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Enable Flat Product and Category Tables in Magento

To enable flat table support in Magento, go to System > Configuration > Catalog > Frontend in your administration dashboard.

Change the Use Flat Catalog Category and Use Flat Catalog Product settings to Yes and click the Save button.

In Magento 2+, edit vendor\magento\module-catalog\etc\config.xml to set flat_catalog_category system value.

After enabling the settings, go to System > Index Management and update the flat data indexes.