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    标题: [精华] 修改fet$基表,结合碎片
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    发表于 2006-5-24 17:31 
    修改fet$基表,结合碎片

    背景:

    OS:AIX 4.3.3

    ORACLE:8.1.7.4 compatible:8.1.0

    一计费系统,有个数据字典管理的表空间有170多G。客户已将其中的数据全部迁移到一个新的local管理的表空间(还剩一个临时段),打算将这个表空间drop掉。但是已偿试了两个晚上,都无法drop掉。于是空间十分紧张,急需要将这个表空间释放出来。



    检查这个表空间的碎片,吓了一跳,居然有124万多个。怪不得整个晚上都无法drop掉(为了不影响业务,只能是晚上drop,白天必须停止)。

    一时间,脑海里面冒出以下几个思路:

    1.修改fet$基表,结合碎片。

    2.alter tablespace ... coalesce;

    3.将表空间由字典转换成local。

    4.将每个数据文件resize。

    首先偿试一个晚上coalesce。但是第二天来的时候,一个晚上才结合了1万多个碎片。这样的速度是无法接受的。

    中午时分试了一下Resize,也是很慢。不过我估计一个晚上还是能做几个数据文件的resize.

    偿试将表空间转换成local,但是不幸的是需要compatible为8.1.6以上。当时数据库是从低版本升上来的,compatible一直没有调高,这样调高有可能引响业务。所以也不敢轻易地调整。

    剩下是修改fet$基表。oracle结合碎片的思路其实是挺简单的,将连续的碎片结合成一块,修改length长度即可。

    这个表空间有43个文件,那个临时段占用了5个文件。其余38个文件都是空的,那么在fet$表中应该就是一条记录,block#为2,length为数据文件的blocks-1。

    这样首先将这个表空间offline掉,这个表空间在fet$表中的数据就不会发生改变了。

    首先处理那38个空闲文件:

    首先查找完全空闲的数据文件及其blocks的总数:
    select file_id,file_name,bytes/1024/1024,blocks-1 from dba_data_files where tablespace_name='TB_CDR'
    and file_id not in (select file_id from dba_extents where tablespace_name='TB_CDR')


    手工修改fet$基表:
    delete fet$ where ts#=13 and block# > 2 and file#=14 ;
    delete fet$ where ts#=13 and block# > 2 and file#=18 ;
    delete fet$ where ts#=13 and block# > 2 and file#=24 ;
    delete fet$ where ts#=13 and block# > 2 and file#=25 ;
    delete fet$ where ts#=13 and block# > 2 and file#=26 ;

    delete fet$ where ts#=13 and block# > 2 and file#=27 ;
    delete fet$ where ts#=13 and block# > 2 and file#=28 ;
    delete fet$ where ts#=13 and block# > 2 and file#=41 ;
    delete fet$ where ts#=13 and block# > 2 and file#=42 ;
    delete fet$ where ts#=13 and block# > 2 and file#=43 ;
    delete fet$ where ts#=13 and block# > 2 and file#=44 ;
    delete fet$ where ts#=13 and block# > 2 and file#=54 ;
    delete fet$ where ts#=13 and block# > 2 and file#=55 ;
    delete fet$ where ts#=13 and block# > 2 and file#=58 ;

    delete fet$ where ts#=13 and block# > 2 and file#=60 ;
    delete fet$ where ts#=13 and block# > 2 and file#=61 ;
    delete fet$ where ts#=13 and block# > 2 and file#=63 ;
    delete fet$ where ts#=13 and block# > 2 and file#=64 ;
    delete fet$ where ts#=13 and block# > 2 and file#=66 ;
    delete fet$ where ts#=13 and block# > 2 and file#=67 ;

    delete fet$ where ts#=13 and block# > 2 and file#=72 ;
    delete fet$ where ts#=13 and block# > 2 and file#=73 ;
    delete fet$ where ts#=13 and block# > 2 and file#=76 ;
    delete fet$ where ts#=13 and block# > 2 and file#=77 ;
    delete fet$ where ts#=13 and block# > 2 and file#=78 ;
    delete fet$ where ts#=13 and block# > 2 and file#=79 ;
    delete fet$ where ts#=13 and block# > 2 and file#=80 ;

    delete fet$ where ts#=13 and block# > 2 and file#=81 ;
    delete fet$ where ts#=13 and block# > 2 and file#=83 ;
    delete fet$ where ts#=13 and block# > 2 and file#=106;
    delete fet$ where ts#=13 and block# > 2 and file#=107;
    delete fet$ where ts#=13 and block# > 2 and file#=108;
    delete fet$ where ts#=13 and block# > 2 and file#=109;

    delete fet$ where ts#=13 and block# > 2 and file#=110;
    delete fet$ where ts#=13 and block# > 2 and file#=111;
    delete fet$ where ts#=13 and block# > 2 and file#=123;
    delete fet$ where ts#=13 and block# > 2 and file#=124;
    delete fet$ where ts#=13 and block# > 2 and file#=125;

    length为数据文件的blocks数量减1:
    update fet$ set length=511999 where ts#=13 and block#=2 and file#=14 ;
    update fet$ set length=511999 where ts#=13 and block#=2 and file#=18 ;
    update fet$ set length=511999 where ts#=13 and block#=2 and file#=24 ;
    update fet$ set length=511999 where ts#=13 and block#=2 and file#=25 ;
    update fet$ set length=511999 where ts#=13 and block#=2 and file#=26 ;
    update fet$ set length=511999 where ts#=13 and block#=2 and file#=27 ;
    update fet$ set length=511999 where ts#=13 and block#=2 and file#=28 ;
    update fet$ set length=524159 where ts#=13 and block#=2 and file#=41 ;
    update fet$ set length=524159 where ts#=13 and block#=2 and file#=42 ;
    update fet$ set length=524159 where ts#=13 and block#=2 and file#=43 ;
    update fet$ set length=524159 where ts#=13 and block#=2 and file#=44 ;
    update fet$ set length=524159 where ts#=13 and block#=2 and file#=54 ;
    update fet$ set length=524159 where ts#=13 and block#=2 and file#=55 ;
    update fet$ set length=524159 where ts#=13 and block#=2 and file#=58 ;
    update fet$ set length=524159 where ts#=13 and block#=2 and file#=60 ;
    update fet$ set length=524159 where ts#=13 and block#=2 and file#=61 ;
    update fet$ set length=524159 where ts#=13 and block#=2 and file#=63 ;
    update fet$ set length=524159 where ts#=13 and block#=2 and file#=64 ;
    update fet$ set length=524159 where ts#=13 and block#=2 and file#=66 ;
    update fet$ set length=524159 where ts#=13 and block#=2 and file#=67 ;
    update fet$ set length=524159 where ts#=13 and block#=2 and file#=72 ;
    update fet$ set length=524159 where ts#=13 and block#=2 and file#=73 ;
    update fet$ set length=524159 where ts#=13 and block#=2 and file#=76 ;
    update fet$ set length=524159 where ts#=13 and block#=2 and file#=77 ;
    update fet$ set length=524159 where ts#=13 and block#=2 and file#=78 ;
    update fet$ set length=524159 where ts#=13 and block#=2 and file#=79 ;
    update fet$ set length=524159 where ts#=13 and block#=2 and file#=80 ;
    update fet$ set length=524159 where ts#=13 and block#=2 and file#=81 ;
    update fet$ set length=524159 where ts#=13 and block#=2 and file#=83 ;
    update fet$ set length=524159 where ts#=13 and block#=2 and file#=106;
    update fet$ set length=524159 where ts#=13 and block#=2 and file#=107;
    update fet$ set length=524159 where ts#=13 and block#=2 and file#=108;
    update fet$ set length=524159 where ts#=13 and block#=2 and file#=109;
    update fet$ set length=524159 where ts#=13 and block#=2 and file#=110;
    update fet$ set length=524159 where ts#=13 and block#=2 and file#=111;
    update fet$ set length=524159 where ts#=13 and block#=2 and file#=123;
    update fet$ set length=524159 where ts#=13 and block#=2 and file#=124;
    update fet$ set length=524159 where ts#=13 and block#=2 and file#=125;

    这样处理完后,这个表空间还有16万个碎片。

    针对那些有数据的数据文件一样手工结合,跳过那些有数据的块。查找dba_extents,找出那个临时段所占用的块号和块数。
    =====
    4号文件
    delete fet$ where ts#=13 and file#=4 and block# >2 and block# < 344181;
    update fet$ set length=344183 where ts#=13 and file#=4 and block#=2;


    delete fet$ where ts#=13 and file#=4 and block# > 344195;
    update fet$ set length=167806 where ts#=13 and file#=4 and block#=344195;

    =====
    10号文件
    delete fet$ where ts#=13 and file#=10 and block# >2 and block# < 288852;
    update fet$ set length=288850 where ts#=13 and file#=10 and block#=2;

    delete fet$ where ts#=13 and file#=10 and block# >2 and block# > 288867;
    update fet$ set length=223134 where ts#=13 and file#=10 and block#=288867;

    =====
    13号文件

    delete fet$ where ts#=13 and file#=13 and block# >2 and block# < 30298;
    update fet$ set length=30296 where ts#=13 and file#=13 and block#=2;

    delete fet$ where ts#=13 and file#=13 and block# >2 and block# > 30318;
    update fet$ set length=481683 where ts#=13 and file#=13 and block#=30318;


    =====
    68号文件

    delete fet$ where ts#=13 and file#=68 and block# >2 and block# < 518537;
    update fet$ set length=518535 where ts#=13 and file#=68 and block#=2;

    ====
    69号文件
    delete fet$ where ts#=13 and file#=69 and block# >2 and block# < 182428;
    update fet$ set length=182426 where ts#=13 and file#=69 and block#=2;

    delete fet$ where ts#=13 and file#=69 and block# >2 and block# > 182438;
    update fet$ set length=341723 where ts#=13 and file#=69 and block#=182438;

    这样处理完后,直接drop tablespace,很快就搞定了。


    __________________
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    发表于 2006-5-24 17:45 
    胆大心细


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    发表于 2006-5-24 18:08 
    Re: 修改fet$基表,结合碎片



    QUOTE:
    最初由 logzgh 发布
    背景:

    OS:AIX 4.3.3

    ORACLE:8.1.7.4 compatible:8.1.0

    一计费系统,有个数据字典管理的表空间有170多G。客户已将其中的数据全部迁移到一个新的local管理的表空间(还剩一个临时段),打算将这个表空间drop掉。但是已偿试了两个晚上,都无法drop掉。于是空间十分紧张,急需要将这个表空间释放出来。



    检查这个表空间的碎片,吓了一跳,居然有124万多个。怪不得整个晚上都无法drop掉(为了不影响业务,只能是晚上drop,白天必须停止)。

    一时间,脑海里面冒出以下几个思路:

    1.修改fet$基表,结合碎片。

    2.alter tablespace ... coalesce;

    3.将表空间由字典转换成local。

    4.将每个数据文件resize。

    首先偿试一个晚上coalesce。但是第二天来的时候,一个晚上才结合了1万多个碎片。这样的速度是无法接受的。

    中午时分试了一下Resize,也是很慢。不过我估计一个晚上还是能做几个数据文件的resize.

    偿试将表空间转换成local,但是不幸的是需要compatible为8.1.6以上。当时数据库是从低版本升上来的,compatible一直没有调高,这样调高有可能引响业务。所以也不敢轻易地调整。

    剩下是修改fet$基表。oracle结合碎片的思路其实是挺简单的,将连续的碎片结合成一块,修改length长度即可。

    这个表空间有43个文件,那个临时段占用了5个文件。其余38个文件都是空的,那么在fet$表中应该就是一条记录,block#为2,length为数据文件的blocks-1。

    这样首先将这个表空间offline掉,这个表空间在fet$表中的数据就不会发生改变了。

    首先处理那38个空闲文件:

    首先查找完全空闲的数据文件及其blocks的总数:
    select file_id,file_name,bytes/1024/1024,blocks-1 from dba_data_files where tablespace_name='TB_CDR'
    and file_id not in (select file_id from dba_extents where tablespace_name='TB_CDR')


    手工修改fet$基表:
    delete fet$ where ts#=13 and block# > 2 and file#=14 ;
    delete fet$ where ts#=13 and block# > 2 and file#=18 ;
    delete fet$ where ts#=13 and block# > 2 and file#=24 ;
    delete fet$ where ts#=13 and block# > 2 and file#=25 ;
    delete fet$ where ts#=13 and block# > 2 and file#=26 ;

    delete fet$ where ts#=13 and block# > 2 and file#=27 ;
    delete fet$ where ts#=13 and block# > 2 and file#=28 ;
    delete fet$ where ts#=13 and block# > 2 and file#=41 ;
    delete fet$ where ts#=13 and block# > 2 and file#=42 ;
    delete fet$ where ts#=13 and block# > 2 and file#=43 ;
    delete fet$ where ts#=13 and block# > 2 and file#=44 ;
    delete fet$ where ts#=13 and block# > 2 and file#=54 ;
    delete fet$ where ts#=13 and block# > 2 and file#=55 ;
    delete fet$ where ts#=13 and block# > 2 and file#=58 ;

    delete fet$ where ts#=13 and block# > 2 and file#=60 ;
    delete fet$ where ts#=13 and block# > 2 and file#=61 ;
    delete fet$ where ts#=13 and block# > 2 and file#=63 ;
    delete fet$ where ts#=13 and block# > 2 and file#=64 ;
    delete fet$ where ts#=13 and block# > 2 and file#=66 ;
    delete fet$ where ts#=13 and block# > 2 and file#=67 ;

    delete fet$ where ts#=13 and block# > 2 and file#=72 ;
    delete fet$ where ts#=13 and block# > 2 and file#=73 ;
    delete fet$ where ts#=13 and block# > 2 and file#=76 ;
    delete fet$ where ts#=13 and block# > 2 and file#=77 ;
    delete fet$ where ts#=13 and block# > 2 and file#=78 ;
    delete fet$ where ts#=13 and block# > 2 and file#=79 ;
    delete fet$ where ts#=13 and block# > 2 and file#=80 ;

    delete fet$ where ts#=13 and block# > 2 and file#=81 ;
    delete fet$ where ts#=13 and block# > 2 and file#=83 ;
    delete fet$ where ts#=13 and block# > 2 and file#=106;
    delete fet$ where ts#=13 and block# > 2 and file#=107;
    delete fet$ where ts#=13 and block# > 2 and file#=108;
    delete fet$ where ts#=13 and block# > 2 and file#=109;

    delete fet$ where ts#=13 and block# > 2 and file#=110;
    delete fet$ where ts#=13 and block# > 2 and file#=111;
    delete fet$ where ts#=13 and block# > 2 and file#=123;
    delete fet$ where ts#=13 and block# > 2 and file#=124;
    delete fet$ where ts#=13 and block# > 2 and file#=125;

    length为数据文件的blocks数量减1:
    update fet$ set length=511999 where ts#=13 and block#=2 and file#=14 ;
    update fet$ set length=511999 where ts#=13 and block#=2 and file#=18 ;
    update fet$ set length=511999 where ts#=13 and block#=2 and file#=24 ;
    update fet$ set length=511999 where ts#=13 and block#=2 and file#=25 ;
    update fet$ set length=511999 where ts#=13 and block#=2 and file#=26 ;
    update fet$ set length=511999 where ts#=13 and block#=2 and file#=27 ;
    update fet$ set length=511999 where ts#=13 and block#=2 and file#=28 ;
    update fet$ set length=524159 where ts#=13 and block#=2 and file#=41 ;
    update fet$ set length=524159 where ts#=13 and block#=2 and file#=42 ;
    update fet$ set length=524159 where ts#=13 and block#=2 and file#=43 ;
    update fet$ set length=524159 where ts#=13 and block#=2 and file#=44 ;
    update fet$ set length=524159 where ts#=13 and block#=2 and file#=54 ;
    update fet$ set length=524159 where ts#=13 and block#=2 and file#=55 ;
    update fet$ set length=524159 where ts#=13 and block#=2 and file#=58 ;
    update fet$ set length=524159 where ts#=13 and block#=2 and file#=60 ;
    update fet$ set length=524159 where ts#=13 and block#=2 and file#=61 ;
    update fet$ set length=524159 where ts#=13 and block#=2 and file#=63 ;
    update fet$ set length=524159 where ts#=13 and block#=2 and file#=64 ;
    update fet$ set length=524159 where ts#=13 and block#=2 and file#=66 ;
    update fet$ set length=524159 where ts#=13 and block#=2 and file#=67 ;
    update fet$ set length=524159 where ts#=13 and block#=2 and file#=72 ;
    update fet$ set length=524159 where ts#=13 and block#=2 and file#=73 ;
    update fet$ set length=524159 where ts#=13 and block#=2 and file#=76 ;
    update fet$ set length=524159 where ts#=13 and block#=2 and file#=77 ;
    update fet$ set length=524159 where ts#=13 and block#=2 and file#=78 ;
    update fet$ set length=524159 where ts#=13 and block#=2 and file#=79 ;
    update fet$ set length=524159 where ts#=13 and block#=2 and file#=80 ;
    update fet$ set length=524159 where ts#=13 and block#=2 and file#=81 ;
    update fet$ set length=524159 where ts#=13 and block#=2 and file#=83 ;
    update fet$ set length=524159 where ts#=13 and block#=2 and file#=106;
    update fet$ set length=524159 where ts#=13 and block#=2 and file#=107;
    update fet$ set length=524159 where ts#=13 and block#=2 and file#=108;
    update fet$ set length=524159 where ts#=13 and block#=2 and file#=109;
    update fet$ set length=524159 where ts#=13 and block#=2 and file#=110;
    update fet$ set length=524159 where ts#=13 and block#=2 and file#=111;
    update fet$ set length=524159 where ts#=13 and block#=2 and file#=123;
    update fet$ set length=524159 where ts#=13 and block#=2 and file#=124;
    update fet$ set length=524159 where ts#=13 and block#=2 and file#=125;

    这样处理完后,这个表空间还有16万个碎片。

    针对那些有数据的数据文件一样手工结合,跳过那些有数据的块。查找dba_extents,找出那个临时段所占用的块号和块数。
    =====
    4号文件
    delete fet$ where ts#=13 and file#=4 and block# >2 and block# < 344181;
    update fet$ set length=344183 where ts#=13 and file#=4 and block#=2;


    delete fet$ where ts#=13 and file#=4 and block# > 344195;
    update fet$ set length=167806 where ts#=13 and file#=4 and block#=344195;

    =====
    10号文件
    delete fet$ where ts#=13 and file#=10 and block# >2 and block# < 288852;
    update fet$ set length=288850 where ts#=13 and file#=10 and block#=2;

    delete fet$ where ts#=13 and file#=10 and block# >2 and block# > 288867;
    update fet$ set length=223134 where ts#=13 and file#=10 and block#=288867;

    =====
    13号文件

    delete fet$ where ts#=13 and file#=13 and block# >2 and block# < 30298;
    update fet$ set length=30296 where ts#=13 and file#=13 and block#=2;

    delete fet$ where ts#=13 and file#=13 and block# >2 and block# > 30318;
    update fet$ set length=481683 where ts#=13 and file#=13 and block#=30318;


    =====
    68号文件

    delete fet$ where ts#=13 and file#=68 and block# >2 and block# < 518537;
    update fet$ set length=518535 where ts#=13 and file#=68 and block#=2;

    ====
    69号文件
    delete fet$ where ts#=13 and file#=69 and block# >2 and block# < 182428;
    update fet$ set length=182426 where ts#=13 and file#=69 and block#=2;

    delete fet$ where ts#=13 and file#=69 and block# >2 and block# > 182438;
    update fet$ set length=341723 where ts#=13 and file#=69 and block#=182438;

    这样处理完后,直接drop tablespace,很快就搞定了。


    这都敢做 ^_^ 哈哈


    __________________
    我是懒猫猫申明我不是老大我是学习来的有错给我指出来谢谢
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    发表于 2006-5-24 18:24 
    8i以后不用这么干了。看楼主玩的真玄。


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    发表于 2006-5-24 19:41 
    真是胆大包天啊!!!
    一不小心会死的很惨!!!!!!!!



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    发表于 2006-5-24 20:16 
    这也敢做??还是生产环境!


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    发表于 2006-5-25 10:16 
    呵呵。。。我最开始想到这个想法时,也是打算在晚上做,并做好各种保证的方法,以做好回退之路。
    但是随着对oracle结合碎片过程和fet$表的了解,我就越来越有信心这样做了。我先将tb_cdr表空间offline后,这样可以保证关于该表空间在fet$表中的记录不会修改。
    然后我再备份关于该表空间的记录。然后再做修改。
    因为我并没有修改其他的记录。所以不会影响其他的表空间的记录。

    这也是被客户逼的没办法,再不干掉这个表空间,就无法出帐了,到时还得了啊。


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    发表于 2006-5-25 11:00 
    我觉的就是如biti所说,只要胆大心细就可以做了。


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    发表于 2006-5-25 12:50 
    有过很你同样的问题!后来我是起了个别job 一点一点resize


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    发表于 2006-5-25 14:03 


    QUOTE:
    最初由 zjusxzj 发布
    有过很你同样的问题!后来我是起了个别job 一点一点resize

    但是resize有个问题,在那里一点一点的resize会影响业务的吧。
    即使每次Resize一点,也要好长时间。


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