InnoDB : MySQL's ACID-compliant Storage Engine

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3
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1answer
315 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 ...
2
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2answers
444 views

Can I move the undo log outside of ibdata1 in MySQL 5.6 on an existing server?

I've been growing concerned about the large size of ibdata1 that can never shrink even when using file-per-table on innodb Moving the undo log files outside seemed logical but this procedure seems ...
1
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1answer
1k views

Aborted connection (Got an error reading communication packets) MySQL on Amazon RDS

I'm getting the following warning in MySQL: Aborted connection (Got an error reading communication packets) I'm using Amazon RDS for MySQL hosting. Both MyISAM and InnoDB storage engines are ...
1
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1answer
59 views

MySQL from table to table data transfer

I've got some problem with my MySQL. I have the database with many many data. Well, there is only one table actually with huge ammount of data, over 1 billion rows. For some reasons I need to create ...
0
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0answers
42 views

MySQL — COMMIT in 'stage/sql/init' state

MySQL 5.6 instance hosts a single database (for the TeamCity CI app). The app is quite write-heavy (about 2/3 of total database activity) and often seen waiting for database to complete a commit, ...
2
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1answer
43 views

Peer review database design for various reports

I'm currently trying to redesign a poorly thought out database for a peer review system that we use internally at my workplace. Employees can log on and submit a review about another employee who ...
-1
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1answer
69 views

Mysql Queries cause high load in server

I have problem in the database ,here is phpmyadmin status queries --------------------+ ...
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2answers
57 views

MySQL TEXT Disk Space

I have a plain text file with 3 million articles divided with \n. The file is 58G When I'm adding the articles to an InnoDB table one per row INT id TEXT article_content the .ibd file of this ...
0
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0answers
21 views

How are performances with InnoDB auto-extending data file

Our innoDB tablespace is configured like this: innodb_data_file_path = ibdata00:40G;ibdata01:40G;ibdata02:100M:autoextend If I take a look to the directory: [root@xxx innodb]$ du -hs ...
0
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1answer
152 views

forcing innodb recovery of a corrupted database

A poorly designed script selected records from two existing tables and added records to a newly created table for 24 hours until I killed it by terminating the MySQL 5.6 command line client and ...
0
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2answers
624 views

ERROR - Function 'innodb' already exists

I'm looking to start converting some MyISAM tables to INNODB. Running Ubuntu 14.04 Server with MySQL 5.6 ( apt-get upgraded from 5.5 ), 32G ram on 4 core/ 8 thread cpu. Initially had trouble with... ...
0
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0answers
112 views

Why is InnoDB waiting for table metadata lock in simple INSERT/DELETE + SELECT?

I've started using a new MySQL server and moved an InnoDB table there. I'm seeing a weird behavior that when I have a long running INSERT / DELETE, any SELECT from the same table is locked which is ...
1
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1answer
141 views

Why does IN (subquery) perform bad when = (subquery) is blazing fast?

Have a look at these two queries: Simple: mysql> SELECT * FROM omgbatch JOIN omgoutput ON (idomgbatch=omgbatch) WHERE idomgoutput = (SELECT DISTINCT lastoutput FROM omgenvelope WHERE ...
1
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1answer
194 views

InnoDB Buffer Pool Hit Rate

As given at http://cherry.world.edoors.com/COBFKUqnUdBY one can obtain buffer hit ratio by following sql query: SELECT round ((P2.variable_value / P1.variable_value),4), P2.variable_value, ...
0
votes
1answer
2k views

The InnoDB log sequence number is in the future

Our site was getting intermittent database errors and I asked my webhost to check what's happening. After some inspection they found that the database has few issues and tried repairing it. Finally I ...
0
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0answers
20 views

How can I determine the performance (rows/second) for a certain query on one of my tables?

I want to find the performance (rows/second) for an UPDATE query on one of my tables so I can adjust my WHERE clause to select an appropriate number of records. The table has around 10 million rows. ...
1
vote
1answer
87 views

LOAD DATA stuck at Null State MySQL

I'm stuck trying to move one table to another, due to columns now no longer having proper references/meaning to their column titles. In doing this, I've created a new table with the same number of ...
1
vote
1answer
153 views

How to recover from two queries stuck in kill state causing all the database to not respond? [closed]

During a INSERT INTO new_table (f1, f2, ..., fn) (SELECT f1, f2, ..., fn FROM table) I clicked the new_table in php-myadmin which ran a simple SELECT * FROM new_table LIMIT 0, 30 which ofcourse ...
0
votes
2answers
68 views

Add column on huge InnoDB table in MySQL 4.1

I need to add a column on a huge InnoDB table (200GB) which resides on MySQL 4.1.21 (SunOS). CPU has 16GB RAM and 200GB of more disk space. Is there any quick way of adding this rather than ALTER ...
5
votes
3answers
4k views

How to estimate/predict data size and index size of a table in MySQL

I am finding what is the best way to estimate size of a table for that i have studied lot of blogs and forums but unable to find any accurate answer For an example we have a table City with InnoDB ...
0
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2answers
92 views

Buffer pool above 90% utilized causes MySQL to crash

Without getting deep into the architecture and setup, is it common behavior for MySQL to act in this manner? EDIT I'm using Rolando's script to identify how full the innodb_buffer_pool is. SELECT ...
3
votes
3answers
2k views

Cannot write to mysql database while select query in process

Running Mysql 5.1.57 on InnoDB, and have a database locking issue. I have two separate sessions connected to a single database MySQL. On the first session, I run a long SELECT query (technically a ...
0
votes
1answer
199 views

Abnormally high MySQL writes and larger than normal Binary Log files. How can I determine what caused this?

We have a MySQL master database which replicates to a MySQL slave. We were experiencing issues where MySQL was showing a high number of writes (but not an increased number of queries being ran) for a ...
0
votes
1answer
78 views

Why is setting open_files_limit making MySQL slow?

We noticed that adding open_files_limit in /etc/my.cnf is making server slow. Reference : What variable(s) to look to maintain MySQL speed of scanning through all database tables while it starts?
1
vote
1answer
115 views

Why does innodb_flush_method = O_DSYNC provide such a performance boost with SAN-backed storage?

I've seen some people suggest that O_DSYNC should be used with a SAN. The MySQL docs have this to say about O_DSYNC in general: In some versions of GNU/Linux and Unix, flushing files to disk with ...
1
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1answer
32 views

InnoDB buffer pool active pages

I'd like to optimize (lower) the InnoDB buffer pool size. How can one find out how many distinct pages are active in the InnoDB buffer pool? A page could be made young twice in a while (see SHOW ...
2
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0answers
136 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, ...
1
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1answer
117 views

Optimizing a large number of INSERT … SELECT statements

I have a MySQL InnoDB database with two tables related by a foreign key. Each time a row is inserted into one it uses an INSERT ... SELECT statement from the other to get the corresponding foreign ...
0
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0answers
91 views

importing mysql data folder from an old instalation

i want to restore one database from my old mysql folder, i copied mysql/data folder from old installation into my current mysql folder, yet its not starting up any more. when i check the error_log ...
2
votes
1answer
4k 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 ...
3
votes
2answers
92 views

Is it suitable innodb_buffer_pool_size for MySQL Master-Slave

I am wondering how to decide the value of innodb_buffer_pool_size for my Master-Slave style database. I have a set of MySQL, 1 x master + 1 x slave. As I know that the innodb_buffer_pool_size is ...
0
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1answer
439 views

how to recover .ibd and .frm files in mysql

so i am developing java application with mysql 5.6.13, few days before i purchased new laptop, from previous laptop i forgot to create dump of application instead i copied folder of my database(.ibd ...
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0answers
24 views

InnoDB: detected cycle in LRU for buffer pool 0, skipping to next buffer pool

While looking through the error log for something else I noticed a couple instances of message posted as the subject. What is this about? Googling for the "error" doesn't bring much up. This is on ...
1
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1answer
124 views

InnoDB engine is not loading after tuning parameters

After installing MySQL-5.1.73, I placed default my-huge.cnf into /etc/my.cnf and started the mysql service. It was running without any issue. Now, I tunned some parameters in /etc/my.cnf file. Below ...
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1answer
57 views

How to calculate the space I need for the indexes?

CREATE TABLE info( home CHAR(10) CHARACTER SET latin1 NOT NULL, id TINYINT UNSIGNED NOT NULL, galaxy TINYINT UNSIGNED NOT NULL, galaxy_pos INT UNSIGNED NOT NULL, events TEXT NOT NULL, UNIQUE ...
0
votes
1answer
27 views

what is the best configuration for innodb_flush_log_at_trx_commit?

There are 3 different configuration is available for innodb_flush_log_at_trx_commit innodb_flush_log_at_trx_commit = 0 innodb_flush_log_at_trx_commit = 1 innodb_flush_log_at_trx_commit = 2 Which ...
1
vote
1answer
222 views

Deleting & Reclaiming space from InnoDB table

I have a 700GB InnoDB table which I'm not writing any more data to (only reading). I would like to delete the older data it holds and reclaim that disk space (as I'm running out of it). The delete ...
1
vote
1answer
204 views

Mysql 5.5 InnoDB growing CPU - Going crazy

Good morning, I'm currently facing a problem where CPU usage keeps going up until the server crash. I've tried multiple best practices proposed in this forum and on Percona, reinstalled the server ...
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0answers
24 views

Database cache problem

I have server based on Linux 64 Bit centos 6.5 and Mysql innoDB engine I created database for php script require database installation , after i successfully finished installation for first time i ...
1
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2answers
387 views

Two MySQL Server accessing same database over NFS

I want to run two separate MySQL instances on two separate machines, but using same data directory over nfs, is it possible with InnoDB Storage Engine? Application operation will assure the following: ...
0
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0answers
39 views

MySQL best practice DB recovery

I am trying to figure out what is the best practice is for Mysql recovery after a power failure. I need to find a way that if a server (which is running on a virtualbox VM) goes down when it goes ...
65
votes
8answers
48k views

What are the main differences between InnoDB and MyISAM?

What are the main differences between InnoDB and MyISAM?
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1answer
112 views

InnoDB primary key efficiency

I've read a number of articles regarding efficiency of primary keys depending on the storage engine, and I am left confused. Given a simple many-to-many table with two fields, storeId and zoneId, ...
1
vote
1answer
43 views

Adding new tables — memory usage increases

I added more tables to my mysql server. 20% increase in tables that are all innodb. I have 200 + databases that use the same schema. Does adding more tables increase memory usage? I am using about ...
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2answers
47 views

How can I store least used table files to a slower drive?

Is it possible to separate the least used and most frequently used data files on to separate disks when using InnoDB?
1
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1answer
467 views

How to decide whether to enable MySQL query cache using InnoDB

How should the decision to enable / disable the MySQL query cache be made, on a server that uses just InnoDB tables. Say for example, if the cache is enabled, then how should the output of: SHOW ...
2
votes
1answer
2k views

Why does that query cause lock wait timeouts?

From time to time, I find a lot of these errors in my PHP error log: MYSQL.1213: Deadlock found when trying to get lock; try restarting transactionSQL The problem persists for about 2 or 3 minutes. ...
0
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0answers
77 views

MariaDB Galera setup with drastically different amounts of memory used on cluster nodes - why?

We have a 3 node MariaDB Galera cluster. All nodes are identical and the config on each is identical. They have 64GB of RAM each. The output of the following query is 28: SELECT ...
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2answers
262 views

Fastest way to create local copy of live InnoDB MySQL database?

We have a MySQL database (InnoDB) on our live Ubuntu 12.04 server which has grown quite large (25gb+). Every month or so we need to copy this database to our development machines to work on locally. ...
0
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2answers
166 views

MySQL High Availability for InnoDB

I am looking for MySQL High Availability with huge transactions. I prefer to go with InnoDB Engine. I prefer to use MySQL Master - Slave Replication. However, this option provides us Manual fail over ...