InnoDB : MySQL's ACID-compliant Storage Engine

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MariaDB and XtraDB/InnoDB plugins

In my vps, I thought of switching from MySQL to MariaDB (using Monty's repository for Debian Squeeze). Copying over my.cnf from MySQL to MariaDB, I saw that the new config file (the one from the ...
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Why does Amazon RDS memory utilization drop and disk space utilization rises?

I encountered a problem with my Amazon RDS(db.m2.2xlarge) where DB connections spiked up and my website started responding slowly. On looking up the metrics I was not sure why my freeable memory shot ...
2
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1answer
51 views

mysqldump --single-transaction, yet update queries are waiting for the backup

If I use mysqldump --single-transaction, according to the docs it should do flush tables with read lock to get a consistent state and then start a transaction and no writers should be waiting. ...
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1answer
70 views

Need help to understand how information_schema.TABLES get updated

I created large innodb table mysql> select count(*) from big_data; +----------+ | count(*) | +----------+ | 23822336 | +----------+ checked the stats in informaion_schema.TABLES mysql> ...
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2answers
402 views

Which one to use? InnoDB Replication or MySQL Cluster?

I am building a url shortener and I use InnoDB as the storage engine for link data. I will start with a single VPS containing both application instance and MySQL database instance on the same Virtual ...
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2answers
32 views

Building a dedicated physical MySQL server [on hold]

I have a database that I use to mine a "primary" 20-column table with 18 million rows and growing by about 2 million a week, and that may accelerate. I am working to pre-process data by running PHP ...
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1answer
154 views

Mysql HY000 the table table_name is full when adding new column

I can't add a new column innodb table which size's 16MB. when I try to add, mysql says HY000 the table table_name is full. I changed my tmp_table_size and heap_size but mysql still says same error. ...
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2answers
691 views

How much data is needed to show MySQL Cluster's performance scaling vs. InnoDB

I am evaluating MySQL Cluster as a possible replacement for an InnoDB schema. So far, I have tested it with 10s of MB of data, and found MySQL Cluster slower than InnoDB; however, I have been told ...
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2answers
71 views

Restoring MySQL Tables from .ibd, .frm and mysqllogbin files

For some reason, when I try to open up my tables that are stored in .frm and .ibd files (whether on MySQL or phpmyadmin) it gives me a syntax error or it says it does not exist. I've read the other ...
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2answers
804 views

InnoDB Tablespace critical error in great need of a fix

Link to screenshot : http://www.nouvellesduquartier.com/i/1/p/Munin_%20Critical_MySql_InnoDB_.JPG (The value reported is outside the allowed range - Byte free, free, gauge, warn, critic) Question: ...
3
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1answer
486 views

Select * from statement execute very slowly, innodb io read speed is low

I have a very simple query " select * from ap_statistic " running in my servers. the servers have the same hardware and software configuration (CPU 8 core, mem :32G, OS: redhat 5.5, mysql version: ...
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6answers
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How can I optimize a mysqldump of a large database?

I have a symfony application with an InnoDB database that is ~2GB with 57 tables. The majority of the size of the database resides in a single table (~1.2GB). I am currently using mysqldump to ...
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2answers
56 views

How to monitor InnoDB Disk I/O using Server Status Variables?

This question is extension of my previous question "How to monitor InnoDB Disk I/O Required for MySQL? " As mention in my previous question i want to count total number of disk i/o per query, but ...
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2answers
170 views

MySQL runs out of memory when importing innodb database

I have a small VPS with 512MB RAM and no swap (can't have any). I am importing a 1.5GB innodb database with mysql -u -p < database.sql Before the operation can finish it says : Lost connection ...
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4answers
32 views

Converting to MyISAM, `foreign_key_checks = 0` Not Working

At the end of a long series of compromises working in a system I didn't design, own, or maintain, I need to convert a number of MySQL InnoDB tables to MyISAM tables. However, when I attempt to alter ...
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2answers
772 views

Why would increase in innodb_buffer_pool_size slow down MySQL?

5.1.68-cll - MySQL Community Server on CentOS The system has 32GB of RAM. I increased innodb_buffer_pool_size from 10240M to 15360M (10GB -> 15GB). Time taken for a series of identical operations ...
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1answer
19 views

MySQL Update Multiple Rows in Large Table

I have a large InnoDB MySQL database table. I would like to run this query against the database table: Update myBigTable Set someColumn=x WHERE userId = 7 OR userId = 88 OR userId = 22 OR userId = ...
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1answer
185 views

MySQL select by primary key against 100M of records within 30ms

I have no expirience with MySQL and database performance tuning in general. Wondering whether it is possible to perform a large number of selects against 100 millions of records by primary key within ...
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1answer
83 views

innodb completely crashed after interruption

I am having a major crash on mysql affecting a lot of websites. We had a crash on our SAN storage. Since that time, mysql refuse to start. I tried to reinstall mysql, but still no luck. I think ...
0
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1answer
1k views

What is the actual difference between innodb_autoinc_lock_mode 0,1,2

I would like to understand the differences between innodb_autoinc_lock_mode options 0,1 and 2 when parallel load data infiles are given. I see in "0" option, it locks the entire table and does the ...
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1answer
127 views

Innodb buffer pool indexes versus data usage

The server has 128GB of RAM. The innodb_buffer_pool_size is set to 106GB. mysql> show global variables like 'innodb_buffer_pool_size'; +-------------------------+--------------+ | Variable_name ...
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1answer
44 views

Restore InnoDB from .frm files

My database crashed and my PC and I now only have the .frm and .ibd files left. Is there any way to restore my database?
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0answers
30 views

MySQL Table with 568 columns: 1118, 'Row size too large…'

I'm currently migrating a database from Oracle to MySQL5.6. One table consists of 568 columns. When atempting to create the table I received this Error 1118, 'Row size too large..' I already ...
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2answers
54 views

Are there benefits to using more than 4 CPUs for MySQL?

We are running MySQL 5.5 on linux under VMWare, running on 2 CPUs. We are planning on increasing this to 4, but we have un-used CPUs available, and I'm wondering if there is any benefit to increasing ...
2
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1answer
55 views

Optimize Percona MySQL InnoDB 3.2TB database

(Before you will call me an idiot or start laughing, please remember it's a real deal on my side and I cannot cancel this assignment as it is a part of a bigger project) I have a database server that ...
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2answers
79 views

How to monitor InnoDB Disk I/O Required for MySQL?

I am doing an estimate on how much i/o[disk read write] on Mysql 5.6 [innodb storage engine], for getting idea how to calculate total number of disk read write i have searched a lot on SO on DA and ...
0
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1answer
95 views

InnoDB Failure of some kind

I have MySQL 5.5 installed. I tried to install Joolma but it failed. I went into their sql and replace EGNINE=InnoDB with MyISAM and the install worked. InnoDB is listed under SHOW ENGINES; Any idea ...
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0answers
12 views

Disable procedures for data load in MySql using Innodb engine

I have a database with an integrated ledger for a multi-unit company. As we bring new units into the database we load their existing ledger data into ours. Unfortunately the existing procedures on the ...
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2answers
610 views

How to run a cold backup with Linux/tar without shutting down MySQL slave?

I run the following before tar-ing up the data directory: STOP SLAVE; FLUSH TABLES WITH READ LOCK; FLUSH LOGS; However, tar will sometimes complain that the ibdata* and ib_logfiles* files are ...
0
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1answer
30 views

InnoDB issue after power outage a few weeks ago - no backup

A few weeks ago we had a power outage on one of our web servers that hosts several websites, we didn't think it affected anything and everything came back up as normal as far as we were aware. I have ...
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1answer
662 views

MySQL SELECT query hangs - Opening Tables INNODB

On my server I have 6 MySQL databases. They all power Wordpress websites. For some reason, 2 of these databases are not accessible. To my knowledge they use INNODB, but I can't confirm it as even ...
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1answer
3k views

MySQL Innodb corruption

I recently inherited a Drupal site that has an Innodb corruption. MySQL will run for sometime--usually about 24-hours but will eventually need to be manually restarted(see log output below). I have ...
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1answer
39 views

Safely changing innodb_buffer_pool_size on MySQL replication master?

We have a MySQL server which is a replication master. We need to change the innodb_buffer_pool_size and innodb_flush_method to (hopefully) improve performance as the database has grown. What is the ...
9
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1answer
7k views

InnoDB create table error: “Row size too large”

We have some engineers that flatten a normalized db structure into a temporary table for the purposes of generating a report. The columns are specified as TEXT NOT NULL (I know "why are they doing ...
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0answers
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Performance hit from moving DB to another drive symlink? [migrated]

We're considering moving one database (there are 4 of them in total) with InnoDB tables, to a separate partition in a Ubuntu 14.04 VPS. This DB gets read/write intensive (500 writes per sec, about ...
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2answers
1k views

MySQL hogging memory

An installation of MySQL 5.6.10 on a virtualized Ubuntu 12.04 is exhibiting massive memory hogging. The mysqld process claims the entire available memory within a couple of hours of uptime and forces ...
0
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1answer
51 views

Dedicated mysql server slow response [closed]

I have server in Kimsufi with 2gb RAM but my server is very slow , with simple hosting in ovh it responds quickly ... With pingdom.com test i have for server: 10 sec and simple hosting: 2sec is ...
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1answer
29 views

60M+ InnoDB table simple query performance HELP

I know it is a repeated question but really need help here. What can I do to improve the performance of this query? Considering that I have no freedom to change system variables/configs :( Thanks in ...
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1answer
41 views

Benefits of Barracuda and Compression

I've been reading about MySQL's file formats Antelope and Barracuda a while ago, and I wonder if I could benefit with having Barracuda and Compression. My server is currently using Antelope, as it is ...
0
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1answer
27 views

ROW_FORMAT - COMPRESSED vs COMPACT vs DYNAMIC

In MySQL InnoDB, what is the difference between COMPRESSED, COMPACT and DYNAMIC for ROW_FORMAT? What are the benefits between each other?
3
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2answers
138 views

MySQL 1264 warning from libmysql

I'm using the libmysql.dll library to connect to my database from a 3rd party application (metatrader). I managed to connect and things are going almost fine. I use mysql_real_connect and ...
0
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1answer
16 views

SHOW INNODB STATUS averages calculated

I am reading to all tutorials/books that when running SHOW ENGINE INNODB STATUS the Per second averages calculated from the last X sec, the X should be 20 to 30 seconds. I have never manage to exceed ...
0
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1answer
98 views

DB disk space requirements comparision between MySQL versions

I have 2 labs where MySQL is installed. DataBases are created and deleted dynamically by certain internal processes. InnoDB is the Engine used. In one lab, MySQL version 5.0.77 is installed. The DB ...
0
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1answer
45 views

Can't create table, but table doesn't exist

I'm using these steps to create a table my_user, that already existed but somehow vanished from my database my_db: mysql> USE my_db; mysql> DROP TABLE my_user; mysql> ERROR 1051 (42S02): ...
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1answer
57 views

Recovering from removal of ibdata1

I just upgraded from Debian Squeeze to Wheezy and mysql stopped working. Blindly following some advice without any understanding of what I was doing, I removed ibdata1 in an attempt to solve the ...
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1answer
30 views

Options to include with mysqldump when taking backup of hybrid databases

I'm planning on taking backups of all MySQL databases on a remote production server. The combined database size is around 2 GB. Most of the tables are InnoDB ~1.8 GB and the rest are MyISAM. Now I've ...
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2answers
1k views

MySQL information_schema doesn't update

I have a database, say abc, in mysql server. It has only one table named test. test uses innodb engine and I've set innodb_file_per_table to true. After I run the query delete from abc.test, I want ...
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2answers
734 views

Choosing MyISAM over InnoDB for these project requirements; and long term options

Sorry for the long post, but I had to give as much info as possible to make this very vague question more specific. My project's aim is to let users search a (huge) database of variety of products. ...
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1answer
235 views

Mysql Deadlock on update query on same row

My server is experiencing occasional deadlocks on two update queries on same row both using index (primary key). The conflicting queries are: UPDATE auth_user SET rep_score=185 WHERE ...
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0answers
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What is data like *after* fixing a corrupt MyISAM or InnoDB table?

I collect user data and store in an a database. Some of the tables are MyISAM and some are InnoDB. Lately, both have been experiencing regular corruption for reasons not clear. I know that restoring ...