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Computer hardware today is increasingly diverse, and it is very difficult to develop applications that exploit the hardware for performance and scalability. It wasn t that long ago that computers with multiple CPUs were rare and used only in sophisticated business environments. Today, multiple CPU cores are commonplace, and features such as Symmetric Multi Processing (SMP) are often present in household systems. Manufacturers continue to find ways around the limitations of their hardware platforms and build these solutions into new systems at astonishing rates. For example, it has been generally accepted that 4 GB of RAM is the upper limit of supportable memory for 32-bit CPUs, but that hasn t stopped innovators from pushing for more. Using Non-Uniform Memory Architecture (NUMA) is becoming a standard method to enable support of more than 4 GB of RAM. Some processor manufacturers have built CPU architectures that support cache-coherent or CC-NUMA architectures that enable utilizing large amounts of memory and cache for the CPU, making NUMA available on even low-end systems. Larger enterprise computer systems with as many as 64 CPUs and 512 GB or more memory are becoming more common today. As the number of CPUs within a machine increases, hardware manufacturers are beginning to standardize on CC-NUMA architectures.

ALTER DATABASE AdventureWorks SET PARTNER OFF;

1. How do you fail back from a forced failover 2. Which server objects are your primary concern in the event of a failover

Modern computer systems generally have more than one system bus, each serving a set of processors (or processor cores). Each set of processors has its own memory, known as local memory, and might have its own input/output (I/O) channels as well. This is known as a NUMA group. Each group can access memory associated with the other groups as well. Memory associated with other groups is known as foreign memory (or remote memory). The ratio of the cost of accessing foreign memory to the cost of accessing local memory is called the NUMA ratio. The higher the NUMA ratio, the slower the access to the memory. The main benefit of NUMA is scalability. The NUMA architecture was designed to surpass the scalability limits of SMP architectures. With SMP, all memory access is located on the same memory bus. This works fine for a relatively low number of processors, but not when you have several (more than 16) cores competing for access to the shared memory bus. NUMA alleviates these bottlenecks by limiting the number of CPUs on any one memory bus and connecting the various nodes with a high-speed bus. SQL Server 2005 has been designed to fully support NUMA and CC-NUMA architectures without special configuration. Generally speaking, this is true for systems with 16 cores or fewer. When dealing with systems that have more than 16 cores, special care must be taken to configure SQL Server 2005 to most efficiently utilize the NUMA architecture.

1. If the partners were synchronized at the time of the failover, you can apply transaction log backups to roll the failed partner forward in time, and then Database Mirroring will finish the resynchronization process. If the part ners were not synchronized at the time of the failover, you need to remove mirroring and reinitialize. 2. The instance containing the mirror database must also have all the logins present that are required for applications and users to connect to the data base. If the applications use linked servers, they also need to exist to pre vent application failures. Other server objects, such as SSIS packages and jobs, are not as critical during the failover and can generally be addressed shortly after a failover (after all applications are online).

6. Access the DTA output when the analysis completes. Figure 2-13 shows the Progress tab. The results you obtain vary depending upon the workload file you specify, and the DTA does not make recommendations unless significant improvements can be made.

In this exercise, you will failover the mirroring session that was implemented in the previous exercise. 1. Open a new query window, connect to INSTP, and execute the following code:

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ALTER DATABASE AdventureWorks SET PARTNER FAILOVER;

Exercise 2: Connect Using SQL Native Client In this exercise, you will connect to the same instance of SQL Server, but this time, you will use the SQL Native Client provider. You will do this using ADO, which will require you to add a reference to the MDAC library.

The SET PARTNER FAILOVER option is available only if the mirroring session is synchronized, is oper ating in High Availability mode, and is executed from the principal. To force a failover for either the High Performance or High Protection operating modes or when the principal is unavailable, you need to execute the ALTER DATABASE AdventureWorks SET PARTNER FORCE_SERVICE_ALLOW_DATA_LOSS; command.

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Database Mirroring can take care of the failover from the principal to the mirror, automatically promotes the mirror and demotes the failed partner, and can even perform an automatic incremental resynchronization in some cases. However, this capability is wasted unless you are ensuring that logins, linked servers, and other supporting objects are present on the mirror at the time of failover. A failback should be done only if dictated by company policy or if performance is degraded following a failover.