InnoDB : MySQL's ACID-compliant Storage Engine

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Drupal database doesn't work after MySQL restart

I've installed Drupal 7x on my local XAMPP 1.8.3 Server. Everything went fine but after adding some modules, changing the drupal theme and restarting the MySQL Server, the MySQL Server is dropping ...
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2answers
2k views

Partitioning a table will boost the performance?

I have a very large table approx 28GB and that is continually increasing. I am thinking about partitioning my table. The table is InnoDB and The File Per Table is enabled I have a field name ...
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1answer
304 views

MyISAM vs InnoDB for Forums [closed]

I want to design a forum script with MySql. Which database engine would have better performance? MyISAM or InnoDB ?
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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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2answers
3k 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
335 views

Deadlock from mysqldump --single-transaction, is it possible?

Is it possible to get a deadlock if you ran mysqldump with the argument --single-transaction ? or any other complication ? If it is used to backup a live site with many other querys running at the ...
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0answers
501 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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2answers
12k views

MySQL 5.1 InnoDB Configuration / 24GB RAM - bi-xeon high load

i'm running a facebook app which currently has 300 - 600 concurrent users (and growing). To get the hardware ready for growing i changed my i7 / 12gb ram / 2x 80gb intel x25 ssd's (debian 5.0 / mysql ...
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1answer
428 views

MySQL Performance Issues

Over the past 3 weeks we have been having bottle-necking issues at our MySQL server. I have been using MonYOG to watch the processlist in an attempt to get a grasp on the issues. We are aware that ...
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1answer
2k views

Recover the disk space after deleting rows from table

I deleted millions of rows from one of the table with innodb engine. I know that I need to run optimize table to recover the space. But running that will cause lock on the table, which will affect the ...
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1answer
97 views

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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2answers
523 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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2answers
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Dynamic change to innodb_flush_log_at_trx_commit

This is related to this question. It does help to get better performance for InnoDB tables. According to MySQL manual, innodb_flush_log_at_trx_commit is a global dynamic variable. Thus, I can change ...
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1answer
2k views

MySQL database drop insanely slow

I just installed MySQL 5.0.45-log Source distribution on my Debian 6.0.6 server. I installed it under my user home directory like I'm used to doing. But this time the queries are extremely slow to ...
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1answer
2k views

What happens if the mysql database's innodb log files are lost?

What I did was /etc/init.d/mysql stop then removed the files: ib_logfile0, ib_logfile1 then modified my.cnf file, variable: innodb_log_file_size and then: /etc/init.d/mysql start and allowed ...
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2answers
799 views

How do I determine how much data is being written per day through insert, update and delete operations?

The longevity of SSDs is largely determined by the amount of bytes written by insert, update and delete operations. What is the best way to accurately determine how much data is being written by ...
2
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1answer
102 views

Why isn't the rows of an EXPLAIN accurate?

I have the following table: mysql> select count(*) from employees; +----------+ | count(*) | +----------+ | 10000 | +----------+ 1 row in set (0.03 sec) I do an EXPLAIN: ...
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2answers
2k views

Where should I look for my.cnf?

I want to add innodb_file_per_table statement to my.cnf file. Where is my.cnf? Could I change this file when I have an online site?
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1answer
415 views

Converting a large SQL Server database to MySQL. Database corruption? Can't access data after transferring [closed]

I have gigabytes of tabular data stored in a SQL Server database. I've been trying to migrate it to MySQL using the Migration Toolkit from Oracle. I didn't have any mapping errors and fixed all the ...
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2answers
4k views

MySQL 5.5 High CPU Usage

I have been working with a client with high traffic website(500k visitors and 600-800 active users at any given time). This uses wordpress and the DB is using MyISAM engine. The problem we had was ...
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0answers
92 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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1answer
320 views

TokuDB database size unknown in phpmyadmin

In mysql server, I installed the TokuDB storage engine. I converted database engine InnoDB to TokuDB, but my table sizes show unknown in phpmyadmin.
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1answer
2k views

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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2answers
303 views

Can I use a foreign key index as a shortcut to getting a row count in an INNODB table?

I have a table that has a large number of rows in it. The primary key (an auto-incrementing integer) is, by default, indexed. While waiting for a row count to be returned I did an EXPLAIN in another ...
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2answers
2k views

“freeing items” taking forever on inserts, updates and deletes

Recently I migrated all my MySQL database tables from MyISAM engine to InnoDB. I'm using the DotCloud MySQL service as my server (http://docs.dotcloud.com/services/mysql/). After the migration, ...
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1answer
93 views

Increased server load after InnoDB deadlock

I am using InnoDB instead of MyISAM for a couple of months right now, and it has really optimized my game database-wise. I was aware of the danger of deadlocks, but hadn't had any problems with it, ...
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2answers
2k views

How to optimize MySQL for large BLOB updates

I have a table that holds large BLOBs (up to 10M), and is updated frequently. The problem is that UPDATE statements can take up to 1 second to execute, and due to app design this blocks UI. I need to ...
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1answer
1k views

InnoDB: Error: pthread_create returned 12

have installed MySQL in a particular folder. I was able to run the server and create accounts, databases etc. However, now whenever I try to start the server, I get an error: $ mysqld_safe ...
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515 views

Insert Speeds for large batches

In my application, my INSERTs seem to be taking a major chunk of the time. I have a large number of objects in memory (~40-50,000) which i want to insert into a table. Lets take a sample table ...
2
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1answer
92 views

Why is it slower to access records at the end of the database?

I have a mysql innodb database running with some 200k records, and I'm having some unexpected slowdown when accessing records near the end of the database. Specifically, it is taking .10 seconds to ...
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2answers
324 views

Is there slowdown inserting into an InnoDB table that has no index set?

I have an old application with lots of InnoDB tables, that have no indexes at all, not even a primary ID or such. Those tables only contain a few thousand rows. Would it be faster to INSERT data ...
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1answer
1k views

Tuning dedicated Percona Server with XtraDB for OLTP

Hardware specs for an OLTP DB dual quad core xeon with hyperthreading 24GB ram Hardware RAID10 BBU Software specs Standard install of Ubuntu 10.04LTS with default LVM partitioning Installed ...
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1answer
521 views

How to convert innodb engine tables to tokudb engine

Hi I want to migarate my server newly installed tokudb engine. i want to convert each table of database from innodb to tokudb. How can I do that using sed command ?
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3answers
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Transaction Rollback on DROP DATABASE

Does MySQL use transactions for DROP DATABASE... statement (all tables use InnoDB engine)? Basically I would like to know if any data will be lost if I kill DROP DATABASE... query while it's running? ...
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2answers
203 views

Specific disadvantages to storing infrequently accessed large files in a large database

I have heard many times across the web that it is, for various reasons, a bad idea to store files directly in a database, the preferred method being to store filenames in the database, and files ...
2
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1answer
316 views

InnoDB, Hash Table, Reference Table and Fragmentation

I have a big list of domains and URLs that I store in a database, there are around 150M domains and 300M URLs, I'm using InnoDB to store each in the format: CREATE TABLE IF NOT EXISTS `domains_list` ...
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2answers
1k views

Remove InnoDB files (ibdata1 and iblog files) after migration to MyISAM

I changed the only two InnoDB tables on a replication slave to MyISAM, so the slave now only has MyISAM tables. Can I now remove the ibdata1 file completely?
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2answers
1k views

SHOW TABLE STATUS very slow on InnoDB

Recently we've been migrating from MyISAM to InnoDB and I understand that MyISAM uses meta information against each table to track information and such - however, the database is about 1.8gb with 1+ ...
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1answer
89 views

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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5answers
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MySQL said “InnoDB: Initializing buffer pool, size = 128.0M”, does it mean it is using 128MB RAM?

I am just using a very few InnoDB tables (e.g. less than 1MB), but during MySQL startup, it said InnoDB: Initializing buffer pool, size = 128.0M Does it mean even I am using in such a small size, ...
2
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1answer
6k views

MySQL: Row size too large (> 8126)

Here's the issue. I have a table which has 300 columns in it, each up to 255 bytes (there IS a business justification for this). When I try it create it using VARCHAR(255), I go past the limit for ...
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1answer
7k views

increasing mysql table open cache?

I often read that it is best to increase this variable slowly. Can someone explain why? My status indicates that I should increase it... What is best practice / "slowly"? Thanks!
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1answer
164 views

Query mysql database through memcache

I have been trying to use memcache with MySQL 5.6 but I can not figure out how to do this. I have add an entry into innodb_memcache.containers so I can query the database through memcache. What I ...
2
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1answer
309 views

select count(*) in mysql 5.5 innodb— rewrite advice?

I need advice on how to rewrite a select count(*) query for innodb tables mysql 5.5. in new environment its very slow... select count(*) from mails3 join questions using (question_id) where ...
2
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1answer
367 views

List of variable defaults for InnoDB engine

I would like to list the defaults for the global variables that are innodb specific. The problem is that the following commands doesn't list any innodb variables: /usr/sbin/mysqld --no-defaults ...
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1answer
92 views

InnoDB query duration inconsistent

I am running a series of UPDATE commands on a nearly empty InnoDB table, and around 1 out of every 20-30 queries will inexplicably take 10 times as long as the others. For example, the first 20 ...
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2answers
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innodb_file_format Barracuda

I have a couple questions for those more familiar. Most of my instances have been running Antelope despite having support for Barracuda. I was looking to play around with some compresses innodb ...
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1answer
273 views

Information about Disk Storage MySQL

I am trying to create an application for monitoring MySQL,in my application there's a part of monitor DISK STORAGE, so after more research I have not found how to calculate : used and free size of ...
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1answer
860 views

What is log sequence number ? How it is used in MySQL?

Can anybody give an example or scenario of log sequence number(LSN) used in MySQL
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1answer
15k views

Mysql Innodb: InnoDB: ERROR: the age of the last checkpoint is InnoDB: which exceeds the log group capacity

I really need some mysql expertize. I am a newbi to mysql and I am seeing some server crash of my db in the past 1 week. I am using mysql 5.1.36 on Ubuntu. This is a dedicated mysql server with Dual ...