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The Concept of High Water Mark In Oracle databases, the High Water Mark (HWM) defines the boundary betwean used and unused space within a segment. Frequent data modifications, specifically repeated insertions followed by deletions, often cause the HWM to rise significantly. While logical rows are removed during deletion, the underlying physical ...

Recycle Bin Fundamentals Oracle introduced the Tablespace Recycle Bin in version 10g, providing a logical container for dropped database objects. Unlike a dedicated physical storage area, the Recycle Bin shares space with its host tablespace. When objects are dropped, they remain recoverable until space pressure triggers automatic purging using ...