LMT and DMT tablespace

Hi all,
Can you please explain me what happens while inserting/deleting bulk data in tables, which in LMT and DMT tablespace? How the blocks are utilized and how the information about blocks are maintained?
Thanks in advance,
Giridharan

Well, that's an old question.
Dictionary Managed Tablespace, as the name suggests mangages the info about the used/free blocks of the datafile within the data dictionary. The two tables that are used are UET$ and FET$. This means whenever you do any space related operations over the tablespace, Oracle has to do couple of additional tasks like
1) It has to run recurvive calls over these tables to get the info about the available space. So if the space comes out to be okay with your space related operation, like creating table , Oracle will let you go ahead. Surely enough, this is slow.
2) Your updations or any space related opeations will lead to the changes(DML) over these data dictionaries as well. This will cause extra Redo/Undo to be generated. Though, the extent of it wil not be much but still, its going to be htere and if the activity is too much, it may add up to a large chunk.
3) With any space related operations, there will be some free space that will come up. But mostly, this space will be non contiegious. This will lead to fragmentation in the datafile.
Due to these problems, Oracle gave the idea of LMT. This leads to a total change of algorithm. LMT, as the name suggests, stands for Locally Managed Tablespace. This means that the space related info of the datafile is maintained with the datafile's header itself , in bitmap blocks. These blocks are capable enough to hold entire data file within very few blocks. So this will be very fast and because they are just bits, they won't generate any additional redo/undo as well. This leads to a much better and scalable management of the datafile space.
I hope this does clear some things.
HTH
Aman....

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