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Why mongoDB takes less time for Select than Fetch time?


Why mongoDB takes less time for Select than Fetch time?

By : Sameh Kaddoura
Date : November 19 2020, 03:59 PM
fixed the issue. Will look into that further MongoDB uses lazy evaluation with cursors. That means in many cases when you start a MongoDB query which returns a cursor, the query doesn't get executed yet.
The actual selection happens when you start requesting data from the cursor.
code :


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Join on 3 different table takes time to fetch data

Join on 3 different table takes time to fetch data


By : Ajmal Va
Date : March 29 2020, 07:55 AM
this one helps. In this case, you can use column indexes in the table. Following links point to as to how to create the indexes in Sqlite database.
creating the index Same question answered here.
mongoDB references fetching takes time

mongoDB references fetching takes time


By : Сергей Кондратьев
Date : March 29 2020, 07:55 AM
To fix the issue you can do You should use the select_related flag when querying if you want to get all the references quickly. Please note reference lookups will cost extra queries and select_related() is designed to reduce the number of round trips to mongodb.
code :
# Single document lookup
document_of_A.select_related(2)

# Queryset
A.objects.select_related(2)
It takes long time to fetch images (Objective-C)

It takes long time to fetch images (Objective-C)


By : user3870560
Date : March 29 2020, 07:55 AM
Hope that helps Images are stored in Core Data as raw blocks of data. The data is the same as when you convert UIImages to NSDatas. This can result very quickly in a LOT of data being stored in your database, which has to be fetched and de-serialised, hence why it can be slow.
In terms of speed, here's a few things you might want to think about and read up on:
MongoDB : Kill all tasks in mongoDB that takes too long and exceeds certain wait-time

MongoDB : Kill all tasks in mongoDB that takes too long and exceeds certain wait-time


By : fesq
Date : March 29 2020, 07:55 AM
it fixes the issue I have gone through all the documentations, there is no way we can implement it. The thing is maxTimeMS is implemented for each query but not on the Global URI level.
Mongodb file allocator takes more time

Mongodb file allocator takes more time


By : James Shimota
Date : March 29 2020, 07:55 AM
To fix the issue you can do Windows Answer
The most obvious issue which could apply here is if you are using Windows 7 or Windows Server 2008. An issue (SERVER-8480) with those operating systems, which can be fixed by applying this hotfix means that the data files being allocated by MongoDB must be filled with zeroes.
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