mirror of https://gitee.com/bigwinds/arangodb
45 lines
3.4 KiB
Plaintext
45 lines
3.4 KiB
Plaintext
arangosh> db._create(<span class="hljs-string">"test"</span>);
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[ArangoCollection <span class="hljs-number">1092291992475</span>, <span class="hljs-string">"test"</span> (type <span class="hljs-built_in">document</span>, status loaded)]
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arangosh> <span class="hljs-keyword">for</span> (i = <span class="hljs-number">0</span>; i < <span class="hljs-number">100</span>; ++i) { db.test.save({ value: i }); }
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arangosh> db.test.ensureSkiplist(<span class="hljs-string">"value"</span>);
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{
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<span class="hljs-string">"id"</span> : <span class="hljs-string">"test/1092311980955"</span>,
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<span class="hljs-string">"type"</span> : <span class="hljs-string">"skiplist"</span>,
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<span class="hljs-string">"fields"</span> : [
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<span class="hljs-string">"value"</span>
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],
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<span class="hljs-string">"unique"</span> : <span class="hljs-literal">false</span>,
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<span class="hljs-string">"sparse"</span> : <span class="hljs-literal">false</span>,
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<span class="hljs-string">"isNewlyCreated"</span> : <span class="hljs-literal">true</span>,
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<span class="hljs-string">"code"</span> : <span class="hljs-number">201</span>
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}
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arangosh> <span class="hljs-keyword">var</span> explain = <span class="hljs-built_in">require</span>(<span class="hljs-string">"@arangodb/aql/explainer"</span>).explain;
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arangosh> explain(<span class="hljs-string">"FOR i IN test FILTER i.value > 97 SORT i.value RETURN i.value"</span>, {colors:<span class="hljs-literal">false</span>});
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Query string:
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FOR i IN test FILTER i.value > <span class="hljs-number">97</span> SORT i.value RETURN i.value
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Execution plan:
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Id NodeType Est. Comment
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<span class="hljs-number">1</span> SingletonNode <span class="hljs-number">1</span> * ROOT
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<span class="hljs-number">9</span> IndexNode <span class="hljs-number">50</span> - FOR i IN test <span class="hljs-comment">/* skiplist index scan */</span>
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<span class="hljs-number">5</span> CalculationNode <span class="hljs-number">50</span> - LET #<span class="hljs-number">3</span> = i.<span class="hljs-string">`value`</span> <span class="hljs-comment">/* attribute expression */</span> <span class="hljs-comment">/* collections used: i : test */</span>
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<span class="hljs-number">8</span> ReturnNode <span class="hljs-number">50</span> - RETURN #<span class="hljs-number">3</span>
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Indexes used:
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By Type Collection Unique Sparse Selectivity Fields Ranges
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<span class="hljs-number">9</span> skiplist test <span class="hljs-literal">false</span> <span class="hljs-literal">false</span> n/a [ <span class="hljs-string">`value`</span> ] i.<span class="hljs-string">`value`</span> > <span class="hljs-number">97</span>
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Optimization rules applied:
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Id RuleName
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<span class="hljs-number">1</span> move-calculations-up
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<span class="hljs-number">2</span> move-filters-up
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<span class="hljs-number">3</span> remove-redundant-calculations
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<span class="hljs-number">4</span> remove-unnecessary-calculations
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<span class="hljs-number">5</span> move-calculations-up-<span class="hljs-number">2</span>
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<span class="hljs-number">6</span> move-filters-up-<span class="hljs-number">2</span>
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<span class="hljs-number">7</span> use-indexes
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<span class="hljs-number">8</span> remove-filter-covered-by-index
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<span class="hljs-number">9</span> use-index-<span class="hljs-keyword">for</span>-sort
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