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HomeDatabaseMysql Tutorial关于Oracle分区表的move操作

关于分区表的move操作还是很值得深究的一个问题。如果分区表中含有lob字段,难度还会加大。 对于普通的表而言,做move操作室理所

关于分区表的move操作还是很值得深究的一个问题。如果分区表中含有lob字段,难度还会加大。
 对于普通的表而言,做move操作室理所当然,Oracle提供的方式很直接快捷。当然了这个命令也不是高可用的范畴。但是对于数据重组还是很方便快捷的。

一般来说,如果尝试对分区表进行move操作,会得到如下的错误警告。
SQL> alter table charge move tablespace large_data;
 alter table charge move tablespace large_data
            *
 ERROR at line 1:
ORA-14511: cannot perform operation on a partitioned object

 
这个时候可以使用如下的sql语句生成动态sql来做partition级别的move操作。
 比如对下面3个大表,如下的sql就可以生成成百上千条语句来完成partition级别的move操作。

select 'alter table '||table_name||' move partition '||partition_name||' tablespace large_data;' from user_tab_partitions where table_name in ('CHARGE','MEMO','CHARGE_REL')

如果表中含有lob字段,可能会碰到如下的问题

alter table memo move partition xxxx tablespace large_data;

          *
 ERROR at line 1:
 ORA-01658: unable to create INITIAL extent for segment in tablespace DATAS01

 碰到这种问题,一般有以下的几种原因,一种需要查看quota的情况,是否在对应的表空间中含有足够的quota
一种就是查看表空间的存储情况,是否有足够的空间。
 如果空间有限,而且有的分区没有数据,可以开启延迟加载的方式。启用deferred_segment

 expdp/impdp
使用数据泵是一种很好的选择,可以很方便的进行数据结构的dump到处,然后在导入的时候直接做remap_tablespace,这个功能是exp/imp所无法企及的。
 推荐使用impdp的remap功能。

perl/shell
当然了,可以利用exp+imp+shell/perl的方式来解析dump文件
 可以参考如下的博文。

里面详细讨论了解析dump文件的一些细节。

dbms_metadata.get_ddl
如果源shema可以随时访问到,在条件允许的时候可以直接通过dbms_metadata来生成对应的创建语句,可以在此基础上进行表空间的重新手工mapping。
 这个过程看似简单,其实还要考虑很多的细节。分区的分区太多,很容易就超过最大字符长度了,需要自己把握控制。


exchange partition
这种方式可能风险有些大,不过在某些情况下也是一种方案,可以通过exchange partition的形式来完成表空间的重新映射。
 使用普通表来和分区做一个交换。

 不过以上的方法都不太适合高可用的情况,,不过downtime的时间也是需要考虑的,需要最大程度的减少操作时间,毕竟使用分区表的环境中,数据都是很大的,这个也需要大家斟酌。表空间的变更是目的,但是数据的重组就牵扯了数据的导出,导入之类的工作,大道至简,但是细节太多,还是需要多加注意。

浅谈Oracle分区表之范围分区

Oracle分区表迁移

Oracle分区表使用实例

Oracle分区表 (Partition Table) 的创建及管理

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