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It s very rare for a user database to have allocation contention. Therefore, splitting a database into multiple files is primarily done to enable the use of filegroups (covered later in the chapter) and/or for manageability reasons. MANAGEABILITY Consider a database configured with a single file stored on a 1TB disk partition with the database file currently 900GB. A migration project requires the database to be moved to a new server that has been allocated three 500GB drives. Obviously the 900GB file won t fit into any of the three new drives. There are various ways of addressing this problem, but avoiding it by using multiple smaller files is arguably the easiest. In a similar manner, multiple smaller files enable additional flexibility in overcoming a number of other storage-related issues. For example, if a disk drive is approaching capacity, it s much easier (and quicker) to detach a database and move one or two smaller files than it is to move a single large file. TRANSACTION LOG As we ve covered earlier, transaction log files are written to in a sequential manner. Although it s possible to create more than one transaction log file per database, there s no benefit in doing so. Some DBAs create multiple transaction log files in a futile attempt at increasing performance. Transaction log performance is obtained through other strategies we ve already covered, such as using dedicated disk volumes, implementing faster disks, using a RAID 10 volume, and ensuring the disk controller has sufficient write cache. For both transaction logs and data files, sizing the files correctly is crucial in avoiding disk fragmentation and poor performance.

One of the major benefits of SQL Server is that it offers multiple features that enable databases to continue running with very little administrative effort, but such features often come with downsides. One such feature, as shown in figure 9.2, is the Enable Autogrowth option, which enables a database file to automatically expand when full.

Figure 9.2 Despite the lower administration overhead, the Enable Autogrowth option should not be used in place of database presizing and proactive maintenance routines.

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The problem with the autogrowth feature is that every time the file grows, all activity on the file is suspended until the growth operation is complete If enabled, instant initialization (covered shortly) reduces the time required for such actions, but clearly the better alternative is to initialize the database files with an appropriate size before the database begins to be used Doing so not only avoids autogrowth operations but also reduces disk fragmentation Consider a worst case scenario: a database is created with all of the default settings The file size and autogrowth properties will be inherited from the model database, which by default has a 3MB data file set to autogrow in 1MB increments and a 1MB log file with 10 percent autogrowth increments.

If the database is subjected to a heavy workload, autogrowth increments will occur every time the file is increased by 1MB, which could be many times per second Worse, the transaction log increases by 10 percent per autogrowth; after many autogrowth operations, the transaction log will be increasing by large amounts for each autogrowth, a problem exacerbated by the fact that transaction logs can t use instant initialization In addition to appropriate presizing, part of a proactive database maintenance routine should be regular inspections of space usage within a database and transaction log By observing growth patterns, the files can be manually expanded by an appropriate size ahead of autogrowth operations Despite the negative aspects of autogrowth, it s useful in handling unexpected surges in growth that can otherwise result in out-of-space errors and subsequent downtime.

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The best use of this feature is for emergencies only, and not as a replacement for adequate presizing and proactive maintenance Further, the autogrowth amounts should be set to appropriate amounts; for example, setting a database to autogrow in 1MB increments isn t appropriate for a database that grows by 10GB per day Given its unique nature, presizing database files is of particular importance for the tempdb database TEMPDB The tempdb database, used for the temporary storage of various objects, is unique in that it s re-created each time SQL Server starts Unless tempdb s file sizes are manually altered, the database will be re-created with default (very small) file sizes each time SQL Server is restarted.

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