How do I see all DB links?
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.
What are DB links?
A database link is a pointer that defines a one-way communication path from an Oracle Database server to another database server. The link pointer is actually defined as an entry in a data dictionary table. To access the link, you must be connected to the local database that contains the data dictionary entry.
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. For this reason, public database links may pose some potential security risks.
How do I find my DB Link password?
If it is a db link that you created, you can see the password in plain text in the user_db_links view. If it is not one you created, you are out of luck, with out without dba privileges.
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. However, to access non-Oracle systems you must use Oracle Heterogeneous Services.
How do you check db link is working or not?
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 can I connect two database in SQL?
The tables and databases will be created under the same server….Join Tables from Different Databases in SQL Server
- Step 1: Create the first database and table.
- Step 2: Create the second database and table.
- Step 3: Join the tables from the different databases in SQL Server.
- Step 4 (optional): Drop the databases created.
How do I recreate a DB Link?
4. How To Recreate Database Links?
- Backup the existing database link.
- Connect as the database link owner.
- Test the database link.
- Drop the database link drop database link DB_LINK_NAME;
- Create the database link create database link DB_LINK_NAME connect USER identified by PASSWORD using ‘connect_string’;
Can I join tables from different databases?
SQL Server allows you to join tables from different databases as long as those databases are on the same server. The join syntax is the same; the only difference is that you must fully specify table names.
How do I link two databases together?
The Get External Data – Access Database import and link wizard opens. In the File name text box, type the name of the source database or click Browse to display the File Open dialog box. Click Link to the data source by creating a linked table, and then click OK. The Link Tables dialog box opens.
How to get the data dictionary of a SQL Server database?
You can get at this via a combination of SELECT * FROM INFORMATION_SCHEMA.COLUMNS and using fn_listextendedproperty. Show activity on this post. To generate a data dictionary of your SQL Server database, I suggest you use ERBuilder data modeller, just follow these steps:
What information do data dictionary views contain about database links?
These data dictionary views contain the same basic information about database links, with some exceptions: Which Views? The user who created the database link. If the link is public, then the user is listed as PUBLIC. The name of the database link.
What is the gateway data dictionary in SQL Server?
The gateway data dictionary is similar to the Oracle database data dictionary in appearance and use. The following paragraphs describe the Oracle Database Gateway for SQL Server data dictionary support. SQL Server data dictionary information is stored in the SQL Server database as SQL Server system tables.
How to determine which database links are available to that user?
Creation time of the database 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. The following script queries the DBA_DB_LINKS view to access link information: