问题
We (apparently) had poorly executed of our Solaris MySQL database engine last night. At least some of the InnoDB tables are corrupted, with timestamp out of order errors in the transaction log, and a specific error about the index being corrupted.
We know about the tools available for MyISAM table repairs, but cannot find anything for InnoDB.
Side note: attempting a table optimize (in my attempt to rebuild the corrupted index) causes the database server to crash.
回答1:
First of all stop the server and image the disc. There's no point only having one shot at this. Then take a look here.
回答2:
stop your application...or stop your slave so no new rows are being added
create table <new table> like <old table>;
insert <new table> select * from <old table>;
truncate table <old table>;
insert <old table> select * from <new table>;
restart your server or slave
回答3:
The following solution was inspired by Sandro's tip above.
Warning: while it worked for me, but I cannot tell if it will work for you.
My problem was the following: reading some specific rows from a table (let's call this table broken
) would crash MySQL. Even SELECT COUNT(*) FROM broken
would kill it. I hope you have a PRIMARY KEY
on this table (in the following sample, it's id
).
- Make sure you have a backup or snapshot of the broken MySQL server (just in case you want to go back to step 1 and try something else!)
CREATE TABLE broken_repair LIKE broken;
INSERT broken_repair SELECT * FROM broken WHERE id NOT IN (SELECT id FROM broken_repair) LIMIT 1;
- Repeat step 3 until it crashes the DB (you can use
LIMIT 100000
and then use lower values, until usingLIMIT 1
crashes the DB). - See if you have everything (you can compare
SELECT MAX(id) FROM broken
with the number of rows inbroken_repair
). - At this point, I apparently had all my rows (except those which were probably savagely truncated by InnoDB). If you miss some rows, you could try adding an
OFFSET
to theLIMIT
.
Good luck!
回答4:
Here is the solution provided by MySQL: http://dev.mysql.com/doc/refman/5.5/en/forcing-innodb-recovery.html
回答5:
See this article: http://www.unilogica.com/mysql-innodb-recovery/ (It's in portuguese)
Are explained how to use innodb_force_recovery and innodb_file_per_table. I discovered this after need to recovery a crashed database with a single ibdata1.
Using innodb_file_per_table, all tables in InnoDB will create a separated table file, like MyISAM.
回答6:
Note: If your issue is, "innodb index is marked as corrupted"! Then, the simple solution can be, just remove the indexes and add them again. That can solve pretty quickly without losing any records nor restarting or moving table contents into a temporary table and back.
回答7:
Step 1.
Stop MySQL server
Step 2.
add this line to my.cnf ( In windows it is called my.ini )
set-variable=innodb_force_recovery=6
Step 3.
delete ib_logfile0 and ib_logfile1
Step 4.
Start MySQL server
Step 5.
Run this command:
mysqlcheck --database db_name table_name -uroot -p
After you have successfully fixed the crashed innodb table, don't forget to remove #set-variable=innodb_force_recovery=6 from my.cnf and then restart MySQL server again.
来源:https://stackoverflow.com/questions/226172/how-do-i-repair-an-innodb-table