生产环境的数据表修改乱了，需要从备份中还原，将备份文件拷贝到测试机上，使用HANA Studio执行还原租户库。
一会儿回来，看到进度条都已经完成，颇感欣慰，关闭窗口用HANA Studio连接数据库，可是就是连接不上，连接SYSTEM库没有问题。
xshell登录HANA数据库服务器的操作系统
s4padm@ip:/hana/hanabackup> hdbsql -i 0 -u SYSTEM -p password  -d SYSTEMDB
Welcome to the SAP HANA Database interactive terminal.
                          
Type:  \h for help with commands          
       \q to quit                         
hdbsql SYSTEMDB=> select * from m_databases    --看看租户库的状态
hdbsql SYSTEMDB=> alter system start database S4P  -启动租户库
* 2: general error: Database could not be started;startDatabase() failed: previous recovery incomplete: volume: 3:2 is in state: RecoveryError volume: 3:3 is in state: RecoveryError volume: 3:4 is in state: RecoveryError volume: 3:5 is in state: RecoveryError SQLSTATE: HY000
提示还原的数据不完全。

好像看不出具体原因。进入操作系统查看日志：
s4padm@ip:/usr/sap/S4P/HDB00/ip*/trace> more nameserver_alert_ip*.trc
[10064]{100158}[26/-1] 2021-04-24 11:29:51.108159 e NameServer       TREXNameServer.cpp(09081) : TREXNameServer::startDatabase: 3 failed : previous recovery incomplete: volum
e: 3:2 is in state: RecoveryError volume: 3:3 is in state: RecoveryError volume: 3:4 is in state: RecoveryError volume: 3:5 is in state: RecoveryError[10064]{100158}[26/-1] 2021-04-24 11:29:51.108170 e tns_ddl          TNSClient.cpp(00956) : start database '3' failed:Database could not be started;startDatabase() failed: previous recovery incomplete: volume: 3:2 is in state: RecoveryError volume: 3:3 is in state: RecoveryError volume: 3:4 is in state: RecoveryError volume: 3:5 is in state: Reco
veryError(5709)

还是提示错误，看来还是还原不成功导致的，那就重新还原一次，这次还原后成功了。
DATABASE_NAME,DESCRIPTION,ACTIVE_STATUS,ACTIVE_STATUS_DETAILS,OS_USER,OS_GROUP,RESTART_MODE,FALLBACK_SNAPSHOT_CREATE_TIME
"SYSTEMDB","SystemDB-S4P-00","YES","","","","DEFAULT",?
"S4P","","YES","","","","DEFAULT",?

在次还原也发现第一次失败的原因了，原来还原那个进度条不代表完成，要等还原完成的提示窗口蹦出来才是。其实我第一次关闭了窗口就算是终止了还原操作。