5.6. DATABASE LAYOUT FOR PERFORMANCE AND RESTORABILITY
This section explains how to improve disk layout for performance and restorability.
When CREATE DATABASE is executed with no location specified, the default is to place all database files (data files, xxx.MDF, log files, xxx.LDF, and backup files, xxx.bak) on the same physical disk. That's because SQL Server doesn't know anything about your disk configuration or your preferences. But such a configuration gives poor performance, especially for an OLTP database, and it precludes complete recovery from data disk failure. Poor performance and poor restorability are very bad for a production database.
Placing data, index, log and backup files on the same disk, as in the default layout, has the ...
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