Duplicate data prevention patterns¶

Duplicate data prevention patterns are strategies used in database management to maintain data integrity and consistency during data migration or synchronization processes.^[600-developer-database-oracle-oracle-db-link.md]

Data Insertion with Collision Avoidance¶

One common pattern involves inserting data from a source table while preventing duplicates in the destination table. This is typically achieved by filtering the source dataset against the destination records before insertion.^[600-developer-database-oracle-oracle-db-link.md]

For example, when recovering data via a database link, a query can select only those records that do not currently exist in the target table using a NOT IN or NOT EXISTS clause.^[600-developer-database-oracle-oracle-db-link.md]

Applications¶

These patterns are frequently used in scenarios requiring data recovery or synchronization, such as restoring specific order records within a date range from a remote database to a local instance.^[600-developer-database-oracle-oracle-db-link.md]

Related Concepts¶

• [[Data Integrity]]
• [[SQL Insert patterns]]
• [[Database Links]]

Sources¶

• 600-developer-database-oracle-oracle-db-link.md