mirror of https://gitee.com/bigwinds/arangodb
46 lines
1.5 KiB
Plaintext
46 lines
1.5 KiB
Plaintext
arangosh> db._create("test");
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[ArangoCollection 6948, "test" (type document, status loaded)]
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arangosh> for (i = 0; i < 100; ++i) { db.test.save({ value: i }); }
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arangosh> db.test.ensureIndex({ type: "skiplist", fields: [ "value" ] });
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{
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"id" : "test/7252",
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"type" : "skiplist",
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"fields" : [
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"value"
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],
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"unique" : false,
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"sparse" : false,
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"isNewlyCreated" : true,
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"code" : 201
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}
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arangosh> var explain = require("@arangodb/aql/explainer").explain;
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arangosh> explain("FOR i IN test FILTER i.value > 97 SORT i.value RETURN i.value", {colors:false});
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Query string:
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FOR i IN test FILTER i.value > 97 SORT i.value RETURN i.value
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Execution plan:
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Id NodeType Est. Comment
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1 SingletonNode 1 * ROOT
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9 IndexNode 50 - FOR i IN test /* skiplist index scan */
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5 CalculationNode 50 - LET #3 = i.`value` /* attribute expression */ /* collections used: i : test */
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8 ReturnNode 50 - RETURN #3
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Indexes used:
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By Type Collection Unique Sparse Selectivity Fields Ranges
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9 skiplist test false false n/a [ `value` ] (i.`value` > 97)
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Optimization rules applied:
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Id RuleName
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1 move-calculations-up
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2 move-filters-up
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3 remove-redundant-calculations
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4 remove-unnecessary-calculations
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5 move-calculations-up-2
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6 move-filters-up-2
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7 use-indexes
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8 remove-filter-covered-by-index
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9 use-index-for-sort
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10 remove-unnecessary-calculations-2
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