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== Introduction ==
Many Firefox developers see SQLite as a default choice for storing any non-trivial amount of data, and this wiki explains why that view is incorrect.
SQLite may seem like a very appealing option when first designing a feature. It offers the familiar and powerful SQL language, our codebase has nice C++ and JavaScript APIs for it, and it's already used in many places in the codebase. However, when choosing storage formats, we have to keep in mind that SQLite is a powerful and reliable database and that it comes with a lot of '''hidden complexity'''. It's very tempting to take the abstractions it offers at face value and to ignore the complexity happening under the hood. As a result, we have repeatedly seen SQLite become a source of performance problems. This isn't an indictment of SQLite itself -- any other relational embedded DB would pose the same challenges.
