do I reorganize a partitioned table? I want to
re-claim the space. Can I reorganize a single
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
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
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
alter table mytab
move partition "2013-12-31" tablespace
"2013-12-31" to "old-2013-12-31";
rename tablespace "new-2013-12-31" to
drop tablespace "old-2013-12-31";
You can also use the NOLOGGING clause wiht ehe alter table
xxx move partition::
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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