Questions tagged [dblink]

For questions about the Oracle feature that allows accessing data in a different database, or possibly on a different server.

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How to convert UTF8 data from PostgreSQL to AL32UTF8 Oracle DB?

I have a task to import some data from Postgres database to Oracle via dblink The connection between Postgres and Oracle works good, but unfortunately, when I try read data from created view (in ...
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ORA-00997: illegal use of LONG datatype error when query from oracle to mysql over dblink

I created a db link from Oracle (19c) to MySQL (8.0). My MySQL table's columns datatypes are text (I mustn't change the datatype). There are 126 columns in the table (It must be such). When I try to ...
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Why database link cant fetch all rows from view?

recently I moved to use oracle 12c instead of 11g using oracle Linux server , I have a DBLink that select data from another oracle 11g view , when I select * from using the link a number of rows are ...
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Oracle 12c - Opening cursor with remote tables over db link

We just upgraded from 11g SE to 12c SE. Please note, this process worked perfectly under 11g, and only started failing once under 12c. The procedure puts together a query, and then opens up a REF ...
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Same user cannot 'see' view on remote oracle database athough dblink is valid

I am running an impdp job that I have extracted the DDL from to determine why the job hangs. It consistently stops on the first object created using a dblink. I am running the impdp job as system as ...
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MV on remote/master table fails to resume syncing (after master db host was temporarily unreachable)

I have a fast-refresh materialized view in a target db (18c) that syncs from a remote table/master db (19c): --master db (19c) create materialized view log on master.workorder with primary key; --...
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Create fast-refresh MV over dblink on table without PK?

I want to create a materialized view between a primary system (Oracle 18c) and an external system (Oracle 19c) via a dblink. The MV would refresh on a 30-second schedule (since on-commit is not ...
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Materialized view not purging (over dblink via view)

I've created a materialized view between a primary system (Oracle 18c) and an external system (Oracle 19c): create materialized view primary_system.workorder_mv build immediate refresh force on ...
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inserting blob/clob over dblinks

I'm trying to find the best way to load a remote table with a blob column (blob only contains text, so clob would have been better). So far we've been able to reduce loadtime from 218 minutes to 2 ...
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Can an Oracle 19c database dblink to an Oracle 10.2.3 database?

I have an Oracle 12.1.0.2 database that dblinks to an Oracle 10.2.0.3.0 database. I am upgrading the Oracle 12.1.0.2 database to 19c (12.2.0.3). Will my dblinks to the Oracle 10.2.0.3.0 database ...
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Postgresql MVIEW refresh from Oracle Materialized View Log

Is it possible for me to have Oracle MVIEW log in my source database and refresh a Postgresql database MVIEW using this MVIEW log? I know I can query the MVIEW log, I have done that. But since it is ...
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Query Oracle Database On Who Has Create Database Link Privs (private)?

Anybody know a good way to query the entire Oracle database on what users have privs to make private database links? Thank you!!
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Transport-level error when I try to launch a select from SQL Server to Oracle via Dblink

I'm trying to launch a select from Sql Management Studio (SQL Server 2014) on a DBlink that points on an Oracle database that is handled by another company. The results begin to come back to the ...
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SQL Server Agent crashes when scheduled procedures make select in DBLink on an offline Oracle database

I have SQL Server 2014 and I'm using SQL Server Agent to start some scheduled procedures during the day. These procedures make some selects (in DBlink) on an Oracle database that is handled by another ...
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How to get TNS connect strings (like tnsping) to check a dblink via a session?

I would like to know, if there is any chance to get the currently used TNS connect string, that will be used for a DB-Link from a db-server. I'm connected to a schema on a database located on any ...
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ORA-02063 Encoding problem with Oracle querying SQL Server through ODBC link

We have a problem querying some data from the SQL Server from the Oracle database with the ORA-LNX connecting to SQL-SRV using ODBC and Heterogeneous Service (Oracle HS). When we send the query ...
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How to securely store the password for an Oracle DB link?

Having a system consisting of two linked Oracle DBs, we currently have the password for the dblink stored in a table, in order to be able to change it (session issues) and to re-created the dblink in ...
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Is Oracle DBLink Vulnerable? [closed]

We have a web page on internet that calls a web service located on our intranet. The web service talks to Database A to get some data. Database A has a DBLink to Database B. This link is used to ...
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2 answers
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Azure Database Link to another Azure database

How to query between two databases with the same server in SQL Database? Currently we are aiming to link two azure databases that will update simultaneously. Thanks!
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How do you select "array"-type columns via the DBLINK function?

Using PostgreSQL, I can easily do a select statement to return a column that is an array of the datatype point. i.e. colA is the datatype point[] select colA from tbl Returns a column that contains ...
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Oracle procedure takes forever to compile if I use public synonym

I have a procedure that queries a table through a DB link. If my procedure uses a public synonym through the DB link, it takes forever to compile. I'm creating the procedure in Oracle 12c. The DB ...
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2 answers
304 views

Issue with Identifiers in Postgres greater than Oracle's limit while connecting over ODBC (DBLINK)

We have a database link from Oracle 12.1 to Postgres via psqlODBC Driver. There is a problem while running few queries/statements when the Postgres identifiers, like the length of a column name ...
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3 votes
2 answers
5k views

PostgreSQL error: remote query result rowtype does not match the specified FROM clause rowtype, on remote function call

This is my remote function: CREATE OR REPLACE FUNCTION public._test1() RETURNS record LANGUAGE plpgsql AS $function$ DECLARE rec record; BEGIN select 1,2 into rec; return rec; END $function$; ...
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Oracle dblink to MS SQL Server

Can I create a dblink to a SQL Server from Oracle, in the same I would if I was creating a dblink from Oracle to Oracle? I've tried, but get a message saying - connection has closed as partner has ...
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How to parallelise remote queries in Postgres

I am querying N tables remotely using dblink. This queries represent a sort of "sharding" of the data. Each remote query takes roughly the same time (~ 0.5 sec). However when I gather all the data in ...
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Postgresql: Select a table from different database and different host

I know this is not new, but I have not found a solution, even though I have followed several posts in this forum. I'm trying to show table from different database using dblink extension. Installing ...
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How to Oracle DBLink encryption

I have the environment that I explain below and I need to encrypt the data that is sent between my two nodes, I have been reading but I can not find the right solution, I explain: I have an Oracle ...
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2 answers
607 views

Can I use postgres_fdw without foreign tables defined?

I have a production database "PRODdb1", with a read-only user account. I have a need to query(select statement) this database and insert the data into a secondary database named "RPTdb1". I originally ...
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Unable to query remote schema object using partial database link name

I came across a very interesting situation today and I'm putting this question to the community in hopes that someone can explain why this happened. I haven't been able to find an explanation in ...
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How to set up from scratch distributed transaction between SQL Server and Oracle?

For one of our client, I have to solve a problem regarding intermittent transactions failures between an SQL Server 2012 DB engine and an Oracle 12c DB engine. (OLE DB provider "OraOLEDB.Oracle" for ...
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1 answer
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How to access PostgreSQL Functions from Oracle through DBLink?

I'm having two DB server (PostgreSQL, Oracle). I'm able to access the table in PostgreSQL from Oracle through DB-Link. I've use the below query to access the table. select "Cust_Id", "Mobile_No" ...
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5 answers
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IN clause too slow

Ive been searching for about 1 hour and i have not found anything. I have this problem: When I do this query: select order_id from or_order@smartflex where order_id in ( select distinct numeroot ...
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1 vote
0 answers
393 views

Connect ORACLE to SQLSERVER to REMOTE SQL SERVER

I have Sql server and oracle installed on same machine. So I created a heterogeneous connection between the two server. Now I need to do some transaction in my sql server and need to send the result ...
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1 answer
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Unable to access tables in sql server using oracle dblink

I have created a Heterogeneous connection between oracle and sql server. and tested with below query, SELECT * FROM sys.tables@SQLSERVER; Then I have created a new Database in SQL server called "...
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1 vote
1 answer
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Auditing authentication issues in a distributed environment

I'm trying to get a better handle on what locked out a specific user when multiple Oracle databases are involved using database links. Setup: sqlplus kjohnston@db2 create user testuser identified ...
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2 votes
1 answer
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Creating Synonym For a Table in PostgreSQL over dblink?

I have two PostgreSQL databases connected over dblink extension. I want to create synonym for a table in first database so the queries that are coming through application I can route them to the table ...
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1 vote
1 answer
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Updating records in MS Access linked table will activate triggers?

I have a simple yet undocumented (or I could not find the documentation to solve my uneasiness) question, I hope I have come to the right place: I am using MS Access to act as a poor front end for ...
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Oracle DB link: Error line missing

We have a DB link between 2 Oracle 11.2 databases. On the production system, we noticed that when an UPDATE statement of a remote table fails in an PL/SQL procedure (started as a scheduled job), the ...
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2 votes
1 answer
1k views

Call dblink from a trigger function

I have an environment where I have to move data from one database to another once a day. I Try to solve this by calling 'dblink' from a triggered function. The following statement I can execute from ...
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1 answer
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Accessing an external database through pgAdmin installed on my local machine?

I want to query a database stored in an external location. Up to now, I was using Microsoft Access for querying, but due to limitation of 2 GB output file, I am trying to switch to another DBMS, ...
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4 votes
2 answers
7k views

Oracle 12c - Create materialized view results in ORA-00942

I have a view that I can access through a database link as such: SQL> select count(*) from REMOTE_SCHEMA.REMOTE_VIEW@REMOTE_DB; COUNT(*) -------- 110 I can create and successfully query the ...
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1 vote
1 answer
3k views

alter public database link to private in oracle

I have a database link in my database which is created as public as below. CREATE PUBLIC DATABASE LINK dblink_name CONNECT TO usernane USING 'tag'; I have a requirement to convert it to a PRIVATE ...
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3 votes
1 answer
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Is there an equivalent to OPENROWSET in Oracle?

Is there an equivalent to OPENROWSET in Oracle? From OPENROWSET (Transact-SQL): This method is an alternative to accessing tables in a linked server and is a one-time, ad hoc method of connecting and ...
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1 vote
1 answer
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What does remote database have to do for DB link in Oracle

In local database, it has to create DB LINK through CREATE DATABASE LINK. What about remote database side, what does it have to do? On fixed user link, local database need to know ID and password set....
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3 votes
3 answers
10k views

Connecting Oracle 11g to Postgres via dblink

I have administrator access to our Oracle database , but was wondering if its possible to connect an Oracle 11g database to Postgres database and if so, what steps would I need to follow. I've seen ...
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1 answer
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Why can't I restore the DB from an SQL dump in PostgreSQL 9.4 (problem with dblink)?

I have created a dump of a DB using: pg_dump db_name > db_dump.sql and proceed to restore it with: psql --single-transaction db_name < db_dump.sql Prior to attempting to restore the DB, I ...
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Want to remove global_name from DB links (Oracle 11g)

I am trying to call remote function via DB LINKS. However, My global name contains the string ON and I believe it causes an error. The Error I have is ... SQL> var tmp varchar2(2); SQL> ...
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5 votes
1 answer
19k views

How to create an Oracle Database Link when the password has special characters

I'm trying to create a DBLink. SQL Developer is the client I'm using. The password to my remote user has *'s in it. I'm having trouble figuring this out. This syntax isn't working: CREATE DATABASE ...
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2 votes
2 answers
12k views

Why am I able to query a remote database without a dblink?

While researching a security concern, I discovered that users are able to query a remote database without the need of a dblink. However, this was only true for databases that had no value for ...
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5 votes
3 answers
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query to find all dblink()

Besides manually searching for all the dblink() used in triggers/functions/stored procedures is there a way to query for this information? Example: There is a dblink inside of a trigger, can I select ...
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