A few years ago Yves Trudeau and Aleksandr Kuzminsky wrote posts about different ways for recovering orphaned .ibd files:
Today I want to show you how to do that in a more easy and quick way. In my example, I’ll restore a “payment.ibd” file (payment table) from Sakila DB on a server with MySQL 5.5 (but with help from MySQL 5.6 and sandbox).
In my case the OS is CentOS. So I needed to:
install mysqlsandbox(check instructions there)
download latest Percona Server 5.6:
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wget https://www.percona.com/redir/downloads/Percona-Server-5.6/LATEST/release-5.6.14-62.0/483/binary/linux/i686/Percona-Server-5.6.14-rel62.0-483.Linux.i686.tar.gz |
create sandbox
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make_sandbox Percona-Server-5.6.14-rel62.0-483.Linux.i686.tar.gz |
test it
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mysql -umsandbox -pmsandbox --host=127.0.0.1 --port=5614 -e "select @@versionG"<br>*************************** 1. row ***************************<br>@@version: 5.6.14-rel62.0 |
It Works!
check datadir and if the innodb_file_per_table option enabled (this is a requirement)
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mysql -umsandbox -pmsandbox --host=127.0.0.1 --port=5614 -e "show variables like 'datadir'"<br>+---------------+---------------------------------------+<br>| Variable_name | Value |<br>+---------------+---------------------------------------+<br>| datadir | /home/mixa/sandboxes/msb_5_6_14/data/ |<br>+---------------+---------------------------------------+ |
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mysql -umsandbox -pmsandbox --host=127.0.0.1 --port=5614 -e "show variables like '%per_table'"<br>+-----------------------+-------+<br>| Variable_name | Value |<br>+-----------------------+-------+<br>| innodb_file_per_table | ON |<br>+-----------------------+-------+ |
If it’s not enabled then you’ll need to enable it
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mysql -umsandbox -pmsandbox --host=127.0.0.1 --port=5614 -e "SET GLOBAL innodb_file_per_table=1" |
create empty payment table on 5.6 sandbox
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mysql -umsandbox -pmsandbox --host=127.0.0.1 --port=5614 test < payment_table.sql |
payment_table.sql – is file with “SHOW CREATE TABLE” statement for payment table. The table structure should be the same.
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cat payment_table.sql <br>CREATE TABLE `payment` (<br> `payment_id` smallint(5) unsigned NOT NULL AUTO_INCREMENT,<br> `customer_id` smallint(5) unsigned NOT NULL,<br> `staff_id` tinyint(3) unsigned NOT NULL,<br> `rental_id` int(11) DEFAULT NULL,<br> `amount` decimal(5,2) NOT NULL,<br> `payment_date` datetime NOT NULL,<br> `last_update` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,<br> PRIMARY KEY (`payment_id`),<br> KEY `idx_fk_staff_id` (`staff_id`),<br> KEY `idx_fk_customer_id` (`customer_id`),<br> KEY `fk_payment_rental` (`rental_id`)<br>) ENGINE=InnoDB |
stop sandbox
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./sandboxes/msb_5_6_14/stop |
replace .ibd file (in my case the correct copy of it is located in my homedir)
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cp ~/payment.ibd ~/sandboxes/msb_5_6_14/data/test/ -f |
make sure permissions are ok for .ibd file
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sudo chmod 660 ~/sandboxes/msb_5_6_14/data/test/payment.ibd<br>sudo chown : ~/sandboxes/msb_5_6_14/data/test/payment.ibd |
start sandbox
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./sandboxes/msb_5_6_14/start |
Currently, if you’ll try to select something from the table you’ll get an error:
select from table
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mysql -umsandbox -pmsandbox --host=127.0.0.1 --port=5614 -e "select count(*) from test.payment"<br>ERROR 2013 (HY000) at line 1: Lost connection to MySQL server during query<br><br>mysql -umsandbox -pmsandbox --host=127.0.0.1 --port=5614 -e "select count(*) from test.payment"<br>ERROR 1146 (42S02) at line 1: Table 'test.payment' doesn't exist |
error log
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2013-11-02 14:36:34 b7eff990 InnoDB: Error: table 'test/payment'<br>InnoDB: in InnoDB data dictionary has tablespace id 7,<br>InnoDB: but a tablespace with that id does not exist. There is<br>InnoDB: a tablespace of name test/payment and id 10, though. Have<br>InnoDB: you deleted or moved .ibd files?<br><br>... ...<br><br>2013-11-02 14:36:36 11640 [ERROR] InnoDB: Failed to find tablespace for table '"test"."payment"' in the cache. Attempting to load the tablespace with space id 7.<br>2013-11-02 14:36:36 11640 [ERROR] InnoDB: In file './test/payment.ibd', tablespace id and flags are 10 and 0, but in the InnoDB data dictionary they are 7 and 0. Have you moved InnoDB .ibd files around without using the commands DISCARD TABLESPACE and IMPORT TABLESPACE? Please refer to http://dev.mysql.com/doc/refman/5.6/en/innodb-troubleshooting-datadict.html for how to resolve the issue.<br>2013-11-02 14:36:36 a31a2b90 InnoDB: Operating system error number 2 in a file operation.<br>InnoDB: The error means the system cannot find the path specified.<br>2013-11-02 14:36:36 11640 [ERROR] InnoDB: Could not find a valid tablespace file for 'test/payment'. See http://dev.mysql.com/doc/refman/5.6/en/innodb-troubleshooting-datadict.html for how to resolve the issue.<br>2013-11-02 14:36:36 a31a2b90 InnoDB: cannot calculate statistics for table "test"."payment" because the .ibd file is missing. For help, please refer to http://dev.mysql.com/doc/refman/5.6/en/innodb-troubleshooting.html |
How to Fix it? In 5.6 tablespace management is very improved so the only thing needed is “ALTER TABLE .. DISCARD TABLESPACE” and “ALTER TABLE .. IMPORT TABLESPACE”.
Please check also limitations: Tablespace Copying Limitations
Look at an example:
Discard tablespace
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mysql -umsandbox -pmsandbox --host=127.0.0.1 --port=5614 -e "alter table test.payment discard tablespace; show warnings;"<br>+---------+------+--------------------------------------------------------+<br>| Level | Code | Message |<br>+---------+------+--------------------------------------------------------+<br>| Warning | 1812 | InnoDB: Tablespace is missing for table 'test/payment' |<br>| Warning | 1812 | InnoDB: Tablespace is missing for table 'payment' |<br>+---------+------+--------------------------------------------------------+ |
Import tablespace
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mysql -umsandbox -pmsandbox --host=127.0.0.1 --port=5614 -e "alter table test.payment import tablespace; show warnings"<br>+---------+------+----------------------------------------------------------------------------------------------------------------------------------------------+<br>| Level | Code | Message |<br>+---------+------+----------------------------------------------------------------------------------------------------------------------------------------------+<br>| Warning | 1810 | InnoDB: IO Read error: (2, No such file or directory) Error opening './test/payment.cfg', will attempt to import without schema verification |<br>+---------+------+----------------------------------------------------------------------------------------------------------------------------------------------+ |
That’s it, data recovered, payment table accessible on 5.6 sandbox.
Now check if data exists in payment table on sandbox:
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mysql -umsandbox -pmsandbox --host=127.0.0.1 --port=5614 -e "select count(*) from test.payment"<br>+----------+<br>| count(*) |<br>+----------+<br>| 16049 |<br>+----------+<br><br>mysql -umsandbox -pmsandbox --host=127.0.0.1 --port=5614 -e "select * from test.payment limit 1G"<br>*************************** 1. row ***************************<br> payment_id: 1<br> customer_id: 1<br> staff_id: 1<br> rental_id: 76<br> amount: 2.99<br>payment_date: 0000-00-09 03:49:32<br> last_update: 2028-02-08 12:32:35 |
Exists.
So dump it from sandbox and restore on 5.5:
dump from 5.6
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mysqldump -umsandbox -pmsandbox --host=127.0.0.1 --port=5614 --add-drop-table test payment > ~/payment_dump.sql |
restore to 5.5
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mysql -u user -p < ~/payment_dump.sql |
Check if data exists on 5.5
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mysql -u root -e "select * from test.payment limit 3;"<br>+------------+-------------+----------+-----------+--------+---------------------+---------------------+<br>| payment_id | customer_id | staff_id | rental_id | amount | payment_date | last_update |<br>+------------+-------------+----------+-----------+--------+---------------------+---------------------+<br>| 1 | 1 | 1 | 76 | 2.99 | 0000-00-09 03:49:32 | 2028-02-08 12:32:35 |<br>| 2 | 1 | 1 | 573 | 0.99 | 0000-00-09 03:49:32 | 0000-00-00 00:00:00 |<br>| 3 | 1 | 1 | 1185 | 5.99 | 0000-00-09 03:49:37 | 0000-00-00 00:00:00 |<br>+------------+-------------+----------+-----------+--------+---------------------+---------------------+ |
During my work with this case, I got into a situation in which the drop table payment on 5.5 wasn’t possible because of payment.idb there wasn’t correct – so the server crashed each time I tried to access this table. The workaround is:
– stop server
– rm .ibd file
– start server
– drop table as usually by DROP TABLE command
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