InnoDB : MySQL's ACID-compliant Storage Engine

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Setting default CHARSET and DB Engine

I recently updated my server's database system from MySQL to MariaDB. After update, everything works well. But, when I went to phpMyAdmin, the default charset and types are changed: At the end of ...
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Putting a Select statement in a transaction

What is the difference between these 2 queries: start transaction; select * From orders Where id=1; UPDATE orders SET username="John" Where id=1; commit; And without transaction: select * From ...
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InnoDB: error: space object of table

131212 10:35:18 InnoDB: error: space object of table 'main/wp_m_membership_levels', InnoDB: space id 119 did not exist in memory. Retrying an open. 131212 10:35:18 InnoDB: error: space object of ...
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222 views

Making cloned copies of a innoDB mySQL database

I'm trying to find a better way to clone innodb mysql database then using regular import. We use an innoDB mySQL database in production. A backup is created daily from production. Currently each ...
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1answer
706 views

MySQL backup InnoDB

I have a VoIP server running 24x7. At low peak hour at lease 150+ users are connected. My server has MySQL running with InnoDB engine on Windows 2008 platform. I like to take at least 2 times full ...
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2answers
479 views

How to store logs correctly?

(This is somewhat a follow up on my last question) I am using MySQL 5.5 with innodb. My Log table consists of two columns. One for user number, and the other for a string consisting of IP, request ...
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1answer
1k views

mysql innodb space x did not exist in memory

Into my innodb log I got the errors below. How to fix? What did it mean? Some tables are corrupted but not all. InnoDB: space id 1753 did not exist in memory. Retrying an open. 130906 16:31:27 ...
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Analyzing MySQL crash due to corrupt InnoDB page. Failed page checksum

Lately we have been pestered by infrequent sporadic database crashes on one of our MySQL instances. Each time it is due to a failed page checksum. It happens on a specific database but spans multiple ...
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1answer
1k views

Timeout on ALTER TABLE table ENGINE=InnoDB - is table still converted?

I'm converting tables in an old MYISAM database to InnoDB to increase robustness in case of power loss etc. I'm using Mysql 5.5.x Before doing the production system, I am doing a trial run on a copy ...
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1answer
417 views

Can MySQL use an index to calculate SUM?

The following query is run in a MySQL database (all InnoDB tables, Percona 5.5), and is slow for some parameter values (i.e. for some large customers). It returns the total size of all files uploaded ...
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1answer
847 views

TCP sockets bottleneck with InnoDB/Debian?

We have a big mysql performance issue on a production environment with 18 "front" servers sending mysql queries to a unique mysql server. We are using Redis on each front server for a number of things,...
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1answer
112 views

DROP TABLE on a huge InnoDB table

I have an innodb table with over 140 million rows taking 26GB. I would like to drop this table however this is taking way too long, probably days. How can I speed up this query? processor: Intel® ...
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2answers
119 views

Where/how does innodb store tables in files?

I read somewhere that InnoDB can store all the tables in a single file or in separate files. Is this a configuration option? What is the default setting? A file for all tables or a file per table? ...
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1answer
81 views

When is the index actually created?

I have noticed that even on huge tables with millions of records when I do a CREATE INDEX the index is created immediately (I get the console back in nsecs). Why is this? Doesn't it create the B-Tree ...
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2answers
13k views

How to set Innodb Buffer Pool Size [duplicate]

I have a database using innodb completely. Its now having a innodb_buffer_pool_size at 128MB. Which I know is very less for my user. But no matter what I do it won't change. I have added a value of ...
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1answer
1k views

How to copy a table in a production server without WRITE lock and without writing to a file

I'm trying to copy a table in a production table. When I'm performing on InnoDB tables: INSERT INTO new_table (SELECT * FROM table) I have a write lock on table. Is it possible to avoid this lock? ...
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2answers
305 views

MySQL (InnoDB) UPDATE SET performance with value in WHERE AND clause

If an UPDATE query is performed where the values being SET are also part of the WHERE clause, in the form of an additional AND statement on the column being set's value, is there a significant ...
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57 views

Help with Mysql with 100K+ Table

Hi im trying to develop a database design in which its gonna have 100K+ tables residing in it. My major concern here is will Mysql be able to hold that much amount of tables with no performance ...
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1answer
8k views

InnoDB log sequence number is in the future

130711 23:03:40 InnoDB: Error: page 23 log sequence number 3336825872455 InnoDB: is in the future! Current system log sequence number 235089. InnoDB: Your database may be corrupt or you may have ...
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204 views

How much RAM do I need?

Let's assume a query like the following as typical: select A.`date` as `date`, count(*) as N from A as A join B as B on B.id = A.b_id join C as C on C.id = B.c_id join D as D on D.id = C....
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1k views

Fastest way to perform simple operations on 1 million rows

I have a simple table with more than 1 million rows in an InnoDB MySQL table. Here are the steps that I need to perform on each row: SELECT * FROM tbl where work_done=0 make some data processings ...
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1answer
9k views

High average load due to the High mysql cpu usage

i've got 2 warnings about my average load being high in the past week and apparently it has to do something with the mysql my daily visit has been increased about 10-20 thousand (total of 180-150 ...
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1answer
109 views

MySQL High I/O. Wrong configuration?

Since I switched from MyISAM to InnoDB I have a high I/O. The writes is a flat line, it seems there is a limit for them. This is my current mysql configuration: [mysqld] bind-address = 127.0.0.1 ...
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1answer
5k views

Consistent logical backup of databases that use MyISAM and InnoDB engines

I have a question regarding the logical backup of MySQL databases that use both MyISAM and InnoDB. The mysqldump utility supports these two options: --single-transaction - Creates a consistent ...
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368 views

Improve Speed of MySQL Database Import

I'm importing around 44 GB (14 million rows) of information into an InnoDB MySQL database, and I'd like to do so in a reasonable timeframe. Since I'm doing this on a personal computer, I only have 8 ...
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1answer
3k views

Finding swap causes of MySQL

In my centos 6.3 server I have a MySQL 5.5.33 database. It has 17 tables (15 InnoDB, 2 MyISAM) and total records 6.7M rows. I refactored my schemas and added indexes for my slow logs. My average query ...
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2answers
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MySQL performance impact of increasing innodb_buffer_pool_size

I have two databases one of size 170 MB and second one is of 15 MB, both having INNODB tables and innodb_buffer_pool_size is set to 8 MB. My queries are responding well now i.e under mili seconds. ...
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3answers
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Should we need to use Barriers on a production database (MySQL/InnoDB)?

Even though we are using a journaling filesystem (EXT3) with barrier enabled, is this still safer and recommended? e.g mount -o barrier=1 /dev/sda /mntpnt Reference: http://lwn.net/Articles/...
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Is it possible to optimize a range query so an explain statement would state “using index” instead of “using index condition”?

I have a very large table where specific queries made by my application are timing out. The table looks something like this: LargeTable ------------ Id [BIGINT(20)] UtcTimestamp [BIGINT(20)] Pivot [...
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179 views

Lock timeouts on a table with two keys, where only one connection writes for a given value of the first key at a time

I have a table user_rollup_message_list that is keyed by (user_id, message_reference). It is a write-heavy table, and gets enough writes that I get many lock timeouts, with a timeout of 50 seconds, ...
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Error 'Unknown table engine 'InnoDB'' on query. after restarting mysql

I have mysql DB on server S1 (mysql version 5.1.41-3ubuntu12.7-log). I have created master-slave for this DB on server S2 (mysql version 5.1.54-1ubuntu4-log). The DB on S1 was using one data file (...
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Accessing Database from Slave server

I have an application running in one server eg: My Server's Ip is 192.168.10.10, and I have the MySQL database server in the same machine. The application connects database server as localhost. ...
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1answer
156 views

Is there any way to use different InnoDB settings for different databases on the same server?

From what i know, this is not possible but i'm surprised its not highly requested feature. I'd love to be able to have one db using InnoDB in ACID compliant mode and another db on the same server used ...
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2answers
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MySQL stores BLOB in innodb buffer pool (innodb_buffer_pool_size)?

I have several databases all in INNODB, 50GB are BLOB columns, only 700MB are not BLOB data. Tools as mysqltuner ask me to set innodb_buffer_pool_size = 51GB. Does MySQL store the BLOB in RAM? If yes,...
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1answer
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MySQL innodb database creation…why do this? [closed]

I am new to administering MySQL databases but the company I work for has a number of servers set up with a physical "innoDB" schema in MySQL. Not sure why someone would do this and the schemas are ...
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1answer
627 views

Mysql DB server hits 400% CPU

I have been facing problem with my database server quite a month, Below are the observations that I see when it hits the top. - load average 40 to 50 - CPU % - 400% - idle % - 45% - wait % - 11%...
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1answer
2k views

Possibilities to speed up InnoDB INSERTs and UPDATEs

My website retains user sessions in an innodb table. This usually works well, but a few hundred times a day, the INSERT and particularly the UPDATE statements run slower. I'm monitoring when, and it ...
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1answer
183 views

What if I want to keep using MyISAM

In my current use of MyISAM the databases are extremely small and kept for a few weeks after which time they are deleted and completely rebuilt with a clean slate. The script uses MYISAM tables and ...
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3answers
9k views

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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2answers
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Indexing a reference column

Say I have a reference table like languages with only 20 records. Is it worth indexing a field like language_code (e.g. en, es) that's frequently used in queries? I'm wondering if an efficient server ...
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1answer
534 views

Why would one use the Innodb Plugin instead of the builtin Innodb in Mysql 5.1? (GPL)

Innodb works in Mysql 5.1 whether or not the innodb plugin, ha_innodb_plugin.so is loaded at startup or not. Configuration dependent of course. What are the advantages and disadvantages of either ...
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1answer
5k views

Why should I use InnoDB and MySql instead of XtraDB and MariaDB? [closed]

Why should I use InnoDB and MySql instead of XtraDB and MariaDB, except that InnoDB and Mysql happen to be installed by default on my servers? Why isn't MariaDB and XtraDB installed by default ...
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1answer
459 views

How to UPDATE a table for the level of parents in a column?

I have a table with internal parents as id parent parent_level 1 NULL 1 2 1 2 3 1 2 4 3 3 where parent has a FK to id. How can I update the table ...
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0answers
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Query getting periodically stuck in 'copying to tmp table' state, never completes

I am running Wordpress on a dedicated server with a MySQL backend. I have a query that usually takes <1 second to execute, but periodically, this query will get stuck in a 'copying to tmp table' ...
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1answer
6k views

Can I reset the ibdata1 and ib_logfile files when innodb_file_per_table is already in place

I am running into an issue where sensitive data was not encrypted properly at the application level of our production system. Even though the guilty records have been removed or corrected, scanning ...
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522 views

How to increase MySQL performance with joins

I have a MySQL database with InnoDB engine. Particularly one of my queries became very slow. The query is shown below: SELECT t1.`ARTREF1` FROM `lijnen` AS t3 INNER JOIN (`kortingen` AS t2, `...
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1answer
697 views

MySQL command querying all MyISAM database

I would appreciate if anyone could help me of what's the proper command in MySQL to query all database for having "MyISAM" engine. I need to convert all DB & tables from MyISAM to InnoDB.
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1answer
64 views

Do regular ALTERs weaken the performance?

In a project, we need to frequently ALTER the tables to delete or add columns. I wonder if this weakens the database performance in long term. If it has a considerable negative impact, what is the ...
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1answer
3k views

MySQL: sysbench test - InnoDB vs Memory tables

I've done some tests in order to investigate performance issue on the new HP Gen8 server (Intel(R) Xeon(R) CPU E5-2630 0 @ 2.30GHz) I've created two tables, first one is using InnoDB storage engine ...
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281 views

Sleeping connections

I have a dedicated MySQL server(8GB) with following configuration. [mysqld] datadir=/var/lib/mysql socket=/var/lib/mysql/mysql.sock user=mysql lower_case_table_names = 1 default-storage-engine=...