om u{color:black}{color}s{color:black}{color}e{color:black}{color}r{color:black}{color}2{color:black}{color}.{color:black}{color}m{color:black}{color}y{color:black}{color}_{color:black}{color}t{color:black}{color}a{color:black}{color}b{color:black}{color}l{color:black}{color}e{color:black}{color};
However, user2 is for test data and those tables get dropped and recreated often and it is cumbersome to try to remind everyone to recreate the grants. So I can't trust that user1 will have access to user2's tables. So my goal with the database link is to create a private (for user1 only) database link and access the tables that way, that way I bypass the grant issue. This works out better for me because we only change that password every 2 months. I just recreate the database link once every two months, rather than recreate grants multiple times every week. Well, that's the theory anyway.
Back to creating the database link, I thought my issue was the special character in the password because if I remove the exclamation point everyting works (except that the password is invalid). Below is what it looks like when I do this...
Attempt #1:
SQL> create database link BLAH connect to user2 identified by "tiger" using 'BLAH';
Database link created
SQL> sel{color:black}{color}ect * fr{color:black}{color}om my{color:black}{color}_{color:black}{color}table{color:black}{color}@{color:black}{color}BLAH;
sel{color:black}{color}ect * fr{color:black}{color}om my{color:black}{color}_{color:black}{color}ta{color:black}{color}ble{color:black}{color}@{color:black}{color}BLAH
ERROR at line 1:
ORA-01017: invalid username/password; logon denied
ORA-02063: preceding line from BLAH
So that looks like it's just a password issue. If I put in the correct password... the error changes to this...
Attempt #2:
SQL> create database link BLAH connect to user2 identified by "tiger!" using 'BLAH';
Database link created
SQL> sel{color:black}{color}ect {color:black}{color}* fr{color:black}{color}om my{color:black}{color}_{color:black}{color}table{color:black}{color}@BLAH;
sel{color:black}{color}ect * fr{color:black}{color}om my{color:black}{color}_ta{color:black}{color}ble{color:black}{color}@BLAH
ERROR at line 1:
ORA-02085: database link BLAH.AAA.BB.CCC.DDD connects to
DEVDB.AAA.BB.CCC.DDD
To me, that doesn't make sense. If the link isn't working... how did it get the "invalid username/password" in Attempt #1?
Anyway, in perusing other forum posts, one post said to put in the full text from the tnsnames.ora file instead of the alias. So I do a little cut/paste and try this...
Attempt #3:
SQL> create database link BLAH connect to user2 identified by "tiger!" using
2 '(DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP)(HOST = server001.aaa.bb.ccc.ddd)(PORT = 9999)))
3 (CONNECT_DATA = (SERVICE_NAME = devdb)))';
Database link created.
SQL> sel{color:black}{color}ect {color:black}{color}* fro{color:black}{color}m my{color:black}{color}_{color:black}{color}tab{color:black}{color}le{color:black}{color}@BLAH;
sel{color:black}{color}ect {color:black}{color}* fr{color:black}{color}om {color:black}{color}my_{color:black}{color}tab{color:black}{color}le@B{color:black}{color}LAH
ERROR at line 1:
ORA-02085: database link BLAH.AAA.BB.CCC.DDD connects to
DEVDB.AAA.BB.CCC.DDD
Any ideas on what I'm doing wrong?
Darren

Using database-link in view to get around ORA-01031 error

I have been granted select rights on a users table. I am therefore able to select from his table. If however I try create a view against his table I run into the ORA-01031 problem. I have worked around this problem by creating a database-link to myself and then adding that to the view creation and it works. What are the downsides of using the database-link in this way?

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.
create database link my_db_link connect to scott identified by tiger using '(description=(address=(protocol=tcp)(host=127.0.0.1) (Port = 1521) ) (connect_data= (sid=ora10g)))';

ERROR WHILE CREATING A DATABASE LINK USING HETEROGENEOUS SERVICES

I'm creating a database link with the Oracle Dataware Builder, and i get the following error:
Probando...
Fallo.
SQL Exception
Error del repositorio: Excepción SQL.
Nombre de la Clase: CacheMediator.
Nombre del Método: getDDEntryFromDB.
Mensaje de Error del Repositorio: ORA-28500: connection from ORACLE to a non-Oracle system returned this message:
[Generic Connectivity Using ODBC][Informix][Informix ODBC Driver][Informix]Incorrect password or user [email protected] is not known on the database server. (SQL State: 28000; SQL Code: -951)
ORA-02063: preceding 2 lines from PRUEBA_SEH
As you can see i'm using heterogeneus services to connect to a informix database. ALTIADM is a valid user for that database, i don't send my ip address 192.168.0.62, but the error says "[email protected] is not known in the database server". how can i solve it?????

Right places to ask this question are
Heterogeneous Connectivity
Warehouse Builder

ERROR WHILE CREATING A DATABASE LINK TO INFORMIX

I'm creating a database link with the Oracle Dataware Builder, and i get the following error:
Probando...
Fallo.
SQL Exception
Error del repositorio: Excepción SQL.
Nombre de la Clase: CacheMediator.
Nombre del Método: getDDEntryFromDB.
Mensaje de Error del Repositorio: ORA-28500: connection from ORACLE to a non-Oracle system returned this message:
[Generic Connectivity Using ODBC][Informix][Informix ODBC Driver][Informix]Incorrect password or user [email protected] is not known on the database server. (SQL State: 28000; SQL Code: -951)
ORA-02063: preceding 2 lines from PRUEBA_SEH
As you can see i'm using heterogeneus services to connect to a informix database. ALTIADM is a valid user for that database, i don't send my ip address 192.168.0.62, but the error says "[email protected] is not known in the database server". how can i solve it?????

Right places to ask this question are
Heterogeneous Connectivity
Warehouse Builder

Creation of Database link and access the same plus Snapshot creation

i want talk between two oracle server. i decided to go for snapshot creation with periodical refresh. For which i am having two oracle server's with different ip address located inside our office setup.
I have created a database link between two servers.
first server name global
userid scott
password tiger
second server name asil
userid scott
password tiger
both the user have been given dba rights.
in both the server the services and listners are all started. i gave the following command to create database link.
from asil server
create public database link global connect by scott identified by tiger using 'global'
the command was successful and the link was created. Now i tried to access a table of the scott user of the global server.
select * from emp@global;
now it is giving error. I want to know how the link can be created and how it can be accessed. i refered the 8i online documentation and done the things based on that. i expect valuble solution from all possible persons
null

A reason for this problem could be that your database is configured that a database link has to have exactly the same name like the global name of the database instance it should connect to.
Can you please provide the oracle error code / message ? With this information there might be more hints I can give you.

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:
1) Are the 20 indexes which are considered by the CBO still random in 10g?
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>

HELP! FOR LOOP TO SCROLL THROUGH TABLE AND CREATE DATABASE LINK

Hi,
Here's the scenario, not much of a PL programmer, just basic SQL so really need some help people!
I have 2 tables. 1 contains list of DB's and the other contains rules to follow.
I need to create a loop that goes through the table containing the DB's and on each row a DB link is created (Only 1 link allowed!)
Once created, the schema currently logged in with also has an account on the linked DB in order to run scripts- The scripts are stored centrally hence the requirement for the link to the target DB.
There are numerous scripts that need to be executed and can all be called from 1 script, once executed the loop exists and the database link needs to be dropped.
Once dropped, the first loop continues, creating a DB link for the next DB listed in the table (and all the scripts are fired again)
This continues against all the DB's listed in the table.

Hi BlueShadow,
Thanks again for the response, you've hit the nail on the head. SQL scripts on a unix server, a loop goes through a table 1 at a time. Each row gets a link created and then all the scripts stored on the server are executed against the db linked to. So I'm assuming this is a loop within a loop.
1 loop to go through the table to create the link and then another loop within once connected to execute all the scripts against the connected DB. Once the scripts are run, the loop exits and moves onto the next server and so on until all the servers have the scripts are run.
It's PL/SQL scripts we're after and not shell scripts as this would free us from the OS constraints.
We have to drop the links due to security. Any idea on o

Database link error when compiling forms 6.0 and forms 6i.

Dear sirs,
We have a database link between two databases of the same version oracle 8.0.5.
Recently we have upgraded one of our databases to version 9.2.0.1 (the database where the database link was originally created ) and now we are having problems when compiling forms that have PL/SQL blocks using the database link.
The error message received when compiling the form is the following:
ORA-02068: Following severe error from dbproduc.world
ORA-00600: Internal error code, arguments: [No conversion op],[],[],[],[],[],[],[]
The forms did not present this error before, it began when we made the upgrade.
Is this a FORMS 6.0 problem ?
Is this an ORACLE 8.0.5 problem ?
Is this an ORACLE 9.2.0.1 problem ?
Can you please give me some advice to solve this problem ?
Thanks in advance

As I see, when you use a non-oracle database the tables don`t appear, you must create the realation with the table manually, on the properties

Custom report listing database links

I'm trying to determine what tables/views in the EM12c repository contain database link information (if any), so I can create a custom report using it. Has anyone come across an EM schema description or know how to determine what objects/queries are behind a page in EM? If the data isn't centralized in the EM schema, I recognize I could create a Group and run a query against DB_DB_LINKS to generate a link report for all the databases. Is that a better way to do it? I'm open to additional suggestions or tips, since I'm new to the custom reporting features ... (and not trying to reinvent the wheel here). Thanks.

There is no table in em repository database that contains db link information for database targets. The way to get this info is create a dblink in your em repository database for each database target then create plsql package that connect to each target over dblink and writes the info into a table in em repository table. You could also just create a sql job from em and run against each database target.
If you need help with the plsql let me know I have several of these in my em to extract specific data I need from each db target.

Double database links

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