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One valid objection that you may hear regarding database mirroring is that it is only available at the user database level; therefore, it does not include things like logins and SQL Agent jobs. This is easy enough to correct with a little preparation. You should try hard to use Windows Authentication instead of SQL Server Authentication for your logins, and then create the same Windows logins on the mirror instance. This will avoid the possibility of orphaned users that you can get with SQL Server Authentication. If you must use SQL Server Authentication, you can create the SQL Server logins on the mirror instance with the same SID as on the principal instance, which will also avoid the orphaned users issue. The queries in listing 1 show how to create a SQL Server login with an identical SID on the mirror instance.

Directivity Plots Antenna radiation and response patterns are represented by plots such as those shown in Fig 27-6 The location of the antenna is assumed to be at the center (or origin) of a polar coordinate system The

-- Get the SID for an existing login SELECT [name], sid FROM sys.server_principals WHERE type_desc = 'SQL_LOGIN' -- Create SQL Server login with a specific SID --(to avoid orphaned user problem) CREATE LOGIN yourloginname WITH PASSWORD = 'yourpassword', sid = 0xA306A5DFBF321A4D98D71520DAE1C1D3, CHECK_POLICY = OFF

8:

You can script SQL Agent jobs out on the principal, and then create them on the mirror ahead of time, keeping them disabled on the mirror until you need them. However, ensuring that the SQL Agent jobs are maintained on the mirror will require some discipline. Job changes are migrated over time. You should make sure that both sides of the mirroring partnership are properly configured for SQL Server 2008, depending on your type of workload. For both online transaction processing (OLTP) and decision support system (DSS) types of workloads, I would grant the Lock Pages in Memory and Perform Volume Maintenance Tasks rights to the SQL Server Service Account. Prior to SQL Server 2008 SP1 CU2 (Build 2714), the Lock Pages in Memory right worked only with the Enterprise Edition of SQL Server 2005/2008. The Perform Volume Maintenance Tasks right is necessary for the Windows Instant File Initialization feature to work. This allows SQL Server to allocate file space for data files (during database creation, file grows, and database restores), without zeroing out the file first. This can pose a small security risk, but I think the benefit far outweighs the risk. Database restores are much quicker with Windows Instant File Initialization enabled. This is important when you are trying to establish a mirror on a busy production database. You should also set instance level options with sp_configure for things like max server memory (MB), max degree of parallelism, optimize for ad hoc workloads, clr enabled, and backup compression default to appropriate values depending on your workload type. Max degree of parallelism is usually set to 1 for OLTP workloads and half the number of processor cores for DSS workloads. Optimize for ad hoc workloads

greater the radiation or reception capability of the antenna in a certain direction, the farther from the center the points on the chart are plotted A dipole antenna, oriented horizontally so that its conductor runs in a north-south direction, has a horizontal plane (or H plane) pattern similar to that in Fig 27-6A The elevation plane (or E plane) pattern depends on the height of the antenna above effective ground at the viewing angle With the dipole oriented so that its conductor runs perpendicular to the page, and the antenna 1 4 wavelength above effective ground, the E plane antenna pattern for a half-wave dipole resembles the graph shown at B

Table 8-2

and backup compression default should both be enabled in most cases. If you have any .NET CLR assemblies in the database that you want to mirror, you need to make sure that clr enabled is set to 1 on the SQL Server instance where the mirror database will live.