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I want to use Redis in Magento instead of mysql? I do like how to done it?
Good day.
Redis is not a replacement MySQL.
If you you want to use NoSQL with Magento, you must choose DB with guarantee the preservation to Storage
For Example - MongoDB
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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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can one get back a data that has been deleted from a database? if it is possible how can it be done?
Oracle
If you have not COMMITted the DELETE then you can use ROLLBACK.
If you have COMMITted the DELETE and you have FLASHBACK turned on then you can restore it to a previous point before the DELETE.
If neither of those work then you will be relying on backups.
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I'm using Symfony 2.7 and Mysql
I need to load some real data to database like needed data for countries and cities tables and their relations. What is the right way to do such tasks in Symfony?
For generating test data, use data fixtures. For generating data required in productions, I suggest to use migrations.
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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.