Oracle 經常使用的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統計信息

2 包含hash table histogram

3 包含object handle

4 包含object結構（Heap 0）

3).Row Cache

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

1 row cache統計信息

2 包含hash table histogram

8 包含object結構

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爲某個指定block的rdba，該命令能夠轉儲某個block在buffer中的全部版本。

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內容

2050 SGA內容

4100 UGA內容

8200 Current call內容

16400 User call內容

32800 Large call內容

7).Sub Heap

Oracle 9.0.1版本以前

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

若n爲subheap的地址，轉儲的是subheap的摘要信息

若n爲subheap的地址+1，轉儲的則是subheap的內容

Oracle 9.2.0版本以後

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

其中m爲subheap的地址

n爲1轉儲subheap的摘要，n爲2轉儲subheap的內容

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詳細信息

13).Latches

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

1 latch信息

2 統計信息

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取值爲1~14

17).Background Messages

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

n爲pid+1

二.File Dumps

1).Block

Oracle 7以前

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

n爲block的rdba

Oracle8之後

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爲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 控制文件中的文件頭信息

2 level 1 + 文件頭信息

3 level 2 + 數據文件頭信息

10 level 3

6).Control file

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

1 文件頭信息

2 level 1 + 數據庫信息 + 檢查點信息

3 level 2 + 可重用節信息

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 + 文件頭信息

3 level 2 + 日誌文件頭信息

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控制文件中最先和最遲的日誌歷史項

1 dump 2^n個日誌歷史項

三.   Trace 文件使用示例

udump下的trc文件能夠經過配置不讓產生,利用命令

alter system set sql_trace=false;

其餘的不能修改，只能手動的啓動trace，手動的關閉trace.

好比：

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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