title: Very long SQL connection opening time
body: <p>Recently, We have migrated our Oracle 9.2.0.6 production database from Windows 32bit RAC (2 nodes) to Linux 64 bit environment. Linux 64 bit environment has 8 times more memory than Windows 32 bit environment and Linux 64 bit has faster disk ( RAID 10 compare to RAID 5 of windows). </p>
  
  <p>However, after this migration, we have noticed sql connection time has been increased significantly. Some time, it is taking 16 seconds to open a connection. We have used different driver (JDBC, ODBC, OCI) and SQLPlus. But, we have noticed no difference in sql connection time. We have investigated network, but noticed no problem with network.</p>
  
  <p>Some time, it is taking around 16 seconds to open a single connection. This database has around 50000 user schema. </p>
  
  <p>Can anybody tell me what can be done to reduce the connection opening time? Your help would be appreciated.</p>