How do I disable a DB Link?

But if you’re still in 11g you want to be able to disable all database links before the open. That can be done in the instance, steeing the open_links parameter to zero in your spfile. Let’s see an example: SQL> alter system set open_links=0 scope=spfile; System altered.

How do I drop a database link in Oracle?

Use the DROP DATABASE LINK statement to remove a database link from the database. A private database link must be in your own schema. To drop a PUBLIC database link, you must have the DROP PUBLIC DATABASE LINK system privilege.

Can you alter a database link in Oracle?

To alter a public database link, you must have the ALTER PUBLIC DATABASE LINK system privilege. The ALTER DATABASE LINK statement is intended only to update fixed-user database links with the current passwords of connection and authentication users.

What privileges are needed for Oracle Link?

Prerequisites. To create a private database link, you must have the CREATE DATABASE LINK system privilege. To create a public database link, you must have the CREATE PUBLIC DATABASE LINK system privilege. Also, you must have the CREATE SESSION system privilege on the remote Oracle database.

How do you check DB Link is working or not?

We can verify public database link using select * from dual@public_db_link; How private db links can be verified by a DBA if application schema’s password is not known.

How do I change the public database link in Oracle?

To execute the ALTER DATABASE LINK and ALTER PUBLIC DATABASE LINK statements, your account needs to have the ALTER DATABASE LINK SYSTEM and ALTER PUBLIC DATABASE LINK system privilege respectively.

How do I drop and recreate a DB Link?

4. How To Recreate Database Links?

1. Backup the existing database link.
2. Connect as the database link owner.
3. Test the database link.
4. Drop the database link drop database link DB_LINK_NAME;
5. Create the database link create database link DB_LINK_NAME connect USER identified by PASSWORD using ‘connect_string’;

Can we rename DB link in Oracle?

0.4) There are no supported solutions for renaming DB links in 12c without knowing the password. The expdp/impdp does not offer the possibility to change the dblink name (AFAIK). …

How do I know if my Dblink is working?

Go to Schema Browser | DB Links tab | highlight the DB Link name you want to test | then click on the “Test Database Link” icon (lightning bolt icon) | and it should give you the test results like below.

What is exempt access policy?

EXEMPT ACCESS POLICY. The EXEMPT ACCESS POLICY privilege allows a role to execute a SQL command without invoking any policy function that may be associated with the target database object. That is, the role is exempt from all security policies in the database.

What is a database link in Oracle?

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.

What is private DB Link?

Database links can be public or private. A public database link is one that can be used by any user. A private database link can be used only by the database link’s owner.

How to disable all database links before open in 11g?

But if you’re still in 11g you want to be able to disable all database links before the open. That can be done in the instance, steeing the open_links parameter to zero in your spfile. SQL> alter system set open_links=0 scope=spfile; System altered. startup force ORACLE instance started.

How do I disable the database link in SQL Server?

There’s no command to disable the database link but there are ways to avoid using them. Remove the TNS entry the DB link is using. Get the DDL of the existing DB link then drop it. Complete your whatever work you wish to complete and then recreate it with the DDL you have collected.

How to disable a single dB link at runtime?

If you just want to disable a single DB link at runtime, you could alter it so that it points to a non existing alias or SID (not to a non-existing address though, it will wait for a longish timeout before returning an error), i.e. if its defined as 192.168.1.100:1521/TEST you just change it temporarily to 192.168.1.100:1521/TESTXYZ

How to disable all database links before opening a duplicate?

You can add the NOOPEN to the duplicate statement. Then the duplicate leaves the database in MOUNT and you can open it in restricted mode and do anything you want before opening it to your users. But if you’re still in 11g you want to be able to disable all database links before the open.