Couchbase中的索引-使用主索引而不是辅助索引

Question

我在couchbase中运行了很多此查询

SELECT * FROM dev_hostel  where data.type = 'Guesthouse'and data.id = '12'

所以，我创建了这个索引

CREATE INDEX `type-id-index` ON `dev_hostel`(`data.type`,`data.id`)

但是当我解释查询时，我看到未使用创建的索引，但使用了主索引

{
  "plan": {
    "#operator": "Sequence",
    "~children": [
      {
        "#operator": "PrimaryScan3",
        "index": "#primary",

Answer 1

背tick在错误的位置。索引必须如下。由于字段中没有特殊字符，因此您也可以省略回勾号。

CREATE INDEX `type-id-index` ON `dev_hostel`(data.type,data.id);

FYI: _host is object and kind is field(nested) in object. 
You reference as _host.kind or `_host`.`kind`. If you do `_host.kind` it looking field "_host.kind" not sub object. 
If you want reference s1 you must use `f1.f2`.s1 because there is dot in the field you must do `f1.f2`.s1


{
  "_host": {
    "kind": "KIND1",
    "id": "ID1"
     },
  "f1.f2": { "s1": 10}
}

探索索引顾问https://index-advisor.couchbase.com/