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PURPOSE
-------

V$session view showing 'NONE' in server column is not a bug in MTS/Shared Server configuration.

 
SCOPE & APPLICATION
-------------------

This article can be useful for DBA's, Support Engineers to conclude 'NONE' in server column of v$session view
is not a bug in MTS/Shared Server configuration.



Analysis
-----------------------------
 
In MTS/Shared Server configuration when you see value 'NONE' (as shown below), it means there is no task being 
processed by shared server for that session. The server column will infact show status of 'SHARED' if there is 
some task being processed at that particular time by the shared server process for that session.

SQL> select username,server from v$session where program like '%sql%';

USERNAME                       SERVER
------------------------------ ---------
SYS                            DEDICATED
SYSTEM                         SHARED
SCOTT                          NONE

对以上的理解

经过测试发现:当session的status 为active  SERVER为  shared

              当session的status 为active  SERVER为  NONE

测试过程如下:

窗口1

SQL> select username,server from v$session group by username,server;

USERNAME                       SERVER
------------------------------ ---------
                               DEDICATED
SYS                            DEDICATED
SYSTEM                         SHARED

窗口2:

SQL> create table t1 (id number);

Table created.

SQL> 
SQL> 
SQL> select * from t1;

no rows selected

SQL> insert into t1 values(1);

1 row created.

SQL> commit;

Commit complete.

SQL> begin
  2  for a in 1..100000 loop 
  3  insert into t1 values(2);
  4  commit;
  5  end loop;
  6  end;
  7  
  8  /

同时查询窗口1

SQL> select username,server from v$session group by username,server;

USERNAME                       SERVER
------------------------------ ---------
                               DEDICATED
SYS                            DEDICATED
SYSTEM                         SHARED

脚本执行完成后:

SQL> select username,server from v$session group by username,server;

USERNAME                       SERVER
------------------------------ ---------
                               DEDICATED
SYS                            DEDICATED
SYSTEM                         NONE