Database Commands / Aggregation Definition count Counts the number of documents in a collection or a view. Returns a document that contains this count and as well as the command status. Tip Inmongosh, this command can also be run through thecount()helper method. ...
ThelistCollectionsandlistIndexescommands and their helper methods. Other non-CRUD and non-informational operations, such ascreateUser,getParameter,count, etc. and their helpers. Transactions have a lifetime limit as specified bytransactionLifetimeLimitSeconds. The default is 60 seconds. ...
mongodb_ss_metrics_aggStageCounters_sortByCount cl_id cl_role rs_nm rs_state mongodb_ss_metrics_aggStageCounters_unset cl_role rs_nm rs_state cl_id mongodb_ss_metrics_aggStageCounters_unwind cl_role rs_nm rs_state cl_id mongodb_ss_metrics_commands_abortTransaction_failed cl_id cl_role...
线程池超时增强 从MongoDB 5.0开始,您可以使用新的replWriterMinThreadCount服务器参数来允许关闭超过此最小值的空闲线程。当replWriterMinThreadCount配置为小于replWriterThreadCount的值时,超过replWriterMinThreadCount的空闲线程将超时关闭 enableOverrideClusterChainingSetting 参数(级联) 从MongoDB 5.0.2版本开始(以及4....
= 0) } } } trait MGOCommands object MGOCommands { case class Count(filter: Option[Bson] = None, options: Option[Any] = None) extends MGOCommands case class Distict(fieldName: String, filter: Option[Bson] = None) extends MGOCommands /* org.mongodb.scala.FindObservable import com.mongo...
要在本地运行 MongoDB,您必须创建一个数据目录。执行下一个命令并在任何您想要的文件夹中创建数据目录: mkdir -p ~/mytools/mongodb 要验证安装是否成功,请在本地运行 MongoDB。为此,您需要使用mongo命令并提供数据目录的路径: mongod --dbpath ~/mytools/mongodb 执行此命令后,MongoDB 将在默认端口270...
var DATABASE = DRIVERSESSION.getDatabase(DB_NAME);返回DB类型。DRIVERSESSION.startTransaction开始事务。DRIVERSESSION.startTransaction();EDITORedit辅助扩展使用的编辑器路径。也可在环境变量中设置。var EDITOR = "EDITOR_PATH";ISODate创建UTC时间。var DATE = new ISODate(); var DATE = new ISODate(STR)...
_ import MGOCommands._ import com.datatech.sdp.result.DBOResult.DBOResult import MongoModels._ object MongoRepo { class MongoRepo[R](db:String, coll: String, converter: Option[Document => R])(implicit client: MongoClient) { def getAll(next:Option[String],sort:Option[String],fields:Option...
1. Built-in MongoDB Monitoring Commands MongoDB provides two very useful commands to check its health and status: mongostat mongotop You can usemongostatto get a quick overview of the MongoDB instance with information about the number of operations, usage, size, and network utilization. A quic...
作为请求的访问入口,所有的请求都由mongos来路由、分发、合并,这些动作对客户端driver透明,用户连接mongos就像连接mongod一样使用。Mongos会根据请求类型及shard key将请求路由到对应的Shard。 2.Config Server 【配置服务器】 存储Sharding Cluster 的所有元数据,所有的元数据都存储在config数据库; ...