datagard 可以只開啟1521埠麼？
Primary database IP: 192.168.0.11
主庫：目前的狀態是我們沒有關閉任何埠，
沒有切換的時候，我們沒有發現備庫連線主庫的動作。但是備庫有主庫連線的動作，表明主庫LNS時刻準備著把REDO LOG傳輸給 備庫。
[root@mycos-p ~]# netstat -n
Active Internet connections (w/o servers)
Proto Recv-Q Send-Q Local Address Foreign Address State
tcp 0 0 127.0.0.1:63270 127.0.0.1:1521 TIME_WAIT
tcp 0 0 127.0.0.1:63577 127.0.0.1:1521 TIME_WAIT
tcp 0 0 127.0.0.1:1521 127.0.0.1:13838 ESTABLISHED
tcp 0 0 127.0.0.1:1521 127.0.0.1:13840 ESTABLISHED
tcp 0 0 127.0.0.1:61296 127.0.0.1:1521 TIME_WAIT
tcp 0 0 127.0.0.1:57266 127.0.0.1:1521 TIME_WAIT
tcp 0 0 127.0.0.1:46582 127.0.0.1:1521 TIME_WAIT
tcp 0 0 127.0.0.1:3938 127.0.0.1:23364 TIME_WAIT
tcp 0 0 127.0.0.1:48428 127.0.0.1:1521 TIME_WAIT
tcp 0 0 127.0.0.1:42323 127.0.0.1:1521 TIME_WAIT
tcp 0 0 127.0.0.1:54262 127.0.0.1:1158 TIME_WAIT
tcp 0 0 192.168.0.11:22 192.168.0.1:1616 ESTABLISHED
tcp 0 0 127.0.0.1:37173 127.0.0.1:1521 TIME_WAIT
tcp 0 0 127.0.0.1:40226 127.0.0.1:1521 TIME_WAIT
tcp 0 0 127.0.0.1:30024 127.0.0.1:1521 TIME_WAIT
tcp 0 0 127.0.0.1:19767 127.0.0.1:1521 TIME_WAIT
tcp 0 0 127.0.0.1:13815 127.0.0.1:1521 ESTABLISHED
tcp 0 0 192.168.0.11:22 192.168.0.1:4558 ESTABLISHED
tcp 0 0 192.168.0.11:22 192.168.0.1:4303 ESTABLISHED
tcp 0 0 127.0.0.1:13838 127.0.0.1:1521 ESTABLISHED
tcp 0 0 127.0.0.1:13840 127.0.0.1:1521 ESTABLISHED
tcp 0 0 192.168.0.11:22 192.168.0.1:1730 ESTABLISHED
tcp 0 0 127.0.0.1:1521 127.0.0.1:13815 ESTABLISHED
tcp 0 0 127.0.0.1:1521 127.0.0.1:46579 TIME_WAIT
tcp 0 0 127.0.0.1:1521 127.0.0.1:46578 TIME_WAIT
standby database IP:192.168.0.12
[root@mycos-s ~]# netstat -n
Active Internet connections (w/o servers)
Proto Recv-Q Send-Q Local Address Foreign Address State
tcp 0 0 127.0.0.1:48730 127.0.0.1:1521 ESTABLISHED
tcp 0 0 127.0.0.1:48750 127.0.0.1:1521 ESTABLISHED
tcp 0 0 127.0.0.1:48748 127.0.0.1:1521 ESTABLISHED
tcp 0 0 127.0.0.1:48749 127.0.0.1:1521 ESTABLISHED
tcp 0 0 192.168.0.12:22 192.168.0.1:1623 ESTABLISHED
tcp 0 0 127.0.0.1:1521 127.0.0.1:48730 ESTABLISHED
tcp 0 0 127.0.0.1:1521 127.0.0.1:45153 TIME_WAIT
tcp 0 0 127.0.0.1:1521 127.0.0.1:48749 ESTABLISHED
tcp 0 0 127.0.0.1:1521 127.0.0.1:48748 ESTABLISHED
tcp 0 0 127.0.0.1:1521 127.0.0.1:48750 ESTABLISHED
tcp 0 0 127.0.0.1:34507 127.0.0.1:1521 ESTABLISHED
tcp 0 0 127.0.0.1:34508 127.0.0.1:1521 ESTABLISHED
tcp 0 0 127.0.0.1:25059 127.0.0.1:1521 ESTABLISHED
tcp 0 0 192.168.0.12:1521 192.168.0.11:35491 ESTABLISHED
tcp 0 0 127.0.0.1:3938 127.0.0.1:46526 TIME_WAIT
tcp 0 0 192.168.0.12:22 192.168.0.1:4559 ESTABLISHED
tcp 0 0 127.0.0.1:1521 127.0.0.1:34508 ESTABLISHED
tcp 0 0 127.0.0.1:1521 127.0.0.1:34507 ESTABLISHED
tcp 0 0 192.168.0.12:22 192.168.0.1:1731 ESTABLISHED
tcp 0 0 127.0.0.1:1521 127.0.0.1:25059 ESTABLISHED
主庫在切換日誌瞬間
我們切換的瞬間有了備庫連線主庫動作，為什麼呢？因為要去主庫檢測API
[root@mycos-p ~]# netstat -n
Active Internet connections (w/o servers)
Proto Recv-Q Send-Q Local Address Foreign Address State
tcp 0 0 127.0.0.1:1521 127.0.0.1:13838 ESTABLISHED
tcp 0 0 127.0.0.1:1521 127.0.0.1:13840 ESTABLISHED
tcp 0 0 127.0.0.1:3938 127.0.0.1:9753 TIME_WAIT
tcp 0 0 127.0.0.1:60859 127.0.0.1:1521 TIME_WAIT
tcp 0 0 127.0.0.1:54801 127.0.0.1:1521 TIME_WAIT
tcp 0 0 127.0.0.1:56083 127.0.0.1:1521 TIME_WAIT
tcp 0 0 127.0.0.1:1521 127.0.0.1:33617 TIME_WAIT
tcp 0 0 192.168.0.11:22 192.168.0.1:1616 ESTABLISHED
tcp 0 0 127.0.0.1:40934 127.0.0.1:1521 TIME_WAIT
tcp 0 0 192.168.0.11:35491 192.168.0.12:1521 ESTABLISHED
tcp 0 0 127.0.0.1:1521 127.0.0.1:26525 TIME_WAIT
tcp 0 0 127.0.0.1:6528 127.0.0.1:1158 TIME_WAIT
tcp 0 0 127.0.0.1:13815 127.0.0.1:1521 ESTABLISHED
tcp 0 0 192.168.0.11:22 192.168.0.1:4558 ESTABLISHED
tcp 0 0 192.168.0.11:22 192.168.0.1:4303 ESTABLISHED
tcp 0 0 127.0.0.1:13838 127.0.0.1:1521 ESTABLISHED
tcp 0 0 127.0.0.1:13840 127.0.0.1:1521 ESTABLISHED
tcp 0 0 192.168.0.11:22 192.168.0.1:1730 ESTABLISHED
tcp 0 0 127.0.0.1:10308 127.0.0.1:1521 TIME_WAIT
tcp 0 0 127.0.0.1:1521 127.0.0.1:52713 TIME_WAIT
tcp 0 0 127.0.0.1:1521 127.0.0.1:13815 ESTABLISHED
tcp 0 0 127.0.0.1:1521 127.0.0.1:19195 TIME_WAIT
主庫在切換日誌瞬間
備庫埠情況
[root@mycos-s ~]# netstat -n
Active Internet connections (w/o servers)
Proto Recv-Q Send-Q Local Address Foreign Address State
tcp 0 0 127.0.0.1:46786 127.0.0.1:1158 TIME_WAIT
tcp 0 0 127.0.0.1:48730 127.0.0.1:1521 ESTABLISHED
tcp 0 0 127.0.0.1:48750 127.0.0.1:1521 ESTABLISHED
tcp 0 0 127.0.0.1:48748 127.0.0.1:1521 ESTABLISHED
tcp 0 0 127.0.0.1:48749 127.0.0.1:1521 ESTABLISHED
tcp 0 0 192.168.0.12:22 192.168.0.1:1623 ESTABLISHED
tcp 0 0 127.0.0.1:1521 127.0.0.1:48730 ESTABLISHED
tcp 0 0 127.0.0.1:1521 127.0.0.1:48749 ESTABLISHED
tcp 0 0 127.0.0.1:1521 127.0.0.1:48748 ESTABLISHED
tcp 0 0 127.0.0.1:1521 127.0.0.1:48750 ESTABLISHED
tcp 0 0 127.0.0.1:34507 127.0.0.1:1521 ESTABLISHED
tcp 0 0 127.0.0.1:34508 127.0.0.1:1521 ESTABLISHED
tcp 0 0 127.0.0.1:25059 127.0.0.1:1521 ESTABLISHED
tcp 0 0 192.168.0.12:1521 192.168.0.11:35491 ESTABLISHED
tcp 0 0 192.168.0.12:22 192.168.0.1:4559 ESTABLISHED
tcp 0 0 127.0.0.1:1521 127.0.0.1:34508 ESTABLISHED
tcp 0 0 127.0.0.1:1521 127.0.0.1:34507 ESTABLISHED
tcp 0 0 192.168.0.12:22 192.168.0.1:1731 ESTABLISHED
tcp 0 0 127.0.0.1:1521 127.0.0.1:25059 ESTABLISHED
tcp 0 0 192.168.0.12:1521 192.168.0.16:25320 ESTABLISHED
埠總結：首先 主庫，備庫 必須開啟1521 埠，通訊。 同時 主庫又開啟了35491埠。現在測試一下這個埠是不是，不變化的呢。 我們重啟主庫。
看下我們重啟之後的狀態：很明顯 主庫，備庫開啟了 1521埠外，又開啟了 13445,13444 這2個埠。
[root@mycos-p ~]# netstat -n
Active Internet connections (w/o servers)
Proto Recv-Q Send-Q Local Address Foreign Address State
tcp 0 0 127.0.0.1:35794 127.0.0.1:1158 TIME_WAIT
tcp 0 0 127.0.0.1:1521 127.0.0.1:14623 TIME_WAIT
tcp 0 0 127.0.0.1:1521 127.0.0.1:45362 TIME_WAIT
tcp 0 0 192.168.0.11:22 192.168.0.1:1616 ESTABLISHED
tcp 0 0 127.0.0.1:1521 127.0.0.1:16223 TIME_WAIT
tcp 0 0 127.0.0.1:1521 127.0.0.1:25189 TIME_WAIT
tcp 0 0 127.0.0.1:1521 127.0.0.1:24678 TIME_WAIT
tcp 0 0 127.0.0.1:38595 127.0.0.1:1521 TIME_WAIT
tcp 0 0 127.0.0.1:38598 127.0.0.1:1521 ESTABLISHED
tcp 0 0 127.0.0.1:38596 127.0.0.1:1521 TIME_WAIT
tcp 0 0 127.0.0.1:38597 127.0.0.1:1521 TIME_WAIT
tcp 0 0 127.0.0.1:38606 127.0.0.1:1521 TIME_WAIT
tcp 0 0 127.0.0.1:38607 127.0.0.1:1521 TIME_WAIT
tcp 0 0 127.0.0.1:38604 127.0.0.1:1521 TIME_WAIT
tcp 0 0 127.0.0.1:38605 127.0.0.1:1521 TIME_WAIT
tcp 0 0 127.0.0.1:38610 127.0.0.1:1521 TIME_WAIT
tcp 0 0 127.0.0.1:38611 127.0.0.1:1521 TIME_WAIT
tcp 0 0 127.0.0.1:38608 127.0.0.1:1521 TIME_WAIT
tcp 0 0 127.0.0.1:38609 127.0.0.1:1521 TIME_WAIT
tcp 0 0 127.0.0.1:38614 127.0.0.1:1521 ESTABLISHED
tcp 0 0 127.0.0.1:38618 127.0.0.1:1521 ESTABLISHED
tcp 0 0 127.0.0.1:3938 127.0.0.1:43906 TIME_WAIT
tcp 0 0 127.0.0.1:1521 127.0.0.1:3749 TIME_WAIT
tcp 0 0 127.0.0.1:1521 127.0.0.1:19627 TIME_WAIT
tcp 0 0 192.168.0.11:13445 192.168.0.12:1521 ESTABLISHED
tcp 0 0 192.168.0.11:13444 192.168.0.12:1521 ESTABLISHED
tcp 0 0 127.0.0.1:1521 127.0.0.1:38598 ESTABLISHED
tcp 0 0 127.0.0.1:1521 127.0.0.1:38593 TIME_WAIT
tcp 0 0 192.168.0.11:22 192.168.0.1:4303 ESTABLISHED
tcp 0 0 127.0.0.1:1521 127.0.0.1:38594 TIME_WAIT
tcp 0 0 192.168.0.11:22 192.168.0.1:1730 ESTABLISHED
tcp 0 0 127.0.0.1:1521 127.0.0.1:38603 TIME_WAIT
tcp 0 0 127.0.0.1:1521 127.0.0.1:38602 TIME_WAIT
tcp 0 0 127.0.0.1:1521 127.0.0.1:38614 ESTABLISHED
tcp 0 0 127.0.0.1:1521 127.0.0.1:58322 TIME_WAIT
tcp 0 0 127.0.0.1:1521 127.0.0.1:38619 TIME_WAIT
tcp 0 0 127.0.0.1:1521 127.0.0.1:38618 ESTABLISHED
tcp 0 0 127.0.0.1:1521 127.0.0.1:4835 TIME_WAIT
[root@mycos-s ~]# netstat -n
Active Internet connections (w/o servers)
Proto Recv-Q Send-Q Local Address Foreign Address State
tcp 0 0 127.0.0.1:48730 127.0.0.1:1521 ESTABLISHED
tcp 0 0 127.0.0.1:48750 127.0.0.1:1521 ESTABLISHED
tcp 0 0 127.0.0.1:48748 127.0.0.1:1521 ESTABLISHED
tcp 0 0 127.0.0.1:48749 127.0.0.1:1521 ESTABLISHED
tcp 0 0 192.168.0.12:22 192.168.0.1:1623 ESTABLISHED
tcp 0 0 127.0.0.1:1521 127.0.0.1:48730 ESTABLISHED
tcp 0 0 127.0.0.1:1521 127.0.0.1:48749 ESTABLISHED
tcp 0 0 127.0.0.1:1521 127.0.0.1:48748 ESTABLISHED
tcp 0 0 127.0.0.1:1521 127.0.0.1:48750 ESTABLISHED
tcp 0 0 127.0.0.1:34507 127.0.0.1:1521 ESTABLISHED
tcp 0 0 127.0.0.1:34508 127.0.0.1:1521 ESTABLISHED
tcp 0 0 192.168.0.12:1521 192.168.0.11:13444 ESTABLISHED
tcp 0 0 192.168.0.12:1521 192.168.0.11:13445 ESTABLISHED
tcp 0 0 127.0.0.1:25059 127.0.0.1:1521 ESTABLISHED
tcp 0 0 127.0.0.1:1521 127.0.0.1:34508 ESTABLISHED
tcp 0 0 127.0.0.1:1521 127.0.0.1:34507 ESTABLISHED
tcp 0 132 192.168.0.12:22 192.168.0.1:1731 ESTABLISHED
tcp 0 0 127.0.0.1:1521 127.0.0.1:25059 ESTABLISHED
tcp 0 0 192.168.0.12:1521 192.168.0.16:25320 ESTABLISHED
tcp 0 0 127.0.0.1:3938 127.0.0.1:4350 TIME_WAIT
總結：通過我們對埠的追蹤，可以發現如果我們主庫，備庫只開1521埠是遠遠不夠的，而且主庫會隨機的開啟埠，所以只開啟1521埠，是不能保持DG通訊的。我們這裡只是簡單的測試了一下重新主庫，就開啟了1521埠以外的埠。所以如果是業務DG 還是開啟所有埠比較好，安全層次的去上層做吧，不要在伺服器埠這裡想辦法了，至少我們DG開啟1521埠是不合適的。
來自 “ ITPUB部落格 ” ，連結：http://blog.itpub.net/26442936/viewspace-729888/，如需轉載，請註明出處，否則將追究法律責任。
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