The FallbackIndex Table
In rare circumstances, the platform’s external search engine can become overloaded or otherwise unavailable, and may not be able to respond to a search request in a timely manner. Rather than returning a disappointing error to a user that has requested a search, the platform’s application server falls back to a secondary search mechanism to furnish reasonable search results.
A fall-back search is implemented as a direct database query with search conditions that reference the Name field of target application objects. To optimize global object searches (searches that span objects) without having to execute potentially expensive union queries, Force.com maintains a pivot table called FallbackIndex that records the Name of ...
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