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So, given that the image quality is so much higher with a lossless compression algorithm such as PNG, why would you use something lossy such as JPEG compression The simple answer is file size. The higher the JPEG lossiness, the smaller the file size you have to store on disk, and this can be handy in many situations, such as when you want to e-mail a picture to someone or serve many pictures from a Web site. Figure 3-7 compares the file sizes for a lossy compression algorithm against no compression and against PNG compression.

GCC_EXEC_PREFIX, if set, specifies the prefix to use in the names of the subprograms executed by the compiler. This variable does not necessarily specify a directory name because GCC does not add a slash (/) to the front of the prefix when it combines GCC_EXEC_PREFIX with the name of a subprogram. So, if GCC_EXEC_PREFIX is /usr/lib/gcc-lib/i586-suse-linux/4.1/, GCC attempts to invoke the subprogram cc1 as /usr/lib/gcc-lib/i586-suse-linux/4.1/cc1. If GCC_EXEC_PREFIX is custom-, GCC compilers attempt to invoke the subprogram cc1 as custom-cc1.

You can query the system catalog view sys.server_principals in order to view fixed server roles, or you can use the sp_helpsrvrole system stored procedure to view descriptions for each of the roles. To view members of a role (other principals), use the sp_helpsrvrolemember system stored procedure. The next recipe will show you how to add or remove other principals to a fixed server role.

The GCC_EXEC_PREFIX environment variable does not seem to work under Cygwin. I am unclear if this is a function of Cygwin s emulation environment or a problem in a specific version of GCC.

Database principals are the objects that represent users to which we can assign permissions to access databases or particular objects within a database. Whereas logins operate at the server level and allow us to perform actions such as connecting to a SQL Server, database principals operate at the database level, and allow us to select or manipulate data, to perform DDL statements on objects within the database, or to manage users permissions at the database level. SQL Server 2005 recognizes four different types of database principals: Database users. Database user principals are the database-level security context under which requests within the database are executed, and are associated with either SQL Server or Windows logins. Database roles. Database roles come in two flavors, fixed and user-defined. Fixed database roles are found in each database of a SQL Server instance, and have database scoped permissions assigned to them (such as SELECT permission on all tables or the ability to CREATE tables). User defined database roles are those that you can create yourself, allowing you to manage permissions to securables more easily than if you had to individually grant similar permissions to multiple database users. Application roles. Application roles are groupings of permissions that don t allow members. Instead, you can log in as the application role. When you use an application role, it overrides all of the other permissions your login would otherwise have, giving you only those permissions granted to the application role. In this section, I ll review how to create, modify, report on, and drop database users. We ll also cover how to work with database roles (fixed and user-defined) and application roles.

If GCC_EXEC_PREFIX is unset, GCC uses a heuristic to derive the proper prefix based on the path by which you invoked GCC. The default value is PREFIX/lib/gcc-lib/, where PREFIX is the value of --prefix you specified when you configured the GCC script. If you specify -B on the command line, as noted earlier, the command-line specification overrides GCC_EXEC_PREFIX.

In SQL Server 2000, users were granted access with the sp_grantdbaccess system stored procedure. In SQL Server 2005, the CREATE USER command is used instead. The syntax is as follows: CREATE USER user_name [ FOR { LOGIN login_name | CERTIFICATE cert_name | ASYMMETRIC KEY asym_key_name } ] [ WITH DEFAULT_SCHEMA = schema_name ] The arguments of this command are described in Table 17-6. Table 17-6. CREATE USER Arguments

The name of the user in the database. The name of the SQL or Windows login that is mapping to the database user. When designated, this specifies a certificate that is bound to the database user. See 19 for more information on certificates. When designated, this specifies an asymmetric key that is bound to the database user. See 19 for more information on keys. The default schema that the user will belong to, which will determine what schema is checked first when the user references database objects. If this option is unspecified, the dbo schema will be used. This schema name can also be designated for a schema not yet created in the database.