[英]Corrupt MySQL Database, Only Accessible With innodb_force_recovery=6
MySQL 5.7 on Ubuntu 16.04 LTS Ubuntu 16.04 LTS上的MySQL 5.7
Database was corrupted after what I assume was an improper system shutdown, having the worst time trying to recover it. 在我认为是不正确的系统关闭之后,数据库已损坏,尝试恢复数据库的时间最差。 Previous system admin had no recent backups, somewhat necessary that I try everything I can to repair/recover the database.
以前的系统管理员最近没有备份,因此我必须尽一切努力修复/恢复数据库。
MySQL server only runs with: innodb_force_recovery=6
MySQL服务器仅在以下情况下运行:
innodb_force_recovery=6
mysqldump gives this error: mysqldump给出了这个错误:
Couldn't execute 'SHOW VARIABLES LIKE 'gtid_mode'': Table 'performance_schema.session_variables' doesn't exist (1146)
无法执行类似于“ gtid_mode”的“ SHOW VARIABLES”:表“ performance_schema.session_variables”不存在(1146)
Can't run mysql_upgrade
with innodb_force_recovery=6
无法使用
innodb_force_recovery=6
运行mysql_upgrade
If you have any relevant questions, please ask. 如果您有任何相关问题,请询问。
At this point the only option is to extract data and re-create InnoDB database from the dump. 此时,唯一的选择是从转储中提取数据并重新创建InnoDB数据库。
Quite often MySQL crashes when it hits a corruption in any of pages, so it's better to dump tables one by one. 当MySQL在任何页面中遇到损坏时,通常会崩溃,因此最好逐个转储表。
Here's a script to dump tables individually that you can tweak for your specific case. 这是一个单独转储表的脚本,您可以针对特定情况进行调整。 It will restart MySQL if it crashes, and save a list of "bad" tables in
failed.txt
. 如果崩溃,它将重新启动MySQL,并将“坏”表的列表保存在
failed.txt
。
set -eux
edir=export
function ensure_mysqld() {
mysql -e 'select 1' && return
service mysql start
timeout=300
while [[ $timeout -gt 0 ]]
do
mysql -e 'select 1' && return
sleep 1
timeout=$(( $timeout - 1 ))
done
echo "failed to start MySQL"
exit 1
}
for d in $(cat databases)
do
mkdir -p $edir/$d
set +e
ensure_mysqld
set -e
for t in $(mysql -S $socket -NBe "select TABLE_NAME from information_schema.TABLES WHERE TABLE_SCHEMA='$d' AND ENGINE = 'InnoDB' AND TABLE_TYPE = 'BASE TABLE'")
do
ensure_mysqld
mysqldump --skip-lock-tables $d $t > $edir/$d/$t.sql || echo "$d.$t" >> failed.txt
done
done
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