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If this book teaches you nothing else, you ve learned that together the GCC compilers offer approximately 13 zillion options Trying to find the absolute best set of GCC options to use for a specific application and architecture can be tedious at best; so most people stick with the standard GCC optimization options, invoking selected others they have found to be useful over time This is something of a shame because it overlooks additional optimization possibilities; but your development time has to be optimized, too Scott Ladd s Acovea application (http://wwwcoyotegulchcom/products/acovea/indexhtml) provides an interesting and useful mechanism for deriving optimal sets of optimization switches, using an evolutionary algorithm that emulates natural selection Lest this sound like voodoo, let s think about how optimization works in the first place.

Blocking occurs when one transaction in a database session is locking resources that one or more other session transactions wants to read or modify. Short term blocking is usually OK, depending on your application requirements. However, poorly designed applications can cause long term blocking, unnecessarily keeping locks on resources and blocking other sessions from reading or updating them. In SQL Server 2005, a blocked process remains blocked indefinitely or until it times-out (based on SET LOCK_TIMEOUT), the server goes down, the process is killed, the connection finishes its updates, or something happens to the original transaction to cause it to release its locks on the resource. Some reasons why long term blocking can happen: Without proper indexing, blocking issues can grow. Excessive row locks on a table without an index can cause SQL Server to acquire a table lock, blocking out other transactions. Applications that open a transaction then request user feedback or interaction while the transaction stays open. This is usually when an end user is allowed to enter data in a GUI while a transaction remains open. While open, any resources referenced by the transaction may be held with locks. Transactions that BEGIN and then look up data that could have been referenced prior to the transaction starting. Queries that use locking hints inappropriately, for example if the application uses only a few rows, but uses a table lock hint instead (for a review of locking hints, see 1, SELECT, in the recipe Use Table Hints, which include a list of the available locking hints). The application uses long-running transactions that update many rows or many tables within one transaction (chunking large updates into smaller update transactions can help improve concurrency).

In this recipe, I ll demonstrate how to identify a blocking process, view the Transact-SQL being executed by the process, and then forcefully shut down the active sessions connection (thus rolling back any open work not yet committed by the blocking session). First, however, let s go to a quick background on the commands used in this example... This recipe demonstrates how to identify blocking processes with the new SQL Server 2005 dynamic management view, sys.dm_os_waiting_tasks. This view is intended to be used instead of the sp_who system stored procedure, which was used in previous versions of SQL Server. After identifying the blocking process, this recipe will then use DBCC INPUTBUFFER to view the query that is being executed and then as a last resort, forcefully end the process. The syntax for DBCC INPUTBUFFER is as follows: DBCC INPUTBUFFER ( session_id [ , request_id ] ) [WITH NO_INFOMSGS ]

Optimization applies algorithms that potentially improve various code segments; checks the results; and retains those that result in code improvements This is conceptually akin to the first step of the natural selection process Acovea simply automates the propagation of satisfactory optimizations to subsequent optimization passes, which apply additional optimizations and measure the results Optimizations that do not indeed optimize or improve the code are therefore treated as evolutionary dead ends that are not explored GCC experts, random posts on the Internet, and books such as this one all offer a variety of general suggestions for trying to derive the best optimizations Unfortunately, these can be contradictory and can never take into account the content and structure of your specific application Acovea attempts to address this by enabling the exhaustive, automatic analysis of the performance of applications compiled with an iterative set of optimization options.

The arguments for this command are described in Table 3-7: Table 3-7. DBCC INPUTBUFFER Command Arguments

Its exhaustive analysis also enables you to empirically derive information about the most elusive aspect of GCC s optimization options their interaction Invoking one promising optimization option may have significant impact on the performance of other optimization options Acovea enables you to automatically test all configured GCC options in combination with each other, helping you locate the holy grails of application development, the smallest or fastest compiled version of your application..

The session id associated with the active database connection. The batch to identify within the session. When included in the command, WITH NO_INFOMSGS suppresses informational messages from the DBCC output.