【監聽】listener.ora檔案理解
listener.ora檔案裡面配置的內容主要是靜態監聽，需要listener.ora檔案主要為了新增靜態監聽global_dbname\sid_name（SID_LIST_LISTENER）和新增額外的監聽器名稱
預設的監聽器host是hostname不是ip、埠是1521、協議是TCP，無listener.ora檔案情況下預設監聽器繼續存在（監聽器名稱預設LISTENER,host是hostname不是ip、埠是1521、協議是TCP），如果需要向非預設監聽註冊，則需要配置local_listener引數
註冊是把資料庫資訊作為一個服務註冊（註冊內容是servcice_name和instance_name）到監聽中的host和port中，listener.ora中如果host配置的資訊為ip，但是實際伺服器上不存在這個ip則無法註冊，如果host中配置的是伺服器名稱，而伺服器名稱不存在或伺服器名在/etc/hosts中對應的ip不存在或與實際IP不一致則無法註冊，DB預設監聽器的host是hostname
listener.ora中靜態監聽的SID_NAME的值一定要區分大小寫
listener.ora檔案中不會出現service_name或service_names，只有GLOBAL_DBNAME和SID_NAME，出現service_name或service_names後lsnrctl start listenername會報錯
靜態監聽如果有非預設監聽器listener以外的其他名稱的監聽器，則操作方式如下，前提是兩個監聽中的port和key不能一樣，否則也只能啟動一個。
lsnrctl start listenername
lsnrctl status listenername
lsnrctl stop listenername
安裝完資料庫軟體時預設的listener.ora如下，只有預設監聽的資訊
LISTENER =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521))
(ADDRESS = (PROTOCOL = TCP)(HOST = M0776)(PORT = 1521))
)
)
新增一個靜態監聽listener2後如下
LISTENER2 =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = 10.98.0.31)(PORT = 1522))
)
SID_LIST_LISTENER2 =
(SID_LIST =
(SID_DESC =
(GLOBAL_DBNAME = luxus)
(ORACLE_HOME = E:\app\luxus.liao\product\11.1.0\db_1)
(SID_NAME = luxus)
)
)
LISTENER =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = M0776)(PORT = 1521))
)
(DESCRIPTION =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521))
)
)
listener.ora想對監聽名為listener的監聽新增一個靜態註冊，只有如下內容時，是沒有靜態註冊的
LISTENER =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = 10.98.0.122)(PORT = 1521))
)
)
[oracle@DEMOSFCS admin]$ lsnrctl status
LSNRCTL for Linux: Version 11.2.0.1.0 - Production on 14-MAY-2015 20:08:31
Copyright (c) 1991, 2009, Oracle. All rights reserved.
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=10.98.0.122)(PORT=1521)))
STATUS of the LISTENER
------------------------
Alias LISTENER
Version TNSLSNR for Linux: Version 11.2.0.1.0 - Production
Start Date 14-MAY-2015 20:03:59
Uptime 0 days 0 hr. 4 min. 32 sec
Trace Level off
Security ON: Local OS Authentication
SNMP OFF
Listener Parameter File /u01/app/oracle/product/11.2.0/db_1/network/admin/listener.ora
Listener Log File /u01/app/oracle/diag/tnslsnr/DEMOSFCS/listener/alert/log.xml
Listening Endpoints Summary...
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=10.98.0.122)(PORT=1521)))
Services Summary...
Service "DEMOSFCS" has 1 instance(s).
Instance "DEMOSFCS", status READY, has 1 handler(s) for this service...
Service "DEMOSFCSXDB" has 1 instance(s).
Instance "DEMOSFCS", status READY, has 1 handler(s) for this service...
The command completed successfully
內容是如下時（新增了SID_LIST_LISTENER資訊），才有靜態註冊
LISTENER =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = 10.98.0.122)(PORT = 1521))
)
)
SID_LIST_LISTENER =
(SID_LIST =
(SID_DESC =
(GLOBAL_DBNAME = DEMOSFCS)
(ORACLE_HOME = /u01/app/oracle/product/11.2.0/db_1)
(SID_NAME = DEMOSFCS)
)
(SID_DESC =
(SID_NAME = PLSExtProc)
(ORACLE_HOME = /u01/app/oracle/product/11.2.0/db_1)
(PROGRAM = extproc)
)
)
[oracle@DEMOSFCS admin]$ lsnrctl status
LSNRCTL for Linux: Version 11.2.0.1.0 - Production on 14-MAY-2015 20:08:41
Copyright (c) 1991, 2009, Oracle. All rights reserved.
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=10.98.0.122)(PORT=1521)))
STATUS of the LISTENER
------------------------
Alias LISTENER
Version TNSLSNR for Linux: Version 11.2.0.1.0 - Production
Start Date 14-MAY-2015 20:03:59
Uptime 0 days 0 hr. 4 min. 42 sec
Trace Level off
Security ON: Local OS Authentication
SNMP OFF
Listener Parameter File /u01/app/oracle/product/11.2.0/db_1/network/admin/listener.ora
Listener Log File /u01/app/oracle/diag/tnslsnr/DEMOSFCS/listener/alert/log.xml
Listening Endpoints Summary...
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=10.98.0.122)(PORT=1521)))
Services Summary...
Service "DEMOSFCS" has 2 instance(s).
Instance "DEMOSFCS", status UNKNOWN, has 1 handler(s) for this service...
Instance "DEMOSFCS", status READY, has 1 handler(s) for this service...
Service "DEMOSFCSXDB" has 1 instance(s).
Instance "DEMOSFCS", status READY, has 1 handler(s) for this service...
Service "PLSExtProc" has 1 instance(s).
Instance "PLSExtProc", status UNKNOWN, has 1 handler(s) for this service...
The command completed successfully
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