unknow:靜態注冊

ready或blocked：動態注冊

a、如果先啟動監聽，后啟動數據庫
Service "PLSExtProc" has 1 instance(s).
? Instance "PLSExtProc", status UNKNOWN, has 1 handler(s) for this service...
Service "orcl" has 2 instance(s).
??Instance "ORCL", status UNKNOWN, has 1 handler(s) for this service...
? Instance "orcl", status READY, has 1 handler(s) for this service...
Service "orclXDB" has 1 instance(s).
? Instance "orcl", status READY, has 1 handler(s) for this service...
The command completed successfully

從顯示信息可以看出這種情況下既有動態注冊又有靜態注冊

?(Service "PLSExtProc" 是在 listener.ora 文件中為數據庫實例缺省配置的，允許PL/SQL包訪問外部程序；
??? Service "orcl" 也是在 listener.ora 文件中配置，是每個數據庫連接使用的標準模式；
??? Service "orclXDB" 是Oracle 9i以后版本創建數據庫時默認包含的XML DB特性，提供http、ftp等服務，在初始化文spfile（或pfile）中定義)

b、重啟監聽

Service "PLSExtProc" has 1 instance(s).
? Instance "PLSExtProc", status UNKNOWN, has 1 handler(s) for this service..
Service "orcl" has 1 instance(s).
??Instance "ORCL", status UNKNOWN, has 1 handler(s) for this service...
Service "orcl1" has 1 instance(s).
? Instance "ORCL", status UNKNOWN, has 1 handler(s) for this service...
The command completed successfully

從顯示信息可以看出這種情況下動態注冊監聽失敗

c、刪除listener.ora,重啟監聽

Listening Endpoints Summary...
? (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=MICROSOF-3033D5)(PORT=1521)))
The listener supports no services
The command completed successfully

從顯示信息可以看出這種情況下動態注冊監聽和靜態注冊監聽都失敗

等待片刻（1min）。。。。

Service "orcl" has 1 instance(s).
? Instance "orcl", status READY, has 1 handler(s) for this service...
Service "orclXDB" has 1 instance(s).
? Instance "orcl", status READY, has 1 handler(s) for this service...
The command completed successfully

從顯示信息可以看出這種情況下動態注冊監聽成功,pomn定時向監聽器注冊

?

d、修改listener.ora為SID_LIST_LISTENER =
? (SID_LIST =
??? (SID_DESC =
????? (PROGRAM = extproc)
????? (SID_NAME = PLSExtProc)
????? (ORACLE_HOME = D:/oradata/orcl)
??? )
? )重啟監聽

Service "PLSExtProc" has 1 instance(s).
? Instance "PLSExtProc", status UNKNOWN, has 1 handler(s) for this service...
The command completed successfully

從顯示信息可以看出這種情況下動態注冊監聽失敗,靜態注冊數據庫實例失敗

等待片刻（1min）。。。。

Service "orcl" has 1 instance(s).
? Instance "orcl", status READY, has 1 handler(s) for this service...
Service "orclXDB" has 1 instance(s).
? Instance "orcl", status READY, has 1 handler(s) for this service...
The command completed successfully

從顯示信息可以看出這種情況下動態注冊監聽成功,pomn定時向監聽器注冊

總結

重啟監聽并不一定都造成動態注冊監聽的失敗：如果listener.ora文件被刪除時，這種現象只是暫時的，oracle中pmon進程會定時像監聽器動態注冊（個人觀點）

總結

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