database - Mongo 错误查询ExceededMemoryLimitNoDiskUseAllowed

Question

当我使用此查询时出现此错误：

db2.collection('candata')
.aggregate([{$sort:{time:-1}},{$group:{_id:{batteryId:"$batteryId"},soctime:{$first:"$time"},GPSStatus:{$first:"$GPSStatus"},CANStatus:{$first:"$CANStatus"},soc: { $first : "$socpercentage" },charging_status: { $first : "$charging_status" },status: { $first : "$status" }}},{$sort:{'_id.batteryId':1}},{$lookup:{from : "swap_table",localField : "_id.batteryId",foreignField:"batteryId",as:"swap"}},{$lookup:{from : "battery_status_table",localField : "_id.batteryId",foreignField:"batteryId",as:"battery_statustb"}}])

我需要做什么改变？我不想更改查询，那么如何增加这个限制，或者我需要去一些数据存档的方法？

标签： databasemongodbmongodb-queryubuntu-18.04

Answer 1

在查询末尾添加allowDiskUse并将其设置为 true，使其如下所示：

 db2.collection('candata')
.aggregate([{$sort:{time:-1}},{$group:{_id:{batteryId:"$batteryId"},soctime:{$first:"$time"},GPSStatus:{$first:"$GPSStatus"},CANStatus:{$first:"$CANStatus"},soc: { $first : "$socpercentage" },charging_status: { $first : "$charging_status" },status: { $first : "$status" }}},{$sort:{'_id.batteryId':1}},{$lookup:{from : "swap_table",localField : "_id.batteryId",foreignField:"batteryId",as:"swap"}},{$lookup:{from : "battery_status_table",localField : "_id.batteryId",foreignField:"batteryId",as:"battery_statustb"}}]).allowDiskUse(true)