Oracle 常用的dump(Memory Dumps/File Dumps/Trace 文件使用示例)

一.Memory Dumps

1).Global Area

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

1 包含PGA

2 包含SGA

4 包含UGA

8 包含indrect memory

2).Library Cache

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

1 library cache统计信息

2 包含hash table histogram

3 包含object handle

4 包含object结构（Heap 0）

3).Row Cache

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

1 row cache统计信息

2 包含hash table histogram

8 包含object结构

4).Buffers

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

5).Buffer

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

n为某个指定block的rdba，该命令可以转储某个block在buffer中的所有版本。

6).Heap

ALTER SESSION SET EVENTS ‘immediate trace name heapdump level level’;

1 PGA摘要

2 SGA摘要

4 UGA摘要

8 Current call(CGA)摘要

16 User call(CGA)摘要

32 Large call(LGA)摘要

1025 PGA内容

2050 SGA内容

4100 UGA内容

8200 Current call内容

16400 User call内容

32800 Large call内容

7).Sub Heap

Oracle 9.0.1版本之前

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

若n为subheap的地址，转储的是subheap的摘要信息

若n为subheap的地址+1，转储的则是subheap的内容

Oracle 9.2.0版本之后

ALTER SESSION SET EVENTS ‘immediate trace name heapdump_addr level n, addr m’;

其中m为subheap的地址

n为1转储subheap的摘要，n为2转储subheap的内容

8).Process State

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

9).System State

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

10).Error State

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

0 Error stack

1 level 0 + function call stack

2 level 1 + process state

3 level 2 + context area

11).Hang Analysis

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

12).Work Area

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

1 SGA信息

2 Workarea Table摘要信息

3 Workarea Table详细信息

13).Latches

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

1 latch信息

2 统计信息

14).Events

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

1 session

2 process

3 system

15).Locks

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

16).Shared Server Process

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

n取值为1~14

17).Background Messages

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

n为pid+1

二.File Dumps

1).Block

Oracle 7之前

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

n为block的rdba

Oracle8以后

ALTER SYSTEM DUMP DATAFILE file# BLOCK block#;

ALTER SYSTEM DUMP DATAFILE file#

BLOCK MIN minimum_block#

BLOCK MAX maximum_block#;

2).Tree Dump

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

n为object_id

3).Undo Segment Header

ALTER SYSTEM DUMP UNDO_HEADER ’segment_name’;

4).Undo for a Transaction

ALTER SYSTEM DUMP UNDO BLOCK ’segment_name’ XID xidusn xidslot xidsqn;

5).File Header

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

1 控制文件中的文件头信息

2 level 1 + 文件头信息

3 level 2 + 数据文件头信息

10 level 3

6).Control file

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

1 文件头信息

2 level 1 + 数据库信息 + 检查点信息

3 level 2 + 可重用节信息

10 level 3

7).Redo log Header

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

1 控制文件中的redo log信息

2 level 1 + 文件头信息

3 level 2 + 日志文件头信息

10 level 3

8).Redo log

ALTER SYSTEM DUMP LOGFILE ‘FileName’;

ALTER SYSTEM DUMP LOGFILE ‘FileName’

SCN MIN MinimumSCN

SCN MAX MaximumSCN

TIME MIN MinimumTime

TIME MAX MaximumTime

LAYER Layer

OPCODE Opcode

DBA MIN FileNumber . BlockNumber

DBA MAX FileNumber . BlockNumber

RBA MIN LogFileSequenceNumber . BlockNumber

RBA MAX LogFileSequenceNumber . BlockNumber;

其中time = (((((yyyy – 1988)) * 12 + mm – 1) * 31 + dd – 1) * 24 + hh) * 60 + mi) * 60 + ss;

9).Loghist

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

1 dump控制文件中最早和最迟的日志历史项

1 dump 2^n个日志历史项

三.   Trace 文件使用示例

udump下的trc文件可以通过配置不让产生,利用命令

alter system set sql_trace=false;

其他的不能修改，只能手动的启动trace，手动的关闭trace.

比如：

alter session set events 'immediate trace name library_cache|controlf|systemstate|processstate|file_hdrs|REDOHDR level 10';

alter session set events 'immediate trace name off';

alter session set events '10046 trace name context forever,level 12';

alter session set events '10046 trace name context off';

alter system set events '10046 trace name context forever,level 12';

alter system set events '10046 trace name context off';

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