sqlplus连接数的测试

最近测试库上会有很多的连接的问题，很多都是jdbc连接的问题，在此基础上我测试了一下sqlplus连接的情况，根据sqlplus的命令，有conn,disc,disc会断开连接。我想如果不停的conn 而不disc，连接数会不会爆。按照这个思路写了下列的脚本，大体如下。

sqlplus TEST1/TEST1@test <<EOF
select sid,serial#, count(*)from v$session where username='TEST1' group by sid,serial#;
select count(*)from v$session;
conn TESTO1/TESTO1@test
select sid,serial#, count(*)from v$session where username='TESTO1' group by sid,serial#;
select count(*)from v$session;

conn TEST1/TEST1@test
select sid,serial#, count(*)from v$session where username='TEST1' group by sid,serial#;
select count(*)from v$session;
conn TESTO1/TESTO1@test
select sid,serial#, count(*)from v$session where username='TESTO1' group by sid,serial#;
select count(*)from v$session;

...... 可以复制很多如上的部分。但是测试发现，session书依然没有变化。好像是自动关闭了一样。把间隔时间加大，加入sleep,


sqlplus TEST1/TEST1@test <<EOF
select sid,serial#, count(*)from v$session where username='TEST1' group by sid,serial#;
select count(*)from v$session;
!sleep 2
conn TESTO1/TESTO1@test
select sid,serial#, count(*)from v$session where username='TESTO1' group by sid,serial#;
select count(*)from v$session;
!sleep 2
!sleep 5


conn TEST1/TEST1@test
select sid,serial#, count(*)from v$session where username='TEST1' group by sid,serial#;
select count(*)from v$session;
!sleep 2
conn TESTO1/TESTO1@test
select sid,serial#, count(*)from v$session where username='TESTO1' group by sid,serial#;
select count(*)from v$session;
!sleep 2
!sleep 5
.....

结果如下所示,sid对应的serial#会不停的增长。但是上一个session会自动断掉。session总数也不变，看来sqlplus会自动disc。看来性能很好。


SQL> Connected.
SQL> 
       SID    SERIAL#   COUNT(*)
---------- ---------- ----------
      2941       9786          1
      2955      51931          1
SQL> 
  COUNT(*)
----------
        44
SQL> 
SQL> Connected.
SQL> 
       SID    SERIAL#   COUNT(*)
---------- ---------- ----------
      2955      51933          1
SQL> 
  COUNT(*)
----------
        44
SQL> 
SQL> 
SQL> SQL> Connected.
SQL> 
       SID    SERIAL#   COUNT(*)
---------- ---------- ----------
      2941       9786          1
      2955      51935          1
SQL> 
  COUNT(*)
----------
        44
SQL> 
SQL> Connected.
SQL> 
       SID    SERIAL#   COUNT(*)
---------- ---------- ----------
      2955      51937          1
SQL> 
  COUNT(*)
----------
        44

SQL> 
SQL> 
SQL> SQL> Connected.
SQL> 
       SID    SERIAL#   COUNT(*)
---------- ---------- ----------
      2941       9786          1
      2955      51939          1
SQL> 
  COUNT(*)
----------
        44
SQL> 
SQL> Connected.
SQL> 
       SID    SERIAL#   COUNT(*)
---------- ---------- ----------
      2955      51941          1

SQL> 
  COUNT(*)
----------
        44