DB 2提供的GUI和命令行工具可以用来查看查询的解释计划。

DB2 provides GUI and command line tools to see explain plan of a query.

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此外，还将讨论优化器的角色，其中包括OPTCOMPIND参数、查询命令和内部统计数据。

In addition, it discusses the role of the optimizer, including the OPTCOMPIND parameter, query directives, and internal statistics.

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清单2 . arq命令指定数据源、SPARQL查询的位置和结果格式。

Listing 2. arq command specifying data sources, location of SPARQL query, and results format.

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