By Hernando Bedoya; et al
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Extra info for Advanced functions and administration on DB2 Universal Database for iSeries
The sequence for deleting a parent key value with CASCADE, SET NULL, or SET DEFAULT rules is: A shared lock (*SHRUPD) is obtained on the parent file and file member. An update lock is obtained on the parent record being deleted. A shared lock (*SHRUPD) is obtained only on the dependent file member. The system also logically opens and allocates the dependent file at this time. All matching dependent records (if any) are allocated exclusively with an update lock, and the corresponding update or delete operation is executed.
The DBMS then gains control and enforces the associated delete CASCADE rules, causing all the matching rows in the dependent file (all the products) and eventually all the features related to the products to be deleted. Side-effect journal entries (2311 through 2320) are logged as a result of the constraint enforcement performed by DB2 UDB for iSeries. Note: Until the parent file is closed (entry 2322) in this delete cascade operation, you cannot run the Change Journal (CHGJRN) command on this journal.
If the system finds invalid foreign key values during the creation of the referential constraint, the constraint is still added to the file. The DBMS also automatically disables the referential constraint and marks the relationship as check pending. However, if invalid foreign key values are found during constraint creation through the SQL interface, the constraint is not added to the file. Implicit creation of a primary key constraint DB2 UDB for iSeries allows you, in some cases, to define a referential constraint on a dependent file even if there is no primary or unique key constraint defined on the parent file.
Advanced functions and administration on DB2 Universal Database for iSeries by Hernando Bedoya; et al