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The most significant step that can be taken for availability is to continuously evaluate and make improvements to processes and operational procedures. Continuously reviewing and monitoring security helps ensure that databases don t become unavailable because of security breaches. Monitoring processes can be con figured across several layers of the environment. You should audit all login and logoff events at a Windows level and at a SQL Server. Implement data definition language (DDL) triggers to notify an administrator any time a permission is granted or revoked directly using a GRANT statement or indirectly through role membership. Use DDL triggers to notify administrators when logins, database users, schemas, or certificates are created, modified, or dropped. Additionally, all DDL events that enable encryp tion should trigger a notification so that DBAs can ensure that the proper master keys and certificates are backed up as well as created on any standby system. Tracking the creation, alteration, or deletion of any object within your SQL Server instances ensures that DBAs are always aware of any changes to databases and can address unauthorized changes immediately. If you do not have change control processes in place, you need to implement at least a system to document the changes as a first step. Your change control procedure needs to undergo periodic review to ensure that current procedures still meet busi ness objectives. At a minimum, you need to review all processes and procedures within your environ ment that allow high availability to occur every three months. This three-month review cycle ensures that any gaps in coverage are found as quickly as possible.

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1. You should create a DDL trigger that fires on CREATE, ALTER, and DROP statements (for example, ALTER TABLE or DROP DATABASE). The trigger should roll back the transaction. DDL triggers are enabled by default. The trigger

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Database backups need to be periodically reviewed to ensure that restore operations can still occur within acceptable time frames. This review process also ensures that you know where all your backups are and can locate all the media associated with a restore operation. Backup review processes also consider all the ongoing capacityplanning processes so that you can predict when a particular failover process no longer meets business needs and requires additional technology to be deployed.

Typically, you will only use ODBC or OLE DB when your development language is C++. However, if you have a compelling reason to use ODBC with Visual Basic .NET or Visual C# .NET, an add-on component is provided. For more information about using ODBC with Visual Basic .NET or Visual C# .NET, refer to the MSDN articles at http://support.microsoft.com/kb/310985/ and http://support .microsoft.com/kb/310988.

If you determine that your current environment no longer meets the availability objec tives of your company, you need to plan for the implementation of new technology This plan can be as simple as adding capacity to an existing server or upgrading the hardware platform You will eventually come to the end of all of the simple solutions and will need to make major infrastructure changes Fortunately, many of these changes can be made nearly transparent to users and applications If you need to deploy a log shipping or Database Mirroring solution, the most difficult part of the process is acquiring and building the additional servers you will need Each of these technologies relies on database backups to be initialized, so existing backups can be used during the implementation Log shipping can be implemented without incurring any downtime at all on the primary system.

should be disabled only when a migration script runs. You cannot use some statements for example, CREATE DATABASE in a DDL trigger. You should instead use event notifications for these statements. 2. You should use the CHECK constraint, which ensures that entries to a column meet specified format requirements. 3. You should use a full outer join on the EmployeeID column. This returns results even when no match exists between records in that column. You can use a WHERE clause to return results on a per-project basis, or to return all results where no match exists on the joining column. 4. You should use the Fuzzy Lookup transformation, which performs data-cleaning tasks such as standardizing data, correcting data, and providing missing values. 5. You should add Don s account to the db_datareader fixed database role.