CRS_LIMIT_NPROC=16384 in s_crsconfig_hostname_env.txt file

 

Looks like there is a bug in the Oracle. Even after increasing the OS variables, “ORACLE” is not picking up the values.

Looks like Listener has a default max limit of 16384 in Oracle file , so it will not allowing any listener connections more than the said limit.

 

• ps -ef| grep LOCAL |wc -l               ---------- make sure this is less than 16384  ( if this value is close then new sessions will not be made using listener.

          Note: this is nothing to do with processes that added in the linux config files.

------Here are the steps we need to do to increase the value in this file.

 

$grid_home/crs/install/s_crsconfig_hostname_env.txt

 

Change this value “CRS_LIMIT_NPROC=16384"  To more value to accept more connections.

 This value is picked up by CRS when we start the oracle DB.

Note: we need to Bounce the CRS to take effect.

avoid Cartesian merge join in the explain plan.

Cartesian Merge Join are sometimes more expensive. takes long time to run and uses resources.

To avoid the cartesian merge join you can disable  using below command to make it run in that session. You dont want to apply this change to the DB as it would need oracle support to disable it.

alter session set "_optimizer_cartesian_enabled"=FALSE;