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I am trying to learn using databases correctly by myself and now I realised, that although I have used these concepts before, I don’t really know what’s the difference between them:
What is a transaction?
What is a lock?
As far as I know, when using a transaction, all instructions are executed as one, so another user can not interfere. So why would I use a lock in this case?
When should I use locking and when transactions?
I am using MySQL, if it matters…
Transactions are used when you are executing queries and wish to have a mechanism to reverse the resulting modifications if there is a possibility of error during their execution.
Locking in mysql is used to gain exclusive mode to certain table and perform much faster insert/delete queries, most often for bulk data upload into a heavy usage database.