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One of the points I have tried to emphasize throughout this book is that all GCC compilers are actually a sequence of programs that are executed in order. The idea of writing smaller programs that do one thing and do it well, and then chaining them together, is the classic Unix programming paradigm. For example, gcc is a driver program that does its job by invoking a sequence of other programs to do the heavy lifting of preprocessing, compiling, assembling, and linking. In general, the command-line parameters and filename arguments that you pass to any GCC compiler help it decide which helper and back-end programs to invoke and how to invoke them. Spec strings control the invocation of the helper programs. A spec string is a list of options passed to a program. Spec strings can contain variable text substituted into a command line, or text that might or might not be inserted into a command line based on a conditional statement (in the spec string). Using the flexible constructs provided by spec strings, it is possible to generate quite complex command lines. A spec file is a plain text file that contains spec strings. Spec files contain multiple directives separated by blank lines. The type of directive is determined by the first nonwhitespace character on the line. In most cases there is one spec string for each program that a GCC compiler can invoke, but a few programs have multiple spec strings to control their behavior.

In the second example of this recipe, a database user name is changed: USE TestDB GO ALTER USER Veronica WITH NAME = VSanders

The ALTER USER command allows you to perform one of two changes: renaming a database user or changing a database user s default schema. The first example changed the default schema of the Joe login to the Production schema. The second example renamed the database user Veronica to VSanders.

Prior to version 4.0 of GCC, the spec strings used by default by all of the GCC compilers were generated and stored in a single text file. It was common practice to query and potentially modify aspects of the behavior of various GCC compilers by examining and modifying this file. This file was typically installed as prefix/lib/gcc/ system-type/gcc-version/specs. For example, on a 64-bit AMD system, the specs file for a set of GCC 3.4.4 compilers installed into /usr/local/gcc3.4.4 would have been the file /usr/local/gcc-3.4.4/lib/gcc/x86_64-unknown-linux/ gnu/3.4.4/specs. With GCC 4.0 and greater, the spec strings used by the GCC compilers are no longer stored in a single text file. If you want to modify spec strings, you must first use the dumpspecs option to dump the internal set of spec strings used by your compiler, redirecting the output of this command into a file. You can then modify this file to your heart s content and then load it using the -specs=file option.

In SQL Server 2000, the sp_dropuser system stored procedure was used to drop a user from a database. In SQL Server 2005, the DROP USER command is used instead. The syntax is as follows: DROP USER user_name The user_name is the name of the database user, as this example demonstrates: USE TestDB GO DROP USER VSanders

To override the spec strings built into the GCC compilers (and after generating the specs file, if necessary), use the -specs=file option to specify an alternative or additional spec file named file. The GCC compiler driver reads the specified file after reading the defaults from the standard specs file. If you specify multiple spec files, the compiler driver processes them in order from left to right. Table A-10 lists the possible spec file directives.

The DROP USER command removes a user from the database, but does not impact the Windows or SQL login that is associated to it. Like DROP LOGIN, you can t drop a user that is the owner of database objects. For example, if the database user Joe is the schema owner for a schema called Test, you ll get an error like the following: Msg 15138, Level 16, State 1, Line 2 The database principal owns a schema in the database, and cannot be dropped.

Executes the spec file command specified by command (see Table A-11) Creates, deletes, or overrides the spec string specified by spec_name Creates a new suffix rule specified by suffix

When you migrate a database to a new server (by using BACKUP/RESTORE, for example) the relationship between logins and database users can break. A login has a security-identifier (sid) which uniquely identifies it on the SQL Server instance. This sid is stored for the login s associated database user in each database that the login has access to. Creating another login on a different SQL Server instance with the same name will not recreate the same sid. The following query demonstrates this link by joining the sys.database_principals system catalog view to the sys.server_principals catalog view on the sid column: SELECT s.name LoginName, d.name DbName, d.sid FROM sys.database_principals d INNER JOIN sys.server_principals s ON d.sid = s.sid WHERE s.name = 'Veronica'