THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
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- Ordered sequence of def~timeline-metadata about all the write operations done on the table, akin to a database transaction log.
- Set A hierarchical layout of a set of def~data-files that actually contain the records that were written to the table.
- An def~index (which could be implemented in many ways), that maps a given record to a subset of the data-files that contains the record.
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