Which database to select? [closed] - mysql

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I have used many databases like MySql,SqlServer2008,Oracle and Access in my projects but am confused which is efficient,scalable,less memory hungry and better speed across different platforms and environments.?
regards

Here is the comparison of all database:
Comparison_of_database
Now its depend on your requirement that which is good fit for you to use.

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How bootstrap is being used, step wise guide needed regarding which IDE and what are its benefits? [closed]

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I have to use bootstrap for front end development of my database, I am not sure how it will be used after download files and how the files will be updated according to my need?
I tried by downloading from bootstrap.com , but its not clear after downloading as I get html and css files. what will next steps?

hosting competition [closed]

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I have a complicated, multi-layered product/process that needs to be developed in SQL et al. I am considering hosting a competition with a significant prize or series of prizes. I am not connected to the industry whatsoever. How would I go about it and downfalls...or is it even doable? Are there organizations that host competitions etc.
Codechef, HackerRank, HackerEarth, all of these host competitions on demand. Search for more info about them online

Do I need MySQL even though there is no user registration on my website? [closed]

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I have made a website which does some calculations, so there is no user registration. Just a website where people can do their calculations and leave. However, do I need MySQL as part of the server? I am a bit confused on this.
MySQL (and other database engines like PostgresQL, MongoDB, and even Google's BigTable) are used for storing data outside of user sessions. If you have no need to persist data, then you have no need for a database.

What are the differences between REST.JsonReflect and Data.DBXJSONReflect? [closed]

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Delphi introduced a new JSON marshaler in unit REST.JsonReflect, a similar JSON marshaler exists in unit Data.DBXJSONReflect. Both units introduce TJSONConverters to create TJSONMarshal and TJSONUnMarshal instances.
what are the differences between REST.JsonReflect.TJSONConverters and Data.DBXJSONReflect.TJSONConverters?
will REST.JsonReflect.TJSONConverters replace Data.DBXJSONReflect.TJSONConverters?
are there any situations where I should use Data.DBXJSONReflect.TJSONConverters instead of REST.JsonReflect.TJSONConverters?

Configuration parameters in file or DB? [closed]

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What will be best practice for this?
I'd say it depends a lot on what you are going to use it for, how often it's going to be changed, etc. For the most part I keep configuration parameters that are unlikely to change in a file (ie: db connection parameters themselves)