MySQL数据库中部分数据损坏恢复过程

注：此为记录我当时操作的全部过程d:\documents and settings\administrator>c:c:\>cd MySQLc:\mysql>cd datac:\mysql\data>cd hw_enterpricec:\mysql\data\hw_enterprice>myisamchk function_products.frm'myisamchk' 不是内部或外部命令，也不是可运行的程序或批处理文件。c:\mysql\data\hw_enterprice>cd\c:\>cd mysqlc:\mysql>cd bin注：查看myisamchk的帮助信息c:\mysql\bin>myisamchkmyisamchk  ver 2.6 for win95/win98 at i32by monty, for your professional usethis software comes with no warranty: see the public for details.description, check and repair of isam tables.used without options all tables on the command will be checked for errorsusage: myisamchk [options] tables[.myi]global options:  -#, --debug=...     output debug log. often this is 'd:t:o,filename'  -?, --help          display this help and exit.  -o, --set-variable var=option                      change the value of a variable. please note that                      this option is deprecated; you can set variables                      directly with '--variable-name=value'.  -t, --tmpdir=path   path for temporary files  -s, --silent        only print errors.  one can use two -s to make                      myisamchk very silent  -v, --verbose       print more information. this can be used with                      --description and --check. use many -v for more verbosity!  -v, --version       print version and exit.  -w, --wait          wait if table is locked.check options (check is the default action for myisamchk):  -c, --check         check table for errors  -e, --extend-check  check the table very throughly.  only use this in                      extreme cases as myisamchk should normally be able to                      find out if the table is ok even without this switch  -f, --fast          check only tables that haven't been closed properly  -c, --check-only-changed                      check only tables that have changed since last check  -f, --force         restart with '-r' if there are any errors in the table.                      states will be updated as with '--update-state'  -i, --information   print statistics information about table that is checked  -m, --medium-check  faster than extend-check, but only finds 99.99% of                      all errors.  should be good enough for most cases  -u  --update-state  mark tables as crashed if you find any errors  -t, --read-only     don't mark table as checkedrepair options (when using '-r' or '-o')  -b, --backup        make a backup of the .myd file as 'filename-time.bak'  --correct-checksum  correct checksum information for table.  -d, --data-file-length=#  max length of data file (when recreating data                      file when it's full)  -e, --extend-check  try to recover every possible row from the data file                      normally this will also find a lot of garbage rows;                      don't use this option if you are not totally desperate.  -f, --force         overwrite old temporary files.  -k, --keys-used=#   tell myisam to update only some specific keys. # is a                      bit mask of which keys to use. this can be used to                      get faster inserts!  -r, --recover       can fix almost anything except unique keys that aren't                      unique.  -n, --sort-recover  forces recovering with sorting even if the temporary                      file would be very big.  -p, --parallel-recover                      uses the same technique as '-r' and '-n', but creates                      all the keys in parallel, in different threads.                      this is alpha code. use at your own risk!  -o, --safe-recover  uses old recovery method; slower than '-r' but can                      handle a couple of cases where '-r' reports that it                      can't fix the data file.  --character-sets-dir=...                      directory where character sets are  --set-character-set=name                      change the character set used by the index  -q, --quick         faster repair by not modifying the data file.                      one can give a second '-q' to force myisamchk to                      modify the original datafile in case of duplicate keys  -u, --unpack        unpack file packed with myisampack.other actions:  -a, --analyze       analyze distribution of keys. will make some joins in                      MySQL faster.  you can check the calculated distribution                      by using '--description --verbose table_name'.  -d, --description   prints some information about table.  -a, --set-auto-increment[=value]                      force auto_increment to start at this or higher value                      if no value is given, then sets the next auto_increment                      value to the highest used value for the auto key + 1.  -s, --sort-index    sort index blocks.  this speeds up 'read-next' in                      applications  -r, --sort-records=#                      sort records according to an index.  this makes your                      data much more localized and may speed up thingsc:\mysql\bin>myisamchk c:\mysql\data\hw_enterprice\function_products.frmmyisamchk: error: 'c:\mysql\data\hw_enterprice\function_products.frm' is not a myisam-tablec:\mysql\bin>myisamchk c:\mysql\data\hw_enterprice\function_products.myichecking myisam file: c:\mysql\data\hw_enterprice\function_products.myidata records:   85207   deleted blocks:      39myisamchk: warning: table is marked as crashedmyisamchk: warning: 1 clients is using or hasn't closed the table properly- check file-size- check key delete-chain- check record delete-chainmyisamchk: error: record delete-link-chain corrupted- check index reference- check data record references index: 1- check data record references index: 2- check data record references index: 3- check record linksmyisamchk: error: wrong bytesec: 0-195-171 at linkstart: 841908myisam-table 'c:\MySQL\data\hw_enterprice\function_products.myi' is corruptedfix it using switch "-r" or "-o"

c:\MySQL\bin>myisamchk --recover --quick  c:\MySQL\data\hw_enterprice\function_products.myi- check key delete-chain- check record delete-chainmyisamchk: error: record delete-link-chain corruptedmyisamchk: error: quick-recover aborted; run recovery without switch 'q'updating myisam file: c:\MySQL\data\hw_enterprice\function_products.myimyisam-table 'c:\MySQL\data\hw_enterprice\function_products.myi' is not fixed because of errorstry fixing it by using the --safe-recover (-o) or the --force (-f) option

c:\MySQL\bin>myisamchk --safe-recover  c:\MySQL\data\hw_enterprice\function_products.myi- recovering (with keycache) myisam-table 'c:\MySQL\data\hw_enterprice\function_products.myi'data records: 85207wrong bytesec:   0-195-171 at     841908; skippeddata records: 85215

% myisamchk --recover --quick /path/to/tblname % myisamchk --recover /path/to/tblname % myisamchk --safe-recover /path/to/tblname