Increase in memory use when database server switches

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http://serverfault.com – I have an asp.net 4.o application running on window server 2008 and a oracle 11G database server running on linux. There is two database server with same virtual ip. Recently some how one database server went down and another database server starting working. Every thing went perfectly on database server site with small problem of oracle listener But on my application server memory start increasing and went up to above 15 GB almost 99% use. Normaly it uses 2 gb of memory. I am using ado.net to connect oracle. My application has properly closed database connection. I was not able to figure out (HowTos)