How do I SELECT data using DB Link?

How do I SELECT data using DB Link?

In SQL statements, you can refer to a table or view on the other database by appending @dblink to the table or view name. You can query a table or view on the other database with the SELECT statement. You can also access remote tables and views using any INSERT , UPDATE , DELETE , or LOCK TABLE statement.

How do I find the database link in Oracle?

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 does Oracle Database link work?

When the database link in the preceding query is used, Oracle will log into the database specified by the database link, using the username and password provided by the link. It then queries the BOOKSHELF table in that account and returns the data to the user who initiated the query.

How can I connect two databases in Oracle?


  1. First, specify the name of the database link after the CREATE DATABASE LINK keywords.
  2. Second, provide user and password of the remote database after the CONNECT TO and IDENTIFIED BY keywords.
  3. Finally, specify the service name of the remote database.

How do you check DB Link is working or not in Oracle?

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 you check the DB Link is working or not?

How do you check DB Link is working or not?

How do I create a database link between two Oracle instances?

Create database link NAME connect to USERNAME identified by PASSWORD using ‘SID’; Specify SHARED to use a single network connection to create a public database link that can be shared among multiple users. If you specify SHARED, you must also specify the dblink_authentication clause.

How do I create a database link in another schema?

Simple solution is to create anonymous block which will first create dummy function in another schema and then reuse it to create or drop an object(in our case database link). Of course it can be reused to do other types of object as well. SQL> CONNECT / AS SYSDBA Connected.

How do I connect two databases in SQL Server?

Join Tables from Different Databases in SQL Server

  1. Step 1: Create the first database and table.
  2. Step 2: Create the second database and table.
  3. Step 3: Join the tables from the different databases in SQL Server.
  4. Step 4 (optional): Drop the databases created.

How do I know if my DB Link is working?

Can I access my Oracle database from home?

Answer: On a Windows machine the Oracle home information can be found in the system registry. To look at the homes use this workflow: 1. From your PC, click Start | Run 2. In the Run dialog box, type “regedit” and press Return 3. The registry will now be displayed 4. Expand the folder called [HKEY_LOCAL_MACHINE]SOFTWAREORACLE

How to create and use database link in Oracle?

Setup PostgreSql User: We will create user fdw_user and provides it with ALL grants on the public schema of postgres database.

  • Install PostgreSql ODBC Drivers: Use OS command yum install postgresql-odbc to install PostgreSQL ODBC drivers.
  • Edit odbc.ini fileest DSN’s connectivity: Create file odbc.ini under/etc directory.
  • How to create a database link?

    Setup MySql User in MySQL Cluster

  • Install MySQL ODBC Drivers in Oracle Server
  • Edit odbc.ini fileest DSN’s connectivity in Oracle Server
  • Create initMYSQL.ora file in Oracle Server
  • Configure tnsname.ora&listener.ora file in Oracle Server
  • Create DB Linkest Connectivity in Oracle Server
  • How can I Create Read only database link in Oracle?

    What Are Database Links?

  • Why Use Database Links?
  • Global Database Names in Database Links
  • Names for Database Links
  • Types of Database Links
  • Users of Database Links
  • Creation of Database Links: Examples
  • Schema Objects and Database Links
  • Database Link Restrictions