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Listing 1 Script to create a login with identical SID on the mirror instance
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-- 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
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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
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How do you prepare the mirror
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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.
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How do you prepare the mirror
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Finally, after all of the preliminary configuration work, you are ready to prepare the mirror for database mirroring. If possible, you should try to do this during non-peak hours, and you should also consider deferring normal index maintenance tasks while you are trying to establish the mirror, so that log-intensive operations are minimized as much as possible. This will make it much easier to establish the mirror. To prepare the mirror, you need to take a full database backup of the user database that you want to mirror (which must be running in FULL recovery model). Using backup compression, whether it is SQL Server native backup compression or a solution from a third party, is highly recommended in this situation, because it will make the backup file(s) much smaller, and it will allow the full backup to complete much more quickly. When the full backup is complete, you will need to copy the database backup to the mirror instance. Speed is of the essence here, because your full backup is falling behind the live database each second during this process. If you are using a modern SAN on your principal instance, you may be able to snap the backup drive(s) over to the mirror host nearly instantaneously. Otherwise, you will have to copy the backup file(s) over your network to the mirror host, which may take quite a bit of time. If both servers are running Windows Server 2008, network copy time can be reduced courtesy of the improvements in Server Message Block 2.0. If the backup file(s) are compressed, that will obviously reduce the copy and restore time even further. After the backup file(s) are available on the mirror host, you should restore the database with the NORECOVERY option. This is important. If you restore with RECOVERY (which is the default for both the SQL Server Management Studio (SSMS) GUI and T-SQL), you will not be able to establish the mirror, and you will have to restore all over again. You should always script out the restore, to double-check it, and you should change the progress update setting to 1 percent, so that you can get a better estimate of how long the restore will take. Depending on the size and activity level of your database, and your hardware and network infrastructure, this full backup, copy, and restore sequence could take several hours. You can dramatically reduce this time frame by having a robust I/O subsystem, using backup compression, making sure the mirror instance SQL Server Service account has the Perform Volume Maintenance Tasks right, and using Windows Server 2008. Again, depending on your level of write activity on the principal and the time elapsed for the full backup, copy, and restore sequence, you will probably have taken one or more transaction log backups on the principal during this period. You should also use backup compression here if possible. Each of these backup files should be copied over to the mirror instance, where they need to be restored with NORECOVERY,
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in sequence. Depending on how long the full backup took, some of the initial transaction log backup restores will be skipped when you try to restore them, because their log sequence numbers will be included in the full backup. With SQL Server 2008, you must back up and restore at least one log backup; otherwise you will not be able to establish the mirror. For example, if your full backup, copy, and restore took six hours, your mirror will be about six hours behind the principal after the full restore is finished. You will usually find that the transaction log restores go relatively quickly, and you will start to rapidly catch up to the principal. If you are taking hourly transaction log backups on the principal, you will typically see the restore take a few minutes (depending on several factors, mainly I/O capacity on the mirror), which will allow you to eventually catch up to the principal. It is important to try to catch up as much as possible, because SQL Server will refuse to establish the mirror if it is too far behind the principal. After you are caught up as closely as possible, you need to create the mirroring endpoints and issue the appropriate ALTER DATABASE commands to establish the mirror. The database mirroring wizard in SQL Server Management Studio (SSMS) works well enough for this, but beware that it will want to start the mirroring session in high-safety mode (synchronous) by default, which I do not recommend. You can also use T-SQL to do this. In most cases, you should start database mirroring in highperformance mode (asynchronous), to make sure that the performance of the principal is not negatively affected by the mirror trying to get fully synchronized. The SSMS tool called Database Mirroring Monitor, which was introduced with SQL Server 2005 SP1, makes it much easier to watch what is going on as the databases get synchronized. You can also watch some database mirroring specific counters in Performance Monitor (under SQL Server: Database Mirroring), and you can run some system catalog and Dynamic Management View (DMV) queries to monitor database mirroring. Some of these are shown in listing 2.
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