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Hopefully, I m preaching to the choir when I talk about the importance of backing up the system state of your Windows servers. Protecting the information that s stored on your network servers, including the Active Directory database, is quite simply the most important thing you can do as a part of your disaster recovery planning. Provisioning for spare network hardware is useful as a time-saving mechanism and to prevent extended outages. Network and server hardware, though, is relatively simple to replace: in a worst-case scenario, you can simply take the CFO s credit card and go buy a new machine from your local electronics superstore to keep you up and running while your production hardware is repaired or replaced. Your network data cannot be replaced quite so easily, and your Active Directory data can be just as important as your data files. If you can t restore Active Directory from a backup, you ll be faced with the unpleasant task of re-creating user and group information from scratch. This is not only a long and laborious process, but it also creates a potential security risk, since you can t really be sure that you reconfigured everything correctly from memory. This can create lingering access and security problems that might not show themselves for weeks or even months after an outage. Because of this, your Active Directory database should be included in your nightly backups of critical network data.

Once the web services have been configured and started, you can then log into the web portal from a client computer or from the server. To do so, open Safari from a client computer, and enter the address of the web server followed by /ical. For example, if the server is caldav.krypted.com, the address to use to connect to the calendars, enter http://caldav.krypted.com/ical into Safari s address bar. When the page loads, you will be prompted to authenticate. Enter a username and password for a user who has calendars configured (configuring calendars for specific users is explained in further detail later in this chapter), and click the OK button. The calendar will then load and should appear similar the one shown in Figure 10 8.

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In addition to being read-only, the following additional restrictions apply to table-valued parameters: As with table variables, you cannot use a table-valued parameter as the target of a SET or SELECT assignment statement. Table-valued parameters are scoped just like other parameters and local variables declared within a procedure or function. They are not visible outside of the procedure in which they are declared. SQL Server does not maintain column-level statistics for table-valued parameters, which can affect performance if you are passing large numbers of rows of data via table-valued parameters. You can also pass table-valued parameters to SPs from ADO.NET clients, which I will discuss in 15.

In addition to normal SPs, T-SQL provides what are known as temporary SPs. Temporary SPs are created just like any other SPs; the only difference is that the name must begin with a number sign (#) for a local temporary SP and two number signs (##) for a global temporary SP. While a normal SP remains in the database and schema it was created in until it is explicitly dropped via the DROP PROCEDURE statement, temporary SPs are dropped automatically. A local temporary SP is visible only to the current session and is dropped when the current session ends. A global temporary SP is visible to all connections and is automatically dropped when the last session using it ends. Normally you won t use temporary SPs, as they are usually used for specialized solutions like database drivers. Open Database Connectivity (ODBC) drivers, for instance, make use of temporary SPs to implement SQL Server connectivity functions.

Caution Just like backups for your other critical network data, you should maintain copies of your Active Directory backups in an offsite location in case of a natural disaster or other mishap.

Provided that the calendar loads appropriately in the web portal, the wiki services have successfully been integrated.

SQL Server has several features that work behind the scenes to optimize your SP performance. , The first time you execute an SP SQL Server compiles it into a query plan, which it then caches. This compilation process invokes a certain amount of overhead, which can be substantial for procedures that are complex or that are run very often. SQL Server uses a complex , caching mechanism to store and reuse query plans on subsequent calls to the same SP in an effort to minimize the impact of SP compilation overhead. In this section, I ll talk about managing query plan recompilation and cached query plan reuse.

iCal can send e-mail invitations for calendar events. If you wish to configure this and the mail services are running on the same server as your iCal services, you will have little more to do than check the Enable Email Invitations box shown in the Configuring iCal Server section earlier in this chapter.

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