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Don Burleson Blog 







  Reorganize a partitioned table tips

Oracle Database Tips by Donald BurlesonApril 3, 2015

Question:  How do I reorganize a partitioned table?  I want to re-claim the space.  Can I reorganize a single partition?

Answer:  First, it is not always a good idea to reorganize a partitioned table because the partitioning has made a conscious decision to "spread out" the data. The idea behind partitioning is to sacrifice efficient disk utilization (disk is cheap) in return for a more efficient data organization where like-minded data are grouped together. See my notes on Oracle partitioning tables.  Hence, I rarely recommend reorganizing a partitioned table.

The dbms_redefinition utility can be used for converting a non-partitioned table to a partitioned table and vice versa, and it can also be used to reorganize a partitioned table.
See my notes on dbms_redefinition which use CTAS (create table as select) to copy all of the rows of the table into a new table definition, residing a a tablespace with different partitioning defined.

Another approach: alter table move partition

If you intend to change the partitioning of a table, you can use the use alter table ... move partition tablespace xxx syntax, and then rename the tablespace.   Note that his ONLY WORKS when the tablespace matches the partitions one-for-one:
alter table mytab move partition "2013-12-31" tablespace "new-2013-12-31";
rename tablespace "2013-12-31"     to "old-2013-12-31";

rename tablespace "new-2013-12-31" to "2013-12-31"; 
drop tablespace "old-2013-12-31";

You can also use the NOLOGGING clause wiht ehe alter table xxx move partition::

alter table mytab move partition part1 tablespace ts_new NOLOGGING;
Beware of the error "ORA-14257: cannot move partition other than a Range or Hash partition".

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