B树索引

#####内部结构 将B树索引转储成树状结构的形式而呈现出来： alter session set events 'immediate trace name treedump level INDEX_OBJECT_ID'; SQL> alter session set events 'immediate trace name treedump level 126545'; Session altered. [oracle@hzvscmdb trace]$ pwd /home/oracle/app/oracle/diag/rdbms/tonytest/tonytest/trace [oracle@hzvscmdb trace]$ vi tonytest_ora_5439.trc ----- begin tree dump branch: 0x34000e3 54526179 (0: nrow: 444, level: 1) leaf: 0x34000e4 54526180 (-1: nrow: 393 rrow: 393) leaf: 0x34000e5 54526181 (0: nrow: 377 rrow: 377) leaf: 0x34000e6 54526182 (1: nrow: 378 rrow: 378) leaf: 0x34000e7 54526183 (2: