Set AUTOTRACE TRACEONLY: Displays the explain plan and the statistics; you will not see the result set, although the statement is executed.
真正执行查询，但不显示查询结果集，显示执行计划，显示统计数据。
Set AUTOTRACE TRACEONLY: Displays the explain plan and the statistics; you will not see the result set, although the statement is executed.
真正执行查询，但不显示查询结果集，显示执行计划，显示统计数据。
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