参考http://www.sosdb.com/article/datafile_block.htm
oracle8 9 的数据文件内部格式同理。
10.1.0~lgone@ONE.LG.OK> create table a(v varchar2(4000)) TABLESPACE t;
Table created.
10.1.0~lgone@ONE.LG.OK> insert into a values('a');
1 row created.
Start dump data blocks tsn: 17 file#: 5 minblk 10 maxblk 10
buffer tsn: 17 rdba: 0x0140000a (5/10)
//// buffer tsn:
数据文件对应的 tablespace 的 number 这只是dump文件中记录的数据而已
block 中是没有记录 tablespace 的 number 的
scn: 0x0000.0043890e seq: 0x05 flg: 0x02 tail: 0x890e0605
frmt: 0x02 chkval: 0x0000 type: 0x06=trans data
Block header dump: 0x0140000a
Object id on Block? Y
seg/obj: 0xd254 csc: 0x00.43890a itc: 2 flg: O typ: 1 - DATA
fsl: 0 fnx: 0x0 ver: 0x01
Itl Xid Uba Flag Lck Scn/Fsc
0x01 0x0004.00c.00001850 0x00801496.07b9.01 --U- 1 fsc 0x0000.0043890e
0x02 0x0000.000.00000000 0x00000000.0000.00 ---- 0 fsc 0x0000.00000000
data_block_dump,data header at 0x87e125c
//// data_block_dump,data header at 0x87e125c
其实这个block不是直接从 data buffer 中 dump 出来的这个表示真正dump时 block 的数据区的起始位置
也就是下面这部分开始的位置
=============== //// tsiz: hsiz: pbl: bdba: 在数据文件都是没有存储的
tsiz: 0x1fa0 //// Total data area size
8k的block: 8192-20(block head)-24(Transaction Header)-24*2(一个事务条)-4(block tail)=8096(0x1fa0)
hsiz: 0x14 //// Data header size 数据块头20个字节+数据块尾4个字节=24字节(0x14)
pbl: 0x087e125c //// Pointer to buffer holding the block
bdba: 0x0140000a
76543210
flag=--------
ntab=1
nrow=1
frre=-1
fsbo=0x14
fseo=0x1f9b
avsp=0x1f83
tosp=0x1f83
0xe:pti[0] nrow=1 offs=0
0x12:pri[0] offs=0x1f9b
block_row_dump:
tab 0, row 0, @0x1f9b
tl: 5 fb: --H-FL-- lb: 0x1 cc: 1
col 0: [ 1] 61
end_of_block_dump
End dump data blocks tsn: 17 file#: 5 minblk 10 maxblk 10
block 坏掉了还可以报:
ORA-600 (4519) Cache layer block type is incorrect
ORA-600 (4393) Check for Type for Segment header with free list
ORA-600 (4136) Check Rollback segment block
ORA-600 (4154) Check Rollback segment block
Ora-600[kcbzpb_1],[d],[kind],[chk] gets signaled when the block got corrupted in memory.
The only way it should be bad is if a stray store into memory destroyed the header or tail.
d = blocknumber, kind= kind of corruption detected,chk = checksum flag
ora-600[3398] and ora-600[3339]
ora-600[3398] is not in oracle 8.
ora-600[3398] means it failed a verification check before writing back to disk, so it must
be an in-memory corruption.
ora-600[3339] comes with ora-1578 and means either disk corruption or in memory corruption after read.
ora-600 [3339] has been removed from 7.2+
From 7.2+ ora-600 [3398] has become ora-600 [3374] with some checks added.
2进制存储格式
ALTER SESSION SET EVENTS '10289 trace name context forever, level 1';
ALTER SESSION SET EVENTS '10289 trace name context off';
[此贴子已经被作者于2007-1-31 8:50:04编辑过]
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Post By：2007-1-31 8:47:05
