在我的系统上创建事件文档大约花了50秒，我在events集合中添加了一个mynum的索引，然后运行第二个查询（最后添加了一个RETURN NEW），处理边缘大约花了70秒（加上渲染边缘子集的时间）：

我使用的是ArangoDB 3.6.0，在Windows 10下使用RocksDB引擎，英特尔i7- 6700 K 4x4.0 GHz，32 GB内存，三星Evo 850固态硬盘。
您确定索引设定正确吗？请解释查询并检查执行计划，您可能觉得有些不同？

Execution plan:
 Id   NodeType                     Est.   Comment
  1   SingletonNode                   1   * ROOT
  3   EnumerateCollectionNode   1000000     - FOR c IN events   /* full collection scan, projections: `mynum`, `_id` */
  9   IndexNode                 1000000       - FOR p IN events   /* persistent index scan, projections: `_id` */
  6   CalculationNode           1000000         - LET #5 = { "_from" : p.`_id`, "_to" : c.`_id` }   /* simple expression */   /* collections used: p : events, c : events */
  7   InsertNode                1000000         - INSERT #5 IN ChildEvents 
  8   ReturnNode                1000000         - RETURN $NEW

Indexes used:
 By   Name                      Type         Collection   Unique   Sparse   Selectivity   Fields        Ranges
  9   idx_1655926293788622848   persistent   events       true     false       100.00 %   [ `mynum` ]   (p.`mynum` == (c.`mynum` + 1))

Optimization rules applied:
 Id   RuleName
  1   move-calculations-up
  2   move-filters-up
  3   interchange-adjacent-enumerations
  4   move-calculations-up-2
  5   move-filters-up-2
  6   remove-data-modification-out-variables
  7   use-indexes
  8   remove-filter-covered-by-index
  9   remove-unnecessary-calculations-2
 10   reduce-extraction-to-projection