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What is cross db ownership chaining?
Cross-database ownership chaining, also known as cross-database chaining, is a security feature of SQL Server that allows users of databases access to other databases besides the one they are currently using. Cross-database is an extension of ownership chaining and does the same process but across databases.
What is ownership chaining?
Ownership chaining is a security feature in SQL Server which occurs when all of the following conditions are true: A user (which could be an app through a login/service account) tries to access an object that makes a reference to another object.
What are access rights?
A. The permissions that are granted to a user, or to an application, to read, write and erase files in the computer. Access rights can be tied to a particular client or server, to folders within that machine or to specific programs and data files.
How do I enable OLE Automation in SQL Server?
By default, SQL Server blocks access to OLE Automation stored procedures because this component is turned off as part of the security configuration for this server. A system administrator can enable access to OLE Automation procedures by using sp_configure.
What is database owner in SQL Server?
In SQL Server, the dbo or Database Owner is a server-level principal that has full access to the owned database. Microsoft’s best practices recommend creating a discrete user, either an Active Directory domain user or group, or a SQL Server Authentication user, to use as the database owner.
When to enable or disable cross database ownership chaining?
This server option allows you to control cross-database ownership chaining at the database level or to allow cross-database ownership chaining for all databases: When cross db ownership chaining is off (0) for the instance, cross-database ownership chaining is disabled for all databases.
How does cross database chaining work in SQL Server?
If we turned ON at the server level, cross-database chaining is enabled for all databases on that SQL Server instance, regardless of individual database settings and we can’t restrict it at the database level. The following statement turns ON cross-database ownership chaining at the server level.
Is it safe to set cross DB to 1?
Setting cross db ownership chaining to 1 is not recommended unless all of the databases hosted by the instance of SQL Server must participate in cross-database ownership chaining and you are aware of the security implications of this setting.
How is ownership chain determined in a database?
The way the ownership chain is determined is similar to an ownership chain within a database. The exception is that the owner of each object is ultimately mapped to a login, if that is possible (it must be for a cross database ownership chain to form).