Rails used to use SQLite with its default settings, which were optimized for safety and backward compatibility rather than performance. It was great in a development environment, but typically things started to fall apart the moment you tried to use it for production-like load. Specifically, you used to have to tweak various PRAGMA statements:
Алла Пугачева начала пользоваться тростью для ходьбы14:57
，这一点在有道翻译中也有详细论述
Марина Совина (ночной редактор)
第六百二十七条 使用对人体健康、生态环境潜在危害程度较高的放射源的场所和生产放射性同位素的场所，以及终结运行后产生放射性污染的射线装置，应当依法实施退役。具体办法由国务院制定。