什么是DUMP： 美[d∧mp] 转贮；转存；转贮数据 （内存信息）转贮，转存
大家在学习研究Oracle的过程中，为了更深入的了解内部的机制，免不了要经常DUMP来研究学习。
Oracle 11g的Trace文件存放路径：oracle\diag\rdbms\**\**\trace
1、DUMP出控制文件
alter system (session) set events 'immediate trace name controlf level 10'
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2、DUMP出日志文件分析
alter system dump logfile logfilename;
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3、DUMP出日志文件头分析
alter session set events 'immediate trace name REDOHDR level 10'
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4、DUMP出LIBRARY CACHE
alter system (session) set events 'immediate trace name library_cache level 10'
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5、 DUMP出share_pool
alter system (session) set events 'immediate trace name heapdump level 10'
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6、DUMP出所有数据文件头
alter system (session) set events 'immediate trace name file_hdrs level 10';
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7、DUMP出数据文件（只能是alter system）
alter system dump datafile n block m
如
select file_id,block_id,blocks from dba_extents where segment_name='EMPLOYEES'
FILE_ID BLOCK_ID BLOCKS
---------- ---------- ------------------
5 81 8
SQL>alter system dump datafile 5 block 81;
System altered.
另外是做很具体的针对某行所在的BLOCK 并DUMP出来研究，可以用如下方法
1、取BLOCK号
select dbms_rowid.rowid_block_number(rowid) from wdjk1999;
DBMS_ROWID.ROWID_BLOCK_NUMBER(ROWID)
78
2、取文件号
select file_id from dba_data_files where tablespace_name='WDJK1999'
FILE_ID
----------
16
SQL>alter system dump datafile 16 block 78;
System altered.
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8、DUMP出索引
SQL> select object_id from dba_objects where object_name=upper('index_name');
OBJECT_ID
----------
70591
SQL> alter session set events 'immediate trace name TREEDUMP level 70591';
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