Oracle Internal Events:
Introduction:(简介)
有四种类型的Events:
Immediate dumps
Conditional dumps
Trace dumps
Events that change database behaviour
每一个事件都有一个号跟Oracle的错误信息是一样的.如10046和ORA-10046
每一个事件都有一个Level,可以是以下:
范围1到10
位标 0x01 0x02 0x04 0x08 0x10
标识 0=off,1=on
ID号 对象ID(object id),内存地址(memory address)
要注意的是,Events在每一个版本之间都有所改变.有一些存在的事件可能存在争议性或者已经不可用了,往往这些事件号会由新的事件所替代掉.也要注意在当前的版本中message file不一定可以反映出Events.
很多Events都会影响数据库的行为,一些测试Events极有可能导致数据库DOWN掉.所以,在没有Oracle Support的前提下,最好不要在PRO系统上做Events操作.DEV系统上如果要做Events最好先做个数据库的全备份.
Enabling Events(Enable事件)
Events可以在Instance一级Enabled,主要是在INIT.ORA文件中做操作:
event='event trace name context forever, level level';
(红色部分:event指事件号.level指定事件的级别)
一次可以Enable多个事件,可以用以下两种方式:
1. 用一个冒号隔开
event = "10248 trace name context forever, level 10:10249 trace name context forever, level 10"
2. 两个Events分开写
event="10248 trace name context forever, level 10"
event="10249 trace name context forever, level 10"#一些版本的Oracle，event要一样的大小写
Events也可以在Instance一级用ALTER SYSTEM命令来Enable:
ALTER SYSTEM SET EVENTS 'event trace name context forever, level level';
在Instance一级用以下Disable
ALTER SYSTEM SET EVENTS 'event trace name context off';
Events也可以在Session一级用ALTER SESSION命令来Enable:
ALTER SESSION SET EVENTS 'event trace name context forever, level level';
在Session一级用以下命令Disable:
ALTER SESSION SET EVENTS 'event trace name context off';
Events在其他的Session用ORADEBUG来Enable:
在一个Process中实现Enable:
ORADEBUG EVENT event TRACE NAME CONTEXT FOREVER, LEVEL level
在某个进程中Enable:
ORADEBUG SETORAPID 8(PID进程号)
ORADEBUG EVENT event TRACE NAME CONTEXT FOREVER, LEVEL level
以下命令Disable:
ORADEBUG EVENT event TRACE NAME CONTEXT OFF
在Session中实现Enable:
ORADEBUG SESSION_EVENT event TRACE NAME CONTEXT FOREVER, LEVEL level
在Session中实现Disable:
ORADEBUG SESSION_EVENT event TRACE NAME CONTEXT OFF
Events也可以用DBMS_SYSTEM.SETEV包来实现Enable和Disable
(在做之前要先从V$session视图中获得SID和Serial#)
用以下方式:EXECUTE DBMS_SYSTEM.SET_EV(SID,Serial#,event,level, '')
如EXECUTE dbms_system.set_ev (9,29,10046,8,'');
要Disable则将level改为0,如: EXECUTE dbms_system.set_ev (9,29,10046,0,'');
Listing All Events:(列出所有可用的Events)
大部分的Events number的范围都在10000到10999.可以用以下命令Dump出所有的信息
SET SERVEROUTPUT ON
DECLARE
err_msg VARCHAR2(120);
BEGIN
dbms_output.enable (1000000);
FOR err_num IN 10000..10999
LOOP
err_msg := SQLERRM (-err_num);
IF err_msg NOT LIKE '%Message '||err_num||' not found%' THEN
dbms_output.put_line (err_msg);
END IF;
END LOOP;
END;
/
在UNIX系统下message文件在底下目录$ORACLE_HOME/rdbms/mesg/oraus.msg
在NT系统下message文件在底下目录$ORACLE_HOME/rdbms/mesg/oraus.msg
Listing Enabled Events(列出Enabled Events)
用以下命令列出在当前Session已经Enabled Events:
SET SERVEROUTPUT ON
DECLARE
l_level NUMBER;
BEGIN
FOR l_event IN 10000..10999
LOOP
dbms_system.read_ev (l_event,l_level);
IF l_level > 0 THEN
dbms_output.put_line ('Event '||TO_CHAR (l_event)||
' is set at level '||TO_CHAR (l_level));
END IF;
END LOOP;
END;
/
常用Events的参考:(红色的为最常用的而且对DBA比较有用的Events)
Event 10013 - Monitor Transaction Recovery------在Startup时跟踪事务恢复
ALTER SESSION SET EVENTS '10013 trace name context forever, level 1';
Event 10015 - Dump Undo Segment Headers----在事务恢复后做Dump回退段头信息
ALTER SESSION SET EVENTS '10015 trace name context forever, level 1';
Event 10032 - Dump Sort Statistics----Dump排序的统计信息,level 10是最详细的
ALTER SESSION SET EVENTS '10032 trace name context forever, level 10';
Event 10033 - Dump Sort Intermediate Run Statistics—level 10(不明白)
ALTER SESSION SET EVENTS '10033 trace name context forever, level 10';
Event 10045 - Trace Free List Management Operations—跟踪Freelist
ALTER SESSION SET EVENTS '10045 trace name context forever, level 1';
Event 10046 - Enable SQL Statement Trace---跟踪SQL,有执行计划,邦定变量和等待的统计信息,level 12最详细
ALTER SESSION SET EVENTS '10046 trace name context forever, level 12';
级别level参考如下图:
|
|
|
Level |
Action |
|
1 |
Print SQL statements, execution plans and execution statistics |
|
4 |
As level 1 plus bind variables |
|
8 |
As level 1 plus wait statistics |
|
12 |
As level 1 plus bind variables and wait statistics |
|
Event 10053 - Dump Optimizer Decisions---在分析SQL语句时,Dump出优化器所做的选择,级别level 1最详细
ALTER SESSION SET EVENTS '10053 trace name context forever, level 1';
参考level:
|
Level |
Action |
|
1 |
Print statistics and computations |
|
2 |
Print computations only |
Event 10060 - Dump Predicates---(参考http://www.juliandyke.com/)
Event 10065 - Restrict Library Cache Dump Output for State Object Dumps-(参考http://www.juliandyke.com/)
Event 10079 - Dump SQL*Net Statistics---Dump SQL*NeT的统计信息
ALTER SESSION SET EVENTS '10079 trace name context forever, level 2';
Event 10081 - Trace High Water Mark Changes—跟踪HWM的改变
ALTER SESSION SET EVENTS '10081 trace name context forever, level 1';
Event 10104 - Dump Hash Join Statistics—Dump HASH JOIN的统计信息,用level 10
ALTER SESSION SET EVENTS '10104 trace name context forever, level 10';
Event 10128 - Dump Partition Pruning Information—Dump分区表信息
ALTER SESSION SET EVENTS '10128 trace name context forever, level level';
Level参考
|
Level |
Action |
|
0x0001 |
Dump pruning descriptor for each partitioned object |
|
0x0002 |
Dump partition iterators |
|
0x0004 |
Dump optimizer decisions about partition-wise joins |
|
0x0008 |
Dump ROWID range scan pruning information |
在9.0.1或者后面的版本,在level 2后还需要建立如下的表: CREATE TABLE kkpap_pruning ( partition_count NUMBER, iterator VARCHAR2(32), partition_level VARCHAR2(32), order_pt VARCHAR2(12), call_time VARCHAR2(12), part# NUMBER, subp# NUMBER, abs# NUMBER );
Event 10200 - Dump Consistent Reads---Dump出一致读的信息
ALTER SESSION SET EVENTS '10200 trace name context forever, level 1';
Event 10201 - Dump Consistent Read Undo Application---(不明白)
ALTER SESSION SET EVENTS '10201 trace name context forever, level 1';
Event 10220 - Dump Changes to Undo Header—Dump出Undo头信息的改变
ALTER SESSION SET EVENTS '10220 trace name context forever, level 1';
Event 10221 - Dump Undo Changes—Dump Undo的改变
ALTER SESSION SET EVENTS '10221 trace name context forever, level 7';
Event 10224 - Dump Index Block Splits / Deletes—Dump索引块的Split和Delete信息
ALTER SESSION SET EVENTS '10224 trace name context forever, level 1';
Event 10225 - Dump Changes to Dictionary Managed Extents---Dump出在Row Cache中,字典管理的Extents的改变
ALTER SESSION SET EVENTS '10225 trace name context forever, level 1';
Event 10231--设置在做全表扫描时跳过损坏的数据块（在做EXP时，如果有坏块，设置这个可以使EXP导出时跳过坏块，使得部分数据能可以使用）
ALTER SYSTEM SET EVENTS '10231 trace name context forever,level 10';
Event 10241 - Dump Remote SQL Execution—Dump远程SQL语句的执行信息
ALTER SESSION SET EVENTS '10241 trace name context forever, level 1';
Event 10246 - Trace PMON Process---只能在init.ora中做,不能用ALTER SYSTEM做
event = "10246 trace name context forever, level 1"
Event 10248 - Trace Dispatcher Processes---在init.ora中做(9iDump到udump目录中)
event = "10248 trace name context forever, level 10"
Event 10249 - Trace Shared Server (MTS) Processes---在init.ora中做(9iDump到udump目录中)
event = "10249 trace name context forever, level 10"
Event 10270 - Debug Shared Cursors—(不明白)
event = "10270 trace name context forever, level 10"
Event 10299 - Debug Prefetching---(参考http://www.juliandyke.com/)
event = "10299 trace name context forever, level 1"
Event 10357 - Debug Direct Path---(参考http://www.juliandyke.com/)
ALTER SESSION SET EVENTS '10357 trace name context forever, level 1';
Event 10390 - Dump Parallel Execution Slave Statistics--(参考http://www.juliandyke.com/)
ALTER SESSION SET EVENTS '10390 trace name context forever, level level';
Event 10391-Dump Parallel Execution Granule Allocation---
(参考http://www.juliandyke.com/)
ALTER SESSION SET EVENTS '10391 trace name context forever, level level';
Event 10393 - Dump Parallel Execution Statistics--(参考http://www.juliandyke.com/)
ALTER SESSION SET EVENTS '10393 trace name context forever, level 1';
Event 10500 - Trace SMON Process--在init.ora中做
event = "10500 trace name context forever, level 1"
Event 10608 - Trace Bitmap Index Creation—跟踪二位图索引
ALTER SESSION SET EVENTS '10608 trace name context forever, level 10';
Event 10704 - Trace Enqueues—跟踪队列
ALTER SESSION SET EVENTS '10704 trace name context forever, level 1';
Event 10706 - Trace Global Enqueue Manipulation-(参考http://www.juliandyke.com/)
ALTER SESSION SET EVENTS '10706 trace name context forever, level 1';
Event 10708 - Trace RAC Buffer Cache—跟踪RAC的Buffer Cache
ALTER SESSION SET EVENTS '10708 trace name context forever, level 10';
Event 10710 - Trace Bitmap Index Access--(参考http://www.juliandyke.com/)
ALTER SESSION SET EVENTS '10710 trace name context forever, level 1';
Event 10711 - Trace Bitmap Index Merge Operation—
ALTER SESSION SET EVENTS '10711 trace name context forever, level 1';
Event 10712 - Trace Bitmap Index OR Operation—
ALTER SESSION SET EVENTS '10712 trace name context forever, level 1';
Event 10713 - Trace Bitmap Index AND Operation—
ALTER SESSION SET EVENTS '10713 trace name context forever, level 1';
Event 10714 - Trace Bitmap Index MINUS Operation—
ALTER SESSION SET EVENTS '10714 trace name context forever, level 1';
Event 10715 - Trace Bitmap Index Conversion to ROWIDs Operation—
ALTER SESSION SET EVENTS '10715 trace name context forever, level 1';
Event 10716 - Trace Bitmap Index Compress/Decompress—
ALTER SESSION SET EVENTS '10716 trace name context forever, level 1';
Event 10717 - Trace Bitmap Index Compaction—
ALTER SESSION SET EVENTS '10717 trace name context forever, level 1';
Event 10719 - Trace Bitmap Index DML—
ALTER SESSION SET EVENTS '10719 trace name context forever, level 1';
Event 10730 - Trace Fine Grained Access Predicates—
ALTER SESSION SET EVENTS '10730 trace name context forever, level 1';
Event 10731 - Trace CURSOR Statements—
ALTER SESSION SET EVENTS '10731 trace name context forever, level level';
Levels are:
|
Level |
Action |
|
1 |
Print parent query and subquery |
|
2 |
Print subquery only |
Event 10928 - Trace PL/SQL Execution—
ALTER SESSION SET EVENTS '10928 trace name context forever, level 1';
Event 10938 - Dump PL/SQL Execution Statistics—
ALTER SESSION SET EVENTS '10938 trace name context forever, level 1';
一些其他的Events：
ALTER SESSION SET EVENTS 'immediate trace name flush_cache';--Flush the Buffer cache
资料来源http://www.juliandyke.com/
以上为个人在做DBA时的一些参考资料.
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