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Most recompilations are required either for statement correctness or to obtain potentially faster query execution plans. In previous versions of SQL Server, whenever a statement within a batch causes recompilation, the whole batch, whether submitted through a stored procedure, trigger, ad-hoc batch, or prepared statement, is recompiled. In SQL Server 2005, only the statement inside the batch that causes recompilation is recompiled. Because of this difference, recompilation counts in SQL Server 2000 and SQL Server 2005 are not comparable. Also, there are more types of recompilations in SQL Server 2005 because of its expanded feature set. Statement-level recompilation benefits performance because, in most cases, a small number of statements causes recompilations and their associated penalties, in terms of CPU time and locks. These penalties are therefore avoided for the other statements in the batch that do not have to be recompiled. The SQL Server Profiler SP:Recompile trace event reports statement-level recompilations in SQL Server 2005. This trace event reports only batch recompilations in previous versions and can lead to confusion if not examined closely. Also, in SQL Server 2005, the TextData column of this event is populated so that more information is returned by the trace. SQL Server 2005 also adds a new trace event called SQL:StmtRecompile that reports statement-level recompilations. This trace event can be used to track and debug recompilations. Whereas SP:Recompile generates only for stored procedures and triggers, SQL:StmtRecompile generates for stored procedures, triggers, ad-hoc batches, batches that are executed by using sp_executesql, prepared queries, and dynamic SQL.

The merge engine provides a powerful and resilient engine for distributing changes because it was designed for mobile, disconnected users. The design specifications to handle mobile, disconnected users can be applied in a server-to-server environment because the merge engine is already coded to handle significant amounts of downtime and unpredictable data synchroniza tion. The change tracking occurs in a set of metadata tables that are within the same database that is being published or subscribed. Because both publisher and subscriber maintain a complete copy of all changes that were made, the merge engine can make one simple request during each cycle: Send me everything that I do not already have.

One of the disk drives in the software RAID-5 array might have failed. Several SSIS packages that you have configured to run on the server are not executing. Another volume might be experiencing I/O errors.

The following profiler trace events are relevant for observing and debugging plan caching, compilation, and recompilation behaviors:

You can use the following questions to test your knowledge of the information in Les son 3, Merge Replication. The questions are also available on the companion CD if you prefer to review them in electronic form.

Answers to these questions and explanations of why each answer choice is right or wrong are located in the Answers section at the end of the book.

Cursors: CursorRecompile. Useful for observing recompilations caused by cursorrelated batches. Objects: Auto Stats. Useful for observing the statistics updates caused by SQL Server s auto-stats feature. Performance: Show Plan All For Query Compile. Useful for tracing batch compilations. It does not distinguish between a compilation and a recompilation. It produces showplan data in textual format Performance: Show Plan XML For Query Compile. Useful for tracing batch compilations. It does not distinguish between a compilation and a recompilation. It produces showplan data in XML format Stored Procedures: SP:Recompile. Useful for detecting when a recompilation occurs.

1. Consolidated Messenger distributes packages between businesses in down town New York. Orders are received at the central office, and messengers on inline skates receive pickup and delivery instructions through their Pocket PC powered devices that use merge replication to synchronize data. When pack ages are received and delivered, the messenger collects a signature from the cus tomer that triggers an update to the order record. Global positioning system (GPS) devices carried in the messengers backpacks continuously transmit

Answer the following questions: 1. What evidence would be present if one of the disk drives in the RAID-5 array had failed 2. What is the likely cause of the backup jobs and SSIS packages not executing 3. What evidence would be present if there were I/O errors on a disk or volume

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