备份不可用时，重建数据文件

	1. 操作前提
		a. 数据文件创建之后的所有归档日志都可以用
		b. 控制文件包含损坏的数据文件的名称
		c. 没有相应的数据文件备份
	2. 操作步骤
		a. 删除数据文件模拟丢失
		[oracle@oracle19c O19C]$ rm -rf aw01.dbf
		b. 关闭数据库
		SQL> shutdown abort;
		c. 还原数据文件
		SQL> startup;
		ORACLE instance started.
		
		Total System Global Area 2432695144 bytes
		Fixed Size		    8899432 bytes
		Variable Size		  536870912 bytes
		Database Buffers	 1879048192 bytes
		Redo Buffers		    7876608 bytes
		Database mounted.
		ORA-01157: cannot identify/lock data file 5 - see DBWR trace file
		ORA-01110: data file 5: '/opt/oracle/oradata/O19C/aw01.dbf'
		
		
		SQL>  alter database create datafile '/opt/oracle/oradata/O19C/aw01.dbf';
		SQL> recover datafile '/opt/oracle/oradata/O19C/aw01.dbf'
		ORA-00279: change 2251398 generated at 09/12/2024 10:19:33 needed for thread 1
		ORA-00289: suggestion : /opt/oracle/product/19c/dbhome_1/dbs/arch1_1_1179483047.dbf
		ORA-00280: change 2251398 for thread 1 is in sequence #1
		
		
		Specify log: {<RET>=suggested | filename | AUTO | CANCEL}
		auto
		ORA-00279: change 2351431 generated at 09/12/2024 10:21:49 needed for thread 1
		ORA-00289: suggestion : /opt/oracle/product/19c/dbhome_1/dbs/arch1_2_1179483047.dbf
		ORA-00280: change 2351431 for thread 1 is in sequence #2
		Log applied.
		Media recovery complete.
		SQL> alter database open;