MySQL : Open-Source, Relational Database Management System

learn more… | top users | synonyms

2
votes
2answers
541 views

How to monitor InnoDB Disk I/O using Server Status Variables?

This question is extension of my previous question "How to monitor InnoDB Disk I/O Required for MySQL? " As mention in my previous question i want to count total number of disk i/o per query, but ...
2
votes
1answer
2k views

Get only overall summary WITH ROLLUP and GROUP BY for multiple fields

Performing a WITH ROLLUP when grouping by multiple fields, MySQL returns a rollup row for each group, as well as the overall summary: CREATE TABLE test (name VARCHAR(50), number TINYINT); INSERT INTO ...
2
votes
1answer
1k views

How do I fix Replication event checksum verification failed while reading from network. Error_code: 1743

Our server had disk space problems. As a result, replication's IO Threads fails to start. Here are the errors in mysql error log: [Note] Slave I/O thread: connected to master ...
2
votes
3answers
135 views

What is the best way to upgrade a MySQL version in a Linux Server

What is the best way to upgrade a MySQL version in a Linux Server I have database around 14 GB running with 8 -15 GB ram(diffrent deployments) .At present MySQL version is 5.5 and I’m planning to ...
2
votes
2answers
7k views

Mysqld.exe memory usage

I am using mysql 5.6.14, For a long time i got large memory usage by mysqld.exe, i was trying many different solutions and my.ini settings to fix this up but didn't succeed, This is my config ...
2
votes
1answer
1k views

How can I make a select statement get blocked?

Hello I am trying to intentionally make a SQL select statement get blocked by another simple SQL delete or update statement, for the purpose of learning. I prefer only InnoDB tables. To prepare the ...
2
votes
3answers
367 views

Does MySQL 5.6 support fan-in replication?

I've known for quite awhile that Continuent's Tungsten Replicator supports fan-in replication (example). By fan-in replication I mean combining multiple datasources into a single instance (like a ...
2
votes
1answer
503 views

Drupal 7 Uses InnoDB, so do I need other configs?

If I'm optimizing a database that will be delivering multiple Drupal 7 websites, all using InnoDB, do I need to worry about [myisamchk] & [isamchk] sections, or can I just worry about the stuff ...
2
votes
3answers
3k views

MySQL: can not get rid of “Using filesort” in a simple query

Simple query but can not get rid of "using filesort": CREATE TABLE IF NOT EXISTS `online` ( `id` bigint(20) NOT NULL AUTO_INCREMENT, `uid` int(11) NOT NULL, `expiration` int(11) NOT NULL, ...
2
votes
2answers
492 views

EMS SQL manager permission problem

I have a strange problem with EMS SQL Manager. I'm using MySQL 5.5 with linux servers. One of my developers need to edit store procedure, so I grant him: GRANT CREATE ROUTINE, ALTER ROUTINE ON ...
2
votes
0answers
708 views

MySQL: Improve performance for one row insert into table with unique constraint

I have a table with ~ 40 mil records, with a unique index on the url collumn, of type varchar(255). Now the insert speed is about 30/s, is this expected? how could I improve it? I can't use bulk ...
2
votes
1answer
10k views

Multiple “GROUP_CONCAT”s with WHERE clause

In a table as id name type info 1 BMW car yes 2 Reno car no 3 IBM electronics no 4 Sony electronics yes 5 Mazda ...
2
votes
1answer
429 views

Restriction on self referencing on insert in MYSQL?

How to restrict insert on adding self referencing rows in a recursive relation table (a table contains foreign key points itself). mysql> SELECT * FROM Employee; ...
2
votes
2answers
3k views

MySQL / InnoDB: Does daily optimization improve performance?

Would performing daily optimizations of tables increase performance for MySQL and InnoDB? I have never did this before, but I have seen this module for Drupal http://drupal.org/project/db_maintenance, ...
2
votes
1answer
2k views

MySQL 5.5 Runs Out of Memory, Drops All Connections When Creating Many Databases

I'm running into a problem when I create a large number of databases consecutively on an Amazon RDS db.m1.large instance. The MySQL Engine Version is 5.5.23. At some point, the RDS instance drops all ...
2
votes
1answer
4k views

How to Create Snapshot Backups in MySQL

I've seen a lot of people talking about snapshots backup, even I'm reading a book about mysql but nobody explain the code how to make a snapshots backup. This is what the book says: flush tables ...
2
votes
1answer
198 views

Why does OS login not exist in the user table, but I can still login to MySQL?

mysql> select user, password, host from user; +------+----------+---------------------------------------------+ | user | password | host | ...
2
votes
2answers
1k views

Model a family tree database in Access 2007

I designed my database with the intention of implementing it with MySQL, but have now decided to implement it in Access 2007 using form and subforms. While creating my UML diagram, I realised I have ...
2
votes
2answers
176 views

Seconds Behind Master in Cloud Service

I have few mysql servers in replication master-salves in cloud service. The problem is even thought all configuration, mysql versions, server's resources are the same, still I have inconsistency in ...
2
votes
1answer
535 views

Programatically testing slave status - What fields in SHOW SLAVE STATUS indicated slave status is OK / in ERROR?

We use pingdom and a few internal heartbeat mechanisms on our product. We would like to add a 'are our slaves running and in good shape' check. What fields in SHOW SLAVE STATUS indicate that the ...
2
votes
1answer
1k views

MySql Switching Masters During Failover with log-slave-updates

I am still pretty newbie to mysql. This question is regarding promoting slave with option --log-slave-updates to become a master. The typical schema of promoting slave to master was described in ...
2
votes
2answers
715 views

MySQL Full Text index issue

I Have a table articles with following data mysql> select * from articles; +----+-----------------------+------------------------------------------+ | id | title | body ...
2
votes
1answer
3k views

mysql table very large size although it doesn't have a lot of records

I have drupal website, one of the tables is cache_form. I have a cron to DELETE FROM cache_form where expire < UNIX_TIMESTAMP(NOW()); which works fine. The size of cache_form.myd is 4.9G ...
2
votes
1answer
1k views

How to upgrade MySQL to a New version..?

I have installed mysql using the package management system.I am using ubuntu machine. After that i have very well configured the server for InnoDB and other server related parameters. I am using the ...
2
votes
3answers
2k views

How do I get % progress for “type db.sql | mysql”

I am doing: type db.sql | mysql and the console output is nothing. I see the ibdata1 file growing, but I don't know how many GB it will grow to. I would like to see a % progress indicator of some ...
1
vote
1answer
118 views

Implement a Parent-Level Count in Binary Search Tree

Based on this question, have any way to implement a parent level count? Find highest level of a hierarchical field: with vs without CTEs Example table: +----+-----------+ | id | parent_id | ...
1
vote
3answers
62 views

MySQL select with between optimization

I got issues with some geo IP query. So basically here is create code of table: CREATE TABLE `geo_ip_city` ( `id` INT(5) UNSIGNED NOT NULL AUTO_INCREMENT, `begin` BIGINT(20) NOT NULL DEFAULT ...
1
vote
1answer
5k views

Mysql got signal 11 error

6 [Note] InnoDB: Check that you do not already have another mysqld process using the same InnoDB data or log files. 2014-09-26 12:51:53 14166 [ERROR] InnoDB: Unable to lock ./ibdata1, error: 11 ...
1
vote
1answer
772 views

MySQL slave taking too long on “Queueing master event to the relay log”

I have two mysql mysql slave servers. The DB version is: mysql> show variables like '%version%'; +-------------------------+-----------------------------------------------------+ | Variable_name ...
1
vote
3answers
2k views

Master-master Replication with 3 Nodes

I need to configure mysql master/master replication with 3 nodes. Currently I have master/slave setup and I need to move it to master/master with 3 nodes. I have gone through some posts about ...
1
vote
1answer
891 views

MySQL Syntax - Searching points within polygons using GeomFromText

I am trying to select points within polygons using the GIS/spatial extensions for MySQL. I'm fairly new to this, so bear with me if this is an elementary question. I have points defined as text ...
1
vote
2answers
512 views

Freeing up disk space in 'mysql\data'

I am trying to free up some space used by a MySQL instance, but I know pretty much nothing about MySQL. I notice that in the mysql\data folder there are lots of localhost-bin.0001** files, as ...
1
vote
1answer
352 views

type recognition with MonetDB, *create* tables from CSVs

I am confused whether you can copy records into a new table in MonetDB. The official documentation seems to talk only about copying into existing tables. I have quite a large universe of billions of ...
1
vote
3answers
3k 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 ...
1
vote
2answers
293 views

mysqldump with automatically generated export name

When I do database dumps through MySQL WorkBench it picks a filename for me which is the current date (YYYMMDD). Now, I want to do this in a batch file since I want to make weekly dumps automatically ...
1
vote
2answers
203 views

Questions since MySQL Startup

Have a weird question / (bug?) here. Using PHP My Admin I installed via apt-get on Ubuntu 13.10 Versions are as follows: Server version: 5.5.35-0ubuntu0.13.10.2 - (Ubuntu) Apache/2.4.6 (Ubuntu) ...
1
vote
1answer
383 views

MySQL/MariaDB stored procedure inserts even with syntax error

createdAt has not been defined, but the query still runs when I call this proc and inserts a "0" date. Why, shouldn't it fail? DELIMITER $$ USE `MobiFit_Dev` $$ DROP PROCEDURE IF EXISTS ...
1
vote
1answer
146 views

MySQL cluster concurrency

I have a little application that executes select queries against a MySQL cluster. By using 1 thread to read a record the latency is x. By using 2 threads to read records concurrently the avg latency ...
1
vote
2answers
183 views

Get missed transactions from slave

I'm trying to write a disaster recovery plan, I have one way replication with 1 master(A) and 3 slaves(B,C,D) A /|\ / | \ B C D Let's say my master crash, and I loose all data on ...
1
vote
1answer
3k views

How to debug a db memory-leak causing mysql to go before it's own limits?

We are having a problem with one of the database server of one application, possibly caused by some code that is creating a problem in the way Mysql manage it's memory. Until the second week of ...
1
vote
1answer
1k views

Can putting mysql DB into memory or having the innodb_buffer_pool_size match the size of DB increase performance?

We have a mysql database that has roughly 80 gigabytes (GB) of data using inno_db engine. We are looking to increase performance on the database (we looked at the slow log and gone through and ...
1
vote
1answer
5k views

MySQL my.cnf Optimization

We are an email marketing company and we recently switched our setup to MySQL. We need to configure MySQL (my.cnf) for extreme performance. We have tried to configure my.cnf but heavy queries got ...
1
vote
2answers
3k views

ibdata1 grows exponentially when innodb_file_per_table is configured

I Have installed a MySQL Cluster with InnoDB (innodb_file_per_table enabled subsequently), but since I switched to innodb_file_per_table, the file ibdata1 grows (2GB at month). Is My my.cnf file is ...
1
vote
1answer
2k views

Cascading Inserts in MySql

I have a users table that has a one to one relationship to a user_preferences table (primary foreign key user_id). When a new row is added to the users table (new id added), is there a way to setup ...
1
vote
7answers
25k views

How to search whole MySQL database for a particular string

is it possible to search a whole database tables ( row and column) to find out a particular string. I am having a Database named A with about 35 tables,i need to search for the string named "hello" ...
1
vote
1answer
1k views

MySQL Point in Time Recovery For Just a Single Schema?

Is it possible to simply restore a single schema and bring it to a point in time (Say three hours ago) without bringing the entire database back? I can think of a lengthy method of backing up each ...
1
vote
2answers
3k views

“can't return a result set in the given context” error when calling stored procedure - differences between mysql 5.0 and 5.5?

I have a stored procedure to regenerate leafs (nleft, nright) in simple (id, id_parent) tree. (sample table) When I'am calling CALL EdgeListToNestedSet( 'category', 'id_category', 'id_parent'); ...
1
vote
1answer
2k views

Show processlist / Max concurrent connections seem to max out at 131

When I put my database under a load test (basically just a basic write and basic read from our app), and run show processlist; in the middle of it, there is always 131 rows in the set and that's it. ...
1
vote
1answer
609 views

What is the best and most performant MySQL cloud solution?

I'm looking for a solid solution (~1GB of DB space). Speed is crucial and I'm happy to spend up to $100 a month on a decent solution. The database will be used by a series of desktop applications ...
1
vote
1answer
117 views

How can I reinitialize some MyISAM tables without restarting MySQL?

I'm using rsync to copy some measurement data from one PC to the server. Is it possible to load the new MyISAM tables without restarting the MySQL server?