Invention Grant
US08645406B2 Exploiting conditions to optimize expensive database queries 有权
利用条件优化昂贵的数据库查询

Exploiting conditions to optimize expensive database queries
Abstract:
A fallback query mechanism that serves as a way to recover from query conditions (or criteria) that break due to excessively large result sets relative to a preset threshold. The fallback query mechanism detects when a query has failed to execute because the query requested more items from the database (or list) than allowed by the threshold, rewrites the query to examine no more than the threshold number of most recently created items that match one of the indexed filter criteria specified in a view, and then applies one or more of the other filter criteria. The mechanism then reruns the query and displays the results to the user.
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