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Changes Dependent on New Application Code
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Certain database changes require implementation before new application code will function (for example, a new stored procedure or a new column in a table). The interesting part about changes tied to new application code is that many of the changes can be deployed well in advance of the maintenance window in which the application code is deployed. A good example of this type of change is the implemen tation of a new object within the database. If you are deploying a new stored proce dure, function, table, and so on that is not currently being used by the application, it does not matter when the change is made as long as the object is in place before the application code is deployed.
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Adding new columns
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Even adding a new column to a table should not affect an application at all. The column can be added to the table and even populated incrementally while applications are performing opera tions. The only time that it is impossible to add a new column without affecting an application is when a developer has violated one of the most basic coding standards do not use SELECT * in an application.
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By eliminating all the changes that introduce new elements into the database, a data base code deployment that is dependent on new application code is reduced to only the set of objects that are replacing already-existing objects.
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Changes Independent of Application Code
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Database changes that are independent of application code can be applied to produc tion at a time when it is convenient to operational systems. The only consideration that needs to be made is the impact to users. As long as the change does not cause
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Designing the Physical Database
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blocking or availability issues for users, DBAs can implement the changes during any time frame without taking an outage on the application. If the change affects users, it should be reserved for either a low-activity period or moved into an outage window. Examples of these types of changes include the following:
Creating new indexes Dropping unused objects Rebuilding indexes Implementing replication, Database Mirroring, and log shipping
Changes Dependent on Old Application Code
The last category of changes is rare within IT organizations. The rarity occurs, not because there aren t changes of this type, but because few organizations ever clean up objects or code that are no longer being used by an application. How do we know Over the many years we have been working on database environ ments, we have yet to find a database that does not have unused objects after the sec ond major build has been applied. Changes dependent on old code can simply be categorized as the objects that should be removed from your database because the objects are no longer referenced by appli cations. This is an aspect of code deployments that you should follow strictly. Each extraneous object existing within a database makes managing the objects that are being used more difficult. In one extreme example, we eliminated more than 17,000 database objects at one customer site with a corresponding reduction of their docu mentation by more than 75 percent as well as a reduction in development time by more than 60 percent. Dropping obsolete objects from a database can occur at any time following the deployment of the application code that made the objects obsolete. Because applica tion code is no longer accessing the object, there is no application impact to dropping the object.
Change Control Procedures
Change control has come a long way in the last five years. Previously the bane of some administrators, it is a vital part of making any changes in an environment. The pur pose of change control procedures is to ensure that all changes are documented and approved.
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