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Creating Databases and Database Snapshots
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master, msalb, model, resource database, tempdb, SQL Server executables
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Figure 10-12 Simple application workload database layout.
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Scenario: In this scenario the user has a moderately complex application that utilizes a backend SQL Server 2005 database as a data repository for the entire application. The maximum database size is estimated to be 35 GB with a fairly even split between read and write type transactions. While the read transactions access the entire database, the write activity is primarily targeted to a single large CaseLog table which is heavily inserted into. The application has a high transactions/second throughput with a mix of very simple transactions that are executed in high volumes as well as large complex queries that involve multiple table joins and sort operations that are executed less frequently. The user has 28 disk drives available for the database and would like to maximize performance while protecting the database against single disk failures. Solution: A mirrored (RAID-1) disk is created (C) and used to store the master, msdb, model, and resource databases as well as the SQL Server executables. This addresses the user s requirement for protection against single disk failures for the system database and executables. Since the application has a sizable amount of write activity, the database transaction log is created on a RAID-10 disk (L) utilizing six disk drives. Given the size of the database and the presence of large complex T-SQL queries that could possibly utilize tempdb, the tempdb database is created with eight data files on a six-drive RAID-10 disk (T). The remaining 14 drives are split into two RAID-10 disks with eight drives (D) and six drives (E). D is used to store the primary filegroup consisting of the primary data file (data.mdf) as well as filegroup FG1 which contains a single secondary data file. FG1, with the single secondary data file (data1.ndf), is created primarily for manageability purposes given the size of the database and the need to be able to move the data around at a later time. All the database tables, except the CaseLog table, are stored on this disk
Part III
Microsoft SQL Server Administration
(D). The E drive holds filegroup FG2, which consists of a single secondary data file (data2.ndf), and is used to store the CaseLog table. Separating the CaseLog table out into its own filegroup helps keep the heavy write activity from interfering with the read activity on the other database tables. This is particularly important given that the application executes a high transaction per second. The final database layout along with the filegroup and data file details is shown in Figures 10-13.
RAID-1 (2 disks) master, msdb, model, resource database, tempdb, SQL senser executables
RAID-10 (8 disks)
Primary filegroup (data.mdf) FG1 (data1.ndf)
RAID-10 (6 disks)
FG2 (data2.ndf)
RAID-10 (6 disks)
Logs
RAID-10 (6 disks)
tempdb
Figure 10-13 Moderately complex application workload database layout.
Complex Application Workload
Scenario: In this scenario the user has a complex application that utilizes a backend SQL Server 2005 database to store all its data and metadata. The maximum database size is projected to be 100 GB with a growth of 10 percent every year. The application is characterized by a wide range of transaction types. The usual online transaction processing workload executes relatively light, primarily read type transactions on the database throughout the day. In addition, there is also a set of heavy-duty batch jobs that are executed every 12 hours. These batch jobs execute some very complex queries, involving multiple table joins and perform a large number of insert and delete operations. The user has a 42 disk drives available for the database and would like the database to perform
10
Creating Databases and Database Snapshots
well for both online and batch workloads, be highly available and protected against single disk failures. Solution: A mirrored (RAID-1) disk is created (C) and used to store the master, msdb, model, and resource databases as well as the SQL Server executables. This addresses the user s requirement for protection against single disk failures for the system database and executables. Since the batch jobs perform large amounts of inserts and deletes, the database transaction log is created on dedicated RAID-10 disk (L) utilizing eight disk drives. Given the size of the database and the presence of large complex queries that could possibly utilize tempdb to hold the results of operations that cannot be held in memory, tempdb is created on a RAID-10 disk (T) with another eight drives. The remaining 24 drives are configured as a single RAID-10 disk (D) and used to store the primary filegroup consisting of the primary data file (Data.mdf) and filegroup FG1, containing a single secondary data file (Data2.ndf) that is created for manageability purposes. This database layout is chosen because of the wide variations in the application database s usage characteristics. The reason for having just one large 24-disk stripe is that both the online transaction processing and the batch workloads that execute only once in a while can benefit from all of the disks. There will undoubtedly be some interference when the online and batch workloads execute concurrently, but this should be far outweighed by the extra disk drives available to both types of workloads. The final database layout along with the filegroup and data file details is shown in Figures 10-14.
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