Shards, RecordIDs, Main Storage, Delta Storage

• Datasets of a table are organized in shards of roughly 60,000 items
• Inside a shard with n items, the datasets are numbered from 0..n-1
• The first few datasets of each shard are organized in a column store
• The rest of the datasets are organized in a row store
• The delta store consists of the insert list as well as the deletion mask