TAILIEUCHUNG - Microsoft SQL Server 2008 R2 Unleashed- P79

Microsoft SQL Server 2008 R2 Unleashed- P79:SQL Server 2005 provided a number of significant new features and enhancements over what was available in SQL Server 2000. This is not too surprising considering there was a five-year gap between these major SQL Server 2008 is not as much of a quantum leap forward from SQL Server 2005 | 724 CHAPTER 23 Creating and Managing Databases FIGURE Database options in SSMS. is false because this option can cause performance problems related to the timing of the shrink operation in a production database. Because the operation is automatic it can run at any time including times when there may be heavy production load. The Page Verify option in the Recovery category was enhanced in SQL Server 2005. That enhancement came in the form of a new CHECKSUM option. This CHECKSUM option is the default it causes a checksum calculation to occur across the entire database page. Prior to the availability of the CHECKSUM option page verification was done with TORN_PAGE_DETECTION. Both of these options help detect damaged database pages but CHECKSUM is the method that Microsoft recommends. The CHECKSUM calculation can be complicated but it basically tells SQL Server to calculate a number based on the contents of each data index page. The CHECKSUM value is stored in the page header when it is written to disk. When the page is read from the disk the checksum is computed again and compared to the value in page header to help ensure that the contents of each page are valid. Database Read-Only and Restrict Access are two other commonly used options in the State category. You can set Database Read-Only to true to prevent updates from occurring in the database. Databases used for reference and not updated are perfect candidates for this option. The Restrict Access options are handy when you re executing system maintenance or mass updates in which you want to restrict users from accessing the database. Single User allows only one user to access the database. The Restricted option allows only members of db_owner dbcreator and sysadmin to access the database. With the Download from Setting Database Options 725 Restricted option there is no limit on the number of users in these groups that can access the database. You can easily set up the options reviewed in .

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