The Catalog
    in-Memory Catalog
        Collection Catalog
            (include discussion of RecordStore interface)
        Index Catalog
            (include discussion of SortedDataInferface interface)
        Versioning
            (in memory versioning (or lack thereof) is separate from on disk)
            The Minimum Visible Snapshot
    On-Disk Catalog
        Catalog Data Formats
            Collection Data Format
            Index Data Format
        Versioning
            (e.g. data changes in tables are versioned, dropping/creating tables is not versioned)
    Catalog Changes
        (How are updates to the catalog done in-memory and on disk?)
    Two-Phase Collection and Index Drop
        (First phase removes access to the collection/index in the in-memory catalog, second phase drops the WT table.)
        (Explain this is necessary because WT versions document writes but not table drops.)
        (Necessary to support ongoing queries, repl ops like rollback, and our own startup recovery.)