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In this example, the owner of the HumanResources schema is changed to the database user Veronica: ALTER AUTHORIZATION ON Schema::HumanResources TO Veronica In this second example, the owner of an endpoint (for more on endpoints, see 15) is changed to a SQL login. Before doing so, the existing owner of the endpoint is verified using the sys.endpoints and sys.server_principals system catalog views:

SELECT p.name OwnerName FROM sys.endpoints e INNER JOIN sys.server_principals p ON e.principal_id = p.principal_id WHERE e.name = 'ProductWebsite' This returns: OwnerName -------------------------JOEPROD\Owner (1 row(s) affected) Next, the owner is changed to a different SQL login: ALTER AUTHORIZATION ON Endpoint::ProductWebSite TO Veronica Re-executing the query against sys.server_principals and sys.endpoints, the new owner is displayed: OwnerName -----------------Veronica (1 row(s) affected)

-ftree-vect-loop-version: This optimization option tells GCC to do loop versioning when doing loop vectorization, generating both vectorized and nonvectorized versions of the loop that are selected at runtime based on checks for alignment or dependencies This option is enabled at all optimization levels except for -Os -ftree-vectorize: This optimization option tells GCC to perform loop vectorization on trees and is enabled at all optimization levels -ftree-vectorizer-verbose=n: Specifying this debugging option controls the amount of debugging information produced during loop vectorization When n = 0, no output is produced Higher values of n produce increasing amounts of information about loops that were vectorized, loops that were considered for vectorization, and loops that were not vectorized -funroll-all-loops: This optimization causes GCC to unroll all loops, even if the number of times they are executed cannot be guaranteed when the loop is entered.

This recipe demonstrated how to change object ownership. You may wish to change ownership when a login or database user needs to be removed. If that login or database user owns securables, you can use ALTER AUTHORIZATION to change that securables owner prior to dropping the SQL login or database user. In this recipe, ALTER AUTHORIZATION was used to change the owner of a schema to a different database user, and the owner of an endpoint to a different SQL login (associated to a Windows account). In both cases, the securable name was prefixed by the :: scope qualifier, which designates the type of object you are changing ownership of.

Though this usually makes programs run more slowly, it provides opportunities for subsequent optimization through code elimination..

In this chapter, I ve discussed permissions and securables within a SQL Server instance, however sometimes a SQL login (not associated to a Windows user or group) may need permissions outside of the SQL Server instance. A Windows principal (a Windows user or group) has implied permissions outside of the SQL Server instance, but a SQL login does not, because a SQL login and password is created inside SQL Server. New in SQL Server 2005, you can now bind a SQL login to a Windows credential, giving the SQL login the implied Windows permissions of that credential. This SQL login can then use more advanced SQL Server functionality, where outside resource access may be required. This credential can be bound to more than one SQL login (although one SQL login can only be bound to a single credential). To create a credential, use the CREATE CREDENTIAL command. The syntax is as follows: CREATE CREDENTIAL credential_name WITH IDENTITY = ' identity_name '

-funroll-loops: This optimization causes GCC to unroll loops, but limits the loops that will be unrolled to those where the number of times they are executed can be determined at compile time or when entering the loop Using this option implies both the -fstrength-reduce and -frerun-cse-after-loop options Using this option makes code larger but does not guarantee improved performance or execution speed It does provide opportunities for subsequent optimization through other GCC optimization options -funsafe-loop-optimizations: This optimization option tells GCC to enable additional loop optimizations by assuming that all loop indices are valid and that no loops with nontrivial exit conditions are not infinite -funsafe-math-optimizations: This optimization option enables GCC to perform optimizations for floating-point arithmetic that assumes that arguments and results are valid and may violate IEEE or ANSI standards.

The arguments for this command are described in Table 18-20. Table 18-20. CREATE CREDENTIAL Arguments