Could we autoextend a datafile when it's size hits a defined threshold

Hi all,
I have one doubt, could we be able to autoextend a tablespace datafile when it's size hits a defined threshold? For example if my datafile size is 10G, and the autoextend is on,
1. will there be any options to grow it's size automatically (say when the usage reaches 9.5G, size of the datafile should automatically be extended to 11G) ?
2. And if we are using auto extend on for a data file, will there be any performance impact at the time when the size of the datafile gets full during some transactions and the datafile is about to extend to the next size ? I mean from the application point of view, will it behave the same way as some transactions(insertions) takes place in a datafile that already have enough free space for insertion?
Thanks in advance

Just to add few points to what Sybrand has mentioned,
You can't ask Oracle to add a specific amount of free space. It'll extent by extent.
Performance impact will be there anyway as the process trying to write the data have to wait until Oracle allocates free blocks.
So if you feel, your datafiles will be filled up with a high frequency, better to use some fairly large value for the parameter nextextent. So whenever the DBWR make a call to the extents to be added, Oracle will add extents of big sizes and can reduce the frequency of calls b/w dbwr and the extents allocation process.
btw, Please mark the question as 'answered' if you feel you got the needed information. This will save the time of the people who may answer an already answered question.
regards,
CSM
Edited by: CSM.DBA on Aug 11, 2012 8:36 PM

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