Advanced functions and administration on DB2 Universal by Hernando Bedoya; et al

By Hernando Bedoya; et al

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You will experience better performance when your foreign key fields and parent key fields have identical null attributes. In fact, the non-null field attributes deliver the best performance. Ideally, your parent and foreign key fields should be fairly stable, something similar to a person's social security number. This is due to the fact that, to guarantee integrity, the system must verify referential integrity each time your parent and foreign key values change. Therefore, the less your foreign and parent keys change, the less time the DBMS spends verifying referential integrity.

Referential integrity Referential integrity is the state of a database in which the values of the foreign keys are valid. That is, each non-null foreign key value has a matching parent key value. Parent file The parent file contains the parent key in a referential constraint. Dependent file The dependent file contains the foreign key in a referential constraint. Referential constraint rules The referential constraint definitions also include delete and update rules that define which actions should be taken by the DBMS when a parent key value is updated or deleted.

The user requested that the access path be rebuilt. 3 - Access path is a temporary access path (resides in library QTEMP) and was not specified as the file to be queried. 4 - The cost to use this access path, as determined by the optimizer, was higher than the cost associated with the chosen access method. More... Press Enter to continue. F3=Exit F6=Print F9=Display message details F21=Select assistance level F12=Cancel Figure 3-2 Physical file constraints evaluated by the optimizer Chapter 3. Referential integrity 27 As highlighted in bold in Figure 3-2, ORDENTL/ORDERDTL is the access path shared by the primary key and the SQL index ORDDTLIDX.

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