MySQL 5.5 brought many performance enhancements and expanded the feature set of the popular open-source RDBMS.

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12 views

MYSQL variable in function

Can anybody tell why the value of @URlID is always -1 even when i know the query will return a result? I have tried any possible type of variables and any possible way of inserting into the variable ...
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503 views

MySQL server: Unable to connect with root because of skip-name-resolve option

We had our MySQL server on an old server. We decided to move all of the databases to our new server. Old MySQL Server engine 5.5.31 New MySQL Server engine 5.5.38 We created one general dump file ...
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50 views

Best upgrade path for MySql 4.1 to 5.5?

Background Our production environment runs on a system that nobody wanted to update for a long period of time. With a new sherrif in town, we're going to update it. Production is MySql 4.1 with ...
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9 views

Why pages not made young is zero?

In results of Show INNODB Status showed me very weird result: Pages made young 81821279, not young 0 The official statement says: Pages made young, not young: The number of old pages that were ...
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215 views

Change MAMP to use a lower Mysql 5.1 version

I need to have the same development environment for my PHP program. My clients test server is running on Mysql 5.1 while my local is using MAMP running Mysql 5.5. How do downgrade my mysql database ...
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90 views

Too much IO to MySQL InnoDB log files

I am using MySQL version: 5.5.38 I have dedicated HDD to InnoDB log files using innodb-log-group-home-dir option. atopsar -d 30 shows big load (>50%) to this HDD The thing is that I have only 75 ...
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68 views

Soundex on a Large Table

I had a table of names, containing 200,000 rows. This has now been updated to include over 11 million rows. The table is queried using a SOUNDS LIKE 'str' and the result is then passed through ...
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22 views

Unaccounted for MySQL Processes

I am running a MySQL 5.5.38 on a VM running Ubuntu server 12.04. At certain times of the day around 12 mid day, CPU Utilization and loads spikes to over 90% with the MySQLD Process accounting for most ...
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46 views

Mysql server stops responding quickly after +- 200 connections

We have a mysql instance, 5.5.28. Its working as intended, it has during normal operations perhaps around 200 to 300 connections on it. These connections are usually "idle" waiting for something to ...
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31 views

(libmysql): (filename not available): mysql_query

Hi everybody im running a game server connected to mysql and it crashes only because of mysql connection with the error in title.. when i dont use mysql and save data as files on harddrive it dont ...
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33 views

Simple Query optimization using ORDER BY

The following is a simple query that is taking more than 10 seconds to execute: select * from inventory.asset ass where ass.product_id=83 and ass.expiry_date > now() and ass.status=1 order by ...
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91 views

problem with localhost or path on xampp instalation

I have xampp installed on my E: drive, windows 7 system the control panel works fine, both apache and mysql start normally ports for apache are 81 and 444 port for mysql is 3306 My wordpress ...
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446 views

Moving datadir OK start, but socket error for mysql client

I'm trying to move my MySQL datadir from /var/lib/mysql over to /home/mysql (an ssd drive as I'm having iowait issues on /var/lib/mysql when MySQL is running on that drive). The OS is CentOS 5.6 ...
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85 views

Altering a table to add a New Column vs Create table with New Column

I have Table A which i'm tasked to add a new column is_fully_complete bit(1), and i'm thinking: Would it be better to a.) Create a new table Table_A_new like Table_A and add the new column there ...
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121 views

Show single value of one column for multiple rows of other columns

I have a SQL query which displays my data results like this. date emp_id emp_name spent_hours 19-08-2013 1024 jack 10 19-08-2013 1024 jack 11 19-08-2013 1024 jack ...
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13 views

MYSQL Incomplete trigger

BEGIN IF (NEW.chik_updates = 'y') THEN UPDATE chik_subscriptions SET sub_additions = sub_additions + 1; ELSE UPDATE chik_subscriptions SET sub_removals = sub_removals + 1; END IF; END I have ...
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80 views

How to access another Connect server table in my Local server in SQLyog 7.01?

In same server name using same database select * from area;(Working Good) Same Servername but Different Database select * from mysql.event(Working Good) Now i am connection TWO Different server ...
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91 views

How to restore data after MySQL Upgrade?

I upgraded from MySQL 5.5 to 5.6 by uninstalling 5.5 and then installing MySQL 5.6. Now that MySQL 5.6 is running, none of my DBs or data is present/visible in MySQL Workbench. I also see that I ...
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86 views

self join of single table to find time difference of adjacent rows of a single column which are not in sequence

I want to find the time difference between two adjacent rows of a single table which are not in sequence.i made a self join of table and tried but i did not achieve what i need .can anyone please help ...
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111 views

Granting file privilage for an user on amazon RDS(MySQL)

I am having an Amazon setup for my application and I use RDS server which runs MySQL server(Not done by me.Company got it done from some freelance admin). I have a root user created in there but it ...
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1answer
437 views

Mysql closing immediately after new installation

I am using mysql as an backend for my webapp ,the software ran without any glitch but today it gave unexpectedly ERROR:2003 i tried many solution on the internet but none worked. so reinstalled the ...
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38 views

MySql Doctrine ORM DB Design for simple app

I am pretty new to Doctrine and am building a simple app and need some help with some thinking. I have: TableA - call it soccer games TableB - days of the week these games are held on TableC - times ...
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63 views

amazon small instance mysql query too slow

I have mysql database with 1.5 millions records with 2 million categories records. when i do query on categories and city where clause it takes 304989 milliseconds. on localhost it too fast. i tried ...
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55 views

change character set in mysql permanently

I want to change following parameters to utf8mb4 so that mysql can store emoji characters and special language characters. but when i try running following statements one by one SET ...
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160 views

Using a join to return multiple values of the same column?

I have two tables user Rank In the Rank table, I saved rank_id and supervisor_id. In the Rank table, I stored the rank name. The rank_id and supervisor_id are foreign keys from the Rank table. ...
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93 views

installing mysql 5.1 alongside mysql 5.5

mysql 5.5 is installed. I need 5.1 to install an old website so it can be updated. The installer refuses to let me install onto the disk with 5.5. I don't have any other disks. I downloaded the ...
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48 views

Could not access database

I have been trying to setup a local instance for a new application. I am new to MYSQL and I cannot understand how to actually connect this database to the actual web application sitting in the ...
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1answer
248 views

mysql fulltext query is very slow

I have one table for User detail in MySql with about 500000 records in it. I have also created fulltext index on firstname, lastname field on this table. but when I am trying to search any single ...
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63 views

MySQL Database Memory Consumption

i am newbie in mysql, just want to ask if what is the right formula in computing memory allocation for mysql, and how to check/query mysql memory consumption or we say where does memory consume by ...
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1answer
770 views

Setup mySQL in a chroot in Debian Wheezy

Sounds like a simple question, but the documentation is rare about what mySQL needs to run inside a chroot. I think I'm almost there, but I'm running into a permission problem that I can't solve, and ...
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119 views

MySQL 5.5, Xubuntu 14.04 - INSERT and UPDATE bottleneck

DBAs: I have been developing and maintaining plugins for Moodle for the last ~2 years, and have recently decided to try using my local desktop again, rather than my institutions ESX VMs, as a ...
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94 views

output from mysqltuner.pl (from mariadb.service)

While running mysqltuner.pl script, I'm getting following message: [OK] Currently running supported MySQL version 5.5.35-MariaDB-log [OK] Operating on 64-bit architecture -------- Storage Engine ...
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292 views

mysql service failed to start when datadir changein ubuntu

I have dual Operating system on PC, windows 8 and ubuntu 14.0, and I am mostely using ubuntu because my MySql database is hosted on ubuntu. Recently when I am trying to restore my database, which is ...
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41 views

A connection is in sleep for long time in MySQL

When I am looking in process list, three to five sleeping connections are alive. I can kill them but except one connection that is first one in above image. A user connected with information_schema ...
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17 views

Recovery database from masters

I have a multi master setup with 3 mysql nodes with Tungsten, Unfortunately replication has broke between 3 servers. Now the data is inconsistent say 100 users data is in node1, 100 users data in node ...
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77 views

tables don't exist after unmounting and remounting external drive where database was installed

I want to create a database that's too big to keep on my own machine, so I'm trying to create one on an external hard drive. It works up until I unmount and remount the drive, at which point show ...
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1answer
150 views

Select post and concatenating all categories it belongs to

I have 3 DB tables POSTS +----------+----------+----------+ | id | title | content | +----------+----------+----------+ CATEGORIES +----------+----------+ | id | title | ...
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67 views

Rails with mysql 5.5 update queries take long

app was running Rails and MySQL 5.1 and worked quite well. When we have upgrade to the new server with MySQL 5.5 some update and delete queries started to work quite long (1 sec vs 50ms on old ...
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99 views

Log-slave-updates in multi master replication using Tungsten replicator

I m setting up a system as follows with 2 masters and 2 slaves. M1 <----> M2 (Tungsten Replication) M1 ----> S1 (MySQL Replication) M1 ----> S2 (MySQL Replication) I have enabled the ...
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238 views

Create Drop Temporary Table very slow vs Truncate

I've got this stored Procedure that is called by an event that runs every 1 minute. The stored procedure selects some data from one device and puts it in a temporary table. Than it picks up other ...
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34 views

MySQL Procedure call is limiting parameters to 3 characters

I am running MySQL 5.5 using MAMP on my local machine. I have imported a database that was exported from a Windows Development environment. To get my Procs to run correctly locally, I had to change ...
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1answer
341 views

Unable to run update_mysql in MySQL 5.5

I have recently taken over managing a MySQL database running on Windows Server 2008 R2 . It is running 5.5.37 Community Edition. When it is started, it includes the following lines: Thread, Type, ...
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105 views

Upgrade from mysql 4.1 to mysql 5.5

I was going through upgrade process of mysql server. It is mentioned that to upgrade from 4.1 to 5.5 we need to upgrade step by step like first to 5.0,5.1 ...5.4 and then 5.5. I have some questions : ...
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1answer
35 views

MySQL database configuration for fastening the select and insert queries

There are several DBEngines are available for MySQL DB. Currently I'm using InnoDB. My actual problem is, I have a table that consist of millions of data. Therefore the select queries that given to ...
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11 views

Will performing a physical copy of a MySQL database on Windows to a MySQL instance on Linux still perform? [duplicate]

I'd was told you can copy text files and such from Windows to Linux just fine, I was wondering if I could copy my innodb files such as .ibd and .frm files to a mysql instance running on Linux, fire it ...
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35 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 ...
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161 views

Slow INSERT/UPDATE on InnoDB

I have a problem with the performance of my MySQL server, let me explain: I instaled a MySQL server, version 5.5.20 Server version: 5.5.20-log Source distribution SELECT queries runs fast on ...
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57 views

stress testing mysql - maximizing qps for a single user

I am running a stress test and I am trying to churn out as much qps as I can for a single user. I know this is a loaded question so I will try to be more specific. Trying to target 30,000 qps with a ...
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26 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. ...
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25 views

How to ensure accents are view as different characters when adding to unique indexes?

What can I do to ensure MySQL views the following as two different values? Bee Bée When I try to create a unique index, it fails because they're the same value. I looked at the following thread, ...