Question

我有Nav Collection，有178097条记录。

下面是样本集合。

{ 
"_id" : ObjectId("5911cdbe891123031552713e"), 
"_class" : "org.maruti.mfm.data.entity.Nav", 
"asAtDate" : ISODate("2017-05-07T16:00:00.000+0000"), 
"nav" : 10.1102, 
"repurchasePrice" : 0.0, 
"salePrice" : 0.0, 
"latest" : false, 
"scheme" : DBRef("scheme", ObjectId("58d760a32ac5bf0405b69afa"))
}

从这些178097中，只有14174条记录最新：真实。

下面是我在java中的映射

@Document

公共类Nav扩展了BaseEntity {

private static final long serialVersionUID = 1L;

@Id
private String id;

@Indexed
@DBRef
private Scheme scheme;

@Indexed
private Date asAtDate;
private double nav;
private double repurchasePrice;
private double salePrice;

@Indexed
private boolean latest;

然而，当我使用以下方法查找具有最新标志的所有导航集合时。它花了超过1分钟才能找到178k记录中的大约14,000条记录。

public interface NavRepository extends MongoRepository<Nav, String> {

    List<Nav> findByLatest(boolean latest);

}

无论如何都要改善表现。

解释结果

db.nav.find({latest:true}).explain();
{
"queryPlanner" : {
    "plannerVersion" : 1,
    "namespace" : "mfmunshi.nav",
    "indexFilterSet" : false,
    "parsedQuery" : {
        "latest" : {
            "$eq" : true
        }
    },
    "winningPlan" : {
        "stage" : "FETCH",
        "inputStage" : {
            "stage" : "IXSCAN",
            "keyPattern" : {
                "latest" : 1
            },
            "indexName" : "latest",
            "isMultiKey" : false,
            "multiKeyPaths" : {
                "latest" : [ ]
            },
            "isUnique" : false,
            "isSparse" : false,
            "isPartial" : false,
            "indexVersion" : 2,
            "direction" : "forward",
            "indexBounds" : {
                "latest" : [
                    "[true, true]"
                ]
            }
        }
    },
    "rejectedPlans" : [ ]
},
 "serverInfo" : {
    "host" : "Jigars-MacBook-Pro.local",
    "port" : 27017,
    "version" : "3.4.2",
    "gitVersion" : "3f76e40c105fc223b3e5aac3e20dcd026b83b38b"
},
"ok" : 1
}

当我从终端窗口触发时，查询花了0.057秒。

Spring Data + MongoDb Query需要花费大量时间

0 个答案: