Oracle Maestro online help
Database links
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.
Once you have created a database link, you can use it to refer to tables and views on the other database. 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.
New database links are created within Create Database Link Wizard. In order to run the wizard you should either
| • | select the Object | Create Database Object... main menu item; |
| • | select the Database link icon in the Create Database Object dialog |
or
| • | select the Database link list or any object from that list in the explorer tree; |
| • | select the Create New Database Link... item from the popup menu |
or
| • | open the schema in Schema Editor and the Database link tab there; |
| • | press the Insert key or select the Create New Database Link... item from the popup menu (alternatively, you may use the corresponding link of the Navigation Bar). |
To create a new database link with the same properties as one of the existing database link has:
| • | select the Object | Duplicate Database Object... main menu item; |
| • | follow the instructions of Duplicate Object Wizard. |
|
Database links can be edited within Database link Editor. In order to run the editor you should either
| • | select the database link for editing in the explorer tree (type the first letters of the database link name for quick search); |
| • | select the Edit Database Link ... item from the popup menu |
or
| • | open the schema in Schema Editor and the Database Links tab there; |
| • | select the database link to edit; |
| • | press the Enter key or select the Edit Database Link item from the popup menu (alternatively, you may use the corresponding link of the Navigation Bar). |
You can change the name of the database link using the Rename Database Link dialog. To open the dialog you should either
| • | select the database link to rename in the explorer tree; |
| • | select the Rename Database Link item from the popup menu |
or
| • | open the schema in Schema Editor and the Database Links tab there; |
| • | select the database link to rename; |
| • | select the Rename Database Link item from the popup menu (alternatively, you may use the corresponding link of the Navigation Bar). |
|
To drop a database link:
| • | select the database link to drop in the explorer tree; |
| • | select the Drop Database Link item from the popup menu |
or
| • | open the schema in Schema Editor and the Database Links tab there; |
| • | select the database link to drop; |
| • | press the Delete key or select the Drop Database Link item from the popup menu (alternatively, you may use the corresponding link of the Navigation Bar) |
and confirm dropping in the dialog window.
|
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