Granting and revoking privileges on federated procedures.
Asynchronous execution of federated statements: summary.
There will be a demilitarized, federated United States of Europe.
Asynchrony can significantly improve the performance of federated queries.
Once an application is connected to the federated database, it can access all authorized objects in the federated system.
With a federated database, you can use a single SQL statement that joins data from multiple data sources, including the federated database itself.
Create a new mapping model between each data source model and the federated model.
The section thereafter summarizes the scope and impact of asynchrony in federated execution plans.
Remote objects such as tables and views are registered on the federated server as nicknames.
Nicknames are created in the federated database to identify data source tables and views.
Nicknames do not support triggers, nor do the Materialized Query Tables (MQTs) sometimes used to cache federated data.
Since the remote procedure referenced by the federated procedure is not managed by the federated server, the level chosen cannot be enforced during the execution of the procedure at the data source.
Observant readers might suspect that the XML data returned from a federated search will be in various unpredictable XML vocabularies.
Prodromou recounted a few of the recently developed standards that could bring about, in his words, a "federated social Web."
Users of a federated database system can pose distributed queries over data stored anywhere in the federated system, regardless of its location or the SQL dialect of the data source.
We consider materialized query table (MQT) support an important option to further fine tune the performance of your federated server.
When it detects a potential update target, the federated system avoids using the block fetch feature in order to maintain the remote cursor position.
The information about federated objects is stored in the DB2 system catalogs, also known as the global catalog in Figure 2.
It works well for readily available sites like search engines, online bookstores, and even many library catalogs, but secured e-journal databases need federated search to be installed.
We also discuss the scalability benefits the fenced wrapper can bring to federated servers supporting a high number of concurrent users.
Note: These parameters count in the NUMBER of parameters clause but they do not appear as parameters of the federated procedure.
The server option can be set in two different ways, depending on whether the capability is to be enabled only for a particular application or for all federated applications that access that source.
Federation takes you to the next level of information integration, allowing the DB2 federated system to act as a virtual database where remote objects can be queried like local tables.
Elapsed time measured in both cases was quite close, with the elapsed time per row returned by the federated stored procedure actually somewhat less than that of the native stored procedure.
For example, a browser search link for "science databases" can pass search keywords to the library's federated search software to return results from a selected group of science databases.
