Oracle database files are mistakenly deleted how to recover

First, recover via file descriptor (descriptor) (RM delete data file not backed up)

Scene: misoperation Delete data file tp10.dbf

Rm-rf/u01/app/oracle/oradata/bxdb/tp10.dbf

Select Ts#,file#,name,bytes,status from V$datafile;

Ps-ef |grep dBW |grep-v grep

Cd/proc/12308/fd

1. Method One: Online recovery
Cp/proc/13979/fd/264/u01/app/oracle/oradata/ocp/newtp12.dbf
ALTER DATABASE datafile 7 offline;
Alter DATABASE rename file '/u01/app/oracle/oradata/oca/tp12.dbf ' to '/u01/app/oracle/oradata/ocp/newtp12.dbf ';
Recover DataFile 7;
ALTER DATABASE datafile online;

2. Method Two: Off-line recovery
Cp/proc/13979/fd/264/u01/app/oracle/oradata/ocp/newtp12.dbf
Shutdown immediate;
Shutdown abort;
Startup
Recover database;
ALTER DATABASE open;

Ii. Access to document number

1. Method One: bbed get file Number
Set filename '/proc/13979/fd/264 '
Set BlockSize 8192
Set filename '/proc/13979/fd/264 '
P KCVFH--a position in bbed
P KCVFH.KCVFHRFN--Display relative file number information (print)
Exit

2, method Two: Through the OD command file number information
9i file number offset is 280, plus the data file header of an operating system block 8192,od Skip 8472 to get the file number
Od-j 8472-t X1 262|head-1--16 output
Od-j 8472-t D2 262|head-1--Decimal output

The offset of the 10g/11g file number is 368, plus an operating system block on the header of the data file 8192,od skip 8560 to get the file number
Od-j 8560-t X1 264|head-1--16 output
Od-j 8560-t D2 264|head-1--Decimal output

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