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-- Basic info about mirrored databases SELECT DB_NAME(database_id) AS 'database_name', * FROM sys.database_mirroring WHERE database_id > 4 -- eliminate system databases AND mirroring_state != NULL -- Check mirroring endpoints SELECT * FROM sys.database_mirroring_endpoints -- Check witness status SELECT * FROM sys.database_mirroring_witnesses -- Check mirroring connections SELECT * FROM sys.dm_db_mirroring_connections -- Check auto page repair history (SQL 2008 only) SELECT DB_NAME(database_id) AS 'database_name', * FROM sys.dm_db_mirroring_auto_page_repair

alias "Server:Docs:2010 Business Plan - roughdoc"

End-Fire Array A typical end-fire array consists of two parallel /2 dipoles fed 90 out of phase and spaced /4 apart (Fig 27-8A) This produces a unidirectional radiation pattern Or, the two elements can be driven in phase and spaced at a separation of (Fig 27-8B) This results in a bidirectional radiation pattern In the phasing system, the branches of the transmission line must be cut to precisely the correct lengths, and the velocity factor of the line must be known and be taken into account

You should not rely on the status message in the Object Explorer tree in SSMS to tell you the status of your database mirror, because it does not auto refresh. If you do not manually refresh the database status in Object Explorer, you will never know the true status of the database mirroring session. This will give you a false sense of security and well-being, because the status might say Principal, Synchronized, even if the true status is something else like Principal, Suspended (unless you manually refresh it). Perhaps a future version of SQL Server will have a feature that would let you configure SSMS to let it automatically refresh this status periodically. In the meantime, you can use Database Mirroring Monitor to configure alerts that can automatically notify you about the status of your database mirror. You can also query sys.databases and check the log_reuse_wait_desc column to see if the description is DATABASE_ MIRRORING (which tells you that mirroring has a problem), as you see below:

When you re dealing with a single file, often the easiest way of dealing with it is to assign the file to a variable, as in the Keynote example you saw earlier in this chapter:

If a problem with your database mirroring session is preventing the transaction log from being truncated internally when you take a transaction log backup, the transaction log on the principal database will start to fill up and eventually grow (if auto-grow is enabled) This is usually caused by a communications problem or a REDO queue on the mirror One final tip about establishing your first database mirroring session on a production server is to try creating a small test database on the principal for a trial run on that server Create an empty database running FULL recovery model, then take a full backup and log backup (even though it is empty, with no activity) Then restore the full backup and log backup, with no recovery Finally, create the endpoints and alter the database to create the mirror.

Longwire A wire antenna measuring or more, and fed at a high-current point or at one end, is a longwire antenna A longwire antenna offers gain over a half-wave dipole As the wire is made longer, the main lobes get more nearly in line with the antenna, and their amplitudes increase The gain is a function of the length of the antenna; the longer the wire, the greater the gain A longwire antenna must be as straight as possible for proper operation Broadside Array Figure 27-9 shows the geometric arrangement of a broadside array The driven elements can each consist of a single radiator, as shown in the figure, or they can consist of more complex antennas with directive properties In any case, all the elements are identical If a reflecting screen is placed behind the array of dipoles in Fig 27-9, the system is known as a billboard antenna The directional properties depend on the number of elements, whether or not the elements have gain themselves, and on the spacing among the elements In general, the larger the number of elements, the greater the forward gain, and the greater the f/b and f/s ratios