Few Questions.

Gurus,
1.      How does one know that there is a tablepspace fragemntion and
once detected how do we remove that.
2.      What are chained rows?
3.      While doing an export what does compress = y and consistent = y
means?
4.      What does analyze tablespace with % does?
5.      Why is the purpose of repository in OEM?
 
Would appreciate an answer on these.
 
TIA
Vinod.
 
 
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