-- Row Directory data_block_dump,data header at 0x3051074 =============== tsiz: 0x1f88 hsiz: 0x22 pbl: 0x03051074 bdba: 0x02c000e2      76543210 flag=-------- ntab=1 nrow=8 frre=-1 fsbo=0x22 fseo=0x1ec0 avsp=0x1f1e tosp=0x1f1e 0xe:pti[0] nrow=8 offs=0 0x12:pri[0]   offs=0x1eff 0x14:pri[1]   offs=0x1ef6 0x16:pri[2]   offs=0x1eed 0x18:pri[3]   offs=0x1ee4 0x1a:pri[4]   offs=0x1edb 0x1c:pri[5]   offs=0x1ed2 0x1e:pri[6]   offs=0x1ec9 0x20:pri[7]   offs=0x1ec0

tsiz: total data area size

hsiz: data header size

pbl: point to buffer holding the block

bdba: rdba，与 Header 中的 rdba 相同。

flag：n=pctfree hit(clusters); f=do not put on freelist;k=flushable cluster keys

ntab：number of tables (>1 in clusters)

nrow：number of rows

frre：first free row index entry;-1=you have to add one

fsbo：free space begin offset

fseo：free space end offset

avsp：available space in the block

tosp：total available space when all txs commit

（参考冰冻奶茶的DATA BLOCK内部结构）