What is difference between private and public DB Link?

What is difference between private and public 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.

What is a DB link with example?

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. In SQL statements, you can refer to a table or view on the other database by appending @dblink to the table or view name.

How do I create a private database link?


  1. Connect to the Maximo® database as the maximo user.
  2. Define a new SID by creating a tnsnames. ora entry for the remote GIS database.
  3. Create the database link by running the following command: CREATE DATABASE LINK CONNECT TO IDENTIFIED BY ” ” USING ‘ ‘ For example:

What are the types of the database links are there?

There are two types of database links: public and private. Private database links are visible to the owners while public database links are visible to all users in the database.

How do I know if my DBlink is private or public?

If application schema’s password is not known to DBA. 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.

What is DBlink in Postgres?

dblink is a module that supports connections to other PostgreSQL databases from within a database session. See also postgres_fdw, which provides roughly the same functionality using a more modern and standards-compliant infrastructure.

How do I find where a DB Link is used?

Any user can query USER_DB_LINKS to determine which database links are available to that user. Only those with additional privileges can use the ALL_DB_LINKS or DBA_DB_LINKS view.

How do I get rid of a private DB Link?

To drop a private DB_LINK either we need to change user password or we need to know user password, Instead of that we can drop DB_LINKS using this procedure. a) Check the existing DB_LINK of user “CKPT”. b) Drop the DB_LINK from “SYS” user. C) Create a procedure as below from “SYS” user.

How do I know if my Dblink is private or public?

How do I find private DB links?

How do I find the DDL of a DB Link?

Here is a simple script to extract the DB Links DDL with the encripted password. SET LONG 9000 — to print the complete string SELECT DBMS_METADATA. GET_DDL(‘DB_LINK’,a. db_link,a….Share this:

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What is the difference between public and private database links?

According to documentation, a Private Database Link is more secure than a public or global link, because only the owner of the private link, or subprograms within the same schema, can use the link to access the remote database.

To create a private database link, you use the CREATE DATABASE LINK statement as follows: First, specify the name of the database link after the CREATE DATABASE LINK keywords. Second, provide user and password of the remote database after the CONNECT TO and IDENTIFIED BY keywords.

Who can use a link to access a database object?

All users and PL/SQL subprograms in the database can use the link to access database objects in the corresponding remote database. User called PUBLIC. View ownership data through views shown for private database links. Creates a network-wide link.

Are database links transparent to users of a distributed database?

After you have enabled global naming, database links are essentially transparent to users of a distributed database because the name of a database link is the same as the global name of the database to which the link points. For example, the following statement creates a database link in the local database to remote database sales: