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

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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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62 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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632 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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110 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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89 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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279 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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36 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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16 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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67 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
121 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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64 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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95 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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206 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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32 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
299 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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91 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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34 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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32 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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136 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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54 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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23 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, ...
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14 views

How to recover from a corrupt relay file on a slave?

I recently had a master shutdown on its own. In this case, the slaves all recovered fine. However, I starting thinking about how to recover if the master shuts down and for some reason the relay log ...
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27 views

How to return nothing but the number of rows and execution time?

I'm trying grab the # of returned rows and execution time rather than the actual records. Or,at the very least discard the results. Any tricks to do this? I could use outfile or SP and then parse it, ...
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121 views

How to decrease load time by chunking large file using Percona pt-fifo-split?

I'm loading data into a fresh instance which takes ~48s to load a single file (1G; 2.5m rows). To decrease load time, I tried chunking it into 100k rows using Percona's pt-fifo-split. Unfortunately, ...
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20 views

How is the key length determine in an index?

Aside from explicitly setting the key length when creating an index, how does MySQL determine the appropriate key len shown when running "explain"? Thanks
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12 views

Is there any value in adding a pk column to an composite index? [duplicate]

I recently inherited a database with indexes that contain the table's primary key as part of some composite indexes. Given MySQL adds a hidden column representing the PK regardless of whether you ...
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226 views

#2002 Cannot log in to the MySQL server / Connection for controluser as defined in your configuration failed

I use PHP/MySQL in Ubuntu 13. To reduce the size of ibdata1, i followed this post What is the best way to reduce the size of ibdata in mysql? and make necessary changes as told in the answer. I did ...
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27 views

How to acheive Concurrency in mysql when there is 500+ request simultaneously to the server

I am using Mysql (InnoDb), in this I am facing problem when we checked the curl request upto 500 connection at a time (simultaneously) but when we try more than that then my servers goes to idle ...
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2answers
529 views

How can I execute multiple statements at once in MySQL Workbench?

I'm trying to execute multiple LOAD DATA INFILE statements at once using MySQL Workbench. However, they execute one at a time. Anyway of forcing them to run in parallel? Thanks for the help!
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286 views

update variable from multiple tables in one row

I have two databases, and I need to UPDATE variable 'birthday' from one row to another checking 'name' (from db1 to db2). The problem is, that 'name' variable in second db is located in another table ...
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67 views

How to update Status using IF Condition in Mysql trigger

I'm trying to write an update trigger that will Design_Update_Status to Customized when a date is entered in Custom_Design_Update_Date field and if nothing is entered that field it should update ...
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3answers
195 views

How to autoincrement Prod_id based on Product_Name using trigger in mysql

Product_Details table : (Fields) Prod_id(Primary key), Product_Name, Prefix and Slno(Auto incremented) i need to increment Prod_Id based on the product name field and prefix field (Input will be ...
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1answer
125 views

mysqldump 5.5.25 use swap instead of memory

mysql version 5.5.25, while use mysqldump to dump big tables, it eat lots of swap while there is lots of free memory. # free -m total used free shared buffers ...
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26 views

MySQL: Archival How to?

I would like to know the correct Archival Strategy for my DB Schema. We are using Mysql 5.5. Here is the full scenario: We have around 35 tables in DB out of which 10 would be transactional in ...
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1answer
251 views

XML dump of MySQL database don't include foreign key constraints. What can be the reason? sqldump(.sql) file list it

I am accessing schema information of databases in XML format. I am taking dump of the database in XML format using the command below. mysqldump --no-data --xml -u root -p bakerydb > bakerydb.xml ...
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89 views

Is this a normal query time for a left outer join type?

I have Employee Table - 80K records about 100 fields I have an app table - 8K records and 30 fields Then a subset of employee table also stored as table that has our divisions subset - call this ...
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2answers
64 views

Mysql replication from existing slave to new slave

I'm hoping you experts can help advise me, I've got this topology: Live DB(Master) ----> Backup Server (Master and slave) ----> Test DB Backup server is a slave of Live DB, and Test DB is a slave of ...
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89 views

Mysql query getting hung!

I am using mysql 5.5. I create following temporary table: CREATE TEMPORARY TABLE IF NOT EXISTS tempdb.%s ( `count` int(10) NOT NULL, `m_class` enum('SMS','EMAIL') NOT NULL, ...
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1answer
100 views

Slow MYSQL performance due to sub queries

Here is my query: SELECT BAL,NAME, (SELECT SUM(DR) FROM transaction WHERE NAME=TNAME AND DATE < '2000-05-01') AS DR , (SELECT SUM(CR) FROM transaction WHERE NAME=TNAME AND DATE < ...
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1answer
84 views

Annonymous user has no privileges, but still able to show databases?

Output of SHOW GRANTS FOR ''@'localhost'; GRANT USAGE ON *.* TO ''@'localhost' However, when I log in using my default user account, which is later defaulted to an annonymous account by mySQL as ...
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240 views

Alternative to TEMPORARY tables capable of re-opening in a query?

I use TEMPORARY table for calculation of temporary data, but TEMPORARY tables in mysql has a big limitation, which made it useless for me. A table cannot be re-opened in a query. This mean I cannot ...
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136 views

Cannot find /etc/init.d file in opensolaris

While installing MySQL , I noticed a point, I mean to start the MySQL server manually , use the command cp /usr/local/mysql/support-files/mysql.server /etc/init.d/mysql The error shown is : cp: ...
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50 views

I can't get MySQL server to stop running

The output from MySQL Workbench when I try to stop it is: Executing '/usr/local/mysql/support-files/mysql.server stop' 2013-12-23 21:08:29 - Stop server: ERROR! MySQL server PID file could not ...
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175 views

MySQL Load Avg High — CPU bound or IO Bound or Memory Issues

We are using MySQL 5.5 and the database is approximately 10TB. The load avg is constantly high during day time. Following are the configurations and a snap shot of a 'top' command. I wanted ...
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2answers
95 views

Mysql 5.5.25 must be restarted to connect

We have MySQL v5.5.25 running on Windows Server 2008 R2. Occasionally people are unable to connect, and the only way we have found to fix this is to restart the mysql service. This happens every 2-3 ...
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2answers
554 views

Warning before issuing delete/update command in mysql/oracle , then executes

Is there any utility , function either in mysql /oracle that if i issue some delete/update command wrongly , a message must prompt at command_line* (if possible in ubuntu) asking whether "you sure to ...
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1answer
204 views

Data Analysis with MongoDB or MySQL

I have a need for processing some data in order to come up with some statistic. This is the scenario: Each user can answer several questions from the question list. They pick their answers from a ...
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1answer
665 views

Datetime Difference in MySQL when format is Varchar

I have two columns in a table: STOP and START, of type varchar. I want to have the difference between both columns, and I'm using : SELECT DATEDIFF(stop, start) AS difference from T1; It is ...