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You can use the Transact-SQL CREATE XML INDEX statement to create secondary XML indexes and specify their type. All indexing options that apply to a nonclustered index, except IGNORE_DUP_KEY and ONLINE, are permitted on secondary XML indexes. These two options must always be set to OFF for secondary XML indexes. You can query the sys.xml_indexes catalog view to retrieve XML index information. The secondary_type_desc column in the sys.xml_indexes catalog view provides the type of secondary index. The values returned in the secondary_type_desc column can be NULL, PATH, VALUE, or PROPERTY. For a primary XML index, the value returned is NULL.

in effect, it enabled SQL Server to control Windows resources such as thread allocations. This worked very well on the hardware of the day, and the UMS concept was carried forward into SQL Server 2000. Unfortunately, as hardware became more sophisticated, the limitations of the UMS became apparent.

A forced failover occurs when the principal fails while the mirroring session is in an unsynchronized state, causing transactions that were committed on the principal to become lost. This situation is possible only for the High Performance and High Pro tection operating modes. Failover for High Performance and High Protection operating modes is manual. You must execute the following command from the mirror to cause the session to fail over:

ALTER DATABASE AdventureWorks SET PARTNER FORCE_SERVICE_ALLOW_DATA_LOSS;

The heart of any computer system, the central processing unit (CPU or processor ), is the hardware component that is responsible for executing tasks. To execute tasks, the processor utilizes a unit of work known as a thread. If a program is written to be multithreaded, it can split itself into two or more simultaneously running tasks. Multiple threads can be executed in parallel on many computer systems. This multithreading generally occurs by time slicing, wherein a single processor switches between different threads, which means the processing only appears to be simultaneous. On a machine with multiple processors (or processor cores ), threading can be achieved via multiprocessing, which means that different threads can literally execute simultaneously on different cores. Windows supports the use of threads as well as a technique known as fiber mode scheduling, which is also known as lightweight pooling. Fibers are scheduled by the application itself and run in the context of a thread, enabling multiprocessing.

As is readily apparent from the ALTER DATABASE option, a forcible failover can cause transactions to be lost. This situation can create a gap in the LSN sequence between the two partners in the mirroring session. If the failed partner contains transactions that are not present on the principal (former mirror), Database Mirroring cannot resynchronize the failed partner. If the failed partner cannot be resynchronized, you must remove the mirroring session and reinitialize mirroring for the database. You can remove a mirroring session by executing the following command:

Partitioning makes large tables or indexes more manageable because it lets you manage and access subsets of data quickly and efficiently while maintaining the integrity of a data collection. Maintenance operations on subsets of data are also performed more efficiently because they target only the data that is required.