[20191113]oracle共享連線模式埠2.txt

[20191113]oracle共享連線模式埠2.txt

--//昨天的測試連結：http://blog.itpub.net/267265/viewspace-2663651/=>[20191112]oracle共享連線模式埠.txt
--//連結裡面還提到
--//可以執行如下，kill D000程式，自己也測試看看。
--//alter system shutdown immediate 'D000';

1.環境:
SYS@book> @ ver1
PORT_STRING                    VERSION        BANNER
------------------------------ -------------- --------------------------------------------------------------------------------
x86_64/Linux 2.4.xx            11.2.0.4.0     Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production

SYS@book> show parameter dispatchers
NAME            TYPE    VALUE
--------------- ------- -------------------------------------
dispatchers     string  (PROTOCOL=TCP) (SERVICE=book,bookXDB)
max_dispatchers integer

SYS@book> create pfile='/tmp/@.ora' from spfile;
File created.
--//儲存1份pfile引數檔案.

# netstat -tunlp | egrep "Active|Proto|ora_[ds]"
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address               Foreign Address             State       PID/Program name
tcp        0      0 :::38229                    :::*                        LISTEN      36466/ora_d000_book
udp        0      0 ::1:57385                   :::*                                    36466/ora_d000_book
udp        0      0 ::1:11314                   :::*                                    36468/ora_s000_book

2.kill d000:

SYS@book> alter system shutdown immediate 'D000';
System altered.
--//alert.log出現:
Wed Nov 13 08:34:13 2019
idle dispatcher 'D000' terminated, pid = (19, 1)

# netstat -tunlp | egrep "Active|Proto|ora_[ds]"
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address               Foreign Address             State       PID/Program name
udp        0      0 ::1:11314                   :::*                                    36468/ora_s000_book

# ps -ef | grep ora_[sd]000
oracle   36468     1  0 08:33 ?        00:00:00 ora_s000_book
--//ora_d000_book程式消失.等了N久也沒有出現.

>sqlplus scott/book@192.168.100.78:1521/book
SCOTT@192.168.100.78:1521/book> @ spid
       SID    SERIAL# PROCESS                  SERVER    SPID                     PID  P_SERIAL# C50
---------- ---------- ------------------------ --------- -------------------- ------- ---------- -------------------------------------------------
       267          3 7652:8308                DEDICATED 36540                     19          3 alter system kill session '267,3' immediate;
--//可以發現這個時候登入選擇的是DEDICATED模式.注意我這裡配置book支援2種服務模式.

d:\tools\sqltemp>sqlplus -s -l scott/book@192.168.100.78:1521/book:SHARED
ERROR:
ORA-12520: TNS:listener could not find available handler for requested type of
server
SP2-0751: Unable to connect to Oracle.  Exiting SQL*Plus

SYS@book> alter system shutdown immediate 'S000';
alter system shutdown immediate 'S000'
*
ERROR at line 1:
ORA-00127: dispatcher S000 does not exist

--//我以前的做法是kill ora_s000_book程式.

SYS@book> alter system set dispatchers='(PROTOCOL=TCP) (SERVICE=book,bookXDB)' scope=memory;
System altered.

#  netstat -tunlp | egrep "Active|Proto|ora_[ds]"
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address               Foreign Address             State       PID/Program name
tcp        0      0 :::53018                    :::*                        LISTEN      36624/ora_d000_book
udp        0      0 ::1:51280                   :::*                                    36624/ora_d000_book
udp        0      0 ::1:11314                   :::*                                    36468/ora_s000_book
--//對比前面的測試監聽埠發生了變化.

# ps -ef | grep ora_[sd]000
oracle   36468     1  0 08:33 ?        00:00:00 ora_s000_book
oracle   36624     1  0 08:44 ?        00:00:00 ora_d000_book

d:\tools\sqltemp>sqlplus -s -l scott/book@192.168.100.78:1521/book
@ spid
       SID    SERIAL# PROCESS                  SERVER    SPID                     PID  P_SERIAL# C50
---------- ---------- ------------------------ --------- -------------------- ------- ---------- --------------------------------------------------
       281          7 7772:4532                SHARED    36468                     20          1 alter system kill session '281,7' immediate;
--//可以發現這個時候登入選擇的是SHARED模式.
--//換一句話講這個修改dispatchers生效不需要重啟服務.

3. 修改dispatchers引數:
alter system set dispatchers=
'(address=(partial=true)(protocol=tcp)(host=192.168.100.78)(port=30000))(dispatchers=1)(SERVICE=book,bookXDB)',
'(address=(partial=true)(protocol=tcp)(host=192.168.100.78)(port=30005))(dispatchers=1)(SERVICE=book,bookXDB)'
scope=memory sid='*';

--//注:scope=memory.
--//修改前:
#  netstat -tunlp | egrep "Active|Proto|ora_[ds]"
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address               Foreign Address             State       PID/Program name
tcp        0      0 :::53018                    :::*                        LISTEN      36624/ora_d000_book
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
udp        0      0 ::1:51280                   :::*                                    36624/ora_d000_book
udp        0      0 ::1:11314                   :::*                                    36468/ora_s000_book

--//修改後:
#  netstat -tunlp | egrep "Active|Proto|ora_[ds]"
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address               Foreign Address             State       PID/Program name
tcp        0      0 192.168.100.78:30005        0.0.0.0:*                   LISTEN      36678/ora_d002_book
tcp        0      0 192.168.100.78:30000        0.0.0.0:*                   LISTEN      36676/ora_d001_book
tcp        0      0 :::53018                    :::*                        LISTEN      36624/ora_d000_book
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
udp        0      0 ::1:40457                   :::*                                    36678/ora_d002_book
udp        0      0 ::1:51280                   :::*                                    36624/ora_d000_book
udp        0      0 ::1:64603                   :::*                                    36676/ora_d001_book
udp        0      0 ::1:11314                   :::*                                    36468/ora_s000_book
--//注意下劃線的埠沒有變化.

SYS@book> show parameter dispatchers
NAME             TYPE      VALUE
---------------- --------- ----------------------------------------------------------------------------------------------------
dispatchers      string    (PROTOCOL=TCP) (SERVICE=book,bookXDB), (address=(partial=true)(protocol=tcp)(host=192.168.100.78)(po
                           rt=30000))(dispatchers=1)(SERVICE=book,bookXDB), (address=(partial=true)(protocol=tcp)(host=192.168.
                           100.78)(port=30005))(dispatchers=1)(SERVICE=book,bookXDB)
max_dispatchers  integer
--//有時候真心覺得oracle真變態,它是在原來基礎上追加了引數dispatchers的內容.

SYS@book> show spparameter dispatchers
SID      NAME            TYPE     VALUE
-------- --------------- -------- --------------------------------------
*        dispatchers     string   (PROTOCOL=TCP) (SERVICE=book,bookXDB)
*        max_dispatchers integer

--//繼續測試:
alter system set dispatchers=
'(address=(partial=true)(protocol=tcp)(host=192.168.100.78)(port=30000))(dispatchers=1)(SERVICE=book,bookXDB)',
'(address=(partial=true)(protocol=tcp)(host=192.168.100.78)(port=30005))(dispatchers=1)(SERVICE=book,bookXDB)'
scope=both sid='*';
--//注:scope=both

SYS@book> show parameter dispatchers
NAME             TYPE    VALUE
---------------- ------- ----------------------------------------------------------------------------------------------------
dispatchers      string  (PROTOCOL=TCP) (SERVICE=book,bookXDB), (address=(partial=true)(protocol=tcp)(host=192.168.100.78)(po
                         rt=30000))(dispatchers=1)(SERVICE=book,bookXDB), (address=(partial=true)(protocol=tcp)(host=192.168.
                         100.78)(port=30005))(dispatchers=1)(SERVICE=book,bookXDB)
max_dispatchers  integer

SYS@book> show spparameter dispatchers
SID      NAME             TYPE     VALUE
-------- ---------------- -------- ----------------------------------------------------------------------------------------------------
*        dispatchers      string   (PROTOCOL=TCP) (SERVICE=book,bookXDB)
*        dispatchers      string   (address=(partial=true)(protocol=tcp)(host=192.168.100.78)(port=30000))(dispatchers=1)(SERVICE=book,bookXDB)
*        dispatchers      string   (address=(partial=true)(protocol=tcp)(host=192.168.100.78)(port=30005))(dispatchers=1)(SERVICE=book,bookXDB)
*        max_dispatchers  integer

--//可以發現這樣修改實際上是追加內容.oracle有時候難以理解.

4.連線測試:
d:\tools\sqltemp>sqlplus -s -l scott/book@192.168.100.78:30000/book @spid
       SID    SERIAL# PROCESS                  SERVER    SPID                     PID  P_SERIAL# C50
---------- ---------- ------------------------ --------- -------------------- ------- ---------- --------------------------------------------------
       281         11 9076:7200                SHARED    36468                     20          1 alter system kill session '281,11' immediate;
--//SERVER=SHARED,spid=36468

# ps -ef | grep 3646[8]
oracle   36468     1  0 08:33 ?        00:00:00 ora_s000_book
--//sqlplus scott/book@192.168.100.78:30005/book 也是ok的.

5.收尾還原:
--//略.
--//參考連結:http://blog.itpub.net/267265/viewspace-2663651/=>[20191112]oracle共享連線模式埠.txt

6.總結:
--//不需要重啟引數dispatchers就能生效.
--//修改dispatchers引數,內容在原來基礎上追加