发现有的时候，EBS会报连接数不足的问题。所以尝试着提高了processes和sessions，EBS安装完之后，数据库init参数processes默认为200,sessions默认为400.这里我把DB的processes和sessions提高到了500和1000。
processes                       = 500    # Max. no. of users x 2
sessions                        = 1000     # 2 X processes

修改完之后，重启DB，参数就会生效。

addbctl.sh stop  
addbctl.sh start

查看参数设置

show parameter processes
show parameter sessions

文章Oracle EBS DB Init Parameters里（见  ），有提到Oracle提供一个init parameter参考的设置。

关于Processes和sessions parameters,init.ora有相关描述
#########
#
# Processes and sessions parameters
#
# A database process can be associated with one or more database
# sessions. For all technology stack components other than Oracle
# Forms, there is a one-to-one mapping between sessions and processes.
#
# For Forms processes, there will be one database session per
# open form, with a minimum of two sessions per Forms user (one
# for the navigator form, and one for the active form).
#
# The sessions parameter should be set to twice the value of the
# processes parameter.
#
#########
















另外如何查询当下数据的连接数和最大连接数