Microsoft SQL Server 2008 Administration for Oracle DBAs in Visual Studio .NET

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Microsoft SQL Server 2008 Administration for Oracle DBAs
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Automatic Page Repair
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A new feature for SQL Server 2008, automatic page repair will try to fix corrupt pages automatically between a pair of mirrored databases When a page corruption error is encountered on the principal database (by a user attempting to read the data), details of the corrupt page are written to the suspect_pages table in the msdb database The principal then requests a copy of the page from the mirror and restores it automatically If the page corruption is detected on the mirror, then mirroring will be suspended until the corrupt page is successfully copied again from the principal, after which mirroring will automatically resume You can use the sysdm_db_mirroring_auto_page_repair DMV to track pages that were repaired automatically
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The last warm standby solution is SQL Server Replication, which is comparable to Oracle Streams or Data Guard with SQL Apply Replication is particularly useful where there is a requirement to duplicate data and handle write requests from multiple locations Peer-to-peer replication fits this requirement nicely and allows for multiple copies of the data to be made and writes to be handled from all copies The process of committing a transaction on one server and it being replicated to another server is asynchronous; therefore, it is not suitable for zero data loss requirements, and has no automatic failure detection or failover so is considered to be a warm standby solution You can read more about replication and peer-to-peer replication topologies in 11
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Although replication can form part of an HA/DR solution, it is mainly used for building data distribution architectures, such as a head office distributing product data to its many stores, or road warriors with laptops containing subsets of customer data synchronizing back to the main database when they are online Introducing replication can in some cases, depending on the setup, require changes to the actual database schema, such as ensuring tables have primary keys and so forth Therefore, it requires greater consideration than the other HA/DR solutions
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Hot standby solutions have built-in failure detection and automatic failover with no manual interaction required They are used in business and mission-critical systems where the RTO is very short and the RPO is very small In Oracle, this is normally
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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
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when technologies such as RAC or Data Guard operating in maximum protection and maximum availability modes would be used
Failover Clustering
Failover clustering has been around since Windows NT 40 and SQL Server 7, and although the implementation of it has changed significantly over the years, the underlying concept and technology should be considered mature Failover clustering is a service provided by the Windows Server platform, and SQL Server is able to be installed in such a way that it utilizes the failover capabilities of the platform This feature is widely used and aims to provide redundancy at the server level in the same way that multiple power supplies (for example) provide redundancy at the component level The basic architecture consists of two or more servers (called nodes) connected to a shared disk array, such as a SAN that contains the data for an application (which in our case are the database files and logs for SQL Server) If the server that is running SQL Server experiences an outage, another node in the cluster will take control of the disks, start the SQL Server service, and everything is back up and running again It is important to note that failover clustering uses a shared disk architecture, but that only one node is running the SQL Server instance and has control of the associated disk resources at any one time Figure 9-5 illustrates this basic design
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