In the case of what backup, the data file was deleted for recovery
Some of the restrictive conditions
1. Data blocks that need to be recovered should not be used
2. The file system itself has not been corrupted
Using the tool ext3grep,http://code.google.com/p/ext3grep/
Installation
./configure
Make
Make install
Mount
Ls-id file system directory where data files are stored--view Inode
Umount file system directory where data files are stored
EXT3GREP/DEV/SDB1--ls--inode 2
EXT3GREP/DEV/SDB1--ls--inode 3
EXT3GREP/DEV/SDB1--ls--inode 4
EXT3GREP/DEV/SDB1--restore-inode 2--run to an empty directory
mv./RESTORED_FILES/INODE.2 T3. MYI
EXT3GREP/DEV/SDB1--restore-inode 3
mv./restored_files/inode.3 T3. MYD
EXT3GREP/DEV/SDB1--restore-inode 4
mv./restored_files/inode.4 T3.frm
CP t3*/HOME/MYSQL/DB1
Chown Mysql:mysql t3*
Extundelete tools like Ext3grep can restore EXT4 type
EXTUNDELETE/DEV/SDB1--inode 2
EXTUNDELETE/DEV/SDB1--restore-inode 2
MySQL data file Delete, OS level recovery file
