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

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How can I return column names in dot notation in MySQL?

I want to return column names into a table. But I also want to avoid redundancies like 'id' and 'id'. I did: INSERT INTO columns(name) SELECT COLUMN_NAME FROM INFORMATION_SCHEMA.COLUMNS WHERE ...
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59 views

Create user for alternate port

I am running a private MySQL instance on WebFaction WebFaction is a shared host who provides both for their public MySQL instance and for your own private MySQL instance. The private instance is a ...
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245 views

MySQL Synchronous Replication on Ubuntu 12.04 with DRBD

I have been looking around for some easy and open-source ways to handle database synchronous replication. DRDB on a Linux server seems to be one of the fastest and easiest methods to handle database ...
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107 views

Is there any query to fetch the a single row data in chunks?

The data stored in a row is just like "Phone Number:--- xxxxxxxxxxx Call Type:--- MISSED Call Date:--- 2013-06-13 Call duration in sec :--- 0 Phone Number:--- xxxxxxxxxxx Call Type:--- OUTGOING Call ...
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4k views

BEFORE INSERT trigger in MySQL

I am new to MySQL and I'm having problems creating a BEFORE INSERT trigger. I get an unexpected END error. I have a table named verlof_aanvragen with a column datum (and 6 more columns). What I ...
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2k views

How to run a SELECT query within while loop in PHP?

Within a SELECT query via PHP while loop, I need to run a mysql SELECT query as $result1 = $mysqli->query("SELECT * FROM table1"); while ( $row = $result->fetch_assoc() ) { if ( $row['X'] == ...
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220 views

Is there a way to find the least recently used tables in a schema?

Is there a way to find the least recently used tables in a MySQL schema? Besides going into data directories? I was hoping there was a metadata or status trick-- but Update_Time in STATUS and ...
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435 views

MySQL+Web-App Performance Issues using different servers

We are having a performance issue with our MySQL servers that does not make any sense. I have read countless articles from many people (mostly Percona) and have made my.cnf tweaks. We have even manage ...
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438 views

Innodb table is taking randomly long time to execute the insert query and in show processlist showing as queryend/updating

Innodb table is taking randomly long time to execute the insert query and in show processlist showing as queryend/updating and it happens for the similar queries for the same table and the queries got ...
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1answer
64 views

ORDER BY optimization issue

I have a query: SELECT user_details.id , user_details.first_name , user_details.last_name, user_accounts.name account_name, jtl0.account_id account_id, user_details.title , ...
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1answer
179 views

Unable to use mysql_upgrade:

I updated mysql recently and found problem related to privileges and backup. When I am using mysql_upgrade command it says- mysqlcheck: Got error: 1064: You have an error in your SQL syntax; check ...
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471 views

Table corruption: How to perform Innodb Checksum checks in MySQL 5.5 for Windows?

Having a corrupted Mysql 5.5.31 (Windows) database, my question relates to the the top solution provided in How do you identify InnoDB table corruption? , more precisely to the following script that ...
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592 views

MySQL replication — issue with mysql.proc during replication from 5.0 to 5.5 host

We are replicating from a mysql 5.0.45 host to a 5.5.26 host over WAN. Every once in a while one of our databases does not accept a query and halts the replication. "'Column count of mysql.proc is ...
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1answer
100 views

Changing TEXT to VARCHAR

In a MySQL database (InnoDB) we have a table containing roughly 60.000.000 rows. One of the columns is of type text. Currently the longest entry has length 360 (found using SELECT MAX(LENGTH(value)) ...
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1answer
178 views

Unique index on 2 columns in mysql

I have one table in mysql named 'UserFriends' where I am updating my websites user's friends details. here is the schema of the table (UserFriends) id int, Userid int, friendid int, createdate ...
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141 views

Breaking Semisynchronous Replication in MySQL 5.5

I've set up Semisynchronous Replication between two MySQL 5.5 servers running on Windows 7. My application is running and updating the database of the master server and same is being updated in the ...
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1answer
214 views

Create a mysql slave database from master database

I have a mysql master database running. I want to have a slave database. So, I stopped the master mysql database and copied it to the slave machine. I had bin log enabled on master so even those files ...
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184 views

Should master and slave have same mysql version?

I have a master database running mysql 5.5.11, and I am planning to setup a new slave. I am planning to use the 5.5.30 as it is the latest version. For setting up new slave, I am copying files from ...
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97 views

In Mysql 5.5, why is the upper bound of a character range not inclusive?

So I'm trying to query on a character range, i.e. all manufacturers with names starting with a or b: SELECT manufacturer FROM warehouse WHERE manufacturer >= 'a' AND manufacturer <= 'b' or: ...
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1answer
1k views

MySQL 5.5 - determining correct write[read]_io_threads on high-end system?

Specifically dual-CPU 32 core - 128RAM - RAID 10 SSD . Ubuntu 64 server. Heavy Innodb load at times - ~ 2000+ queries per sec. Heavy read and write. Currently we are running on the default ...
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1answer
137 views

Server load discrepency in Slave with Master load being low and constant

We have MySQL Replication Master/Slave Setup db01 Master db02 Slave (ReadOnly) We are getting load discrepency on the Slave (db02), but the Master's (db01) server load is low. MySQL is the only ...
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2answers
854 views

Trouble with triggers and insert .. on duplicate key update

I have two tables with identical schemas. one is a "main" table that is pruned periodically and kept small. The other is a "reporting" table that is an archive of everything that ever was. For ...
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1answer
1k views

Retrieve double data type value in non exponential form

Is it possible to retrieve non-exponential value in double data type column? After the width of the column is increased to 15 it shows the values in exponential form. Now I get the following: ...
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1answer
154 views

MySql - selecting into file and re-loading it with special characters

I have a MySql table called twitter_statuses which as the title suggests holds twitter statuses. here is the table structure. this table contains all sort of characters in the text column, and some ...
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1answer
141 views

MySQL Cluster Steps To Recover Data If Catstrophic Failure Occurs

I want to know if a catstrophic failure occurs (like a power outage), and all nodes in MySQL Cluster are shutdown in cluster then data will be lost even though a backup was taken? Or it possible that ...
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299 views

MySQL-5.5 InnoDB memory issue

Version in use is mysql-5.5.24. In the Enterprise version of MySQL innodb_buffer_pool space is released after a while, however this does not appear to be happening in the community version. I am ...
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286 views

Mysql 5.0 on Windows 2008

I have a problem with MySQL on Windows Server 2008 x64. This is the first time I've installed MySQL 5.5 with performance problems. I decided to go back to the older version that worked well with ...
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608 views

Does TRANSACTION/COMMIT/ROLLBACK only work on certain MySQL engines such as InnoDB?

Are transaction functions only relevant for particular database engines on MySQL, or are transactions supported under all MySQL engines, including MyISAM and InnoDB? someone says here that ...
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1answer
588 views

MySQL Master-Slave Replication Cross Database

I am setting up Replication for cross Database as i have set 2 variables in Slave' s my.cnf as replicate-do-db=database_name and Replicate-wild-do-table=database_name.% ,But i am not able to get ...
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1answer
496 views

MySQL Replication Error, can't stop slave

When I run command SHOW SLAVE STATUS\G, I see Slave_IO_Running : 'Yes' Slave_SQL_Running : 'No' What I've usually done to fix this is to run STOP SLAVE; SET GLOBAL sql_slave_skip_counter = 1; ...
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1answer
157 views

Get and count all blog posts and all users that fits a LIKE condition (two sepparated queries)

I've this tables: -- -- Table structure for table `default_cmvblog` -- CREATE TABLE IF NOT EXISTS `default_cmvblog` ( `id` int(11) NOT NULL AUTO_INCREMENT, `title` varchar(100) COLLATE ...
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703 views

MySQL INSERTs waiting for UPDATEs (MyISAM)?

In show processlist;, MySQL 5.5, we see that INSERTs tend to wait for UPDATEs to complete before they can proceed. This is on MyISAM tables. We tried INSERT HIGH_PRIORITY and UPDATE LOW_PRIORITY. ...
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120 views

Several values from different tables

I'm totally lost here and not know how to get this to work and hope any can help me here. I have several tables: default_users, default_profiles, default_status, default_comment and latest ...
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2answers
2k 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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1answer
124 views

slave issue with load data

When I use "load data infile" on master, the data is properly transferred to slave. But when I use "load data local infile" from remote server to master, the data does not pass on to slave. Why does ...
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1answer
115 views

How to Archive Only MySQL Master not the Slave.?

Currently I have a Master and Slave. Both of them have same set of data(Can Say are in Sync).The Replication is running fine. What i need to accomplish is that... Need to Archive the Master(Say I ...
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1answer
1k views

MySQL Workbench ERROR 1064

I have a problem with my database. I have created the model and now I want to sync it with my database on my WAMP Server (local) but it keeps giving me an error. I searched for the cause of the ...
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1answer
441 views

InnoDB - How to get top locked tables and rows which are locked

I was searching for a tool OR query which can give me top locked tables and which particular row is locked, Is it possible to get ?
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243 views

Referring to super parent or as a separate entity?

I have this person table as super parent, id firstname lastname email telephone ... ... and user table as a child id person_id (FK) password username screenname ... ... They must be 1:1 ...
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1answer
427 views

Does replication with SSL encryption work on MySQL 5.5?

I am trying to set up replication with slave on Amazon EC2 and master in our local environment. The setup went fine without SSL encryption. But when I set up the replication to be SSL encrypted, it is ...
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3answers
754 views

“Too many connections” when running MySQLDump

MySQL 5.5.x on Windows, 4GB RAM. I have a Wordpress Multi-Site install. The WPMU db contains over 6k tables (I know, horrendous... WPMU is not my favorite app right now) I am running mysqldump ...
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1answer
229 views

mysql event running at wrong time

I created an event to run every 24 hours and be run at 14h. Its selects some data from tabels and writes it as to a file (csv format) The query and writing to file goes ok. The event is triggered. ...
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1answer
859 views

I am getting an error while trying to download binary for mysql 5.5.11

I am trying to upgrade MySQL 5.1 to 5.5.11 on Ubuntu 10.10. Everytime I try the wget command I get this error: wget ...
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1answer
743 views

mysql error log issue

I have mysql server running successfully. The error log location is as.. mysql> show variables like '%log_erro%'; +---------------+------------------------+ | Variable_name | Value ...
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1answer
175 views

Appropriate Windows version for Mysql

I have a HP ProLiant DL380 G5 server and I would like to install mysql on it . My questions are: Which MySQL version should I install from this link for better performance, 32 bit or 64 bit? Which ...
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2answers
1k views

Why a copy of my.ini of other MySQL installation not working on my PC

I have two MySQL installations on two different PCs not connected to each other. I made some changes in the my.ini file of PC 1 and tried using this file on PC 2, but MySQL service fails to start. Why ...
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22 views

MySQL - grant all privileges on *.* brings back Access denied

GRANT ALL PRIVILEGES ON *.* TO 'username'@'localhost' IDENTIFIED BY 'somepassword'; Brings back error : ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: YES) If ...
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36 views

How to log within a stored procedure that is encapsulated within a transaction

I have a stored procedure, let us call it sp_A which calls other stored procedures, let us call them sp_B and sp_C. For the sake of consistency an XA TRANSATCION is started within sp_A. What I ...
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What to do with unused RAM on a MySQL database server?

For years I have been running dedicated servers with more or less limited ressources, resulting in unsatisfying performance of the web application (Drupal). Tools like Matthew Montgomery's MySQL ...
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2answers
36 views

MySQL user without SUPER privilege

This may be a simple question and may not be the right place to ask but I couldn't find any useful information from Google. Here is my question. When creating users in mysql using grant all ...