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The query compiler tries to optimize and speed up queries by applying the index whenever it is possible and seems promising. To see how a query is rewritten, and if an index is used, you can turn on the [[GUI#Visualizations|Info View]] in the GUI or use the [[Command-Line Options#BaseX_Standalone|-V flag]] on the command line:
* A message like <code>Applying apply text index for "Japan"</code> indicates that the text index is applied to speed up the search of the shown string. The following message…* <code>Removing path with no index results</code> indicates that a string in a path expression will never yield results. Because of that, the path does not need to be evaluated at all.
* If you cannot find any index optimization hints in the info output, it often helps if you rewrite and simplify your query.<br/>
