Locally vs dictionary managed tablespaces

Hi

Because of another thread in this NG, I wanted to find out about locally managed tablespaces. The key phrase I found is:

Locally managed tablespaces track all extent information in the tablespace itself, using bitmaps, resulting in the following benefits: <list of benefits, many starting with improved...>

What does it mean, the extent information is in the tablespace itself. Where is it stored in dictionary managed tablespaces? What is the extent information anyway?

Tnx

Rene

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