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A common pattern for log shipping with multiple destinations is to have multiple destinations that operate with a different time lag; for example, you may log ship to two destinations, with site A only 15 minutes behind the main database as the primary DR site Site B then may have a delay of six hours or greater for the secondary DR point This way, if a corruption such as a large amount of data being deleted or incorrectly updated goes unnoticed before the change makes its way to the primary DR site, you have a greater chance of catching it before it is applied to the secondary DR, giving you options to switch to another database while you resolve the problem
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Database mirroring is a feature that was introduced in SQL Server 2005 SP1 and can be thought of as similar to Oracle Data Guard with Redo Apply Using a similar approach to Data Guard, database mirroring operates by streaming and reapplying transaction log records from the primary (principle) database to the secondary database (mirror) Just like Data Guard, database mirroring has different modes of operation: High-performance mode Two SQL Server instances are required, and data synchronization between the principal and mirror databases is executed asynchronously to minimize the overhead High-safety mode without automatic failover Two SQL Server instances are required, and replication between the principal and mirror databases is executed synchronously to guarantee no data loss This mode is usually just a temporary state when the ability to automatically fail over is lost due to the loss of a third server, known as the witness
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High-safety mode with automatic failover Three SQL Server instances are required, and replication between the principal and mirror databases is executed synchronously to guarantee no data loss The third server, the witness, is required to enable automatic failover See the section Hot Standby Solutions for more details on this mode of operation Database mirroring in high-performance mode is comparable to Data Guard operating in its maximum performance mode and is considered to be a warm standby solution because it requires manual intervention to initiate failover and client redirection It is only available with the Enterprise and Datacenter editions of SQL Server Figure 9-3 helps to illustrate the basic concept With SQL Server 2008 and the introduction of compression into many areas of the product, the log records that are copied across to the mirror are automatically compressed, which uses less network bandwidth and enables faster processing of log records
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Like log shipping, the destination database can also be used for reporting purposes, but this is achieved slightly differently from log shipping To be able to read a mirrored database, you need to take a database snapshot (database snapshots were covered in 2), which is a read-only, point-in-time view of the mirror database, and then read from the snapshot The advantage to this is that you can take multiple snapshots of the database at different times and continue to use them without affecting the mirroring process or having to disconnect all your users Figure 9-4 shows a topology in which multiple snapshots have been taken on a mirrored database for reporting purposes
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Principal database
Mirror database
Figure 9-3
Asynchronous database mirroring basic topology
C h a p te r 9 : H i g h Ava i l a b i l i t y a n d D i s a s te r R e cove r y
Reporting user
Reporting user
Snapshot 1 at 9 am Compressed log stream Snapshot 2 at 12 pm Reporting user
Principal database
Mirror database
Snapshot 3 at 6 pm
Reporting user
Reporting user
Figure 9-4
Reporting on a database mirror
Oracle DBA Q&A
Q: Is it possible to mirror one database to multiple destinations like in Data Guard A: It is not possible to have multiple mirror destinations, but you can mix technologies together to achieve a similar approach For example, you could use database mirroring to mirror the AdventureWorks database from Server A to Server B and then use log shipping to create one or more additional copies on Servers C, D, and E, etc
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