監聽剛剛重啟之後的一段時間會報錯：
sql> conn system/www@testrac
error:
ora-12516: tns: 監聽程式找不到符合協議堆疊要求的可用處理程式
此時檢視監聽狀態：
[oracle@ractest4 ~]$ lsnrctl status
lsnrctl for linux: version 11.1.0.6.0 - production on 26-dec-2013 09:15:20
connecting to (address=(protocol=tcp)(host=)(port=1521))
status of the listener
------------------------
alias listener_ractest4
version tnslsnr for linux: version 11.1.0.6.0 - production
start date 26-dec-2013 09:14:18
uptime 0 days 0 hr. 1 min. 2 sec
trace level off
security on: local os authentication
snmp off
listening endpoints summary...
(description=(address=(protocol=tcp)(host=20.18.15.170)(port=1521)))
(description=(address=(protocol=tcp)(host=20.18.15.135)(port=1521)))
services summary...
service "rac" has 1 instance(s).
instance "rac1", status ready, has 1 handler(s) for this service...
service "racxdb" has 1 instance(s).
instance "rac1", status ready, has 1 handler(s) for this service...
service "rac_xpt" has 1 instance(s).
instance "rac1", status ready, has 1 handler(s) for this service...
the command completed successfully
發現本節點的例項還未動態註冊進來，這種報錯會持續到例項完成動態註冊：
[oracle@ractest4 ~]$ lsnrctl status
lsnrctl for linux: version 11.1.0.6.0 - production on 26-dec-2013 09:15:49
connecting to (address=(protocol=tcp)(host=)(port=1521))
status of the listener
------------------------
alias listener_ractest4
version tnslsnr for linux: version 11.1.0.6.0 - production
start date 26-dec-2013 09:14:18
uptime 0 days 0 hr. 1 min. 31 sec
trace level off
security on: local os authentication
snmp off
listening endpoints summary...
(description=(address=(protocol=tcp)(host=20.18.15.170)(port=1521)))
(description=(address=(protocol=tcp)(host=20.18.15.135)(port=1521)))
services summary...
service "rac" has 2 instance(s).
instance "rac1", status ready, has 1 handler(s) for this service...
instance "rac2", status ready, has 2 handler(s) for this service...
service "racxdb" has 2 instance(s).
instance "rac1", status ready, has 1 handler(s) for this service...
instance "rac2", status ready, has 1 handler(s) for this service...
service "rac_xpt" has 2 instance(s).
instance "rac1", status ready, has 1 handler(s) for this service...
instance "rac2", status ready, has 2 handler(s) for this service...
the command completed successfully
例項完成動態註冊之後，連線時不再報錯ora-12516。
所有車的過橋最短時間
今晚幫朋友助攻遇到了一道題，當時有思路但是沒有寫出來，後來結合牛客網上的解答寫了出來，也不知道具體能ac多少道題，先放在這裡等大家指點吧 有n輛車藥陸續通過一座最大承重為w的橋，其中第i輛車的重量為w i 通過橋的時間為t i 要求第i輛車上橋的時間不早於第i 1輛車上橋的時間，任意時刻橋上所有車輛...
短時間建立部落格內容的5個方法
能否堅持寫部落格的重要原因就是部落格內容，有些生活類的部落格每天過的雞毛蒜皮，寫了也沒有意義，除非你發點自己的生活照，搞的像網路紅人一樣。平淡的事情不 值得關注，我們也不希望 生活。那我們的部落格每天或者週期性有更新，內容匱乏的時候怎麼辦呢，是不是有時候跟我一樣，在開啟部落格登陸後台準備寫部落格的時...
socket短時間內重連需注意的問題
socket短時間內重連需注意的問題 設定好監聽socket後，將socket的屬性設定為可重複使用位址，如 建立監聽socket socketlisten new socket addressfamily.internetwork,sockettype.stream,protocoltype.tc...