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database server is only as secure as the operating system (OS) on which it is run Even the strongest security measures for an installation of SQL Server can be compromised by sloppy network policies and settings In this chapter, we ll look at some general best practices for securing the Windows NT and Windows 2000 machines in your environment Before we get into the technical details of dealing with security on the Windows NT/2000 operating systems, it s important to consider some basic concepts Far too often, systems administrators start implementing security measures without considering exactly what it is that they re protecting against Before making any policy or setting changes, it s important that you answer a few questions regarding needs that are specific to your environment.

By referring to the syntax, you should be able to construct an SQL statement that creates database objects or modifies SQL data as necessary. However, in order to better demonstrate how the syntax is applied, each chapter also contains examples of actual SQL statements.

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Order of search predicates Does the order of the predicates in the WHERE clause have any in uence on the order in which the predicates are evaluated Ideally, the most restrictive predicate (the one that eliminates the most number of rows) should be evaluated rst Lack of statistics If a cost-based optimizer is being used, what does it do when statistics have not been collected for one or more tables Some optimizers, such as Oracle s, revert back to rule-based, while others assume default values for the required statistics or simply refuse to use any indexes and do full table scans of all the tables A full table scan is where the DBMS reads every row in the table to nd the desired ones, which of course can be a performance disaster for tables with very large numbers of rows..

The basic unit of data management in the SQL environment. A table is made up of columns and rows and is analogous to a relation (with its attributes and tuples) in relational theory. Each column is associated with a data type and holds values that are somehow related to each other. For example, a table about customers would contain columns that contain data about those customers, such as their names and addresses. (See 3.) A virtual table that is created when the view is invoked (by calling its name). The table doesn t actually exist only the SQL statement that defines the table is stored in the database. When that statement is invoked, the view pulls data from base tables and displays the results as if you re viewing the results of a base table query. (See 5.) A user-defined object that can be specified in place of a data type when defining a column (a process part of creating or altering a table definition). A domain is based on an SQL data type but can include a default value and a constraint, which further limits the values that can be stored in a particular column. (See 4.)

In many cases, it s much too easy to create security policies without paying attention to what the policies really mean and how they ll affect your business environment In this chapter, we ll look at some questions to answer before implementing a policy I strongly recommend that you read the General IT Best Practices section presented in 2, if you haven t done so already That section outlines the security requirements and general steps that are vital to protecting your information There are many ways in which technology can help protect information Network operating systems, such as Windows NT and the Windows 2000 platform, provide many features that, when employed properly, can help prevent potential problems In this chapter, we ll focus on the technical aspects of how you can implement some of these best practices.

User-defined type (UDT)

Query rewrites Are queries rewritten into more ef cient forms by the optimizer For example, many optimizers automatically rewrite subselects into equivalent joins in order to simplify subsequent processing. In some cases, you may nd that certain DBMS options must be enabled in order to allow the optimizer to rewrite queries. View de nition merges For queries that use views, at what point does the DBMS merge the view de nition (the query that de nes the view) into the SQL statement submitted by the database user This has obvious implications for the optimizer the sooner it can evaluate the entire SQL statement, the smarter its decision should be. Other criteria What other criteria in uence the optimizer For example, some optimizers will favor unique indexes over nonunique ones, and some will favor the use of an index to sequence rows over sorting the result set.

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