A dtSearch incremental build is an efficient method for updating an existing dtSearch index. Instead of re-indexing all documents in the searchable set (a "full build"), an incremental build only processes and adds documents that are new to the set since the last index build was completed. This process is significantly faster and uses fewer server resources, making it ideal for workspaces where new documents are frequently added and need to be made searchable quickly.

A. Rebuilding the entire index from scratch is known as a "Full Build," which is a different, more time-consuming operation.

C. Deleting the index is a separate administrative action that completely removes the index and its associated files.

D. Exporting an index is not a standard build operation; it refers to moving or copying index files, not updating them with new documents.

1. Relativity. (n.d.). Managing dtSearch indexes. Relativity Documentation. Retrieved from https://help.relativity.com/RelativityOne/Content/Relativity/dtSearch/ManagingdtSearchindexes.htm (Section: "Incremental Build - Click to build the index for only those documents that have been added to the search set since the last build.")

2. Relativity. (n.d.). dtSearch. Relativity Documentation. Retrieved from https://help.relativity.com/RelativityOne/Content/Relativity/dtSearch/dtSearch.htm (The overview explains the purpose of dtSearch indexes and the need to update them as new documents are loaded.)