# Regenerate an IDOL Subindex

(Applies to IDOL Content and IDOL Agentstore components, DIH, and IDOL Proxy)

IDOL data index regeneration allows IDOL to rebuild the index of stored information from document field values in the server. You might need to regenerate an index if:

- validation of a subindex has failed, indicating that the data is no longer in a consistent state. See Validate IDOL Content Subindexes.
- you have made a change to the field configuration for certain field types.
- you have documents that use `ReferenceMemoryMappedType` fields, and which were indexed out of order.

The `DREREGENERATE` index action regenerates the indexes. For more information about `DREREGENERATE`, see the IDOL Server Reference. For more information about the circumstances in which you can run index regeneration for different index types, see the IDOL Server Administration Guide and IDOL Expert.

To regenerate a subindex

1. On the Console page, go to the Service Control tab.

2. Click Regenerate.

   The Regenerate dialog box opens. This dialog box includes a warning. Regeneration can take some time, and might reduce the responsiveness of your server. The server is still available for querying during the regeneration process.

3. In the Type box, select the type of subindex that you want to regenerate.
4. Optionally select a priority for the index action.
5. Click Regenerate.

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