What is a table called, if it has neither Cluster
nor Non-cluster Index? What is it used for?
Unindexed table or Heap.
Microsoft Press Books and Book on Line (BOL)
refers it as Heap.
A heap is a table that does not have a clustered index and,
therefore, the pages are not linked by pointers.
The IAM pages are the only
structures that link the pages in a table together.
Unindexed tables are good
for fast storing of data.
Many times it is better to drop all indexes from
table and then do bulk of inserts and to restore those indexes after that.
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