Flat Catalog

Magento typically stores catalog data in multiple tables, based on the Entity-Attribute-Value
(EAV1) model. Because attributes are stored in many tables, SQL queries are sometimes long
and complex.

In contrast, a flat catalog creates new tables on the fly, where each row contains all the
necessary data about a product or category. The flat catalog is updated automatically—either
every minute, or according to your cron job. Flat catalog indexing also applies to catalog and
shopping cart price rules. A catalog with as many as 500,000 SKUs can be indexed quickly as a
flat catalog. To learn more, see: Setting Up a Flat Catalog.

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