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python - use of cursors in pymongo

Problem: I need to use the same cursor multiple times. Then I found that the cursor in a for loop was useless....

From [MongoDBdiscussion group] 2017-05-17 10:04:06 0  1  1288

Mongodb limited query return field query is slower?

When I directly use find to return all fields, the results are as follows. The query time is 155. If I limit t...

From [MongoDBdiscussion group] 2017-05-17 10:04:05 0  1  974

In mongodb, some values ??in mapReduce are not processed by reduce.

When using mapReduce in mongodb, some values ??are not processed by reduce, which is very confusing. First go ...

From [MongoDBdiscussion group] 2017-05-17 10:04:04 0  1  724

mongodb - Do I need to buy a database for my personal blog?

I use mongodb in my personal blog project. Do I need to purchase the cloud database mongodb to publish it onli...

From [MongoDBdiscussion group] 2017-05-17 10:04:03 0  8  1028

mongodb - Can mongoose query the value of the corresponding key of the document object?

The document information is shown in Figure 2. When I query through Figure 1, I get undefined. Why?

From [MongoDBdiscussion group] 2017-05-17 10:04:00 0  2  904

How to use client tools to manage the self-built mongodb database on Tencent Cloud host. The ports are blocked. What should I do?

It’s very expensive to buy their mongo database separately. I just installed it on the cloud host and it can’t...

From [MongoDBdiscussion group] 2017-05-17 10:03:57 0  2  811

mongodb - pymongo count is slow

Thirty thousand pieces of data, each piece of data only contains a random number {"digit": random nu...

From [MongoDBdiscussion group] 2017-05-17 10:03:55 0  1  1335

mongodb - what does mysql thread mean?

For example, when I open a website, how do I understand its connection thread? What are multi-threading and mu...

From [MongoDBdiscussion group] 2017-05-17 10:03:51 0  1  890

Mongodb plug-in problem in webstorm

The database is read-only and cannot be added, deleted, modified or checked in the GUI. Do I need to do some c...

From [MongoDBdiscussion group] 2017-05-17 10:03:34 0  1  852

mongodb - python mongo findAndModify how to limit quantity

There is a query parameter and an update tag in findAndMondify, but how to limit the number of searches is to ...

From [MongoDBdiscussion group] 2017-05-17 10:03:22 0  1  1030

mongodb - How to add or remove documents to array properties in mongoose?

Like the example below, if I want to add or delete documents to the lists array, what should I do? Thanks! {co...

From [MongoDBdiscussion group] 2017-05-17 10:03:17 0  1  791

mongodb 3.4 How to use the java language to operate the aggregate function. Beginners, please give me some advice.

Does a DBObject whose aggregate parameter type is Bson need to inherit the Bson type? Can you provide a comple...

From [MongoDBdiscussion group] 2017-05-17 10:03:15 0  1  804

mongodb - How does mongoose query data based on the id of a subdocument?

{Code...} Like this example, if I want to find a subdocument based on its id: "_id": "590ad2d78...

From [MongoDBdiscussion group] 2017-05-17 10:03:14 0  2  810

Frequent unresponsiveness when operating MongoDB database in command line tool

As shown in the picture above, the operation of the part selected in the red box does not respond, but the ope...

From [MongoDBdiscussion group] 2017-05-17 10:03:08 0  3  823

mongoose how to get all collection

I need to count all the collections in the data, which collection contains the most data, and how to deal with...

From [MongoDBdiscussion group] 2017-05-17 10:03:06 0  2  837