MySQL™: The World’s Most Popular Open Source Database 181 ibdata Data File Structure Tablespace Segment (“file”) Leaf node segment 1M extent 1M extent Leaf node segment 1M extent 1M extent Non-leaf node N-l ns Extent segment Rollback segment Page Row Row Row 64 pages 16 kB each Transaction id 6 B Row Row Row Roll pointer 7 B Field pointers n x 1-2 B Field 1 Field 2 Field n Copyright 2003 MySQL AB