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Calculating the next extent

Can you please provide me with a specific formula for calculating the next extent? Say if you have an initial 10M, next 10M, minextents 1 and max extents 50, how would you calculate the size of the 18th extent?

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The answer depends on factors you have not given.

If you are using Dictionary Managed Tablespaces, then the next extent will be the most current extent plus a percentage increase defined by the segment's PCTINCREASE storage parameter.

If you are using Locally Managed Tablespaces (LMT), then Oracle will automatically calculate your next extent size for you. I highly recommend using LMTs and quit worrying about extent sizes!

This was first published in May 2005

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