You can use$mergeto move data from a time series collection to another collection. distinct Command Due to the unique data structure of time series collections, MongoDB can't efficiently index them for distinct values. Avoid using thedistinctcommand ordb.collection.distinct()helper method on time...
Studio 3T’s migration tool supports the major SQL databases, including Oracle, Microsoft SQL Server, Sybase, MySQL, PostgreSQL and IBM DB2, making it easier for you to move your data from one platform to another. Fix Your Schema While Migrating Save time with a non-destructive ETL tool that...
By working closely with our partners on product launches, integrations, and real-world challenges, MongoDB has been able to bring a better understanding of the challenges facing customers—and to give them the resources and confidence to move forward with groundbreaking technology like AI . Examples...
(opCtx); auto db = databaseHolder->openDb(opCtx, _dbName); auto catalog = CollectionCatalog::get(opCtx); boost::optional<CollectionAcquisition> collection = acquireCollectionFn(opCtx); if (!collection->exists()) { writeConflictRetry(opCtx, "createCollection", nss, [&] { opCtx->checkFor...
Set up the Azure Database Migration ServiceNow that we've created our Azure Cosmos DB account, created an Azure Blob Storage account, and move our MongoDB backup files to that account its time to take care of our Azure Database Migration Service....
(StringData summary) { _planSummary = summary.toString(); } void setPlanSummary_inlock(std::string summary) { _planSummary = std::move(summary); } void setGenericCursor_inlock(GenericCursor gc); const boost::optional<SingleThreadedLockStats> getLockStatsBase() { return _lockStatsBase;...
Synchronize data from a replica set instance to another replica set or sharded cluster instance,ApsaraDB for MongoDB:The following table describes the types of source and destination MongoDB databases that are supported by DTS. In th...
Retrieve the restaurants data from hereBehaviorThe createIndex() method has the behaviors described here.To add or change index options you must drop the index using the dropIndex() method and issue another createIndex() operation with the new options. If you create an index with one set of...
Migrate MongoDB (standalone instance) to MongoDB (all architectures),Data Transmission Service:This topic explains how to use Data Transmission Service (DTS) for a full migration from a MongoDB database (standalone instance) to a MongoDB database (all ar
方法: MongoDB中的集合查询(获取一组文档中某个字段的不同值列表) 运用方法:DBCollection对象方法中的 distinct() 语句: 语句结构:distinct(key,[query]) key字符串,指定获取哪个字段的不同值;query:包含标准查询选项的对象,指定了要从哪个文档