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A bucket is\na collection of unique keys that are associated with values.\n\nTransactions provide either read-only or read-write access to the database.\nRead-only transactions can retrieve key/value pairs and can use Cursors to\niterate over the dataset sequentially. Read-write transactions can create and\ndelete buckets and can insert and remove keys. Only one read-write transaction\nis allowed at a time.\n\nThe database uses a read-only, memory-mapped data file to ensure that\napplications cannot corrupt the database, however, this means that keys and\nvalues returned from Bolt cannot be changed. Writing to a read-only byte slice\nwill cause Go to panic.\n\nKeys and values retrieved from the database are only valid for the life of\nthe transaction. 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