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A good way around this is to create a view in SCHEMA_B that exposes the table you want to access through the database link. This will also give you good control over who is allowed to select from the database link, as you can control the access to the view. Do like this:
14 Νοε 2011 · These views are helpful for working with DB links in Oracle: DBA_DB_LINKS - All DB links defined in the database; ALL_DB_LINKS - All DB links the current user has access to; USER_DB_LINKS - All DB links owned by current user; See more in Oracle documentation
Most commonly, a database link is used to connect to a user in a remote database, where the USING clause points to an entry in the database servers "tnsnames.ora" file. For local links, the special entry of 'local' is used. Basic Usage. Once a database link is created, for example the "scott_remote" link, remote objects can be referenced as ...
4 ημέρες πριν · We have a query which has to get a set of rows over the db link which has a CONTAINS predicate on a column of CLOB. E.g. There is a DB A and DB B with table T1( c1 varchar2(10),c2 clob) . I want to run a query from DB A using dblink on DB B to query T1 which has a CONTAINS predicate on c2 and based on the query the rows have to return c1 from t1.
27 Δεκ 2023 · A database link is a schema object in one database that enables you to access objects on another database. The remote database may be on the same system or on a different system. Once the link is set, you can access the remote database by referencing the database link in SQL statements.
Hierarchical queries come with operators, pseudocolumns and functions to help make sense of the hierarchy. LEVEL : The position in the hierarchy of the current row in relation to the root node. CONNECT_BY_ROOT : Returns the root node(s) associated with the current row.
26 Σεπ 2023 · Creating a database link in Oracle using DbVisualizer is a simple and straightforward process. By following a step-by-step guide, you can easily establish a connection between two separate databases, allowing you to access remote data as if it were stored in your local database.
