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With the addition of a new product catalog, the Web site is experiencing stability issues. Customers are prevented from purchasing products or services at various times during the day when changes are being made to the underlying data. The company has just fired the consulting firm responsible for developing and man aging the Web site and all other applications within the company because of a failure to provide any availability for business-critical systems.

The newly hired CTO has been tasked with implementing high availability for all busi ness-critical systems. The CTO has just hired a DBA and system administrator to assist in this task as well as manage the day-to-day operations.

Implementing a successful scale-out technique involves consideration of all potential solutions. It is possible that you might need to implement a combination of one or more techniques to accomplish your goal. This section presents techniques that can be used to target multiple servers and thus scale out your application.

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There are 11 databases within the environment, as shown in Table 7-1.

A Distributed Partition View (DPV) is a technique in which data partitioned horizontally across multiple servers is joined together to make it appear as if it comes from one table The data is partitioned by a key value from each table For example, the Product ID column could be used to partition the product tables in the AdventureWorks database The goal of a DPV is to transparently distribute the load of a database application across multiple servers This is different from the partition we created earlier, in which a table was assigned to multiple filegroups on the same server In the case of a DPV, the data is partitioned across two or more servers To create a DPV, you will first need to horizontally partition your table or tables.

Table 7-1

Purpose Stores all orders placed by customers. Stores all personal information related to a customer. Stores customer credit card information. Stores information related to all employees. Stores all HR documents as well as employee salaries. Stores the products that can be purchased on the Web site. Stores the flights that have been booked by customers. Stores the cruises that have been booked by customers. Stores the excursions that have been booked by customers. An excursion is defined as something that is not a flight, cruise, product, or car rental. Stores the car rentals that have been booked by customers. A utility database, currently empty, for use by DBAs.

The considerations that apply to this task are the same as those discussed in the section of this chapter titled Specifying a Data-Partitioning Model Once the data has been moved to its respective servers, you will need to utilize check constraints to ensure the range of values for each partition For example, assume we want to create three partitions for the PersonContact table in the AdventureWorks database The partitions will reside on three separate servers named ServerA, ServerB, and ServerC The PersonContact table contains 19,972 records If this table is partitioned on the column ContactID, we can split it so that 6,657 records reside in the partition on ServerA, 6,657 records in the partition on ServerB, and 6,658 records in the partition on ServerC (6,657 + 6,657 + 6,658 = 19,972).

Figure 2-6

The environment has a single Web server named WEB1, along with a single database server named SQL1. All servers are running on Windows 2003 Server, and SQL1 is running SQL Server 2005 Service Pack 1 Standard Edition. SQL1 has an external storage cabinet connected to a RAID controller with a battery backup that is capable of implementing RAID 0, RAID 1, and RAID 5. The entire array is currently configured as a single RAID 0 set. The current storage is at only 10 percent capacity. A tape drive is connected to both WEB1 and SQL1, but the tape drives have never been used. SQL1 and WEB1 are currently located in the cubicle adjacent to the previously fired consultant.

An interim solution needs to be deployed that does not add technology. Longer-range planning that is not budgeted will take place at a later date after the current environ ment is stabilized, analyzed, and documented.