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Finally, a change control process needs to have two separate paths The normal path through change control should require documentation of all changes, risk assess ment, testing sign-off, and approval by the business owner On rare occasions, an emergency fix is required for the production systems (for example, a security update that fixes a critical flaw in the software) Emergency change control is always a high risk because there is rarely time to fully test the change before it is rolled out to pro duction The change control process needs to be able to adapt to this situation to avoid a bottleneck in production deployments..

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Rolling back from a deployment can be accomplished by using a variety of mecha nisms, but every change made to the production environment needs to have a proce dure that has been designed and tested to roll back a change.

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The most basic rollback methodology is to back up the database prior to making a change. If the change does not succeed, the backup can be restored to put the system back in the state prior to the change. Although a backup can accomplish a rollback, it has many issues to be considered in a production environment. Any changes that have been made will be wiped out when the database is restored, which can lead to loss of business transactions. A backup can also consume a significant amount of time, lead ing to a much longer outage window than is necessary. Database Snapshots solve the problem of the length of time that is required for a backup. A Database Snapshot can be created instantly, which dramatically reduces the outage window. Although the Database Snapshot can be used to restore the data base to a previous state, wiping out any changes that might have occurred, you can also selectively move data back to the production database and avoid the extended outage required by a restore operation. The most effective way to roll back changes to production is to provide a script that reverses any changes that have been made (for example, a delete script to remove any rows that were inserted or a script to drop a column that was added to a table). Con trary to popular belief, it is always possible to construct a script to reverse changes within a database. The rollback script might require the use of logging tables when the change is being made, but it is always possible to construct a script to roll back any changes to the database.

What are the two types of change control processes A normal change control process usually requires a complete risk assess ment, testing of the change, and approval from the owner of the system. An emergency change control process is designed to handle the exceptions when code that has not been fully tested prior to deployment must be pushed to production to fix an urgent issue affecting business operations.

All database objects should be stored in a source code system, with each object being cross-referenced to the application code that is dependent on the database object. Emergency change control procedures enable changes to be deployed to produc tion to fix critical problems that are significantly affecting business operations. When deploying changes to a production environment, you should carefully evaluate each change being requested and deploy changes in a staged manner to minimize the downtime required during the build deployment.

You can use the following questions to test your knowledge of the information in Les son 5, Designing Database Procedures. The questions are also available on the com panion CD if you prefer to review them in electronic form.

Answers to these questions and explanations of why each answer choice is right or wrong are located in the Answers section at the end of the book.

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