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這次客戶rm -rf /var/lib/mysql刪除文件,刪除一半及時終止,但是已經有很多mysql相關文件被刪除,重要的ibdata文件已經被刪除,並且客戶嘗試了大量的恢復工作,對該分區進行了大量的寫入操作,導致后面通過對xfs文件系統進行分析，確認無法恢復對應的ibdata文件.比較幸運客戶需要的核心的mysql庫都還在(frm和ibd文件還存在)
對於這種情況,可以參考以前類似的處理方法:[MySQL異常恢復]mysql ibd文件恢復
由於客戶無法提供創建表語句需要通過對frm進行解析獲取語句,利用mysqlfrm獲取表創建語句
E:\3>mysqlfrm --server=root:oracle@192.168.222.79:3306 --diagnostic T_XIFENFEI.frm
WARNING: Using a password on the
command
line interface can be insecure.
# Source on 192.168.222.79: ... connected.
# CAUTION: The diagnostic mode is a best-effort parse of the .frm file. As such, it may not identify all of
the components of the table correctly. This is especially
true
for
damaged files.
It will also not
read
the default values
for
the columns and the resulting statement may not be syntactically correct.
# Reading .frm file for EVALUATOR_T.frm:
# The .frm file is a TABLE.
# CREATE TABLE Statement:
CREATE TABLE `T_XIFENFEI` (
`ID` varchar(32) COLLATE `utf8_general_ci` DEFAULT NULL comment
'主鍵'
,
`BO_TYPE_DEFINE_ID` varchar(32) COLLATE `utf8_general_ci` DEFAULT NULL comment
'業務對象類型ID'
,
`MAIN_ID` varchar(32) COLLATE `utf8_general_ci` DEFAULT NULL comment
'業務對象主表記錄ID'
,
`PARENT_ID` varchar(32) COLLATE `utf8_general_ci` DEFAULT NULL comment
'父ID'
,
`ROW_NUM` decimal(32,0) DEFAULT NULL comment
'行號'
,
`VERSION` decimal(32,6) DEFAULT NULL comment
'版本'
,
`CREATE_DATE` datetime DEFAULT NULL comment
'創建時間'
,
`UPDATE_DATE` datetime DEFAULT NULL comment
'更新時間'
,
`BO_SOURCE_ROW_ID` varchar(32) COLLATE `utf8_general_ci` DEFAULT NULL comment
'來源明細行ID'
,
`EVALUATORS` text COLLATE `utf8_general_ci` DEFAULT NULL,
`IMPORTANCE` decimal(32,6) DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8, COMMENT
'評分人'
;
#...done.
|
對於有些獲取語句失敗,比如類似這樣錯誤
E:\TEMP\10000246_1108\db\ync2_fssc_2000003>mysqlfrm --server=root:oracle@192.168.222.79:3306 --diagnostic T_XFF.frm
Traceback (most recent call last):
File
"G:\ade\build\Python-2.7.6-windows-x86-64bit\lib\site-packages\cx_Freeze\initscripts\Console.py"
,
line 27,
in
<module>
File
"scripts\mysqlfrm.py"
, line 419,
in
<module>
File
".\mysql\utilities\command\read_frm.py"
, line 396,
in
read_frm_files_diagnostic
File
".\mysql\utilities\common\frm_reader.py"
, line 1538,
in
show_create_table_statement
File
".\mysql\utilities\common\frm_reader.py"
, line 1385,
in
_build_create_statement
File
".\mysql\utilities\common\frm_reader.py"
, line 1273,
in
_get_key_columns
IndexError: list index out of range
|
使用專門的工具對其進行解析
然后利用這些創建表語句在庫中創建表,並利用以下方法進行操作
mysql> alter table `t_xifenfei` discard tablespace;
Query OK, 0 rows affected (0.00 sec)
--上傳老的t_xifenfei.ibd文件,並修改所有者和屬組
mysql> alter table `t_xifenfei`
import
tablespace;
Query OK, 0 rows affected, 2 warnings (0.01 sec)
mysql>
select
count(1) from `t_xifenfei` ;
+----------+
| count(1) |
+----------+
| 78 |
+----------+
1 row
in
set
(0.00 sec)
|
使用類似的方法對於數據進行批量處理,然后使用mysqldump進行導出.在這個ibd的discard和import的過程中,有些異常情況這三種錯誤的處理
mysql> alter table T_LOG_XIFENFEI
import
tablespace;
ERROR 1808 (HY000): Schema mismatch (Table has ROW_TYPE_DYNAMIC row
format
, .ibd
file
has ROW_TYPE_COMPACT row
format
.)
mysql> alter table `T_LOG_XIFENFEI`
import
tablespace;
ERROR 1817 (HY000): Index corrupt: Externally stored column(4) has a reference length of 4
in
the cluster index PRIMARY
mysql> alter table `T_LOG_XIFENFEI`
import
tablespace;
ERROR 1815 (HY000): Internal error: Cannot reset LSNs
in
table `XFF`.`T_LOG_XIFENFEI` : Data structure corruption
|
Schema mismatch (Table has ROW_TYPE_DYNAMIC row format, .ibd file has ROW_TYPE_COMPACT row format.) 這種錯誤是由於row_format設置不正確導致,重新創建表使用正確的row_format然后執行discard和import操作.
Index corrupt: Externally stored column(4) has a reference length of 4 in the cluster index PRIMARY 這種錯誤是由於表的創建語句和ibd中記錄數據不匹配,主要是由於創建表語句不完全正確導致,重新獲取正確語句進行恢復
Internal error: Cannot reset LSNs in table `XFF`.`T_LOG_XIFENFEI` : Data structure corruption 這種錯誤是由於ibd文件本身不一致無法使用該方法恢復,對於這類情況使用我們專業的工具進行處理