Serious performance issues and possible memory leak?????

Serious performance issues and possible memory leak?????

 

  

We are running Oracle 8.1.6 on Solaris 2.7 and have been having steady
performance degradatation over the last couple of days.
I've checked in v$sysstat and see the following:
session uga memory 2.5491918486856E15
session uga memory max 1.84467440285901E19


I'm not even sure this matters, but these values seem HUGE!

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