High Water Mark

What is high water mark? Give an example where it can be useful ?

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Lokesh M

  • Dec 12th, 2011
 

High Water Mark (HWM) represents total number of extent blocks used by a table.
The value of High Water Mark could sometime be more then the actual size required/used by a table. This is because, some of these blocks of extents which at one point of time had data but was later deleted would become empty.

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