应用程序连接测试数据库时报ORA-12516：TNS:listener could not find available handler with matching protocol stack
检查监听日志文件,发现大量的TNS-12516错误
cd /u01/app/oracle/product/10.2.0/db_1/network/log
more listener.log
TNS-12516: TNS:listener could not find available handler with matching protocol stack
13-MAY-2014 14:49:35 * (CONNECT_DATA=(SERVICE_NAME=xxx)(CID=(PROGRAM=c:\windows\system32\inetsrv\w3wp.exe)(HOST=GET08C0058)(USER=SYSTEM))) * (ADDRESS=(PROTOCOL=tcp)(HOST=192.168.xxx.xxx)(PORT=4594)) * establish * xxx * 12516