Oracle Data Dictionary: Mismatches and Validation

原创爱被打了一巴掌 2025-03-17 03:12 23阅读 0赞

In Oracle's Data Dictionary (DD), mismatches and validation refer to the process of checking and ensuring the consistency, accuracy, and adherence to defined rules in database objects.

1. Mismatches:
   - Data type mismatch: When a value of a certain data type is assigned to an object expecting a different data type.
   - Column name mismatch: If a SQL statement references columns by names that do not match the actual column names in the DD, it can cause mismatches.
   
2. Validation:
   - Syntax validation: Oracle checks the syntax of database objects like tables, columns, and constraints to ensure they are valid according to the DD's rules.
   - Semantic validation: This goes beyond syntax to check that the data being stored or manipulated adheres to business rules, constraints, and dependencies defined in the DD.
   
In summary, mismatches and validation in Oracle Data Dictionary refer to the process of ensuring that database objects and their data are consistent, accurate, and adhere to predefined rules.

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