```ruby
$:.unshift File.expand_path('../lib', File.dirname(__FILE__))

require 'rdb'

RDB::Reader.read_file('test/rdb/multiple_databases.rdb', callbacks: RDB::DebugCallbacks.new)
```

Fix rdb path in example.
user
```ruby
$:.unshift File.expand_path('../lib', File.dirname(__FILE__))

require 'rdb'

options = {
  callbacks: RDB::DebugCallbacks.new,
}

RDB::Reader.read_file('test/rdb/database_multiple_logical_dbs.rdb', options)
```
assistant