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By using a minimally logged operation, SQL Server doesn t have to work as hard as if the operation was fully logged. The result is that your import will be much faster, and also that your log file could be a fraction of the size of a fully logged operation. Before we start, we first need to understand what a minimally logged operation is. A minimally logged operation logs only the pages and extents that are affected; a fully logged operation will log all the individual insert, update, and delete statements. If you have 100 insert statements in a fully logged operation, you d have 100 entries in the log file, whereas if it were minimally logged, you d only have one entry. A minimally logged bulk copy can be performed if all of these conditions are met: The recovery model is simple or bulk-logged. The target table isn t being replicated. The target table doesn t have any triggers. The target table either has zero rows or doesn t have indexes. The TABLOCK hint is specified. In this chapter, I m going to concentrate on the TABLOCK hint (used to obtain a shared lock on a table which is held until the end of a T-SQL statement) and how it can be used to increase performance. I ll show you that performance will greatly increase when you specify the TABLOCK hint.

Three kinds of locks can be acquired on a table. The lowest-level lock is a row lock: this will only lock one row. A coarser-grain lock is the page lock, which will lock all the data on a page. Finally, a table lock will lock the whole table. Only when you

As you no doubt well know, e-mail is probably Entourage s most widely used feature even people who shirk tasks and appointments tend to send and receive messages This section explains the message object that forms the basis of both outgoing messages and incoming messages, and then shows you how to use AppleScript to make Entourage send and receive messages

Tom DeMark has been involved in the investment business for over 40 years Upon graduation with a BA and MBA and after law school, DeMark went to work for one of the fastest-growing investment counseling firms He became president of a consulting subsidiary that sold market-timing services to many of the largest and most successful funds and trusts in the country For the past 17 years DeMark has been special advisor to Steve Cohen, principal of SAC Capital DeMark is also president of Market Studies LLC, a supplier of market-timing services to Bloomberg, Thomson Reuters, CQG, and, recently, DeMark Prime DeMark has written three bestselling books and is a speaker at many worldwide investment forums and seminars Additionally, he regularly appears on financial networks WHAT S NEXT

specify a table lock in your bulk insert statement can you have a minimally logged operation. SQL Server has three recovery models: Full, Simple, and Bulk-Logged. Simple Recovery Simple Recovery uses the least amount of log space, and you can only restore to the most recent full database or differential backup. Full Recovery Full Recovery uses the most log space and gives you full recoverability of data, because you can use backups as well as transaction logs to restore to a point in time. Bulk-Logged Recovery Bulk Logged Recovery is similar to the Full Recovery model, but offers no point-in-time recovery for bulk operations. Bulk operations would have to be redone. To show you how the recovery model and the TABLOCK hint affect the size of the log, we will create six databases: two databases per recovery level. For each recovery level, we will run the bulk insert with and without the TABLOCK hint. Start by executing the scripts in listing 1, which will create our six databases.

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CREATE DATABASE TestRecoverySimple GO ALTER DATABASE TestRecoverySimple SET RECOVERY SIMPLE GO CREATE DATABASE TestRecoverySimpleLock GO ALTER DATABASE TestRecoverySimpleLock SET RECOVERY SIMPLE GO CREATE DATABASE TestRecoveryBulk GO ALTER DATABASE TestRecoveryBulk SET RECOVERY BULK_LOGGED GO CREATE DATABASE TestRecoveryBulkLock GO ALTER DATABASE TestRecoveryBulkLock SET RECOVERY BULK_LOGGED GO CREATE DATABASE TestRecoveryFull GO ALTER DATABASE TestRecoveryFull SET RECOVERY FULL GO

In the next chapter, I ll provide you with lots of useful resources including where to get help, an indicator summary, charts, books, and stock discussion groups