Reclamining Space Within ASSM Segments
- Online and in-place operation
- Applicable only to segments residing in ASSM tablespaces
- Candidate segment types:
- Heap-organized tables and index-organized tables
- Indexes
- Partitions and subpartitions
- Materialized views and materialized view logs
Segment Advisor:Overview
Managing Resumable Space Allocation
A resumable statement:
- Enables you to suspend large operations instead of receiving an error
- Gives you a chance to fix the problem while the operation is suspended,rather than starting over
- Is suspended for the following conditions
- Out of space
- Maxmum extents reached
- Space quota exceeded
- A resumable statement can be suspended and resumed multiple times.
- Online and in-place operation
使用ASSM回收空间，支持在线操作并且不需要分配额外的表空间分配，即可实现.
- Applicable only to segments residing in ASSM tablespaces
只有采用了ASSM的表空间，才可以使用自动收缩功能.
表中带有long类型的，也不支持收缩.
On commited materialized view也是不支持收缩的.
包含了基于函数的索引表，也不支持收缩.
Segment Advisor：擅长段空间管理，节约空间，提高效率.
Segment Advisor检查AWR中的数据，进行采样分析，寻找可以回收的空间，产生报告;
调用方式：自动执行(ADDM执行完成之后，自动执行段管理专家)
手工的执行
如何手工回收段空间？参照博文http://www.cnblogs.com/arcer/archive/2013/06/09/3128171.html