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When loading data into tables with foreign key constraints, ensuring referential integrity is crucial. However, setting FOREIGN_KEY_CHECKS to 0 during the load can result in data inconsistencies after reenabling them.
To address this, consider using the provided stored procedure: ANALYZE_INVALID_FOREIGN_KEYS.
DELIMITER $$ CREATE PROCEDURE `ANALYZE_INVALID_FOREIGN_KEYS`( checked_database_name VARCHAR(64), checked_table_name VARCHAR(64), temporary_result_table ENUM('Y', 'N')) LANGUAGE SQL NOT DETERMINISTIC READS SQL DATA BEGIN DECLARE VARIABLES... OPEN foreign_key_cursor; foreign_key_cursor_loop: LOOP FETCH foreign_key_cursor INTO TABLE_SCHEMA_VAR, ... SET @from_part = CONCAT(...); SET @full_query = CONCAT(...); PREPARE stmt FROM @full_query; EXECUTE stmt; IF @invalid_key_count > 0 THEN INSERT INTO INVALID_FOREIGN_KEYS SET `TABLE_SCHEMA` = TABLE_SCHEMA_VAR, ... END IF; DEALLOCATE PREPARE stmt; END LOOP foreign_key_cursor_loop; END$$ DELIMITER ;
This procedure analyzes all foreign keys and identifies any rows that violate them. The results are stored in the INVALID_FOREIGN_KEYS table.
To use this procedure:
Note that this procedure requires indexes on both referring and referred columns for optimal performance.
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