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There are several ways to change the name of a stored procedure. If you use sp_rename or a command of Enterprise Manger, SQL Server will change the name of the object in the sysobjects table, but it will not affect code of the stored procedure. You might receive unexpected results if you try to execute the Create Procedure statement or the Alter Procedure statement after that. sp_rename was designed to change the names of all database objects (including tables, views, columns, defaults, rules, and triggers). In fact, the versatility of this stored procedure is the reason the code is not changed in the previous example. The stored procedure is designed only to change the names of objects in the sysobjects table. Database objects with code such as stored procedures, views, and user-defined functions require a different strategy. It is better to drop them and create them again. Again, do not forget to change all associated objects, such as permissions, at the same time. The Alter Procedure statement cannot help us in this case, since we need to change the name of the stored procedure.

NOTE: Unfortunately, it is not possible to collect information if a stored procedure returns more than one resultset, as is the case with sp_spaceused.

Note that this intraquery parallelism occurs only if there are processors to spare that is, if the number of processors is greater than the number of connections In addition, intraquery parallelism is not considered if the query is not resource-expensive to run, and the threshold for what constitutes.

This technique also works with the Exec statement. For example, if you try to collect a resultset from the DBCC command this way, SQL Server will return an error. But you can encapsulate the DBCC statement in a string and execute it from Exec. The following stored procedure returns the percentage of log space used in a specified database:

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Create Procedure prLogSpacePercentUsed -- return percent of space used in transaction log for -- specified database ( @chvDbName sysname, @fltPercentUsed float OUTPUT ) As Set Nocount On Declare @intErrorCode int Set @intErrorCode = @@Error If @intErrorCode = 0 Begin Create Table #DBLogSpace ( dbname sysname, LogSizeInMB float, LogPercentUsed float, Status int ) Set @intErrorCode = @@Error End

10:

-- get log space info. for all databases If @intErrorCode = 0 Begin Insert Into #DBLogSpace Exec ('DBCC SQLPERF (LogSpace)') set @intErrorCode = @@Error end -- get percent for specified database if @intErrorCode = 0 begin select @fltPercentUsed = LogPercentUsed from #DBLogSpace where dbname = @chvDbName set @intErrorCode = @@Error end drop table #DBLogSpace return @intErrorCode

You can test this stored procedure from Query Analyzer, as shown on Figure 10-7. These techniques were extremely important before SQL Server 2000. It is now possible to use the table datatype as a return value for user-defined functions. We showed how can you use table-valued user-defined functions in 9. Unfortunately, it is (still) not possible to use a table variable as the output parameter of a stored procedure. You have another option when you want to pass a resultset (or multiple resultsets) to a calling stored procedure. You can use the cursor datatype as the output parameter of a stored procedure. In the following example, prGetInventoryProperties_CursorGet creates

This operation is not something that you should perform very often. It could be problematic if you were to do it on a production server. SQL Server contains a procedure cache a part of the memory where it keeps compiled versions of stored procedures. You should flush the procedure cache to force all dependent stored procedures (which refer to the stored procedure by its old name) to recompile. You can use DBCC FREEPROCCACHE, or you can simply restart SQL Server and the procedure cache will be emptied.

Figure 10-7.

and opens a cursor. It is then returned as a cursor output parameter to the calling procedure:

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