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h1. What is GraphDB’s Explain Plan

GraphDB’s Explain Plan is a feature that explains how GraphDB executes a SPARQL query and also includes information about unique subject, predicate and object collection sizes. It can help you improve the query, leading to better execution performance.

{info}The Explain Plan was introduced in GraphDB version 6.0/6.1 and has been used as the regular feature up until version 6.4.3 when an improved Experimental Explain Plan was introduced. Both features are available for GraphDB versions 6.4.3 and 6.4.4.{info}

{note}When queries are more complex, the Experimental Explain Plan works better than the regular one.{note}