InnoDB : MySQL's ACID-compliant Storage Engine

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RDS MYSQL instance rebooted and won't load INNODB table

So my production db in RDS apparently either crashed or was rebooted during a version update, and upon being restarted mysql couldn't load one of the innodb tables: as evidenced by the following error ...
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48 views

Which is the right way to fix “Error: 1205 Lock wait timeout exceeded; try restarting transaction”

I have a PHP script that sync a local DB against external datasource. Each time the script runs I perform some triggers on the DB where INSERT or UPDATE happen. These are the the triggers for that ...
3
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104 views

Is it a waste to set innodb_buffer_pool_instances greater than the # of CPUs?

I set the innodb_buffer_pool_size to 20GB on a server with 12 CPU cores. My full database is 11gb, however most of it is archived tables that are almost never used. The total queried data is around 3 ...
3
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1k views

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' ...
3
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333 views

“InnoDB: error clustered record for sec rec not found” MySQL 5.5.28

We have a high-end server, 128GB RAM, 32 Core , Xeon, SSD RAID 10 - running Ubuntu 12.04 with MySQL 5.5.28. During high load, randomly we got the below error. MySQLcheck, innochecksum shows no ...
2
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53 views

Flexible and robust way to cull older data?

I am no DBA and that is becoming more apparent daily, as such I am having trouble keeping my query times reasonable. I have about 3.57 Million records ( at about 3.43 GB ) and it takes about 2 minutes ...
2
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63 views

Mysql Match…against query performance in InnoDB Mysql 5.6

I need to search records in the table which contains millions of records. I have recently updated Mysql version from 5.1 to 5.6. I was using like in query which was taking around 15 sec to 30 sec. ...
2
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41 views

innodb update with limit locks all matching (ignores limit)

For a query similar to this: UPDATE myinnotable1 SET value=5,updated=now(),status=1 WHERE status>10 AND message="match msg" LIMIT 1; I found that innodb engine locks ALL rows matching criteria ...
2
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35 views

See indices implicitly created for foreign key constaints in MySQL

When I add a foreign key constraint to my table, SHOW INDEX doesn't show any new indices, but the overall space used by the indices in that table increases. Apparently, the index for the field I put a ...
2
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69 views

Denormalizing to speed up inserts

I have a MySQL InnoDb table with approximately 40 million rows and the following columns: param1 (int), param2 (int), param3 (int), geo (char2), value1 (bigint), value2 (bigint) I have an ...
2
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382 views

Recover innodb database from ibdata1 and *.frm files only

I have a problem on my server. I had a hard disk error on my server, and I restarted it. After that, I started wamp server software, but mysql services were not started. I checked all mysql data, ...
2
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65 views

Count how many locks required for a MySQL (InnoDB) query

I'm performance tuning a very data-heavy mysql application. It has a purge system that often seems to cause lock timeout errors for users. Based on my research I have a few adjustments to the query to ...
2
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201 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 ...
2
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0answers
2k views

How to prevent “ibdata files do not match the log sequence number”?

I am dealing with a very large set of databases that are all innodb. I've enountered this on mysql restart too many times for my comfort: ibdata files do not match the log sequence number But I've ...
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35 views

Migrated servers… Innodb tables stayed innodb, but database is showns as MyISAM. Problem?

I moved servers. I exported DB on old, imported to new. Kept getting syntax error on import until I tried no compression. Weird, but it worked. I was skeptical so I compared the two carefully and ...
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37 views

Mariadb support rtree index on innodb soon?

I was looking through mariadb bug list online (https://mariadb.atlassian.net/secure/RapidBoard.jspa?rapidView=24&projectKey=MDEV), but I am unfamiliar with JIRA so I am not sure exactly what I am ...
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106 views

MariaDB is ignoring /etc/my.cnf

The variable I am trying to change is innodb_buffer_pool_size. As you can see below the settings is 512M. But SELECT @@innodb_buffer_pool_size; returns 134217728. When I execute: /usr/libexec/mysqld ...
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10 views

How “relatively safe” is the data which was salvaged from corrupted MySQL InnoDB database?

I encountered the corruption like the following. 150208 14:27:52 InnoDB: Error: page 443375 log sequence number 8941 870477908 InnoDB: is in the future! Current system log sequence number 5968 ...
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53 views

InnoDB Deadlocks Involving Currency Transactions

We're dealing with InnoDB deadlocks that are affecting our virtual transaction system. LATEST DETECTED DEADLOCK 150210 20:51:03 *** (1) TRANSACTION: TRANSACTION 0 4240405649, ACTIVE 0 sec, process no ...
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63 views

MySQL - Cannot add new Foreign Key

I'm using magento and it does some re-index for a product flat table structure. In this process a new table is created. The SQL for that table is something like: CREATE TABLE ...
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75 views

MySQL InnoDB Configuration with 60Gb of Memory

I'm running a large MySQL Database, in the range of 30Gb in size. The MySQL 5.5 server is running on a dedicated server with 60GB of RAM, with no other processes installed apart from monitoring tools, ...
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110 views

25.000+ rows - MySQL SELECT consecutive numbers performance issue

I have tried to be as explicit as I could. Below you have the query explained in details What I want to obtain? - I want to SELECT start_number and end_number from a set of consecutive numbers from ...
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247 views

How do I recover from MySQL InnoDB table/index corruption?

While trying to upgrade a database (in place) I got the following error. The server starts up and everything seems to be fine, except that the table mentioned in the message is no longer accessible. ...
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22 views

Need advice on optimizing database on a recurring basis

I have a search engine with approx 3.5 million rows in the searchable table. There are many suppliers that feed into the table each day, so primary keys are constantly being removed and added and the ...
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43 views

Can't seem to optimize joined select query

Can't seem to figure this one out. Query is taking upwards of 7-8 seconds which is just not acceptable and seems as though it will get worse as the table(s) get larger. Without going into a ton of ...
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20 views

Conversion to Barracuda/Compressed Rows Doesn't Free Disk Space

I'm currently converting large tables to the Barracuda file format. We are using file_per_table. I had one table that decreased from 4.3gb in size down to 1.8gb and we're very happy about this. ...
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127 views

mysqldump with --single-transaction seems to be “fixing” InnoDB tables with page corruption - why?

I'm trying to find out what exactly is happening here. I've been intentionally corrupting index pages in InnoDB tables, changing bytes in user record areas that actually contain information (largest ...
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528 views

How to generate data for News Feed efficiently like facebook , googleplus , twitter e.t.c?

I have created table as post ( post_id int(15) auto_increment primary key , user_id int(11) , post_text varchar(2000) , post_type int(1), ...
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486 views

using Aria vs InnoDB vs MyISAM

I was wondering (if anyone knows) if Aria database is crash safe . I had some tables with MyISAM which were getting corrupted very often and switch them to InnoDB . However innodb is a bit slower and ...
1
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63 views

Move all InnoDB databases into one subdirectory (innodb_file_per_table is ON)

First of all, excuse my English. I want to run a MySQL 5.6 on ZFS volume, and need to move all InnoDB databases to one subdirectory (which in fact will be a different ZFS filesystem). For example, by ...
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179 views

What do spikes in InnoDB lock structures indicate?

I co-maintain a high traffic site similar to StackExchange. It runs MySQL 5.1 (working on replacing it with MySQL 5.5 or MariaDB). All our tables are InnoDB. MySQL goes down a couple of times a day. ...
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195 views

MariaDB Galera Cluster

I have two mariadb servers in cluster that is working galera and xtradb. it is my primary server configuration: [mysqld] datadir=/var/lib/mysql query_cache_size=0 binlog_format=ROW ...
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52 views

Does union all have an enforced ordering

I know that a union does a de-duplication so can jumble the results, but I can't find a definitive answer for union all Example query select id from ( select id from table where id = 1 union all ...
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53 views

“Binlog has bad magic number” - recoverying InnoDB tables

A system crash raised the error in the title. I've tried the suggestion here, but then I can't access any of my InnoDB tables. They are still there, but data is missing. The provided solution ...
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291 views

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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894 views

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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56 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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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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671 views

Incorrect information in .frm file after a power outage?

CentOS release 6.3 (Final) x86_64 mysql Ver 14.14 Distrib 5.5.31, for Linux (x86_64) using readline 5.1 SHOW SLAVE STATUS\G: Slave_IO_Running: Yes Slave_SQL_Running: No ...
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0answers
565 views

MySQL InnoDB slow inserts

I'm currently struggling with an MySQL Community Server 5.5.27 when inserting large numbers of rows into a table. We're running a 24 core Intel Xeon machine with an SSD software raid array. I did some ...
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103 views

Any drawback to lots of creating and renaming tables at InnoDB?

I'm trying to optimize an important cronjob for my program, and what it basically does is generate a long list of user ids with their score points. I have a table called user_ranks and it will bulk ...
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0answers
1k views

Tables don't exist after MySQL restart

I recently made changes to optimize performance for InnoDB engine-based DB and soon after when restarting I encounter into the following strange behavior: I have some tables with data in them I made ...
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0answers
814 views

Why can I not start mysql server on ubuntu after change the innodb_flush_log_at_trx_commit value to be 2?

Why can I not start mysql server on ubuntu after change the innodb_flush_log_at_trx_commit value to be 2 ? updated to answer the 3 questions: mysql> show variables like 'version%'; ...
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27 views

Tuning MySQL with InnoDB engine for my application

I've read through a lot of answers, and I realize this is mostly application specific, so I wanted to give some background as to what I'm doing with the database and hopefully get some tips on tuning ...
0
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0answers
35 views

MariaDB error on alter table - table removed - constraint name is blocked

Today, we experienced a strange behavior in 5.5.41-MariaDB (InnoDB): An ALTER TABLE (add constraint) statement failed with error (mysql server has gone away after that). Then the database table ...
0
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0answers
22 views

Partial restore of InnoDB from snapshot

We currently run a mix of MyISAM and InnoDB tables on an older version of MySQL. ZFS is used as the filesystem which allows us to take instant snapshots of mysql data. One useful case for this has ...
0
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0answers
13 views

Dropping a corrupt table in innodb_force_recovery 6

As often happens in mysterious shutdowns during large queries, things ran afowl with InnoDB on my XAMPP MySQL installation (Windows 7 x64). I rebooted and ran Startup Repair, then loaded MySQL to ...
0
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24 views

Should innodb_buffer_pool_size be much larger than the innodb_buffer_pool_bytes_data?

Our old server had 32GB total RAM, 18GB allocated to innodb_buffer_pool_size. It also had 10GB for the php_memory_limit. The new one had 16GB RAM, 9GB for innodb, 5GB for php. The same application ...
0
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0answers
38 views

Index pages in innodb file when innodb_file_per_table = ON

I have MySQL 5.5, and innodb_file_per_table was always in config file. After some time of using MySQL DB was produced big ibdata1 file, but i don't know how explain why this file is so big, i try to ...
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16 views

InnodDB - is a long running SELECT query when command is “Creating Sort Index” a likely cause of “Lock wait timeout exceeded”

I'm having recurring problems with lock wait timeout errors. These persist and build up until the database drops connections with "Too many connections". It has so far happened when I have been away ...