In this scenario, to enhance query performance, denormalization can be employed. Denormalization involves introducing redundancy in the database design to reduce the number of joins, leading to faster query execution. It's especially useful when dealing with read-heavy workloads and large datasets.

An attribute is said to be Transitive if it is dependent on the primary key, as well as on some other attribute(s) within the same table. This situation is resolved by normalization to reduce redundancy.

Boyce-Codd Normal Form (BCNF) is the highest level of normalization that a relational database can achieve. It ensures that there are no non-trivial functional dependencies of attributes on the primary key.

In relational schema design, a primary key uniquely identifies a record within a table. It serves as a unique identifier for each row and ensures data integrity in the table.

Database design tools like MySQL Workbench or Microsoft Visio use Entity-Relationship Diagrams (ERD) to help users visualize the database schema. ERDs illustrate the relationships between entities and their attributes, aiding in the understanding and planning of the database structure.

In this scenario, creating composite indexes on the frequently searched columns like category, brand, and price would optimize search performance. Composite indexes cover multiple columns and are efficient for queries involving those columns.

In certain scenarios, Data Marts offer advantages over Data Warehouses by focusing on specific business departments. This targeted approach allows for quicker implementations and more tailored solutions, making them efficient for specific analytical needs.

The primary goal of denormalization in database design is to optimize for read operations. It involves intentionally introducing redundancy to simplify queries and improve performance, especially for read-heavy applications.

In databases, the most common data structure used for indexing is a tree structure, particularly a B-tree or a variant like B+ tree. These structures provide efficient searching and retrieval of data, making them suitable for indexing purposes.

The second normal form (2NF) eliminates Partial dependencies. In 2NF, every non-prime attribute is fully functionally dependent on the primary key, addressing issues where only part of the primary key determines some non-prime attributes.

To prevent a user from following themselves on a social media platform, you would use a Check Constraint. This constraint allows you to specify a condition, ensuring that the value in the follow relationship does not match the user's own ID.

A Snowflake Schema is generally considered more complex than a Star Schema. In a Snowflake Schema, Dimension Tables are normalized, leading to more relationships and potentially more joins in queries. This normalization can add complexity to the schema design and make queries more intricate compared to the denormalized structure of a Star Schema.