Dear Gurus,
I have been reading the concepts carefully to understand each and every point (as a beginner). I am stuck in one place, the concepts (Chapter 2 Overview of Data Blocks)
The paragraph says:
Although you can allocate additional extents, the blocks themselves are allocated separately.
If you allocate an extent to a specific instance, the blocks are immediately allocated to the free list.
However, if the extent is not allocated to a specific instance, then the blocks themselves are allocated only when the high water mark moves.
The high water mark is the boundary between used and unused space in a segment.
I could not understand what is Freelist and what is High Water Mark. As a beginner I was asked to start with Oracle concepts and I could not comprehend this information. Can some experts help?
Thanks
Neel