MongoDB Delete Operations: How to Safely Delete Collections and Documents?

MongoDB provides two types of deletion operations: document deletion and collection deletion, with secure operations to prevent data loss. For document deletion, `deleteOne()` (deletes the first matching document) and `deleteMany()` (deletes all matching documents) are available. It is mandatory to use `find()` to confirm the conditions before performing these operations; blind execution is strictly prohibited. For collection deletion, the `drop()` method is used, which deletes the entire collection (including documents and indexes). Ensure the collection name is correct and there are no dependencies; verify the collection with `show collections` before the operation. Security principles include: querying and previewing before deletion, avoiding unconditional deletion (e.g., `deleteMany({})`), backing up important data in advance, and using `writeConcern` when necessary to ensure reliable writes. The core steps are: clarifying the target, querying before deletion, and checking backups, which can maximize the prevention of data loss due to misoperations.