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i have some questions regarding linq to sql with c#. hope you can help...
Does creating Data base new DataContext load the entire DB to local cache every time?
If the answer is yes, Is there a way to Load Only the required part of the DB(with Querys Or Stored procedures maybe) to do so ?
3.Does Linq To Enteties is more suitable for this requirements ?
1/ No, it does not load anything from the Database untill the query is executed
2/ ...
3/ You can load the entire database in Cache if you want to. BUt that has nothing to do with Linq-2-entities or Linq-2-sql. You can do it with either technology.
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I was wondering how MySQL (and other databases for that matter) work under the hood. Do they use standard C I/O calls like fseek to find a record?
Here is the link to the source code. From a quick review of the file I can confirm that there are multiple check that is been done before and after an insert. It's actually a great idea to review the whole file very interesting.
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I am participating in an project that using MongoDB as the datasorce instead of MySQL. The project is an APP for live-streaming with large amount of data and frequent IO. I am not sure if MongoDB is better than MySQL in this scenario.
Very likely no. MongoDB would excel in cases where you have hierarchical data in several levels and an arbitrary structure. If your data falls naturally into columns and tables then MySQL would likely trounce MongoDB.
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I've webhook, which is hitting with multiple entries on my function. Sometime when there are 10 to 15 request, the database insert and update query is missing.
There could be many solutions like :-
Add Queuing system, on api request add job in queue response back & let queue add to database.
Use what databases do, they add to file and then from file they push to database.
There could be many other solutions and also maybe above 2 may not work for you perfectly, which solution to choose depends upon what you are doing
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I want to create a new rails application and I'm not sure whether to use MySQL or Postgres. Which one is best and what is the difference between them?
UPDATE:
The project is a health-care project. It may contain more than 500 tables.
postgres is secure, fast, and full of features but comparatively tricky to use.
MySql has its own benefits along with large user community and vast materials. Immensely helpful if you ever get stuck.
But ultimately it all comes to your preference and framework (apart from rails if your app requires any) support.
Read this for detailed comparison and insights: http://wiki.postgresql.org/wiki/Why_PostgreSQL_Instead_of_MySQL%3a_Comparing_Reliability_and_Speed_in_2007
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I have to copy tables from one database on Azure to another which is on our virtual server there on Azure. Importing is not working. What would be the way to make this. The other issue is some of the tables have different columns can I copy matched columns only? this is sql servers.
SQL-Azure does not support USE statement and effectively no cross-db queries.
If you want to copy/backup the db to another sql azure db you can use the "Same-server" copying or "Cross-Server" copying in SQL-Azure. Refer this msdn article