使用events DUMP buffer cache中指定的資料塊

介紹了DUMP  buffer cache中全部資料塊及指定RDBA的資料塊方法。

1.DUMP  buffer cache中全部資料塊

ALTER SESSION SET EVENTS ‘immediate trace name buffers level n’;

1 buffer header

2 level 1 + block header

3 level 2 + block contents

4 level 1 + hash chain

5 level 2 + hash chain

6 level 3 + hash chain

8 level 4 + users/waiters

9 level 5 + users/waiters

10 level 6 + users/waiters

###############################

2.DUMP  buffer cache中指定RDBA的資料塊方法

[email protected] bys3>select dbms_rowid.rowid_relative_fno(rowid) fileid,dbms_rowid.rowid_object(rowid) obj#,dbms_rowid.rowid_block_number(rowid) block#,deptno from dept;

    FILEID       OBJ#     BLOCK#     DEPTNO

---------- ---------- ---------- ----------

         4      22327        251         10

         4      22327        251         20

         4      22327        251         40

         4      22327        251         99

[email protected] bys3>select dbms_utility.make_data_block_address(4,251) from dual;    --使用此函數算出rdba--就是rowid中的rfile#+block#

DBMS_UTILITY.MAKE_DATA_BLOCK_ADDRESS(4,251)

-------------------------------------------

                                   16777467

[email protected] bys3>alter session set events 'immediate trace name set_tsn_p1 level 5';    --這裡的5是表空間号加1得到的。也就是TS#+1。select ts#,name from v$tablespace;

Session altered.

[email protected] bys3>alter session set events 'immediate trace name buffer level 16777467';

Session altered.

[email protected] bys3>select value from v$diag_info where name like 'De%';

VALUE

---------------------------------------------------

/u01/diag/rdbms/bys3/bys3/trace/bys3_ora_21011.trc

###########################

3.檢視TRACE檔案--就先不解讀了

[[email protected] ~]$ cat /u01/diag/rdbms/bys3/bys3/trace/bys3_ora_21011.trc

Trace file /u01/diag/rdbms/bys3/bys3/trace/bys3_ora_21011.trc

Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - Production

With the Partitioning, OLAP, Data Mining and Real Application Testing options

ORACLE_HOME = /u01/app/oracle/product/11.2.0/dbhome_1

System name:    Linux

Node name:      bys3.bys.com

Release:        2.6.32-200.13.1.el5uek

Version:        #1 SMP Wed Jul 27 20:21:26 EDT 2011

Machine:        i686

Instance name: bys3

Redo thread mounted by this instance: 1

Oracle process number: 17

Unix process pid: 21011, image: [email protected] (TNS V1-V3)

*** 2013-12-20 13:22:53.896

*** SESSION ID:(35.1461) 2013-12-20 13:22:53.896

*** CLIENT ID:() 2013-12-20 13:22:53.896

*** SERVICE NAME:(SYS$USERS) 2013-12-20 13:22:53.896

*** MODULE NAME:(SQL*Plus) 2013-12-20 13:22:53.896

*** ACTION NAME:() 2013-12-20 13:22:53.896

Dump of buffer cache at level 10 for tsn=4 rdba=16777467

BH (0x20ff065c) file#: 4 rdba: 0x010000fb (4/251) class: 1 ba: 0x20e1a000

  set: 3 pool: 3 bsz: 8192 bsi: 0 sflg: 1 pwc: 0,0

  dbwrid: 0 obj: 22327 objn: 22327 tsn: 4 afn: 4 hint: f

  hash: [0x21be851c,0x2bbfddf4] lru: [0x21fe8100,0x21ff6c78]

  lru-flags: hot_buffer

  ckptq: [NULL] fileq: [NULL] objq: [0x21fe8118,0x246ea304] objaq: [0x21fe8120,0x246ea2fc]

  st: XCURRENT md: NULL fpin: 'kdswh01: kdstgr' tch: 0

  flags: only_sequential_access

  LRBA: [0x0.0.0] LSCN: [0x0.0] HSCN: [0xffff.ffffffff] HSUB: [65535]

  buffer tsn: 4 rdba: 0x010000fb (4/251)

  scn: 0x0000.00359e7e seq: 0x01 flg: 0x04 tail: 0x9e7e0601

  frmt: 0x02 chkval: 0x8cd6 type: 0x06=trans data

Hex dump of block: st=0, typ_found=1

Dump of memory from 0x20E1A000 to 0x20E1C000

20E1A000 0000A206 010000FB 00359E7E 04010000  [........~.5.....]

20E1A010 00008CD6 00000001 00005737 00359E7E  [........7W..~.5.]

20E1A020 00000000 00320003 010000F8 00050008  [......2.........]

20E1A030 0000097B 00000000 00000000 0000A000  [{...............]

20E1A040 00359171 00000000 00000000 00000000  [q.5.............]

20E1A050 00000000 00000000 00000000 00000000  [................]

        Repeat 1 times

20E1A070 00000000 00000000 00000000 00040100  [................]

20E1A080 001AFFFF 1F0E1F28 00001F0E 1F280004  [....(.........(.]

20E1A090 1F581F42 00001F70 00000000 00000000  [B.X.p...........]

20E1A0A0 00000000 00000000 00000000 00000000  [................]

        Repeat 495 times

20E1BFA0 00000000 0203002C 410A0BC1 554F4343  [....,......ACCOU]

20E1BFB0 4E49544E 454E0847 4F592057 002C4B52  [NTING.NEW YORK,.]

20E1BFC0 15C10203 53455208 43524145 41440648  [.....RESEARCH.DA]

20E1BFD0 53414C4C 0203002C 4F0A29C1 41524550  [LLAS,....).OPERA]

20E1BFE0 4E4F4954 4F420653 4E4F5453 0203002C  [TIONS.BOSTON,...]

20E1BFF0 630664C1 61646568 6A62026E 9E7E0601  [.d.chedan.bj..~.]

Block header dump:  0x010000fb

 Object id on Block? Y

 seg/obj: 0x5737  csc: 0x00.359e7e  itc: 3  flg: E  typ: 1 - DATA

     brn: 0  bdba: 0x10000f8 ver: 0x01 opc: 0

     inc: 0  exflg: 0

 Itl           Xid                  Uba         Flag  Lck        Scn/Fsc

0x01   0x0008.005.0000097b  0x00000000.0000.00  C-U-    0  scn 0x0000.00359171

0x02   0x0000.000.00000000  0x00000000.0000.00  ----    0  fsc 0x0000.00000000

0x03   0x0000.000.00000000  0x00000000.0000.00  ----    0  fsc 0x0000.00000000

bdba: 0x010000fb

data_block_dump,data header at 0x20e1a07c

===============

tsiz: 0x1f80

hsiz: 0x1a

pbl: 0x20e1a07c

     76543210

flag=--------

ntab=1

nrow=4

frre=-1

fsbo=0x1a

fseo=0x1f28

avsp=0x1f0e

tosp=0x1f0e

0xe:pti[0]      nrow=4  offs=0

0x12:pri[0]     offs=0x1f28

0x14:pri[1]     offs=0x1f42

0x16:pri[2]     offs=0x1f58

0x18:pri[3]     offs=0x1f70

block_row_dump:

tab 0, row 0, @0x1f28

tl: 26 fb: --H-FL-- lb: 0x0  cc: 3

col  0: [ 2]  c1 0b

col  1: [10]  41 43 43 4f 55 4e 54 49 4e 47

col  2: [ 8]  4e 45 57 20 59 4f 52 4b

tab 0, row 1, @0x1f42

tl: 22 fb: --H-FL-- lb: 0x0  cc: 3

col  0: [ 2]  c1 15

col  1: [ 8]  52 45 53 45 41 52 43 48

col  2: [ 6]  44 41 4c 4c 41 53

tab 0, row 2, @0x1f58

tl: 24 fb: --H-FL-- lb: 0x0  cc: 3

col  0: [ 2]  c1 29

col  1: [10]  4f 50 45 52 41 54 49 4f 4e 53

col  2: [ 6]  42 4f 53 54 4f 4e

tab 0, row 3, @0x1f70

tl: 16 fb: --H-FL-- lb: 0x0  cc: 3

col  0: [ 2]  c1 64

col  1: [ 6]  63 68 65 64 61 6e

col  2: [ 2]  62 6a

end_of_block_dump