Diff betwwen dictionary and locally managed

hai
plz explain me abt diff betwwen dictionary and locally managed

Hi,
Its some of themost hot topics over the internet.Please read the manuals given by Adith they would explain the things.
For starting,
DMT
In the old versions,whenever Oracle usedto allocate space for a datafile and later on, uses that space,it used to maintain the information in some data dictionary tables(hence the name Dictionary managed).This used to create a huge amount of performance impact as for each space operation,there was a check on the data dictionary tables whether the space is there or not?This also used to lead lots of extra undo/redo getting generated because the tables in teh dictionary has to be updated.This wsa a setback.
LMT
Oracle changed the mechanism.Now the same informaiton is maintained with the Datafile header.There is no dependency on the dictionary and hence its more faser.As well this wont generate the extra undo/redo so it will always begood.This is achieved by tracking the space by bits in a seperate segment called bitmap segment.
Well I guess that should be enough,more and much more detail in the docs.So please read them.
Aman....

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