mongodb使用find查询获取的游标是否可以遍历出查询执行后的数据库新增的记录

mongodb使用find查询返回的游标，是否可以遍历出查询执行后(记录比较多查询时间比较长，此时查询还未执行完)数据表新增的记录。 例如： 线程A在时间点t1使用find查询数据表user返回游标，遍历数据记录。 线程...

From [MongoDBdiscussion group] 2017-04-24 16:00:18 0  2  1148

The MongoDB database has not been accessed for a long time, and the first query takes a long time. How to solve it?

I encountered a MongoDB problem in the project, and I still haven't been able to solve it after many days. I h...

From [MongoDBdiscussion group] 2017-05-02 09:26:08 0  1  1147

mongodb - spring-data-mongo aggregate filters two fields equal

When using spring-data-mongo to do statistics, you need to compare whether two fields are equal. For example, ...

From [MongoDBdiscussion group] 2017-05-02 09:23:59 0  0  1145

mongodb - Exceeded memory limit for $group

Exceeded memory limit for $group, but didn't allow external sort. Pass allowDiskUse:true to opt in {代码...}

From [MongoDBdiscussion group] 2017-05-02 09:21:28 0  1  1142

mongodb 用户点赞功能怎么设计比较合理？

假设用户为文章点赞，点赞操作是可以取消的。 用户和文章应该是多对多的关系，我看了一下 mongodb 官网上面的 一对多的实例，像它这样在 多 的一方添加 一 的 id，应该是比较适合那种建立了就不会轻易发生改变的...

From [MongoDBdiscussion group] 2017-04-24 09:11:52 0  2  1139

node - mongodb database design mongoose schema

Order table design in a trading scenario: Suppose there are four products. The order data of each product must...

From [MongoDBdiscussion group] 2017-06-16 09:19:06 0  3  1125

Link MongoDB Error: mongodb network is unreachable How to solve?

Yesterday the link was still working, but today the link reported an error. I tried various methods on Baidu b...

From [MongoDBdiscussion group] 2017-05-02 09:25:55 0  1  1117

Database - How should a limited-time history table be designed?

The database is MongoDB. Suppose there is a data table (data collection-collection) --- Users. Every time a us...

From [MongoDBdiscussion group] 2017-05-31 10:36:04 0  2  1115

linux - Problem with logging in using mongodb permissions after installing ubuntu mongodb apt

I received a text message notification from Alibaba Cloud in the middle of the night yesterday, saying that th...

From [MongoDBdiscussion group] 2017-05-02 09:26:31 0  1  1109

mongodb - Requirements for statistical query of mongoose related tables

I want to ask a question about mongodb (mongoose). A blog has two tables, articles and tags, a many-to-many re...

From [MongoDBdiscussion group] 2017-05-02 09:24:37 0  2  1107

mongodb 修改字段类型， 现在集合中有一个字段是string，要修改为date类型， 怎么弄 ？

mongodb 修改字段类型， 现在集合中有一个字段是string，要修改为date类型， 怎么弄 ？

From [MongoDBdiscussion group] 2017-05-02 09:19:22 0  3  1098

How to merge multiple databases in mongodb

Now there are DBA, DBB, DBC, and NewDB in an instance. How to import ABC into NewDB? The structure is the same...

From [MongoDBdiscussion group] 2017-06-21 10:11:34 0  1  1096

mongodb拼音排序的最佳实践

网上搜了半天，似乎没有找到mongodb默认对中文拼音排序的支持。那么在mongo中，对中文进行排序的方案有哪些，最佳实践是什么？

From [MongoDBdiscussion group] 2017-04-28 09:03:33 0  2  1094

How to explain Mongodb's compound (combination) query?

Mongodb version: v3.4 {code...} When using {code...} explain('executionStats') {code...} Like the above exampl...

From [MongoDBdiscussion group] 2017-05-17 10:01:57 0  1  1091

mongodb _id rename

I am new to mongodb. How do I rename the _id of an entry?

From [MongoDBdiscussion group] 2017-06-16 09:19:03 0  3  1089