but I can only list the valid row entries, but cannot construct the data, it seems version relative, because in the dump file from "ALTER SYSTEM DUMP DATAFILE xxx BLOCK xxx" , we can find the followng information. data_block_dump,data header at 0x44b0274 =============== tsiz: 0x1f88 hsiz: 0x5be pbl: 0x044b0274 bdba: 0x010000d2 76543210 flag=-0------ ntab=2 nrow=717 frre=-1 fsbo=0x5be fseo=0x1161 avsp=0x8f tosp=0x8f r0_9ir2=0x0 mec_kdbh9ir2=0x4 76543210 shcf_kdbh9ir2=---------- 76543210 flag_9ir2=--R----C fcls_9ir2[3]={ 0 32768 32768 } 0x1c:pti[0] nrow=8 offs=0 0x20:pti[1] nrow=709 offs=8 -- Welcome, Fangxin.Lou from China Home: http://www.anysql.net/en/ Mydul: http://www.anysql.net/en/mydul.html