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Ground-Mounted Vertical The simplest vertical antenna is a /4 radiator mounted at ground level The radiator is fed with a coaxial cable The center conductor is connected to the base of the radiator, and the shield is connected to a ground system Unless an extensive ground radial system is installed, a ground-mounted vertical is likely to be inefficient unless the surface happens to be an excellent conductor (saltwater or a salt marsh, for example) Another problem is the fact that vertically polarized antennas receive more human-made noise than horizontal antennas In addition, the EM fields from ground-mounted transmitting antennas are more likely to cause interference to nearby electronic devices than are the EM fields from antennas installed at a height Ground Plane A ground-plane antenna is a vertical radiator, usually measuring /4, operated against a system of /4 conductors called radials The feed point, where the feed line joins the antenna radiator and the hub of the radial system, is elevated When the feed point is at least /4 above the ground, only three or four radials are necessary to obtain a low-loss RF ground system The radials extend outward from the base of the antenna at an angle between 0 and 45 with respect to the horizon Figure 27-3A illustrates a typical ground-plane antenna with four horizontal radials A ground-plane antenna should be fed with coaxial cable The feed-point impedance of a ground-plane antenna having a /2 radiator is about 37 if the radials are horizontal; the impedance increases as the radials droop, reaching about 50 at a droop angle of 45

Greg Linwood is the Managing Director of MyDBA a dedicated SQL Server support business and also Australian Director of SQLskills, a specialist provider of SQL Server training. Greg has worked in a range of developer and DBA capacities with SQL Server since 1993, and was the first Australian to receive Microsoft s SQL Server MVP award in 2003. He has gained significant expertise in SQL Server tuning, and most of his professional time is currently spent tuning customer SQL Server systems. Greg is passionate about building high-quality SQL Server community events in Australia, and is one of the founders of the Australian SQL Server User Group, leading the Melbourne SQL Server User Group.

34 Using database mirroring to become a superhero!

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Coaxial Antenna The radials in a ground-plane antenna can extend straight downward, and then can be merged to form a /2 cylinder or sleeve that is concentric with the feed line In this case, the feed-point impedance is approximately 73 This is known as a coaxial antenna (Fig 27-3B)

This chapter covers how to use database mirroring not only to increase availability in the traditional sense, but also for less common situations that are not typically mentioned in the SQL Server documentation or literature. One example is using database mirroring to seamlessly upgrade from SQL Server 2005 to SQL Server 2008 with a 10 15-second outage. Another example is using database mirroring to move multiple terabytes of data from one storage system to another with a 10 15-second outage. This chapter reveals these secret techniques.

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SQL Server 2005 introduced database mirroring, and SQL Server 2008 enhanced it. Back in the pre-SQL Server 2005 days, you had several choices for high availability solutions with SQL Server, including failover clustering, log shipping, and replica-

Any receiving or transmitting antenna, consisting of one or more turns of wire forming a dc short circuit, comprises a loop antenna

tion. In many situations, database mirroring offers key advantages over all older technologies. It is simple to set up and administer, it offers fast automatic failover, it works at the database level (rather than at the instance or table level), and it can be used with commodity-level hardware. Database mirroring offers fast failover (usually much faster than failover clustering), and automatic failover (unlike log shipping or replication). It also avoids the single point of failure that you have with the shared storage in failover clustering. In addition, it is much easier to administer than failover clustering (where adding and removing drives can be pretty painful, for example).

Table 8-2

If you are unfamiliar with how database mirroring works, here is a quick primer. You have one user database, which must be running with the FULL recovery model, which is called the principal. The principal is available for client connections, and does most of the work. You also have a complete, synchronized copy of