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Tips for Disabling RI for High-Impact Oracle Data Loading
September 21, 2004

In an article titled "Don't Let Referential Integrity Degrade Your Database Performance", the author notes some valuable tricks for getting high-speed data loads when using foreign key constraints:
 
 
Foreign key (FK) constraints without supporting indexes can cause severe performance problems during SQL queries and massive DML (Data Manipulation Language) operations, such as DELETEs or UPDATEs. Use a SQL script to detect unindexed foreign key constraints.
 
The Problem he says, is this:
 
Foreign key (FK) constraints without supporting indexes can cause severe performance problems during SQL queries and massive DML (Data Manipulation Language) operations, such as DELETEs or UPDATEs.
 
The solution proposed in the article:
 
Use a SQL script to detect unindexed foreign key constraints, review each constraint case individually, and either add an index�if it doesn't slow down your DML operations substantially or disable FK constraints just to perform massive DML operations, and then enable them back.
 

 


 

 
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