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# Synchronize the Category Index with Stored Categories

You can use the `CategorySyncCatDRE` action to synchronize the IDOL category index with the categories stored on disk. `CategorySyncCatDRE` deletes the current contents of the category index, and overwrites it with the category information stored on disk. For example:

    action=CategorySyncCatDRE

In this example, the IDOL Category component synchronizes its category index with the categories stored on disk.

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