MongoDB optimizes the data, as it stores data ordered by time as opposed to the natural order in regular collections. You can improve query performance by adding secondary indexes on the metaField and/or the tim
For example, in the following document,metadatais a good choice ofmetaFieldsince it makes it easy to query data from a given weather sensor. Using these fields, MongoDB buckets readings from a single sensor together. { timestamp:ISODate("2021-05-18T00:00:00.000Z"), ...
Repository; import java.util.Date; import java.util.List; @Repository public interface YourRepository extends MongoRepository<YourDocumentClass, String> { @Query("{ 'timeField': { $gte: ?0, $lte: ?1 } }") List<YourDocumentClass> findByTimeRange(Date startTime, Date endTime)...
集群同步(Cluster-to-Cluster Sync) 时序集合(Time Series Collection) 变更流(Change Streams) 聚合(Aggregation) 查询(Query) 弹性 安全性 4.MongoDB7.0版本新特性 支持分片元数据一致性校验 支持采样查询与分析分片键(analyzeShardKey) 自动合并(AutoMerger) 分片(Sharding) 安全性 聚合(Aggregation) 时序集合(Time...
timeField: "timestamp", metaField: "metadata", granularity: "seconds" }, dataTier: "cloud.data_lake.preview" }) db.logs.insertMany([ { timestamp: new Date(), message: "Log entry 1", metadata: { source: "app1" } }, { timestamp: new Date(), message: "Log entry 2", metadata...
fieldN: <max valueN> } } ) 例如,如果要指定独占上界,请记住对包含索引{ age: 1 }的名为collection的集合执行以下运算: db.collection.find( { <query> } ).max( { age: 100 } ).hint( { age: 1 } ) 此运算将查询限制为字段年龄小于100的文档,并强制执行将{ age: 1 }索引从minKey扫描到 ...
template.createCollection("weather", CollectionOptions.timeSeries("timestamp")); 1. 创建从批注派生的时间序列集合 @TimeSeries(collection="weather", timeField = "timestamp") public class Measurement { String id; Instant timestamp; // ... ...
form. The index stores the value of a specific field or set of fields, ordered by the value of the field. The ordering of the index entries supports efficient equality matches and range-based query operations. In addition, MongoDB can return sorted results by using the ordering in the ...
时序集合(Time Series Collection) 变更流(Change Streams) 聚合(Aggregation) 查询(Query) 弹性 安全性 MongoDB7.0 新特性 支持分片元数据一致性校验 支持采样查询与分析分片键(analyzeShardKey) 自动合并(AutoMerger) MongoDB7.0 优化项 其他优化 安全性
form. The index stores the value of a specific field or set of fields, ordered by the value of the field. The ordering of the index entries supports efficient equality matches and range-based query operations. In addition, MongoDB can return sorted results by using the ordering in the ...