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By P. Bellot, B. Robinet (auth.), Guy Cousineau, Pierre-Louis Curien, Bernard Robinet (eds.)

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Read or Download Combinators and Functional Programming Languages: Thirteenth Spring School of the LITP Val d'Ajol, France, May 6–10, 1985 Proceedings PDF

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Extra info for Combinators and Functional Programming Languages: Thirteenth Spring School of the LITP Val d'Ajol, France, May 6–10, 1985 Proceedings

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Remove RD441 from FEATURE remove YH532 from FEATURE Figure 3-11 System-started commitment control cycle When the DELETE operation is performed, DB2 UDB for iSeries activates an implicit commitment control cycle 2. If a failure occurs in 3, the records that were removed are placed back into the files. Any changes in 1 are not affected by an automatic rollback. Figure 3-12 shows the same scenario as previously described, but with a native RPG ILE program handling the delete cascade. 44 Advanced Functions and Administration on DB2 Universal Database for iSeries FORDERH FAnother UF A UF C C C C keyval E E K DISK K DISK COMMIT ...

Foreign key A foreign key is a field or a set of fields in a physical file whose value, if not null, must match a value of the parent key in the related referential constraint. The value of a foreign key is null if at least one of the key fields is null. Referential constraint A referential constraint is the file attribute that causes the database to enforce referential integrity for the defined relationship. Referential integrity Referential integrity is the state of a database in which the values of the foreign keys are valid.

Therefore, the less your foreign and parent keys change, the less time the DBMS spends verifying referential integrity. 2 Journaling and commitment control requirements When a referential constraint is defined with a delete or update rule other than RESTRICT, the system has to perform some actions on the corresponding foreign keys each time a delete or an update of the parent key takes place. For a delete case, for example, it deletes the matching dependent records when the delete rule is CASCADE.

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