InnoDB is the main ACID-compliant Storage Engine used in MySQL.

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mysql innodb index creation for foreign keys

INNODB automatically creates an index on foreign key fields. Is there a storage engine that allows me to disable that? My googling on xtradb doesn't give me positive results. Perhaps, it is possible ...
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81 views

What are some general tips to make InnoDB for MySQL perform at its highest?

I've been using MyISAM exclusively for several years now and know the ins-and-outs pretty well of how to optimize it, but I've just recently started using InnoDB for some of my tables and don't know ...
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982 views

MySQL / InnoDB / Incorrect key file for table Error

I keep seeing this pop up in my logs every few hours. Trying to get property of non-object -- Incorrect key file for table '/tmp/#sql_ad2_2.MYI'; try to repair it I ran mysqlcheck on all tables, ...
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208 views

What will happen if MySQL cannot write to InnoDB log?

What happens to MySQL if the partition that contains InnoDB's log files (innodb_log_group_home_dir) becomes full, read-only or otherwise unwritable? If this did happen, what recovery process would ...
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850 views

InnoDB Buffer pool hit rate missing from engine status output

I want to check the buffer pool hit rate for InnoDB on MySQL but when I query the database the hit rate seems to be gone from the results: Using query: SHOW ENGINE INNODB STATUS\G ...
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Unable to enable InnoDB in mySQL on Ubuntu 10.04

I am trying to enable InnDB on my linux server. I have installed Ubuntu 10.04 JeOS on an ESX server. I then installed mySQL and tomcat using aptitude. However when I use SHOW ENGINES; in mySQL it ...
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479 views

Disable innodb_file_per_table

I have 24GB RAM i7 dedicated server, running CPanel 11.36 with MySQL 5.1.68. In my.cnf I have innodb_file_per_table enabled. Is it safe to just disable the option, not doing any damage to databases in ...
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4k views

Huge #sql-xxxx_xxxx.ibd files in mysql-data folder

On one of our mysql databases the size on disk is way larger (28GB) than the actual data (~5GB) so I had a closer look to the files contained in mysql-data I see the following files 12K ...
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458 views

Can transactions be forced to occur sequentially in MySQL?

Let's say that I have two servers that simultaneously initiate a transaction on a MySQL 5.5 database using InnoDB. Both transactions do the same thing: Read a single row, then update the row based on ...
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17k views

Optimal MySQL my.cnf setting for large Magento site on a dedicated server

Our dedicated server is running a large Magento store with a MySQL database approximately 250MB in size. The server spec is listed as having 5 Xeon 2Ghz processors (4MB cache) and 12GB of memory. ...
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84 views

Should I upgrade memory for my dedicated server?

My memory usage hangs around 25% (swap is generally 1%) on my dedicated server and load is around 2-5. My host recommended that I upgrade from 2GB of ram to 4GB so that I can increase my ...
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316 views

MySQL: Increased buffer pool, ibdata1 corrupt?

I tried increasing innodb_buffer_pool_size via my.cnf from default 128m to 256m, but on restart attempt, mysql shutdown failed with: 130125 11:49:55 InnoDB: Initializing buffer pool, size = 256.0M ...
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1k views

SHOW ENGINES; does not list InnoDB

Since yesterday, my InnoDB tables in my Mysql installation on Ubuntu don't work anymore, I tried to open them using Navicat, but I get the "Unknown Table engine 'InnoDB'" error. When I try listing ...
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174 views

Strange MySQL table problem

I have copied the /var/lib/mysql/mydbname db to a new machine from a crashed server (booted using a live cd) but now I cannot access the tables within the db... All the tables only have a .frm ...
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4k views

Changing innodb_buffer_pool_size on the fly

I'm wondering if it's possible to change the innodb_buffer_pool_size on the fly. It looks like the buffer pool has been over allocated on my server and it's swapping now. I've changed this value on ...
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1k views

Mysql start fails with Operating System error 13

I have XAMPP on my Ubuntu Lucid system and everything worked fine. But there seems to be some problem now and mysql wouldn't start. I had tried to recover a few Drupal databases and hence copied ...
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1k views

Will dropping AUTO_INCREMENT rebuild table in MySQL?

I've got table with following schema: CREATE TABLE `tblsomething` ( `something_id` int(11) NOT NULL AUTO_INCREMENT, … PRIMARY KEY (`something_id`) ) ENGINE=InnoDB AUTO_INCREMENT=144620955 I ...
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3answers
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moving live innodb db from one server to another

I need to move an innodb db from one server to another - it is also going from mysql > mariadb. I want to ensure there are no problems at all and with that I will be using mysqldump to export and ...
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1k views

how to permanently increase innodb_buffer_pool_size on ubuntu

I have read lot of posts & manuals to try to find out how to increase memory in mysql 5.6 on Ubuntu, which say there are 3 methods: by editing innodb_buffer_pool_size in the my.cnf by command ...
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401 views

Mysql crashed, dumped DB's in recovery mode. What now?

I ran into an InnoDB issue that only seemed to get worse as I tried to fix it. Started with InnoDB: Unable to lock ./ibdata1, error: 11, I moved and then copied it back. I soon had an ib_logfile issue ...
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1answer
153 views

Check if MySQL configuration was applied

I'm performing some heavy MySQL operations at my VM and constantly getting the following error: SQLSTATE[HY000]: General error: 1206 The total number of locks exceeds the lock table size I ...
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97 views

Setting innodb_buffer_pool_size in for Mysql

We have a dedicated DB box with with 8 GB of RAM and running Redhat linux 64 bit OS. Our MySQL Data + Index size almost 7.8 GB. About setting innodb_buffer_pool_size, I have read 2 suggestions Set ...
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782 views

MySQL “Too many connections” + > 6000 queries / second

We have quite a big mysql (innodb) database with a lot of insert queries and 6000 queries per second. Settings are: max_connections = 1000 and usually when i do show status like '%onn%'; ...
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2k views

innodb corrupt tables

Running shared hosting cpanel box with Mysql 5.5. Restoring or packaging (using pkgacct) is giving off some serious database errors, on multiple various users sum_joom954.jos_wf_profiles OK warn ...
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Percona-xtrabackup hot backup issue with MyIsam Engine

We are running with the MyIsam Engine and Percona-xtrabackup is throwing the following error as the inndb engine is skipped [ my.cnf skip-innodb]. How could I resolve this issue with out enabling the ...
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1k views

Safe conversion from one InnoDB(ibdata) file to innodb file per table

I have MySQL database with tables on InnoDB engine. But server is configured to use only one file ibdata0 without parameter innodb_file_per_table. I want to change this without making dump and restore ...
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1k views

MySQL, check & enable binary logs

I am running MySQL 5.1.47 on CentOS. How do I check if binary logging for InnoDB is active? How do I enable binary logging if they are not enabled? Just run? mysqld --log-bin
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1k views

MySQL server not starting up

I have a server running CentOS 5.5 x86_64, and have recently installed MySQL Server via YUM, but when starting the server I get: [root@server etc]# service mysqld start Warning: World-writable ...
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599 views

Moved mySQL to an EBS volume, now innoDB performs very slowly

Hello has anyone had a similar problem to this.. I've set up a new instance on Amazon EC2 for a client. I've also attached a 250GB EBS volume to hold the files and configured mySQL to use the EBS ...
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1k views

Mysql: Innodb error when migrating mysql from linux to windows

I have migrated my data directory for an InnoDB mysql server from a linux machine to a windows machine. I started the server up, selected the database, and tried to query a table. Got the error "Table ...
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138 views

Explaining the MySQL Indexing

On my journey exploring MySQL and its advanced features, especially regarding the performance optimization I bumped in some extremely important feature for SQL performance improvement mos of us knows ...
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1k views

Unable to start mysqld due to inability to allocate memory

I'm unable to start mysqld due to it being unable to allocate enough memory. I've installed the DB using the defaults: sudo mysql_install_db --user=mysql Then when I try to start mysqld, I get ...
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180 views

MySQL - Innodb, search

I recently switched from myisam to innodb in one of my mysql tables. Before i was using MATCH(). Since innodb doesn't support match() i decided to use LIKE. Now I have a problem. My table is 190,6 ...
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1k views

Is it ever safe to set innodb_flush_log_at_trx_commit=0?

I have a server (Dell PE2950) with a battery-backed write cache on the raid controller. Is it safe for me to set innodb_flush_log_at_trx_commit=0 on a mysql server with data files stored on a raid0 ...
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1answer
92 views

MariaDB won't start - fails to check integrity

I have a MariaDB installed with brew in my macbook. Worked fine till today. All of a sudden it wound not start: -> mysql.server start Starting MySQL ERROR! also, if I issue mysql -uroot or any ...
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54 views

Mysql master slave replication fail PID error

I have Master on 5.6 & Slave on 5.5, this will be the test ENV to check if 5.6 can replicate on 5.5 on PROD. I am getting this below error when starting mysql ERROR! MySQL server PID file ...
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211 views

Unusually high RDS MySQL memory

could use your help in understanding this. I'm running an RDS MySQL instance (db.m3.large on SSD) with 100GB of storage. I'm a little freaked out that my memory is 50% there: I must be doing ...
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748 views

InnoDB “Table xx Is Full” during database alterations

I am running Percona Mysql Server 5.6.14-56 on CentOS 6.3 64bit. Server has plenty ram (96gb) and storage free. File system type: ext4 dev/sda6 ext4 1093623528 56576512 981494148 6% ...
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1answer
405 views

MySQL crashing at service start. Hit a bug? DB corruption?

I've a web server that's offline at this moment because MySQL fails to start with an exception. I can't find the root cause of the problem, but I'm afraid of database corruption crashing the MySQL ...
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1answer
119 views

Set MySQL innodb buffer pool size on IIS7

I am using VPS, Windows 2008 r2, IIS7, MYSQL 5.1.73, Hardward Config: Ram 2GB , Hardisk 40GB On this VPS only 1 .NET application is running. Application is currently using by only 5 users. I found ...
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1answer
161 views

Re-ocurring issue with keys on temp tables

We run a large forum with lots of reads and writes, particularly to the posts and topics tables which are both innodb. Last week I started doing 12 hourly backups with innobackupex because mysqldump ...
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1k views

restore mysql from ibdata/frm files

A hard disk failure has left me trying to restore mysql from copy of "data" folder I had dumps of "most" content but am missing some Data folder has idbdata1 / log files / folders of .frm files So, ...
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1answer
7k views

MySQL failed to start. Error 1053. Windows Server 2008 R2

I did a server restart for my web server and on restart, MySQL won't start. If I use taskmanager to kill mysqld.exe and try the start from services console, it gets about 50% through the startup, ...
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1answer
163 views

Large InnoDB data size even though entire database is MyISAM?

I'm running mysqltuner to tune up my database and I'm running into a very strange occurrence. Even though the entire database is MyISAM (all tables) it says the following: [!!] InnoDB data size / ...
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1k views

Cannot stop MariaDB on Ubuntu Lucid

On starting MariaDB 5.5 I am getting the following error: InnoDB: Unable to lock /var/lib/mysql/ibdata1 Initially ran into this error after a server reboot was done running MariaDB 5.1. Have ...
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2k views

MySQL too many connections during normal conditions (Percona, InnoDB)

We're getting too many connections errors in normal conditions, so I'm assuming it's a configuration issue. Four webservers, not using persistant connections partly because that triggers to the too ...
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1answer
215 views

Why does MySQL use a different index for my query in different versions?

I have a large-ish InnoDB table (about 800MB), and I'd like to count rows. I know SELECT COUNT(*) has issues in InnoDB, but one of the solutions I've seen is to create a secondary index, which is ...
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287 views

In MySQL 5.1 InnoDB, does the maximum length of a VARCHAR affect secondary index size? [closed]

Assuming the data is the same either way, does the maximum length of the VARCHAR affect the space usage of a secondary index? Does InnoDB use fixed length records for indexes? Assume that we're ...
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2answers
5k views

MySQL server crashes InnoDB

Today we got some DB crash. The DB is InnoDB. At firstin log: 120404 10:57:40 InnoDB: ERROR: the age of the last checkpoint is 9433732, InnoDB: which exceeds the log group capacity 9433498. InnoDB: ...
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2answers
967 views

MySQL InnoDB database 'hangs'

I have a problem with a MySql server causing it to freeze all the time. In phpMyAdmin when this happens I can see in "Show Processlist" are lots of processes for User "unauthenticated user" with ...