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，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

--当前的连接数
select count(*) from v$process;
--设置的最大连接数（默认值为200）
select value from v$parameter where name = \'processes\';
------------------------------------------------
--查看当前的session使用情况
SELECT  Count(*) FROM v$session;
或
SELECT   username, machine, program, status, COUNT (machine) AS
FROM v$session
GROUP BY username, machine, program, status
ORDER BY machine;
--查看系统最大session数
select value from v$parameter where name = \'sessions\';

转载请注明出处：http://blog.csdn.net/pan_tian/article/details/7730028
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Oracle EBS连接数不足

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