NBU9.0版本恢复Oracle19C
开4通道恢复完成首批备份集：
不自动切换备份集恢复，RMAN无进度1小时后报错：
这套库3T左右，恢复小库200G的无任何问题。
NBU环境是华为云，网络端口已按照NBU文档开通：
经过朋友官方查到信息如下：
Below are tuning examples for several different platforms. Please check your O/S vendor documentation for details on these or equivalent parameters. The goals are three-fold:
- Send TCP Keepalives more frequently and detect loss of the remote endpoint within 15 minutes.
- Send TCP Keepalives successfully (within 15 minutes), before idle socket timeout (typically 60 or 30 minutes).
- Make sure TCP Keepalives retry at least as robustly as TCP data retransmission to prevent spurious connection drop. By default, Windows typically retransmits either 5 or 10 times and drops the connection within 10 to 150 seconds if no response. By default, UNIX/Linux typically retransmits 10 to 20 times over 8 to 20 minutes.
链接地址：
https://www.veritas.com/content/support/en_US/article.100028680
服务端修改参数如下：
tcp_keepalive_time = 700
tcp_keepalive_intvl = 10
tcp_keepalive_probes = 20
最后一切恢复正常。
小记一下，好记性不如烂笔头，嘿嘿！
来自 “ ITPUB博客 ” ，链接：https://blog.itpub.net/30327022/viewspace-2914553/ ，如需转载，请注明出处，否则将追究法律责任。
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