這個問題既與

在DB端的shared_servers參數(shù)控制server是否能接受share server連接,但是，client可以通過在TNSname.ora 來設(shè)置強制使用DEDICATED
如下，4種情況：
DB shared_servers = 0 , TNSname.ora server=shared或者不設(shè)置 ==> DEDICATED連接
DB shared_servers = 0 , TNSname.ora server=DEDICATED ==> DEDICATED連接
DB shared_servers > 0 , TNSname.ora server=DEDICATED ==> DEDICATED連接
DB shared_servers > 0 , TNSname.ora server=shared或者不設(shè)置 ==> Shared連接