Oracle 常用dump命令
以前也整理過一遍有關跟蹤事件的文章,不過命令方面沒有這篇強。
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Oracle 跟蹤事件 set event
http://blog.csdn.net/tianlesoftware/archive/2009/12/10/4977827.aspx
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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
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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)
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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
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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
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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。
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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
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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的摘要信息
若n為subheap的地址+1,轉儲的則是subheap的內容
Oracle 9.2.0版本之后
ALTER SESSION SET EVENTS ‘immediate trace name heapdump_addr level n, addr m’;
其中m為subheap的地址
n為1轉儲subheap的摘要,n為2轉儲subheap的內容
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8).Process State
ALTER SESSION SET EVENTS ‘immediate trace name processstate level n’;
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9).System State
ALTER SESSION SET EVENTS ‘immediate trace name systemstate level n’;
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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’;
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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
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13).Latches
ALTER SESSION SET EVENTS ‘immediate trace name latches level n’;
1 latch信息
2 統計信息
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14).Events
ALTER SESSION SET EVENTS ‘immediate trace name events level n’;
1 session
2 process
3 system
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15).Locks
ALTER SESSION SET EVENTS ‘immediate trace name locks level n’;
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16).Shared Server Process
ALTER SESSION SET EVENTS ‘immediate trace name shared_server_state level n’;
n取值為1~14
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17).Background Messages
ALTER SESSION SET EVENTS ‘immediate trace name bg_messages level n’;
n為pid+1
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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以后
ALTER SYSTEM DUMP DATAFILE file# BLOCK block#;
ALTER SYSTEM DUMP DATAFILE file#
BLOCK MIN minimum_block#
BLOCK MAX maximum_block#;
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2).Tree Dump
ALTER SESSION SET EVENTS ‘immediate trace name treedump level n’;
n為object_id
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3).Undo Segment Header
ALTER SYSTEM DUMP UNDO_HEADER ’segment_name’;
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4).Undo for a Transaction
ALTER SYSTEM DUMP UNDO BLOCK ’segment_name’ XID xidusn xidslot xidsqn;
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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
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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
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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 + 日志文件頭信息
10 level 3
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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;
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9).Loghist
ALTER SESSION SET EVENTS ‘immediate trace name loghist level n’;
1 dump控制文件中最早和最遲的日志歷史項
1 dump 2^n個日志歷史項
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三, Trace 文件使用示例
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udump下的trc文件可以通過配置不讓產生,利用命令
alter system set sql_trace=false;
其他的不能修改,只能手動的啟動trace,手動的關閉trace.
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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';
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alter session set events '10046 trace name context forever,level 12';
alter session set events '10046 trace name context off';
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alter system set events '10046 trace name context forever,level 12';
alter system set events '10046 trace name context off';
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1. 使用autotrace:
set autotrace ON | ON EXPLAIN | ON STATISTICS | TRACEONLY | TRACEONLY EXPLAIN
set autotrace off
這個用法是最簡單方便的,執行sql結束之后,會自動在同個窗口顯示sql的執行計劃和統計信息。
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2. 使用set events context :
SQL> alter session set sql_trace=true;
SQL> alter session set sql_trace=false;
屬于當前session級設置
大多數的情況下,我們使用sql_trace跟蹤當前進程。通過跟蹤當前進程可以發現當前操作的后臺數據庫遞歸活動(這在研究數據庫新特性時尤其有效),研究SQL執行,發現后臺錯誤等。
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alter session set events '10046 trace name context forever,level 12';
alter session set events '10046 trace name context off';
10046事件概述:
10046事件是Oracle提供的內部事件,是對SQL_TRACE的增強.
10046事件可以設置以下四個級別:
1 - 啟用標準的SQL_TRACE功能,等價于sql_trace
4 - Level 1 加上綁定值(bind values)
8 - Level 1 + 等待事件跟蹤
12 - Level 1 + Level 4 + Level 8
類似sql_trace,10046事件可以在全局設置,也可以在session級設置。
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3. 使用set events immediate
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';
Level =1 ,轉儲Library cache統計信息
Level =2 ,轉儲hash table概要
Level =4 ,轉儲Library cache對象,只包含基本信息
Level =8 ,轉儲Library cache對象,包含詳細信息(包括child references,pin waiters等)
Level =16,增加heap sizes信息
Level =32,增加heap信息
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9i清理buffer cache
???alter session set events 'immediate trace name flush_cache level 1';
???alter session set events = 'immediate trace name flush_cache'
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4. 使用set events errorstack
alter session set events 'err_num trace name errorstack level 10';
alter session set events 'err_num trace name errorstack off'
err_num=報錯代碼,如ORA-00942 應該在err_num填入942
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5. 使用dbms_support(trace別的session):
exec dbms_support.start_trace_in_session(sid=>XX,seiral#=>XXX,wait=>true,binds=>true);
exec dbms_support.stop_trace_in_session(sid=>XX,seiral#=>XXX);
這類trace用到很少,以后再研究。
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6. 使用oradebug(trace別的session):
oradebug setospid (PID 能從ps -ef 中得出)
oradebug unlimit
oradebug event 10046 trace name context forever,level 12;
oradebug event 10046 trace name context off;
這類同樣用到很少。
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7. 使用dbms_system.set_ev:
exec dbms_system.set_ev(sid,serial#,10046,trace_level,'username');
exec dbms_system.set_ev(sid,serial#,10046,0,'username');
通過DBMS_SYSTEM.SET_EV系統包來實現對sql的跟蹤
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轉載于:https://www.cnblogs.com/zlja/archive/2009/12/10/2449972.html
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