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If your budget will not allow you to buy sufficient hardware and I/O capacity for the mirror, you can run database mirroring in high-performance mode (asynchronous) during normal operations That way, your principal database is not slowed down waiting on your mirror hardware and I/O subsystem during times of peak workload In high-safety mode (synchronous), transactions are not committed on the principal until they have been sent to the mirror, committed there, and then acknowledged back to the principal When it comes time for routine maintenance, you follow nearly the same sequence of steps, with a few key changes You apply the Windows Update and reboot the mirror server, and you wait for the mirror to get synchronized again On the principal side, you switch from highperformance to high-safety mode, which is a quick and easy change.

Horns are sometimes used all by themselves, but they are also used to feed large dish antennas This optimizes the f/s ratio by minimizing extraneous radiation and response that occurs if a dipole is used as the driven element for the dish

set userFile to choose file of type "publictext" with prompt "Choose the text file you want to open:" default location (path to the Documents folder) without invisibles

You should once again confirm that the database is fully synchronized, which might take awhile, and then failover the database from the principal to the mirror The failover usually takes less than a minute After the roles are switched, go to the new principal, and quickly switch back to high-performance mode Next, you apply the Windows update to the original principal server and allow it to reboot Then you wait for the database to get fully synchronized and then switch back to high-safety mode and fail over that database back to the original server Finally, you switch back to high-performance mode, and you are done, with two relatively quick failovers One drawback to running normally in high-performance mode is that you lose your automatic failover capability, which requires high-safety mode, with a witness It also makes it more difficult to quickly recover from losing the principal database.

dialog box opens, as shown in Figure 8-22

If you ever permanently lost the principal database (due to a catastrophic hardware failure, for example), you could break the mirroring partnership and recover the orphaned mirror by running the commands below:.

Antennas should never be placed in such a way that they can fall or blow down on power lines Also, it should not be possible for power lines to fall or blow down on an antenna Wireless equipment having outdoor antennas should not be used during thundershowers, or when lightning is anywhere in the vicinity Antenna construction and maintenance should never be undertaken when lightning is visible or thunder can be heard, even if a storm appears to be many miles away Ideally, antennas should be disconnected from electronic equipment, and connected to a substantial earth ground, at all times when the equipment is not in use Tower and antenna climbing is a job for professionals Under no circumstances should an inexperienced person attempt to climb such a structure Indoor transmitting antennas can expose operating personnel to EM field energy The extent of the hazard, if any, posed by such exposure has not been firmly established However, there is sufficient concern to warrant checking the latest publications on the topic For detailed information concerning antenna safety, consult a professional antenna engineer and/or a comprehensive text on antenna design and construction

-- Remove the mirror ALTER DATABASE yourdatabase SET PARTNER OFF -- Restore the database on the mirror side RESTORE DATABASE yourdatabase WITH RECOVERY

(continued)

You could always restore from your regular SQL Server backup set. This could take quite awhile, during which time your application(s) will be down. If the database(s) had a mirroring state of SYNCHRONIZED when the failure occurred, you could be back up and running much more quickly on the broken mirror, with no data loss.

Refer to the text in this chapter if necessary A good score is at least 18 correct Answers are in the back of the book 1 Imagine a center-fed, straight wire antenna in free space, whose length can be varied at will At which of the following lengths is the radiation resistance at the feed point the highest (a) /4 (b)

Using database mirroring to become a superhero!

Figure 8-22 The Choose A File dialog box appears with your custom prompt and showing the contents of the Documents folder