/* Package bolt implements a low-level key/value store in pure Go. It supports fully serializable transactions, ACID semantics, and lock-free MVCC with multiple readers and a single writer. Bolt can be used for projects that want a simple data store without the need to add large dependencies such as Postgres or MySQL. Bolt is a single-level, zero-copy, B+tree data store. This means that Bolt is optimized for fast read access and does not require recovery in the event of a system crash. Transactions which have not finished committing will simply be rolled back in the event of a crash. The design of Bolt is based on Howard Chu's LMDB project. Basics There are only a few types in Bolt: DB, Bucket, Transaction, and Cursor. The DB is a collection of buckets and is represented by a single file on disk. A bucket is a collection of unique keys that are associated with values. Transactions provide a consistent view of the database. They can be used for retrieving, setting, and deleting properties. They can also be used to iterate over all the values in a bucket. Only one writer Transaction can be in use at a time. Caveats The database uses a read-only, memory-mapped data file to ensure that applications cannot corrupt the database, however, this means that keys and values returned from Bolt cannot be changed. Writing to a read-only byte slice will cause Go to panic. If you need to alter data returned from a Transaction you need to first copy it to a new byte slice. Bolt currently works on Mac OS and Linux. Windows support is coming soon. */ package bolt