cluster different rowid

Hi, I have two tables t01 and t02 both of them have the id column that the cluster column. But some same IDs have different rowid (data block address) why? What is a reason could explain you?

Select a.id, b.id, a.rowid rowid01, b.rowid rowid02 t01, t02-b where a.id = b.id order by a.id

ID ID ROWID01 ROWID02

---------- ---------- ------------------ ------------------

1 1 AAAXFMAAGAAAADjAAA AAAXFMAAGAAAADjAAA

2 2 AAAXFMAAGAAAADjAAB AAAXFMAAGAAAADjAAB

3 3 AAAXFMAAGAAAADjAAC AAAXFMAAGAAAADjAAC

4 4 AAAXFMAAGAAAADjAAD AAAXFMAAGAAAADjAAD

5 5 AAAXFMAAGAAAADjAAE AAAXFMAAGAAAADjAAE

6 6 AAAXFMAAGAAAADjAAF AAAXFMAAGAAAADjAAF

7 7 AAAXFMAAGAAAADjAAG AAAXFMAAGAAAADjAAG

8 8 AAAXFMAAGAAAADjAAH AAAXFMAAGAAAADjAAH

9 9 AAAXFMAAGAAAADjAAI AAAXFMAAGAAAADjAAK

10 10 AAAXFMAAGAAAADjAAJ AAAXFMAAGAAAADjAAJ

11 11 AAAXFMAAGAAAADjAAK AAAXFMAAGAAAADjAAI

11 selected lines.

The rowid is a method to treat a row in a table. Internal components must be hidden, you shouldn't care about them.

To understand this, just assume the rowid is something like the physical address of the database. It seems that t02 stores its rows in order physics 1,2,3,4,5,6,7,8,11,10,9. Which would explain the difference, you have observed?

Tags: Database

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