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Don Burleson Blog 







Compress Oracle tablespaces

Oracle Database Tips by Donald BurlesonMarch 26, 2015

Question:  I want to compress my Oracle tablespace, that is, compress all objects within the tablespace.  How do I compress a tablespace?

Answer:  There many ways to compress tablespaces, please see these notes on Oracle data compression..   Normally, you would need to export all data, drop and re-define the tablespace as compressed and reload the tablespace.

Here is an example of Oracle tablespace compression:

create smallfile tablespace
   '/u01/app/oracle/oradata/orasid/file1.dbf' size 10m autoextend
space management auto
default compress for oltp

Oracle does have an online command that will compress as-of the time that the command is issued, leaving any existing data in the tablespace uncompressed:

 alter tablespace <tablespace_name> default compress;

Remember, this tablespace compression is only valid for DML statements run after " alter tablespace users default compress":

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