Best way to correct Tablespace fragmentation?

Dear DBAs,
The following query returns tablespace fragmentation:
select
tablespace_name,
count(*) free_chunks,
decode(
round((max(bytes) / 1024000),2),
null,0,
round((max(bytes) / 1024000),2)) largest_chunk,
nvl(round(sqrt(max(blocks)/sum(blocks))*(100/sqrt(sqrt(count(blocks)) )),2),
0) fragmentation_index
from
sys.dba_free_space
group by
tablespace_name
order by
2 desc, 1;
I have 3 tablespaces that are Locally Managed and suffer heavyt fragmentation. I just received the task of tuning this database and from what I could tell the fragmentation originated from a number of bad practices from past DBAs and also, some bizarre structures in certain tables.
My question is: what would be the best way to correct tablespace fragmentation LMT? I'm thinking export - drop - import to reorganize all blocks within the tablespace?

Alvaro wrote:
Dear DBAs,
The following query returns tablespace fragmentation:
select
tablespace_name,
count(*) free_chunks,
decode(
round((max(bytes) / 1024000),2),
null,0,
round((max(bytes) / 1024000),2)) largest_chunk,
nvl(round(sqrt(max(blocks)/sum(blocks))*(100/sqrt(sqrt(count(blocks)) )),2),
0) fragmentation_index
from
sys.dba_free_space
group by
tablespace_name
order by
2 desc, 1;
I have 3 tablespaces that are Locally Managed and suffer heavyt fragmentation. I just received the task of tuning this database and from what I could tell the fragmentation originated from a number of bad practices from past DBAs and also, some bizarre structures in certain tables.
My question is: what would be the best way to correct tablespace fragmentation LMT? I'm thinking export - drop - import to reorganize all blocks within the tablespace?In addition to what everyone else notes is the unlikelihood of fragmentation, there may be implicit compaction and skew in your data distribution that could be impacted by export/import. For better or worse.
What bad practices are you referring to? Sometimes practices are inappropriate, sometimes useless, sometimes perfectly understandable. If you don't know about the fragmentation issue, I wonder how well you judge practices. And yes, there are some really bad practices floating about.

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