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标签归档:rm mysql
又一起mysql rm删除数据库目录事故
有mysql用户直接使用rm命令删除了所在数据库目录文件夹(删除途中发现删除错误,直接强制终止使得部分删除,部分文件得以保留),如果数据库没有crash,这个问题不大,可以直接通过句柄进行恢复出来对应的ibd文件,然后进行一些特殊处理,数据理论上不会有丢失,参见:mysql 数据库目录被删除恢复.对于这次的情况,只能通过文件系统级别进行恢复,不过该数据库表比较多,大概删除了几千个文件,而且文件系统是ext4,导致大量文件目录被置空,而且该库还运行了一段时间
看来文件恢复删除这条路,基本上很难走得通,可以通过底层碎片技术恢复,通过底层扫描,找到不少碎片
由于涉及的库表多,一个个处理太费时间,通过批量脚本直接解析扫描出来的碎片,并且对其进行入库处理
DBLOGIN=”-uroot ”
DICT_DBNAME=test
RECOVER_DBNAME=xifenfei
WORK_PATH=”/nfs_share/mysql-xff”
cd $WORK_PATH
>/tmp/recover_table_list.$RECOVER_DBNAME
>/tmp/recover_table_parser.$RECOVER_DBNAME
>/tmp/recover_table_unload.$RECOVER_DBNAME
rm -rf /tmp/recover_table_unload_$RECOVER_DBNAME.tmp
echo “tee /tmp/recover_table_unload_$RECOVER_DBNAME.tmp” >/tmp/recover_table_unload.$RECOVER_DBNAME
echo “SET @enable_trigger = 0;”>>/tmp/recover_table_unload.$RECOVER_DBNAME
echo “SET FOREIGN_KEY_CHECKS=0;” >>/tmp/recover_table_unload.$RECOVER_DBNAME
for TABLE_NAME_ID in `mysql $DBLOGIN $DICT_DBNAME -NBe “SELECT SYS_TABLES.NAME FROM SYS_TABLES LEFT JOIN SYS_INDEXES ON SYS_TABLES.ID = SYS_INDEXES.TABLE_ID WHERE SYS_INDEXES.NAME IN (‘PRIMARY’, ‘GENERAL_CLUSTERED_INDEX’) AND SYS_TABLES.NAME LIKE ‘${RECOVER_DBNAME}/%’”`
do
PKEY=`mysql $DBLOGIN $DICT_DBNAME -NBe “SELECT SYS_INDEXES.ID FROM SYS_TABLES LEFT JOIN SYS_INDEXES ON SYS_TABLES.ID = SYS_INDEXES.TABLE_ID WHERE SYS_INDEXES.NAME IN (‘PRIMARY’, ‘GENERAL_CLUSTERED_INDEX’) AND SYS_TABLES.NAME=’$TABLE_NAME_ID’”`
echo $TABLE_NAME_ID’,’$PKEY >>/tmp/recover_table_list.$RECOVER_DBNAME
TABLE_NAME=$(echo `echo $TABLE_NAME_ID`|awk -F”/” ‘{print $2}’ )
#echo $TABLE_NAME
PAGE=”pages-ibdata1/FIL_PAGE_INDEX/`printf ‘%016u’ ${PKEY}`.page”
echo “./c_parser -5f $PAGE -b pages-ibdata1/FIL_PAGE_TYPE_BLOB -t dictionary/$TABLE_NAME.sql > dumps/default/$TABLE_NAME 2> dumps/default/$TABLE_NAME.sql” >>/tmp/recover_table_parser.$RECOVER_DBNAME
echo “source dumps/default/$TABLE_NAME.sql” >>/tmp/recover_table_unload.$RECOVER_DBNAME
echo “select ‘$TABLE_NAME.sql……done’;”>>/tmp/recover_table_unload.$RECOVER_DBNAME
done
echo /tmp/recover_table_parser.$RECOVER_DBNAME
echo /tmp/recover_table_unload.$RECOVER_DBNAME
恢复之后数据整体入库,查询部分没有覆盖表,效果尚可,最大限度抢救了数据