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Different DBMS brands vary in the way they actually implement stored procedures. In several brands, the stored procedure text is stored within the database and is interpreted when the procedure is executed. This has the advantage of creating a very flexible stored procedure language, but it creates significant runtime overhead for complex stored procedures. The DBMS must read the statements that make up the stored procedure at runtime, parse and analyze them, and determine what to do on the fly. Because of the overhead in the interpreted approach, some DBMS brands compile stored procedures into an intermediate form that is much more efficient to execute. Compilation may be automatic when the stored procedure is created, or the DBMS may provide the ability for the user to request stored procedure compilation. The disadvantage of compiled stored procedures is that the exact technique used to carry out the stored procedure is fixed when the procedure is compiled. Suppose, for example, that a stored procedure is created and compiled soon after a database is first created, and later some useful indexes are defined on the data. The compiled queries in the stored procedure won t take advantage of these indexes, and as a result, they may run much more slowly than if they were recompiled. To deal with stale compiled procedures, some DBMS brands automatically mark any compiled procedures that may be affected by subsequent database changes as being in need of recompilation. The next time the procedure is called, the DBMS notices the mark and recompiles the procedure before executing it. Normally, this

20:

Data Control Language (DCL)

approach provides the best of both worlds the performance benefits of precompilation while keeping the compiled procedure up to date. Its disadvantage is that it can yield unpredictable stored procedure execution times. When no recompile is necessary, the stored procedure may execute quickly; when a recompile is activated, it may produce a significant delay; and in most cases, the recompile delay is much longer than the disadvantage of using the old compiled version. To determine the stored procedure compilation capabilities of a particular DBMS, you can examine its CREATE PROCEDURE and EXECUTE PROCEDURE statement options or look for other procedure management statements such as ALTER PROCEDURE.

DBMS brands that support stored procedures sometimes provide built-in, systemdefined stored procedures to automate database processing or management functions. Sybase SQL Server pioneered this use of system stored procedures. Today, hundreds of Transact-SQL system stored procedures provide functions such as managing users, database roles, job execution, distributed servers, replication, and others. Most Transact-SQL system procedures follow this naming convention: I SP_ADD_something. Adds a new object (user, server, replica, and so on) I SP_DROP_something. Drops an existing object I SP_HELP_something. Gets information about an object or objects For example, the SP_HELPUSER procedure returns information about the valid users of the current database.

Although stored procedures written in the extended SQL dialects of the major enterprise DBMS brands can be quite powerful, they have limitations. One major limitation is that they do not provide access to features outside the DBMS, such as the features of the operating system or other applications running on the same computer system. The extended SQL dialects also tend to be fairly high-level languages, with limited capability for the lower-level programming usually done in C or C++. To overcome these limitations, some DBMS brands provide access to external stored procedures. An external stored procedure is a procedure written in a conventional programming language (such as C or Pascal) and compiled outside the DBMS itself. The DBMS is given a definition of the procedure s name and its parameters, along with other essential information such as the calling conventions used by the programming language in which the stored procedure was written. Once defined to the DBMS, the external stored procedure can be called as if it were a SQL stored procedure. The DBMS handles the

Data Control Language (DCL) includes SQL statements that allow administrators to control access to the data within the database and the use of various DBMS system privileges, such as the ability to start up or shut down the database. SQL statements that use the commands GRANT and ALTER are considered part of DCL. DCL is presented in 8.

call, turns over control to the external procedure, and then receives any return values and parameters. Microsoft SQL Server provides a set of system-defined external stored procedures that provide access to selected operating system capabilities. The XP_SENDMAIL procedure can be used to send electronic mail to users, based on conditions within the DBMS:

XP_SENDMAIL @RECIPIENTS = Joe , Sam , @MESSAGE = Customer table nearly full ;

Similarly, the XP_CMDSHELL external procedure can be called to pass commands to the underlying operating system on which SQL Server is operating. Beyond these predefined external procedures, SQL Server allows a user-written external procedure to be stored in a dynamic-linked library (DLL) and called from within SQL Server stored procedures. Informix provides basic access to underlying operating system capabilities with a special SYSTEM statement. In addition, it supports user-written external procedures through its CREATE PROCEDURE statement. Where the statement block comprising the body of an Informix SPL procedure would appear, an EXTERNAL clause specifies the name, location, and language of the externally written procedure. With the procedure defined in this way, it can be called in the same way as native Informix SPL procedures. Newer versions of Oracle (Oracle8 and later) provide the same capability, also via the CREATE PROCEDURE statement. IBM s DB2 database family provides the same set of capabilities.