locally managed tablespace and confused fragmentation

Hello

I understand that its impossible to have a locally managed tablespace fragmentation, but when I run the following query I get
select
tablespace_name,
COUNT(*) cnt_free_chunk,
decode( round((max(BYTES) / 1024),2), 
null,0, round((max(BYTES) / 1024),2)) largest_chunk
from dba_free_space
group by tablespace_name
order by 2 desc ,1

TABLESPACE_NAME                CNT_FREE_CHUNK              LARGEST_CHUNK
------------------------------              --------------                         -------------
USR_IDX_TBS                         1739                               2359296
The tablespace shows it was not plugged and uses LMT with SAMS.

user9243284, you should not assimilate several free extensions as meaing the free space is fragmented even for dictionary managed tablespaces, much less for those locally managed.

Really, what determines if the tablespace freespace is fragmented, it's if the available free space can be used or not when objects extend. You must map the extents of tablespace to get a better idea if the number of extensions of the free space indicates a problem could exist.

In the case of a tablespace locally managed with uniform extents, free space fragmentation is impossible, because never available to what extent is the same size for each request for space is satisfied until there is no free extensions.

However when-auto-assignment is a range of sizes of measurement are used where each larger size is a multiple of the previous size, which reduces the changes of Oracle is not able to respond to a request for free measure; However, contrary to belief the automatic assignment method does not eliminate completely the free space fragmentation.

It is always possible to have a request for lack of space automatic sub-allotment when the total free space exceeds the amount of space requested. This can occur in two situations:

First of all, the tablespace has been converted into place of dictionary to locally managed. Existing objects are not affected by the conversion so any existence before the conversion disorder still exists after the conversion.

Second, where there are a few large objects stored with many small objects and the tablespace data files are either fixed in size max extended nearby, then it is possible to have a request for an extension of the free fail even if the total free space is greater than the measure requested. Say you want to 8 M and the tablespace has 40 M free. It may be that none of the extents are contiguous, if the request fails. Now, with a request for 64 M, Oracle will resign the next size measure and use up to 120 degrees of 8 M but more small scale application size are not not resigned in size (at least from my last test).

I had this happen with a product of the vendor who provides the user the ability to create work tables and add indexes via the application. I love the uniform measure for this reason tablespaces.

HTH - Mark D Powell.

Tags: Database

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