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Secure disk backup directories appropriately, particularly backups made from unencrypted databases If virus-scanning software is installed on the SQL Server, exclude database files (MDF, NDF, LDF, and BAK files) from the scan, and if running on a cluster, ensure the quorum disk (usually Q:) is completely excluded Ensure the stability and performance impact of any virus-scanning software is measured in a load test environment before introduction into a production environment, and ensure the software is cluster aware before use in a cluster Secure SQL Servers in locations that prevent physical access to the general public and unauthorized staff Delete FTP utility executables from SQL Servers unless required.

Database ownership chaining should be disabled (which is the default setting) to prevent cases in which a user can create an object with a specific owner in a database in which he is the database owner for the explicit purpose of accessing objects in another database with the same owner Without the ownership chain in effect, the user would be denied access to those objects in the other database Stay up to date with security notification, service packs, and hotfixes The Microsoft website provides links to various resources for this purpose, including an RSS feed, email, instant messaging, and mobile device notification Where possible, create linked servers that preserve the calling user s security context Do so by selecting the Be made using the logins current security context option in the Security page of the Linked Server properties dialog.

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a mine the yield per unit cost for a particular ore is declining according to Y = 8 - 042 where the yield is in millions of tons per year and t is in years Find the time for the mine to produce 60 million tons of ore

For servers not supporting this option, consider the security ramifications of a user s privileges being potentially elevated when made in another security context Additional information on the best practices covered in this chapter can be found online at http://wwwsqlCrunchcom/security The focus of this chapter was configuration from a security perspective In the next chapter, we ll examine configuration from a performance and stability perspective..

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Before we continue, let s cover some of the restrictions of database mirroring:

Unlike transaction log shipping, which supports the Bulk_Logged recovery model, database mirroring only works for databases using the full recovery model. The mirror database can t be read unless you create a database snapshot against it. We covered database snapshots in the previous chapter. Depending on the environment and mirroring mode, a snapshot may introduce an unacceptable performance overhead. Mirroring is set up for individual databases in other words, you can t mirror at an instance level. While you can individually mirror more than one database within an instance, there are special considerations when mirroring databases with interdependencies, a topic we ll cover later in this chapter. System databases (master, model, msdb, and tempdb) can t be mirrored.

Solution: Be carem with rate statements like this one The yield equation is in millions of tons per year, not millions of tons total Since the yield is in millions of tons per year, the time for 60 million tons has to come from an internon over time Integration is required rather than multiplication because the rate per year is changing The total yield then is

You can have only one mirror database for each principal, unlike log shipping where logs from a source database can be shipped to multiple destinations. However, the one database can be both log shipped and mirrored. Databases involved in cross-database or distributed transactions aren t supported in database mirroring. We ll explore this restriction in more detail later in the chapter. As covered in chapter 9, database mirroring can t be enabled on databases containing FileStream data.

With that brief introduction in mind, let s move on and discuss the two major types of database mirroring modes: asynchronous (high performance) and synchronous (high safety).

Notice that in this problem the limits are 0 and t because we are looking for the time to produce a total of 60 (million tons) Therefore set T = 60 in the equation

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