Method iterator

src/java/simpledb/storage/DbFile.java:74–74

Returns an iterator over all the tuples stored in this DbFile. The iterator must use BufferPool#getPage, rather than #readPage to iterate through the pages. @return an iterator over all the tuples stored in this DbFile.

(TransactionId tid)

     * @return an iterator over all the tuples stored in this DbFile.
     */
    DbFileIterator iterator(TransactionId tid);

    /**
     * Returns a unique ID used to identify this DbFile in the Catalog. This id