When an attribute is empty in a variable-length record, the null bitmap is utilised. It is possible for a tuple to have all or almost all of its properties set to null under unusual circumstances. If records are represented differently, the extra space used up by a null attribute might be reduced to a single bit.

CSC 472 Introduction to Database Systems Project Consider the hashing approach for computing aggregations. If the size of the hash table is too large to fit in memory, then the DBMS has to spill it to disk. During the Partition phase, a hash function h1 is used to split tuples into partitions on disk based on targethash key. During the ReHash phase, the DBMS can store pairs of the form (GroupByKey -> RunningValue) to computethe aggregation. Which of the following is FALSE ? Group of answer choices The Partition phase will put all tuples that match (using h1) into the same partition. To insert a new tuple into the hash table, a new (GroupByKey -> RunningValue) pair is inserted if it finds a matching GroupByKey. A second hash function (e.g., h2) is used in the ReHash phase. The RunningValue could be updated during the ReHash phase.

Why is an overflow block utilized in sequential file organization when there is only one overflow record at the moment?

What file extensions do razor views have?