June 2018
Intermediate to advanced
478 pages
10h 52m
English
Content preview from IBM Db2 11.1 Certification Guide
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Revalidation of database objects
Many Db2 objects are dependent on other Db2 objects. A very common dependency between two base objects is the parent-child relationship, as defined by referential integrity (RI) constraints. Other dependent objects, such as triggers, views, and aliases, depend completely on base objects for their existence. When the status of base objects changes significantly, dependent objects can be invalidated. For example, if a base object is dropped (or in some cases, altered), then any dependent objects, such as triggers or indexes, become invalid.
Invalid database objects must be revalidated before they can be used. Revalidation is achieved by reprocessing the DDL to recreate the dependent object. Automatic revalidation ...
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