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FKIstands forForeign Key Index
Full Form of FKI
What is FKI?
A Foreign Key Index (FKI) is a database index created on a column or set of columns that serve as a foreign key in a relational table. Foreign keys establish a link between data in two tables, ensuring referential integrity by requiring values in the foreign key column to match values in the primary key column of the referenced table. An FKI improves the performance of JOIN operations, foreign key constraint checks, and cascading actions such as updates or deletes. In India, FKI is widely used in database courses at universities and technical institutes like IITs and NITs, as well as in enterprise software development for banking, e-commerce, and government portals. It is commonly referenced in SQL-based interviews for roles such as database administrator, back-end developer, and data engineer. For competitive exams like GATE and UGC NET in Computer Science, understanding FKI is essential for questions on database normalization, indexing strategies, and query optimization. The concept is also relevant for professionals working with MySQL, PostgreSQL, Oracle, and Microsoft SQL Server in Indian IT firms.
FKI का फुल फॉर्म
विदेशी कुंजी सूचकांक
Example
The DBA added an FKI on the 'order_id' column in the 'payments' table to speed up transactions during peak festival season.
FKI — frequently asked questions
What is the full form of FKI?
FKI stands for Foreign Key Index, a database index on foreign key columns used to speed up joins and enforce referential integrity.
How does FKI improve query performance in SQL?
FKI allows the database engine to quickly locate matching rows in the referenced table during JOIN operations, reducing full table scans and improving overall query speed.
Is FKI automatically created when I define a foreign key constraint?
Not always. Some database systems like MySQL automatically create an index on the foreign key column, while others like PostgreSQL require explicit creation. Always check your DBMS documentation.