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Gather business and regulatory requirements. Decide how requirements will affect choices at various security levels. Evaluate costs and benefits of security choices. Decide on appropriate security recommendations. Inform business decision-makers about security recommendations and their impact. Incorporate feedback from business decision-makers into a design. Decide which authentication system to use. Ascertain the impact of authentication on a high-availability solution. Establish the consumption of enterprise authentication. Ascertain the impact of enterprise authentication on service uptime requirements.

Lessons in this chapter:

If data that has been changed by an open transaction is accessed by another transaction, a dirty read has taken place. A dirty read can cause problems because it means that a data manipulation language (DML) statement accessed data that logically does not exist yet or will never exist (if the open transaction is rolled back). All isolation levels except for read uncommitted protect against dirty reads.

Lesson 1: Assessing Database Security Needs for Business . . . . . . . . . . . . . . . . 95 Lesson 2: Overview of SQL Server Security . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103

Members can perform all configuration and maintenance activities on the database. Members can modify role membership and manage

If a specific set of data is accessed more than once in the same transaction (such as when two different queries against the same table use the same WHERE clause) and the rows accessed between these accesses are updated or deleted by another transaction, a non-repeatable read has taken place. That is, if two queries against the same table with the same WHERE clause are executed in the same transaction, they return different results. The repeatable read, serializable, and snapshot isolation levels protect a transaction from non-repeatable reads.

3

SQL Server 2005 installed. A connection to a SQL Server 2005 instance in Microsoft SQL Server Manage ment Studio (SSMS). The AdventureWorks database installed.

Phantom reads are a variation of non-repeatable reads. A phantom read is when two queries in the same transaction, against the same table, use the same WHERE clause, and the query executed last returns more rows than the first query. Only the serializable and snapshot isolation levels protect a transaction from phantom reads.

One of the organizations that we recently worked with had a monolithic environ ment configured. A single machine housed the development, test, and produc tion environments. In addition, it held the function of a file server, source code repository, and general dumping ground for everything else imaginable. Every one had full administrator privileges on the machine, and all applications were configured to log in with accounts that had sysadmin authority. On top of these severe security holes, this particular organization had experienced a significant amount of personnel turnover, and no one was managing the server properly. To secure the machine, over a three-month time period we gradually eliminated hundreds of accounts, within both Windows and SQL Server, which belonged to people who were no longer with the organization. Administrative access was then removed from each of the accounts that applications used to log in to the server. Taking these steps enabled us to remove hundreds of attack vectors for hackers and ensure that very sensitive personal data was better secured. When we left the project, the client had an environment that was significantly more secure and that protected the highly sensitive personal information that was being stored in the databases. The bottom line is that security is a require ment, not an afterthought. A properly designed security infrastructure ensures that everyone in an organization can perform their tasks while it allows only authorized access to data.

permissions. In addition, every database user belongs to the public database role. When a user account has not been specifically granted or denied permissions, it inherits the permissions granted to the public database role.

These are advanced RAID configurations, but you quickly learn about a problem in terminology when using these. You can ask for a RAID 1+0 configuration, but you might get different configu rations, depending upon the hardware vendor. That is why we recommend always using the words to describe the configuration you expect. Instead of specifying RAID 0+1, you should ask for a mir ror of stripes configuration. Instead of specifying RAID 1+0 or RAID 10, you should ask for a stripe of mirrors configuration.