InnoDB : MySQL's ACID-compliant Storage Engine

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MySQL HDD activity with empty process list

What does this mean and how can I understand what is mysql doing? I use InnoDB, my database is huge. This happens when I disconnect my app. Thanx.
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Which hardware you suggest?

I'm completely new to buying a database hosting and I would greatly appreciate your opinion about the following situation. I just created an App and I want to go live this weekend. I want to be ...
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InnoDB tables inaccessible after reboot

After reboot each time, I can't see my InnoDB table. However, when use command mode I can see my tables, but cannot access to it. mysql> show tables; +----------------------+ | ...
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mysql innodb_flush_log_at_trx_commit clarification

I have been reading up on innodb as a storage engine, mainly because I have recently moved to AWS and they do not recommend myISAM which my databases current run on (and have for about 10 years) So ...
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421 views

mysqldump freezing on a specific table

I dumped a database (sys_data) which is very big (800GB, all data in one ibdata file) from a remote server. But the dump was blocked at a table (tb_trade_376). My dump command: mysqldump -uxx -pxx ...
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944 views

MySQL - Export two columns from large table without causing a lock

I am a sysadmin who doesn't do a ton of dba stuff. For a project, I have access to a production server--which I am not the sysadmin for--with an enormous 40,000,000 row >10 GB MySQL InnoDB table. I ...
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MySQL dynamically optimize innodb tables without “file per table” setting

We are getting a “too many connections” error once a week the same time a mysql procedure runs. The procedure runs “optimize table” on hundreds of tables and takes nearly ten hours to finish, taking ...
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137 views

Is there an advantage to moving to 'real' date partitions on MySQL 5.5?

We are using partitions per day for some our tables. We started with MySQL 5.1, so we had to partition using the to_days (end_time is a datetime column): ENGINE=InnoDB DEFAULT CHARSET=utf8 ...
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415 views

what happens when InnoDB logspace is too small

I've just seen several mysql errors in my log: InnoDB: ERROR: the age of the last checkpoint is X InnoDB: which exceeds the log group capacity Y I understand, that I do have to increase the ...
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598 views

Why InnoDB ALTER TABLE is so slow? [closed]

The machine has a 4-core hyper-threaded Intel i7 670 @ 2.8GHz, 16G RAM, 8G of which is InnoDB buffer pool. The database resides on Intel SSD disk. DBMS is MariaDB 5.5.30 x64 running under Windows ...
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InnoDB data back in 3 months after OS shutdown

I've got an interesting issue last week that after shutting down an instance of mine, all data were back in 3 months (like a big rollback), even though there is no sign of crashing, recovery crash ...
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Sorting Result state taking very long time

I am using a MySQL 5.1.69-log DB for analysis purpose. I've designed my database in a star schema. All tables are using InnoDB. My innodb_buffer_pool_size=2Gb This is the query I am running : ...
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221 views

Updating an FTS indexed column returns “Invalid InnoDB FTS Doc ID”

Environment: Ubuntu 12.04 (and 13.04) MySQL 5.6.11 I have a table which has a full text index on it (real table has much more columns and rows): DROP TABLE IF EXISTS articles; CREATE TABLE ...
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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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2answers
375 views

Help my database isn't performing fast enough! 100M Merge with 6M need < 1 hour!

I have a server right now receiving more raw data files in 1 hour then I can upsert (insert -> merge) in an hour. I have a table with 100M (rounded up) rows. Table is currently MyISAM. The table has ...
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How to solve “The table … is full” with “innodb_file_per_table”?

I have a MySQL database that holds a large amount of data (100-200GB - a bunch of scientific measurements). The vast majority of the data is stored in one table Sample. Now I'm creating a slave ...
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1answer
2k views

Is it possible to force drop of mysql tables with FK?

For dropping a table in which a Foreign Key is used in other tables, it is necessary to drop all other tables having FK connection with the corresponding table. Is there a short way to drop a table, ...
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Will Partitions and Indexes on the same table help in performace of Inserts and Selects?

I have a table containing the list of visitors and this table has the following information. Visitor Browser Information Visitor Location Information Visitor Time Information No of Visits I have a ...
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Innodb table is taking randomly long time to execute the insert query and in show processlist showing as queryend/updating

Innodb table is taking randomly long time to execute the insert query and in show processlist showing as queryend/updating and it happens for the similar queries for the same table and the queries got ...
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1answer
415 views

Percona xtrabackup Prepare Fails

I made a backup and according to Percona it completed successfully. Now I'm trying to prepare it and having the following issue: ./xtrabackup_55 --defaults-file="/etc/my.cnf" ...
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447 views

Would Mongo's ObjectID work well in InnoDB's clustered index?

Mongo's ObjectID is defined like this: ObjectId is a 12-byte BSON type, constructed using: a 4-byte value representing the seconds since the Unix epoch, a 3-byte machine identifier, ...
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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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Allocating 8GB memory to MySQL on a 64bit system

Specs - MySQL 5.0.x , Redhat 5.9 , Physical memory - 16GB I am trying to set innodb buffer pool size to 8GB (innodb_buffer_pool_size=8G). When i do, and start mysql, i get following error - ...
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Storing history of full/partial tables

I'm building a web-application with Django and MySQL (InnoDB) and am currently pondering over how to manage historical changes on various tables. I wonder if it's efficient to store a lot of rows ...
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TokuDB/InnoDB Question

What's the faster scheme for insert data to TokuDB or InnoDB Engine? Over 200 Insert per second. That's okay to answer of one engine. TABLE: `game` `gameId` bigint 20 (PK) `gameMapId` int 4 ...
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Is it better to use AUTOCOMMIT = 0

Is it better to use (for perfomance tuning) AUTOCOMMIT = 0 before bulk inserts of data in MySQL, if the insert query looks like INSERT INTO SomeTable (column1, column2) VALUES ...
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Partitioning and freeing disk space

I am running MySql innodb with innodb_file_per_table. As a daily script, I would like to create a new partition for a set of tables, as well as delete yesterday's partitions. What command would need ...
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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: ...
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InnoDB Tablespace critical error in great need of a fix [duplicate]

Link to screenshot : http://www.nouvellesduquartier.com/i/1/p/Munin_%20Critical_MySql_InnoDB_.JPG Question: Could the error shown on the screenshot be the reason why my site is very slow?
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157 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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Large INSERTs performance optimization

I have 15 Amazon AWS EC2 t1.micro instances which simultaneously populate Amazon RDS MySQL d2.m2.xlarge database with data using large INSERTs (40000 rows in query). The queries are send ...
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Ubnutu/MySQL - Error “Unable to locate package innotop”

I am using Ubuntu 12.04.2 LTS, with MySQL 5.5.29. Im trying to install innotop for database monitoring, but getting an error "Unable to locate package innotop" root@server1:~# apt-get install ...
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Configuring MySQL (my.cnf) for MyISAM and InnoDB

I want to convert some (not all) the MyISAM tables to InnoDB. Here is my current my.cnf: pastebin.com/FW8YXtLQ What would be the best configuration? (need to add InnoDB settings, byecause there are ...
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1answer
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How can I make a select statement get blocked?

Hello I am trying to intentionally make a SQL select statement get blocked by another simple SQL delete or update statement, for the purpose of learning. I prefer only InnoDB tables. To prepare the ...
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How can I get this query to use it's index?

Queries matching this query below shows up in the slow log (with different contentVersionId & modifiedDateTime). As I don't really know what I'm doing I tried adding indexes to all columns in ...
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Is it okay to use rsync on InnoDB database if the MySQL server is shutdown?

Is it okay to use rsync on InnoDB database if the MySQL server is shutdown ? For example : /etc/init.d/mysql stop rsync -av /home/mysql/mydb/ root@newserver.com:/home/mysql
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Lock wait time out exceed restart transaction

I had got error on the lock wait time out so below I got 3 samples taken. One I took before the increase innodb_lock_wait_timeout to 120. So is there anything else I must tweak based on the logs ...
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TokuDB not much faster than MySQL

I have converted a MySQL database with 80.000.000 rows to TokuDB. Now when I run: select count(id) from xxx where active=1 it takes 90% of the time of the normal MySQL request. What do I have to ...
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1answer
921 views

Table corruption: How to perform Innodb Checksum checks in MySQL 5.5 for Windows?

Having a corrupted Mysql 5.5.31 (Windows) database, my question relates to the the top solution provided in How do you identify InnoDB table corruption? , more precisely to the following script that ...
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Issue after moving the ib_logfile1 and ib_logfile0 files

I wanted to increase the innodb_log_file_size for better performance. And I increased it from the default value to 256 MB. As usual I got the error saying InnoDB: Error: log file ./ib_logfile0 is of ...
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InnoDB errors after having deleted “ibdata1”

By accident, I have deleted the ibdata1 file in the MySQL directory because MySQL wasn't functioning correctly. After reading so many forums, I found a post that recommended deleting the 3 files ...
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363 views

MySQL InnoDB does not return the last row on select with DESC order

We have a table scheme like following: CREATE TABLE IF NOT EXISTS `offers` ( `id` int(11) NOT NULL AUTO_INCREMENT, `campaign_id` int(11) NOT NULL, `user_id` int(11) NOT NULL, `price` double ...
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2answers
2k views

How to tune mysql to be inmemory-like

I've given MySQL 5GB of memory (I use innodb), but when I insert lots of data (dumpfile is 1GB), hard drive I/O is still a bottleneck (CPU is not busy and hard drive is). Is it possible to force ...
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What is the size of currently-existing tmp tables in innodb?

This is yet another "how to add a column to a gigantic table" question. The table on disk takes 2.5GB, and I have around 10GB of ram I can use. I have a feeling I can crank up the tmptablesize option ...
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383 views

Issues converting MyISAM table to InnoDB (auto column issue)

I'm having issues trying to convert a table from MyISAM to InnoDB in MySQL 5.6. The following is the table dump: -- -- Table structure for table `companies` -- DROP TABLE IF EXISTS `companies`; ...
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InnoDB tuning with 1G of ram limit

I am trying to calculate variable moving averages crossover with variable dates. That is: I want to prompt the user for 3 values and 1 option. The input is through a web front end so I can build/edit ...
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4k views

Unable to drop the table since its showing waiting for meta data lock

We are trying to drop one table but it's getting hanged, and when we see the 'SHOW PROCESSLIST' command it's showing as 'waiting for meta data lock'. Even we are unable to perform any operation on ...
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1answer
7k views

MySQL: Error reading communication packets

I get this warning in mysql, [Warning] Aborted connection 21 to db: 'MyDB' user: 'MyUser' host: 'localhost' (Got an error reading communication packets) I have been through few topics in google ...
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2k views

Will OPTIMIZE TABLE have any impact on my data?

I'm having issues with a database that is getting quite slow. The analyzer in phpMyAdmin recommends that I run OPTIMIZE TABLE on my tables. But before doing so, I would (of course) like to know if ...
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How can Innodb ibdata1 file grows by 5X even with innodb_file_per_table set?

I have innodb_file_per_table set and just today my ibdata1 file jumped from 59M to 323M after I made several changes to an 800M table to reduce it to about 600M. That particular table's .ibd file was ...