alter system set events相關知識(轉帖2)

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統計資訊
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統計資訊
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為某個指定block的rdba，該命令可以轉儲某個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版本之前

ALTER SESSION SET EVENTS 'immediate trace name heapdump_addr level n';

若n為subheap的地址，轉儲的是subheap的摘要資訊
若n為subheap的地址+1，轉儲的則是subheap的內容

Oracle 9.2.0版本之後

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

其中m為subheap的地址

n為1轉儲subheap的摘要，n為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資訊
2 Workarea Table摘要資訊
3 Workarea Table詳細資訊

13).Latches

ALTER SESSION SET EVENTS 'immediate trace name latches level n';

1 latch資訊
2 統計資訊

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 Process

ALTER SESSION SET EVENTS 'immediate trace name shared_server_state level n';

n取值為1~14

17).Background Messages

ALTER SESSION SET EVENTS 'immediate trace name bg_messages level n';

n為pid+1

二.File Dumps

1).Block

Oracle 7之前

ALTER SESSION SET EVENTS 'immediate trace name blockdump level n';

n為block的rdba

Oracle8以後

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為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 控制檔案中的檔案頭資訊
2 level 1 + 檔案頭資訊
3 level 2 + 資料檔案頭資訊
10 level 3

6).Control file

ALTER SESSION SET EVENTS 'immediate trace name controlf level n';

1 檔案頭資訊
2 level 1 + 資訊 + 檢查點資訊
3 level 2 + 可重用節資訊
10 level 3

7).Redo log Header

ALTER SESSION SET EVENTS 'immediate trace name redohdr level n';

1 控制檔案中的redo log資訊
2 level 1 + 檔案頭資訊
3 level 2 + 日誌檔案頭資訊
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';

1dump控制檔案中最早和最遲的日誌歷史項
>1 dump 2^n個日誌歷史項