介绍了DUMP buffer cache中全部数据块及指定RDBA的数据块方法。
1.DUMP buffer cache中全部数据块
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的数据块方法
BYS@ 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
BYS@ bys3>select dbms_utility.make_data_block_address(4,251) from dual; --使用此函数算出rdba--就是rowid中的rfile#+block#
DBMS_UTILITY.MAKE_DATA_BLOCK_ADDRESS(4,251)
-------------------------------------------
16777467
BYS@ bys3>alter session set events 'immediate trace name set_tsn_p1 level 5'; --这里的5是表空间号加1得到的。也就是TS#+1。select ts#,name from v$tablespace;
Session altered.
BYS@ bys3>alter session set events 'immediate trace name buffer level16777467';
Session altered.
BYS@ bys3>select value from v$diag_info where name like 'De%';
VALUE
---------------------------------------------------
/u01/diag/rdbms/bys3/bys3/trace/bys3_ora_21011.trc
###########################
3.查看TRACE文件--就先不解读了
[oracle@bys3 ~]$ 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: oracle@bys3.bys.com (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 0000000