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SQL Server Clustering takes much longer to fail over than database mirroring does, because it has to start SQL Server on the new node when you fail over With database mirroring, you would be able to perform the same routine maintenance with either one or two 15 30-second failovers (if the mirroring state is SYNCHRONIZED and there is no REDO queue on the mirror), depending on whether you had equivalent hardware on both sides of the mirror How would you do this Before you start, you should confirm that you have valid failover partner information in all of your application connection strings You would also want to defer index maintenance that was scheduled during this time frame, because you don t want extra transaction log activity Then you would apply the Windows update to the server where the mirror copy of the database was running, and reboot the server.

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After the server comes back up and the SQL Server is restarted, you can watch in Database Mirroring Monitor, until the database(s) are again fully synchronized Depending on your hardware and workload, this might take awhile After the database(s) are synchronized, you would manually fail over from the principal to the mirror (thereby swapping their roles) This will usually take less than a minute depending on your workload and hardware During this relatively short time, your applications will be unavailable, but after the mirroring roles are switched, your applications will automatically reconnect (with no user intervention), assuming the failover partner information is correct in the connection strings, and the application has been coded to reconnect after a failure If you have multiple mirrored.

Helical A helical antenna is a circularly polarized, high-gain, unidirectional antenna A typical helical antenna is shown in Fig 27-12 The reflector diameter should be at least 08 at the lowest operating frequency The radius of the helix should be approximately 017 at the center of the intended operating frequency range The longitudinal spacing between helix turns should be approximately 025 in the center of the operating frequency range The overall length of the helix should be at least at the lowest operating frequency A helical antenna can provide about 15 dBd forward gain Helical antennas are sometimes used in space communications systems Corner Reflector A corner reflector, employed with a /2 dipole driven element, is illustrated in Fig 27-13 This provides some gain over a /2 dipole by itself The reflector is made of wire mesh, screen, or sheet metal The flare angle of the reflecting element is approximately 90 Corner reflectors are widely used in terrestrial communications at UHF and microwave frequencies Several /2 dipoles can be fed in phase and placed along a common axis with a single, elongated reflector, forming a collinear corner reflector array Horn The horn antenna is shaped like a squared-off trumpet or trombone horn It provides a unidirectional radiation and response pattern, with the favored direction coincident with the opening of the horn The feed line is a waveguide that joins the antenna at the narrowest point (throat) of the horn

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databases on that server, you would manually fail over each of those databases Finally, you could apply the Windows update to the original principal server, which now has the mirror database(s), and then allow it to restart If your hardware is equivalent on both sides, you could run on the normal mirror side until the next time you needed to do some maintenance (assuming you have a SQL license) If not, you can wait for the mirror to become synchronized, and then failover again to be back on the original server Either way, database mirroring can give you much less downtime (seconds instead of minutes) than any other method If you do not have equivalent hardware and I/O capacity on both sides of the mirror, you can use a variation on this strategy.