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Waits are delays caused when a process or worker thread cannot immediately access the resources it requires because of excessive activity or inadequate resources. Resource waits occur when a worker thread requests access to a resource that is not available. Examples of resource waits are locks, latches, network, and disk I/O waits. Lock and latch waits are waits on synchronization objects. Queue waits occur when a worker thread is idle, waiting for work to be assigned. You most typically see queue waits with system background tasks such as the deadlock monitor. External waits occur when a worker thread is waiting for an external event, such as an extended stored procedure call or a linked server query, to finish. When you diagnose blocking issues, remember that external waits do not always imply that the worker is idle, because the worker might actively be running some external code. The SQLServer:Wait Statistics performance object contains performance counters that report information about wait status. This object provides the following counters:

Very few administrators limit the number of user connections to a shared folder, but it can be done. On the certification exam, be aware that limits to the number of user connections might prevent a user from accessing a shared folder. The type of message that a user receives indicates that the server cannot accept connections. Note that Windows XP Professional and Windows 2000 Professional systems cannot accept more than 10 concurrent user connections.

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Occasionally, a server must be taken offline for maintenance, backups must be run, or other tasks must be performed that require users to be disconnected and any open files to be closed and unlocked. Each of these scenarios will use the Shared Folders snap-in. The Sessions node of the Shared Folders snap-in allows you to monitor the number of users connected to a particular server and, if necessary, to disconnect the user. The Open Files node enumerates a list of all open files and file locks for a single server and allows you to close one open file or disconnect all open files.

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Lock Waits Log Buffer Waits Log Write Waits Memory Grant Queue Waits Network IO Waits Non-Page Latch Waits Page IO Latch Waits Page Latch Waits

To install the Recovery Console, insert the Windows Server 2003 CD-ROM and type cd-drive:\i386\winnt32 /cmdcons on the command line. The Setup Wizard will install the 8-MB console in a hidden folder called Cmdcons and will modify the boot.ini file to provide the Recovery Console as a startup option during the boot process.

If you ever decide to remove the Recovery Console, you must delete files and folders that are super hidden. From Windows Explorer, choose the Folder Options command from the Tools menu. Click the View tab, select Show Hidden Files and Folders, clear Hide Protected Operating System Files, click OK and, if you are prompted with a warning about displaying protected system files, click Yes. Then, delete the Cmdcons folder and the Cmldr file, each of which are located in the root of the system drive. You must next remove the Recovery Console startup option from Boot.ini. Open System from Control Panel, click the Advanced tab, click the Settings button in the Startup And Recovery frame, and then, in the Startup And Recovery dialog box, under System startup, select Edit. Boot.ini will display in Notepad. Remove the entry for the Recovery Console, which will look something like this:

After you have installed the Recovery Console, you can boot the system and select Microsoft Windows Recovery Console from the startup menu. If the console was not installed or cannot be launched successfully, you can restart using the Windows Server 2003 CD-ROM and, at the Welcome To Setup screen, press R to select Repair. The loading takes significantly longer from the CD-ROM, but the resulting Recovery Console is identical to that installed on the local system. Once the Recovery Console has started, as shown in Figure 13-3, you will be prompted to select the installation of Windows to which you wish to log on. You will then be asked to enter the Administrator password. You must use the password assigned to the local Administrator account, which, on a domain controller, is the password configured on the Directory Services Restore Mode Password page of the Active Directory Installation Wizard.

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You can use the following questions to test your knowledge of the information in Lesson 2, Making Implicit Constraints Explicit. The questions are also available on the companion CD if you prefer to review them in electronic form.

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