Need to perform Oracle DB Optimization in Solaris

Hi All,

I want to shrink my Oracle DB in production environment, because it was occupied 92% of storage allocated.

I have checked mos of the tablespaces are also reached to 98%, I have some old spool data around 170 GB showing in LOB segment, so If I delete that data, how can I retain my free space?.

Or any other way to shrink the DB inorder to increase the performance.

Kindly help me to resolve this problem.