$sort will produce an error. To allow for the handling of large datasets, set the allowDiskUse option to true to enable $sort operations to write to temporary files. See the allowDiskUse option in db.collection.aggregate() method and the aggregate command for details.1...
然后在mongodb\cursor.js 854行,增加打印result。得到具体错误信息如下: Overflow sort stage buffered data usage exceeds in internal limit mongo执行sort语句时,内存最大32M,如果数据量大,超过这个限制就出抛出异常。 解决办法 1、给sort语句中的字段建立索引。 比如: sort({ endDate: -1, createTime: -1})...
Example: MongoDB: cursor.sort() method The following query, which returns all documents from the prod_master collection, does not specify a sort order: db.prod_master.find(); The query returns the documents in indeterminate prod_master: "_id" : 5, "item" : { "name" : "mango", "typ...
For MongoDB API drivers, refer to the language-specificMongoDB driver documentation. Specifies the order in which the query returns matching documents. You must applysort()to the cursor before retrieving any documents from the database. Thesort()method has the following parameter: ...
Thesort()method takes one parameter for "fieldname" and one parameter for "direction" (ascending is the default direction). ExampleGet your own Python Server Sort the result alphabetically by name: importpymongo myclient = pymongo.MongoClient("mongodb://localhost:27017/") ...
Unless you specify the sort() method or use the $near operator, MongoDB does not guarantee the order of query results. Ascending/Descending Sort Specify in the sort parameter the field or fields to sort by and a value of 1 or -1 to specify an ascending or descending sort respectively. ...
Method Detail values public static Sort[] values() Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows: for (Sort c : Sort.values()) System.out.println(c); Returns: an array ...
("进入到:mongodb查询"+startdate+" ; "+enddate+" ;"+sdkname); //接口接收的数据都为string,mongo日期查询时需要用date类型 SimpleDateFormat simp = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss"); try { //格式化string为date,引用"java.util.Date"包 ...
查阅mongo中文文档(https://mongodb.net.cn/manual/reference/method/cursor.sort/#sort-limit-results),得知此报错的原因是排序内容超越32MB的内存限制。 文档解释:当无法从索引获取排序顺序时,MongoDB将对内存中的结果进行排序,这要求所排序的结果集小于32 MB。
You can see that it works when you sort by an arbitrary field (x in the example above). It also works when using find instead of aggregate. In this case the sort operation never reaches the MongoDB(-driver) but is removed somewhere in between. This should also happen for an aggregation...