What is a DB link with example?

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 find my DB Link?

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 call a DB Link?

CREATE OR REPLACE FUNCTION “MC”. “Get_REFTYPES”( param1 IN VARCHAR, param2 IN NUMBER, param3 IN DATE DEFAULT SYSDATE ) RETURN RefType_T PIPELINED IS CURSOR cur_st ( cur_param1 VARCHAR, cur_param2 NUMBER, cur_param3 DATE ) IS select TypeID FROM ……

How does a DB Link work?

A database link allows a user or program to access database objects such as tables and views from another database. When accessing a remote table or view over the database link, the Oracle database is acting as an Oracle client.

How do you check DB Link is public or private?

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 a public database link?

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. Specification of the PUBLIC option creates a public database link. If omitted, a private database link is created.

How do I see all DB links?

2 Answers

1. DBA_DB_LINKS – All DB links defined in the database.
2. ALL_DB_LINKS – All DB links the current user has access to.
3. USER_DB_LINKS – All DB links owned by current user.

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 do I know if my DB link is valid?

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.

How do I know if my DB link is public or private?

What is a database link?

A database link is a connection from the Oracle database to another remote database. The remote database can be an Oracle Database or any ODBC compliant database such as SQL Server or MySQL. Why do you need a database link

How to create a public dB link?

Suppose we have two databases with two different machines then use the below steps for creating a public DB Link. Create a new user and grant some privileges, if the user already exists in your database then you don’t need to create any user just grant the privileges only.

What is the use of dB link in PL SQL?

In that case you can create synonym using db link and use that synonym in PL SQL code. Verifications : If you want to check communication between multiple databases you can use DB link. Security : For security reason you can create seperate user for remote database for db link creation and never give to anyone.

What is a database link in Salesforce?

A database link allows a user or program to access database objects such as tables and views from another database. Once you create a database link, you can access the tables or views from the remote database using the following pattern: For example, you can query data from a table in the remote database as if it was in the local server: