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Background documentation Table Access (UPDATE) Using B* Tree Locate the document in its SAP Library structure

Table Access Using B* Tree is illustrated using the example of an UPDATE statement.

·        If an UPDATE is performed and the primary key  remains unchanged, only the contents of the table row are changed.

·        If the data length changes, the positions of subsequent entries and their addresses in the position list of the leaf page in the B* tree  are changed.

·        If the key field changes, the UPDATE is executed as a DELETE (Table Access (DELETE) Using B* Tree) with a subsequent INSERT (Table Access (INSERT) Using B* Tree).

 

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