SQL> alter database mount
2 ;

数据库已更改。
只有mount后才能获取
SQL> select dbid from v$database;

  DBID

1779551310
SQL> col name format a20
SQL> select name,dbid from v$containers;

NAME DBID

CDB$ROOT 1779551310
PDB$SEED 603865257
PDBTEST 3394996704
CLONEPDB_PLUG 50957894
SQL> select name,dbid from v$pdbs;

NAME DBID

PDB$SEED 603865257
PDBTEST 3394996704
CLONEPDB_PLUG 50957894
或
C:\app\Administrator\virtual\product\12.2.0\dbhome_2\bin>rman target / nocatalog

恢复管理器: Release 12.2.0.1.0 - Production on 星期五 1月 5 09:20:17 2018

Copyright (c) 1982, 2017, Oracle and/or its affiliates. All rights reserved.

已连接到目标数据库: NEWTEST (DBID=1779551310, 未打开)
使用目标数据库控制文件替代恢复目录
nomount状态
SQL> startup nomount;
ORACLE 例程已经启动。

Total System Global Area 2768240640 bytes
Fixed Size 8922760 bytes
Variable Size 704645496 bytes
Database Buffers 2046820352 bytes
Redo Buffers 7852032 bytes
SQL> alter system dump datafile 'C:\app\Administrator\virtual\oradata\newtest\sy
saux01.dbf' block 1;

系统已更改。

SQL> oradebug setmypid;
已处理的语句
SQL> oradebug tracefile_name;
C:\APP\ADMINISTRATOR\VIRTUAL\diag\rdbms\newtest\newtest\trace\newtest_ora_26588.trc