unknow:靜態(tài)注冊(cè)

ready或blocked：動(dòng)態(tài)注冊(cè)

a、如果先啟動(dòng)監(jiān)聽，后啟動(dòng)數(shù)據(jù)庫(kù)
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(dòng)態(tài)注冊(cè)又有靜態(tài)注冊(cè)

?(Service "PLSExtProc" 是在 listener.ora 文件中為數(shù)據(jù)庫(kù)實(shí)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(gè)數(shù)據(jù)庫(kù)連接使用的標(biāo)準(zhǔn)模式；
??? Service "orclXDB" 是Oracle 9i以后版本創(chuàng)建數(shù)據(jù)庫(kù)時(shí)默認(rèn)包含的XML DB特性，提供http、ftp等服務(wù)，在初始化文spfile（或pfile）中定義)

b、重啟監(jiān)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(dòng)態(tài)注冊(cè)監(jiān)聽失敗

c、刪除listener.ora,重啟監(jiān)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(dòng)態(tài)注冊(cè)監(jiān)聽和靜態(tài)注冊(cè)監(jiān)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(dòng)態(tài)注冊(cè)監(jiān)聽成功,pomn定時(shí)向監(jiān)聽器注冊(cè)

?

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(jiān)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(dòng)態(tài)注冊(cè)監(jiān)聽失敗,靜態(tài)注冊(cè)數(shù)據(jù)庫(kù)實(shí)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(dòng)態(tài)注冊(cè)監(jiān)聽成功,pomn定時(shí)向監(jiān)聽器注冊(cè)

總結(jié)

重啟監(jiān)聽并不一定都造成動(dòng)態(tài)注冊(cè)監(jiān)聽的失敗：如果listener.ora文件被刪除時(shí)，這種現(xiàn)象只是暫時(shí)的，oracle中pmon進(jìn)程會(huì)定時(shí)像監(jiān)聽器動(dòng)態(tài)注冊(cè)（個(gè)人觀點(diǎn)）

總結(jié)

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