innodb_ruby
A Ruby library and set of tools that parse InnoDB file formats, built to expose and teach the on-disk internals of InnoDB.
innodb_ruby reads InnoDB’s on-disk structures directly, which makes it useful for learning how pages, records, and indexes are laid out and for demonstrating those structures interactively from irb. Its README is explicit that it’s a learning and teaching tool rather than something for critical production use.
It’s written by Jeremy Cole, distributed as a Ruby gem, and released under the 3-clause BSD license.
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