一次對Block的 Dump過程
2024-07-21 02:35:40
供稿：網(wǎng)友
代碼:--------------------------------------------------------------------------------
SQL> create table t9 (a varchar(10));
Table created.
SQL> insert into t9 values('a');
1 row created.
SQL> commit;
Commit complete.
SQL> set serveroutput on
SQL> exec show_space('T9');
Free Blocks.............................1
Total Blocks............................8
Total Bytes.............................65536
Unused Blocks...........................6
Unused Bytes............................49152
Last Used Ext FileId....................3
Last Used Ext BlockId...................121
Last Used Block.........................2
PL/SQL PRocedure sUCcessfully completed.
SQL> alter system dump datafile 3 block 122;
System altered.
SQL> select * from v$tablespace;
TS# NAME INC
---------- ------------------------------ ---
0 SYSTEM YES
1 UNDOTBS1 YES
8 USERS YES
18 TEMP1 --------------------------------------------------------------------------------
Trace 文件：
*** 2004-07-25 15:48:01.000
Start dump data blocks tsn: 8 file#: 3 minblk 122 maxblk 122
buffer tsn: 8 rdba: 0x00c0007a (3/122)
scn: 0x0000.0068d716 seq: 0x01 flg: 0x02 tail: 0xd7160601
frmt: 0x02 chkval: 0x0000 type: 0x06=trans data
Block header dump: 0x00c0007a
Object id on Block? Y
seg/obj: 0x806d csc: 0x00.68d714 itc: 2 flg: O typ: 1 - DATA
fsl: 0 fnx: 0x0 ver: 0x01
Itl Xid Uba Flag Lck Scn/Fsc
0x01 0x0004.00b.00000fac 0x00801885.008c.56 --U- 1 fsc 0x0000.0068d716
0x02 0x0000.000.00000000 0x00000000.0000.00 ---- 0 fsc 0x0000.00000000
data_block_dump,data header at 0x552105c
===============
tsiz: 0x1fa0
hsiz: 0x14
pbl: 0x0552105c
bdba: 0x00c0007a
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: 8 file#: 3 minblk 122 maxblk 122
