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New in SQL Server 2005, an execution context can be specified for code. Specifying an execution context enables code to be run under a specific security context. The execution context that can be defined is shown in Table 6-2.

Durability After a transaction has completed, its effects are permanently in place in the system The modifications persist even in the event of a system failure Point in Time Point in Time is generally used to refer to the ability to restore a database to a specified point in time due to a hardware or software failure Stable Media Stable media is often confused with physical storage SQL Server defines stable media as storage that can survive system restart or common failure Many highend disk subsystems provide high-speed cache facilities to reduce the latency of read and write operations This cache is often supported by a battery-powered backup facility The battery backup provides the necessary power to maintain the data in the cache for several days, but implementations vary by manufacturer Manufacturers can switch out batteries to increase the life of the cache when necessary.

The Log File Viewer allows you to view log files from a variety of sources. The default log view depends on how you open the Log File Viewer. If you open the Log File Viewer by double-clicking a log from the SQL Server Logs folder, under the Management folder in SQL Server Management Studio (SSMS), the SQL Server Logs will be in focus. If you open it by double-clicking a log from the Error Logs folder of SQL Server Agent, the SQL Server Logs view is what you will see. You can view different logs by selecting them in the Select Logs pane as shown in Figure 3-1. It is possible to view logs from Database Mail, SQL Agent, SQL Server, and Windows NT in the Log File Viewer. The database server also writes messages to the Application event log, which you can view using Event Viewer. Although this might seem redundant given the functionality of the Log File Viewer, it allows a server administrator who does not have any rights to the database to view specific errors related to the database. It also allows you to perform diagnoses on servers that are functional only via Emergency Management Services (EMS). If enabled, EMS enables you to connect to and diagnose problems with a computer that might have no network connectivity or that has a problem with its video card.

Table 6-2

The key is that after the system problem has been corrected, the pending writes in the cache are treated as if the failure or restart never occurred Most manufacturers implementations immediately flush pending writes to physical disk during the restart operations Write Ordering Write ordering (or write dependency) is the capability of the I/O subsystem to preserve the order of I/O operations As described previously, stable media can include caching If a point in time is studied, the stable media should reveal preserved I/O order characteristics The order of the I/O operations associated with SQL Server must be maintained The system must maintain write ordering, or it breaks the WAL protocol described in this appendix (The log records must be written out in correct order and the log records must always be written to stable media before the data pages that the log records represent are written.

Description Default behavior. Similar to SQL Server 2000 execution context, in which the permissions of the user are evaluated based on the permissions granted by the schema owner.

6

) After a transaction log record is successfully flushed, the associated data page can then be flushed as well If the subsystem permits the data page to reach stable media before the log record does, data integrity is breached..

For an extensive list of errors generated by the database engine, consult the following article on MSDN: http://msdn2.microsoft.com/en-us/library/ms365262.aspx.

Table 6-2

Description Executes the code under another user s credentials. Executes under the security credentials of the user specify ing the execution context. Executes under the security credentials of the owner of the schema that the object belongs to.