Oracle dblink
时间: 2023-11-30 11:19:39 浏览: 42
Oracle database link (DB link) is a connection between two Oracle databases that allows a user to access data from one database to another. It is a way to connect to a remote database and access its data as if it were a local database.
By creating a DB link, users can query tables or views across databases and use stored procedures or functions that reside in the remote database. This is particularly useful in distributed database environments where data is spread across multiple databases and needs to be accessed and consolidated.
DB links can be created using the CREATE DATABASE LINK statement and can be authenticated using passwords or by configuring trusted connections between the databases. The syntax for accessing tables or views across databases using a DB link is:
SELECT * FROM remote_table@dblink_name;
Here, remote_table is the name of the table or view in the remote database, and dblink_name is the name of the DB link that connects to the remote database.
DB links have some security concerns as they allow access to data in another database. Therefore, it is important to ensure that proper security measures are in place, such as encrypting the password and restricting access to the DB link only to authorized users.