Does HEAP mean the same thing with a table that has Non-Clustered index?
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28-05-2021 - |
Question
In terms of SQL terminology, does HEAP stands for a table that has Non-Clustered index?
Or there is a nuance or it has completely a different meaning?
Solution
A heap can have either no index at all or a non-clustered index. But a clustered table can also have non-clustered indexs on top so -
does HEAP stands for a table that has Non-Clustered index?
is not a great definition as a table with a non-clustered index could be either a clustered table or a heap.
OTHER TIPS
A heap is a table without a clustered index. Simple as that!
A heap is a table without a clustered index. Heaps have one row in sys.partitions
, with index_id = 0
for each partition used by the heap. By default, a heap has a single partition. When a heap has multiple partitions, each partition has a heap structure that contains the data for that specific partition.