InnoDB : MySQL's ACID-compliant Storage Engine

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3
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1answer
939 views

InnoDB “corruption”

I use: 5.1.63-0ubuntu0.11.10.1 Apache/2.2.20 (Ubuntu) MySQL client version: 5.1.63 The system is continuously displaying the following error during reading data from a MySQL database: ...
4
votes
1answer
367 views

How badly does innodb fragment in the face of somewhat out-of-order insertions?

Let's say there's a composite primary key on (field1, field2) Also, let be X a theoretical set of n numbers Inserts look like this: INSERT INTO table(field1, field2) VALUES([a number picked at ...
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2answers
187 views

What MySQL storage engine should I choose?

I have a database for my catalog webpage. Some tables are about 3GB with millions of rows. What engine should I choose for my database, InnoDB or MyISAM? There will only be about 1,000 new records ...
2
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1answer
1k views

ERROR 1005 (HY000): Can't create table 'phact_greenland.cache' (errno: 121)

I get an error when I try to create a table: ERROR 1005 (HY000): Can't create table 'phact_greenland.cache' (errno: 121) CREATE TABLE IF NOT EXISTS `cache` ( `cid` varchar(255) NOT NULL ...
10
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3answers
1k views

Where is the INNODB Performance Leak?

I have a weird problem which I cannot seem to fix. I'm more an web programmer than a Server/DB Admin, so I hope someone here can help me. The Situation I am working on a system which handles a lot ...
7
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2answers
2k views

MySQL : perform a big data migration between tables

I want to migrate data between 2 InnoDB tables. Currently I'm running this query: INSERT INTO table_a SELECT * FROM table_b; If the dataset grows, what's the best way to avoid CPU overload? ...
4
votes
2answers
9k views

How do I get the current and next greater value in one select?

I have a InnoDB table 'idtimes' (MySQL 5.0.22-log) with columns `id` int(11) NOT NULL, `time` int(20) NOT NULL, [...] with a compound unique key UNIQUE KEY `id_time` (`id`,`time`) so there can ...
5
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2answers
15k views

innodb_flush_method=O_DIRECT vs O_DSYNC performance impact on ext3 with LVM disk partition

In one of my production environment, we have two instances running on a RedHat cluster, with one production instance associated with the cluster. We have 125G main memory with 24G InnoDB buffer pool ...
2
votes
2answers
3k views

MySQL 5.1.63 - using tuning-primer - Table Cache question

tuning_primer says the following: TABLE CACHE Current table_open_cache = 812 tables Current table_definition_cache = 256 tables You have a total of 498 tables You have 812 open tables. Current ...
13
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2answers
4k views

Is the overhead of frequent query cache invalidation ever worth it?

I'm currently working on a MySQL database where we are seeing a large number of invalidations from the query cache, primarily because of the high number of INSERT, DELETE and UPDATE statements that ...
1
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1answer
1k views

How to change the display of an empty string in mysql command line tool?

I'm maintaining a database with InnoDB tables. These tables have some columns of type (from show create table): `val0` varchar(30) default NULL, `val1` varchar(30) default NULL, etc... From the ...
1
vote
1answer
109 views

Select ``,* from table?

I'm trying to upgrade our database servers to MySQL 5.5. In doing so, I'd like to convert all of our tables to InnoDB to take advantage of several performance benefits. However, we use VARCHAR(50) ...
4
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2answers
1k views

Could running ANALYZE on all databases on large InnoDB tables show some performance increase?

So we have an old database that was fragmented until we ran OPTIMIZE on all tables. The database/tables are about 100GB in size. Tables are InnoDB with heavy read/write activity. There are so many ...
3
votes
1answer
8k views

innodb_force_recovery when InnoDB corruption

When I start mysqld (in /etc/init.d), it failed with InnoDB: corruption in the InnoDB tablespace. What's the best innodb_force_recovery value to force mysqld to start? I have tried 4 and 6, but ...
1
vote
2answers
611 views

Simple queries taking ages to run after changing from MyISAM to InnoDB

I have a quite large (300GB) table on MyISAM, which I've "converted" to InnoDB, and performance for a specific query has dropped through the floor. When I say "converted", I can't afford to take the ...
1
vote
1answer
844 views

Removing/overwriting sensitive data located in already deleted records in ibdata files

As far as I know, using InnoDB tables with innodb_file_per_table = off does not prevent deleted data from being visible in the ibdata1 file. I know this is by-design, and that I could switch the ...
3
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2answers
447 views

MySQL InnoDB Index in swap

I can't find any info regarding my question. This is more theoretical question. For example, i have table keywords. CREATE TABLE IF NOT EXISTS `keywords` ( `kid` int(11) unsigned NOT NULL ...
4
votes
1answer
8k views

How To Optimize and Repair InnoDB tables? ALTER and OPTIMIZE table failed

I just switched my Wordpress databases to use the InnoDB engine. When using MyISAM, I used to run Optimize and Repair table. However, with InnoDB, these don't work. I manually ran OPTIMIZE TABLE ...
4
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1answer
2k views

Proper tuning for 30GB InnoDB table on server with 48GB RAM

I have a 30GB 15M rows InnoDB MySQL 5.5.15 table. It is running on a server with many other MyISAM tables (300GB db). The system has 48GB RAM. Besides the default configurations, I've changed the ...
2
votes
1answer
407 views

MySQL table locks solution -> InnoDb / Partitions

I'm experiencing many table locks in a MyISAM MySQL table that is pretty big (Constx10xGB and 15M rows). It's mainly caused due many heavy inserts. My current thoughts to optimize: Changing to ...
0
votes
1answer
2k views

Unable to select the records from specific partition in mysql?

I've created a table using the following query, CREATE TABLE employees ( id INT NOT NULL AUTO_INCREMENT PRIMARY KEY, fname VARCHAR(25) NOT NULL, lname VARCHAR(25) NOT NULL, store_id ...
0
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1answer
2k views

MySQL Innodb: What is the difference between running 'mysqlcheck --optimize --all-database' compared to running 'optimize table' in the mysql client?

Without having to script an 'optimize table' query to do all the databases/tables, we would like to run mysqlcheck --optimize --all-database instead. What are the drawbacks of doing this through ...
1
vote
1answer
227 views

Data storage in innodb

I am new to mysql administration and I came to know about the data storage in myisam is through .frm, .myd and .myi. I could not find the data storage mechanism in InnoDB rather than its storage in ...
3
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1answer
7k views

Amazon RDS MySQL 5.5 Innodb Lock wait timeout exceeded

Ever since we've moved to Amazon RDS, we've had some pretty crazy performance issues, and today we started having locking issues. Because of that, I figured it was just a timeout issue, and went to ...
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1answer
161 views

Optimizing table and choosing storage engine

Having the follow MyISAM table: +----------------------+-----------------------+------+-----+---------+-------+ | Field | Type | Null | Key | Default | Extra | ...
3
votes
1answer
756 views

Fastest way to copy data from MyISAM to InnoDB

I want to copy all data from a MyISAM table with 16 millions rows to a InnoDB table, that will have a different (optimized) schema. See tables below to see the changes. However, every approach I try ...
7
votes
1answer
5k views

When to switch from MyISAM to InnoDB?

We have a MySQL 5.0 server running all tables as MyISAM. We have two slaves that, in the last month, we have upgraded to MySQL 5.5. Their tables are also still MyISAM. My original plan was to upgrade ...
4
votes
3answers
4k views

Mysql backup strategies?

We have a innodb mysql database so we are lost with lots of different mysql backup strategies. Some talk about mysqldump some talk about third part tools. Some of the tables we also plan to run ...
3
votes
1answer
2k views

Optimizing MySQL for Read-Only?

We have 14 GB worth of CSV's which total 138 million rows. I imported this into a MySQL table first with InnoDB, and then tried again with MyISAM. In both cases, a simple SELECT on primary key ...
6
votes
1answer
1k views

Can I have an InnoDB master and MyISAM slaves with Full-Text for searching?

I'd like to use InnoDB on the master, for its transactional ability, but MyISAM on the slaves for the full-text search ability. Is this possible?
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2answers
2k views

Similar function NOWAIT in MySQL

Select for update nowait doesn't work in MySQL 5x (innodb). Is there any function like NOWAIT in MySQL?
3
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1answer
4k views

error 1118: row size too large. utf8 innodb

I have tried to find a solution guys, and I am guessing that someone has met this before. But I cannot get hits down below 5000... most of which don't match my question. Using MySQL 5.6 - windows ...
3
votes
1answer
977 views

How do you extend the tablespace when using innodb_file_per_table?

With innodb_file_per_table off, you can create multiple tablespaces on multiple devices if necessary to manage growth, balance I/O, etc. With the option on, how do you control growth of the files? Do ...
0
votes
1answer
734 views

InnoDB - Use combined index with primary key on GROUP BY

As far as I know, an InnoDB index always contains the primary index. I cannot get the following to work: SELECT t1.a FROM table_1 t1 LEFT JOIN table_2 t2 on t1.id = t2.refid WHERE t1.b = 99 GROUP ...
2
votes
1answer
6k views

Enabling InnoDB on an existing MySQL production server

We have a MySQL 5.1.59 server that has 30-40 existing MyISAM databases. I need to deploy an application that requires InnoDB databases. Can I just enable/configure InnoDB in /etc/my.cnf and restart ...
3
votes
1answer
3k views

Slow insert performance in mysql innodb table for solr indexing

I have a Slave server (MySQL 5.5) having innodb tables. This server is being used for SOLR indexing. Few procedures used to fill 12 million data into 9 tables. The insertion speed is too slow. ...
3
votes
2answers
61 views

Should I put followers_no & following_no & product_no & last_login and etc in the user table? Won't updates cause fragmentation on the table?

I have a table for users in a social networking site. I want it to be efficient from ground up. If I put mentioned fields on the table then I have to update user's table on each changes. Should I have ...
3
votes
1answer
3k views

PostgreSQL 9.1 vs MySQL 5.6 with InnoDB ? Which is better for scaling?

PostgreSQL 9.1 vs MySQL 5.6 with InnoDB. I do know that PostgreSQL offers better SQL features. I am currently using MySQL 5.6 lab release (the one with InnoDb full text search feature)(not in ...
2
votes
1answer
948 views

Mysql: Tell InnoDB to keep a specific table or database out of pool/cache?

I have some tables that are used primarily to keep historical data, or that are only used once a day. I do not want any operations on these tables to disrupt the more important tables present in ...
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2answers
1k views

Warnings: Why are statements with limit clause unsafe even if there isn't a limit?

I'm a bit irritated because of some warnings in mysql errorlog. Example 1: [Warning] Unsafe statement written to the binary log using statement format since BINLOG_FORMAT = STATEMENT. The statement ...
2
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2answers
2k views

Deleting Entries from Table not reducing my DB file

Iam usind INNODB Engine with innodb_table_per_file , so every table has it's own .ibd file instead of ibdata1 file. When i Entered 512 Record in my users table its size get increased to 200kb from 96 ...
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vote
2answers
1k views

How can I optimize this mySQL table that will need to hold 5+ million rows?

The table has about 12 rows. Indexes: idint(11), Unique, auto-increment, primary ATTACHMENTIDvarchar(14), Unique MLSNUMBERbigint(20) POSITIONint(10) FILETYPEvarchar(32) I'm doing an extended ...
2
votes
1answer
125 views

why/how does the number of matched columns influences the way of excecuting a query

Imagine the following situation: Table A uses MyISAM and contains 4 fields (text) with a combined FULLTEXT-index. FULLTEXT fulltext1 | fulltext2 | fulltext3 | fulltext4 Table B uses InnoDB and ...
2
votes
1answer
686 views

Database Design - Creating Multiple databases to avoid the headache of limit on table size

I need to design database to store information contained in millions of log files generated by devices on trial on network. My first approach was storing all the information in tables contained in a ...
6
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1answer
4k views

Why is DELETE so much slower than SELECT, then DELETE by id?

I have a fairly busy InnoDB table (200,000 rows, I guess something like tens of queries per second). Due to a bug I got 14 rows with (the same) invalid email addresses in them and wanted to delete ...
4
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2answers
1k views

How to copy a MySQL database which is a mixture of InnoDB and MyISAM to the same server?

Because mysqldump takes forever, we decided to just move around the files. Because the 2 databases are on the same server, a cp will be fast. The problem is, from research, MyISAM is okay with being ...
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2answers
655 views

MySQL: reducing ibdata file size for MyISAM tables

My Question is actually very similar to this one and also includes a good answer for a case with InnoDB Engine tables: Is there any best way to reduce the size of ibdata in mysql.?, I have noticed ...
5
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3answers
6k views

Maximum table size for MySQL database server running on Windows (NTFS) Table type InnoDB

I need to design database to store information contained in millions of log files generated by devices on trial on network. I have designed 5 different tables to store log file information. But, as ...
2
votes
2answers
4k views

Need suggestions for best way to archive MySQL (InnoDB) tables

Problem: I have two fairly large tables. A 'wall' table for messages between users with 9 million rows at 2 GB and a 'chapter' table at 2 million rows and 18 GB. I want to keep the number of active ...
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3answers
14k views

How to get the most out of MySQL on a QuadCore machine with 16 GB of RAM?

I'm running a MySQL 5.5 server on my workstation for scientific data analysis and wonder how to configure MySQL in order to get the most out of it performance-wise. The types of query that I typically ...