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Setting auditing is important, but it is useless if the audit logs are not regularly reviewed for suspicious activity. The activity logs can contain a lot of information, making it difficult to find exactly what you re looking for. To find a specific event, do the following: 1. Select Tools | Manage Server Messages.
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2. In the Message Text Contains box, you can type in text you re searching for. You can also enter a specific error number and/or specify a certain severity. 3. Click Find to start the search. Server messages are also written to the Windows NT Application Log, and can be viewed using the Event Viewer application. Sometimes, you just want to get a quick snapshot of who s using the server and for what purpose. You can view current database activity by selecting Management | Current Activity | Process Info in Enterprise Manager. From this view, shown in Figure 4-14, you can find out which users are logged in to the database server, what operations are being performed, and which objects are currently locked. There are options to send a message to a connected user and to kill a specific process (if you have permissions).
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When dealing with database security, fitting the settings to your business requirements should be of the utmost concern. In dealing with SQL Server 7 settings, the following measures are recommended: w By default, the password for the sa account is blank. The first and most important configuration setting you should change after installing the product is this password. The Windows NT Administrators group is automatically given the same permissions as the SA account. The default TCP/IP port used by SQL Server is 1433. Potential hackers will often scan for this port to find out which SQL Servers are running in your environment. Though this isn t a security breach in itself, finding the SQL Server installations in your environment may be the first step toward a hack attempt (especially on the Internet). You should make the password for the SQL Server service accounts very difficult to guess. You ll rarely need to use this account to log in, and if you do, any administrator can always change the password.
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PERFORMANCE MONITORING AND OPTIMIZATION
Performance can be monitored and optimized at multiple levels. The goal is to provide low response times (how long it takes to receive the first records from a query) and high throughput (how quickly an entire result set can be returned). When discussing performance monitoring as related to database applications, it s important to make a distinction between these terms. Furthermore, optimization steps can often cause the balance between throughput and response times to tip in favor of one or the other. To find the optimal settings, you must understand business requirements. For example, if a user wants to scroll through a list of items, it is a good idea to return the first few items as quickly as possible. However, if a manager is creating a report on a desktop computer, it s likely that none of the calculations will be completed until all data is retrieved. Overall database performance is based on the relationship between many different factors. You can optimize performance at one or more of several levels: w s v Server level Performance issues related to running multiple applications on the same machine Database level Managing database objects to offer the best response times and throughput Query level Finding and optimizing long-running database queries
In this section, we ll look at the tools and features available for monitoring and optimizing performance.
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The Server Level
The first step in optimizing performance is to look at the overall configuration of the SQL Server. Included at this level will be considerations regarding other roles of this machine and the implementation of important resources. The three most important hardware-level parameters that affect a database server are the CPU, memory, and physical disk decisions. In this section, we ll look at how you can monitor and optimize these settings.
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