I am trying to change the table engine from MyISAM to INNODB. I am using the
alter table tablename ENGINE=INNODB
command. I am not getting any errors or warnings on the mysql side. I also commented the
skip-innodb
line in my.cnf file. So when I do a
show variables like 'have-innodb%'
it gives me a "YES". Also just to be on the safe side, I also deleted my ib_logfile0 and ib_logfile1 and restarted my mysql server.
But it still does not change the engine. I also did a show engines, and it shows innodb as one of the available engines.
Also these tables are full of data and have around 5000 rows, so is changing the engine type when a table has data, would that be the problem??
What could the missing link be??
Are you able to restart the server? If so, the error log will tell you if it had problems initialising the InnoDB engine.
Is this the first InnoDB table in your db? If so, you may have forgotten to create your ibdata files.
Does the table use fulltext indexing or other InnoDB-incompatible features?
Related
We have a script that "rotates"/archive the Syslog tables in MySQL. This script:
at Linux level, renames the "MyISAM" tables files then compress them
then
inside MySQL, rename these tables
The 2 steps are "online". No MySQLd restart is required.
Now I built a new Syslog database in MariaDB (Debian Stretch). The tables are using InnoDB and not MyISAM. This script fails at the 2nd execution to rename the table inside MySQL after moving the file:
ERROR 1050 (42S01): Table 'SystemEvents_1' already exists
A reference of the table is kept somewhere (tablespace internal system table?) which prevents from doing that.
My question:
would it work if I migrate my tables to the ARIA engine with transactional=0?
Thanks, Vince
I think it is no longer possible.
I converted my tables to MyISAM (and even Aria with transactional=0) and had the same error message. I think the best is to use mysqldump to export the tables instead of directly renaming the filesystem files. Less convenient but mysqldump will always work regardless the choosen engine.
I want to use foreign key in MySQL. For that I needed to enable InnoDB feature. I have tried downloading latest version of MySQL Server from its official site.
I went through similar questions on stackoverflow but they addressed different issues.
I have tried editing all the .ini files and enabling InnoDB properties by removing # in front of corresponding properties.
Then I restarted MySQL and checked status of InnoDB from MySQL Client using query/
show engines;
It still shows InnoDB is disabled
I want to know steps of enabling the built in InnoDB feature for MySQL.
Here are the links to questions I visited:
Ques1
Ques2
Official MySQL forum
I am newbie in MySQL.
I will be very thankful for any help :-)
Check mysql log file. There could be some messages that may explain why InnoDB does not start. I suppose you don't have important InnoDB data. If so, try deleting ib_logfile0.xxx files and ibdata located in mysql data dir, then restart mysql to force those file to recreate. Also, check if innodb variables in my.cnf are properly configurated (For example, I have set memory for innodb_pool... to 1024G instead of 1024M, as a mistake).
I'm the lucker owner of a webhotel where the host changes settings without telling.
When thats said,
I have some tables in my database that are running with InnoDB engine.
But over the night the host have disabled InnoDB, so I cant convert it to MyISAM with ALTER command.
Anyway I can get the data out of the database, or convert it to MyISAM when InnoDB is disabled?
Only thing I see all the time is,
#1033 - Incorrect information in file: 'file.frm'
Thanks.
Unfortunately, you need to have InnoDB enabled so that MySQL could read the data for conversion.
To recover the data on another instance, you would need ibdata* files from MySQL root data directory as well as all *.ibd files from your database directory (if your MySQL setup had innodb_file_per_table enabled).
I'm trying to run a rather large query that is supposed to run nightly to populate a table. I'm getting an error saying Incorrect key file for table '/var/tmp/#sql_201e_0.MYI'; try to repair it but the storage engine I'm using (whatever the default is, I guess?) doesn't support repairing tables.
how do I fix this so I can run the query?
You must change the location of MySQL's temporary folder which is '/tmp' in most cases to a location with a bigger disk space. Change it in MySQL's config file.
Basically your server is running out of disk space where /tmp is located.
You'll need to run this command from the MySQL prompt:
REPAIR TABLE tbl_name USE_FRM;
From MySQL's documentation on the Repair command:
The USE_FRM option is available for use if the .MYI index file is missing or if its header is corrupted. This option tells MySQL not to trust the information in the .MYI file header and to re-create it using information from the .frm file. This kind of repair cannot be done with myisamchk.
Your query is generating a result set so large that it needs to build a temporary table either to hold some of the results or some intermediate product used in generating the result.
The temporary table is being generated in /var/tmp. This temporary table would appear to have been corrupted. Perhaps the device the temporary table was being built on ran out of space. However, usually this would normally result in an "out of space" error. Perhaps something else running on your machine has clobbered the temporary table.
Try reworking your query to use less space, or try reconfiguring your database so that a larger or safer partition is used for temporary tables.
MySQL Manual - B.5.4.4. Where MySQL Stores Temporary Files
The storage engine (MyISAM) DOES support repair table. You should be able to repair it.
If the repair fails then it's a sign that the table is very corrupted, you have no choice but to restore it from backups.
If you have other systems (e.g. non-production with same software versions and schema) with an identical table then you might be able to fix it with some hackery (copying the frm an MYI files, followed by a repair).
In essence, the trick is to avoid getting broken tables in the first place. This means always shutting your db down cleanly, never having it crash and never having hardware or power problems. In practice this isn't very likely, so if durability matters you may want to consider a more crash-safe storage engine.
Simple "REPAIR the table" from PHPMYADMIN solved this problem for me.
go to phpmyadmin
open problematic table
go to Operations tab (in my version of PMA)
at the bottom you will find "Repair table" link
In my case, there was a disc space issue. I deleted some unwanted war files from my server and it worked after that.
REPAIR TABLE tbl_name USE_FRM;
Command only run when MySQL 'Storage Engine' type should be 'MyISAM'
Hope this helps
this issue is because of low storage space availability of a particular drive(c:\ or d:\ etc.,), release some memory then it will work.
Thanks
Saikumar.P
This happenes might be because you ran out of disk storage and the mysql files and starting files got corrupted
The solution to be tried as below
First we will move the tmp file to somewhere with larger space
Step 1: Copy your existing /etc/my.cnf file to make a backup
cp /etc/my.cnf{,.back-`date +%Y%m%d`}
Step 2: Create your new directory, and set the correct permissions
mkdir /home/mysqltmpdir
chmod 1777 /home/mysqltmpdir
Step 3: Open your /etc/my.cnf file
nano /etc/my.cnf
Step 4: Add below line under the [mysqld] section and save the file
tmpdir=/home/mysqltmpdir
Secondly you need to remove or error files and logs from the /var/lib/mysql/ib_* that means to remove anything that starts by "ib"
rm /var/lib/mysql/ibdata1 and rm /var/lib/mysql/ibda.... and so on
Thirdly you will need to make sure that there is a pid file available to have the database to write in
Step 1 you need to edit /etc/my.cnf
pid-file= /var/run/mysqld/mysqld.pid
Step 2 create the directory with the file to point to
mkdir /var/run/mysqld
touch /var/run/mysqld/mysqld.pid
chown -R mysql:mysql /var/run/mysqld
Last step restart mysql server
/etc/init.d/mysql restart
I just resolved a similar issue “Incorrect key file:\bonga_process\alarms.MYI’:try to repair it”
How I resolved it:
I started the server configuration application, ServerConfiguration.exe
Maitenance tab
Click on Repair tables command button
Prompts to delete files to free disk space appear with Manage Storage command
button
Click on Manage Storage command, this will run a take you to some files you need to delete to free more disk space. Delete any useless files.
Restart the system auditor application
Apply proper charset and collation to database, table and columns/fields.
I creates database and table structure using sql queries from one server to another.
it creates database structure as follows:
database with charset of "utf8", collation of "utf8_general_ci"
tables with charset of "utf8" and collation of "utf8_bin".
table columns / fields have charset "utf8" and collation of "utf8_bin".
I change collation of table and column to utf8_general_ci, and it resolves the error.
Change to MyISAM engine and run this command
REPAIR TABLE tbl_name USE_FRM;
I just went to look over one my site's databases and noticed that all of the tables had been converted to MyISAM (they used to be InnoDB).
What's more is that InnoDB seems to missing, along with BerkeleyDB, Federated, and others.
A few months ago I upgraded from MySql 5.0 to 5.1.38. I can't imagine that I wouldn't have noticed if InnoDB was not installed after the upgrade, but maybe it's been that way since the upgrade. Having several 10 GB tables automatically convert themselves to MyISAM without hearing about any downtime seems very unlikely to me.
Regardless, the mysql system variable have_innodb is set to NO. Can I simply change that to YES or does that mean InnoDB is missing from the install?
Maybe InnoDB parameters were changed during upgrade? This advice from MySQL Forums helped me in a similar situation: http://forums.mysql.com/read.php?22,397052,408970
In short: Stop the MySQL daemon, delete ib_logfile* from datadir, restart MySQL.
If the field in SHOW ENGINES is "no" it means it's not compiled in. You would have to either compile the server again, compile the innodb plugin and load it or fetch server binaries which have it enabled.
You can't simply set the mysql system variable to YES to convert the table from MyISAM to InnoDB.
ALTER TABLE t1 ENGINE=InnoDB;
When InnoDB support is turned off even is you use ENGINE=InnoDB in your create table statements, the table will use the default storage engine for MySQL which is normally MyISAM.
It could also be the case that the innodb logfile[01] are corrupted. In which case the engine will show as disabled and the tables as ISAM. The log will mention it.