# Package org.apache.cassandra.db.lifecycle

- Class Summary
  Class | Description
  --- | ---
  LifecycleTransaction |
  LifecycleTransaction.ReaderState |
  SSTableIntervalTree |
  Tracker | Tracker tracks live `View` of data store for a table.
  View | An immutable structure holding the current memtable, the memtables pending flush, the sstables for a column family, and the sstables that are active in compaction (a subset of the sstables).

- Enum Summary
  Enum | Description
  --- | ---
  LifecycleTransaction.ReaderState.Action |

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