MySQL version 5.5 - please also tag with mysql for search purposes.

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How to create two same name databases in two different MySQL users?

I am using MySQL 5.5 running on Ubuntu 12.04. I have created two different users as 'root' and 'abc' and I want to create 'Items' database in this both user accounts but I want this two databases ...
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260 views

mysql forbidden database names

I was wondering whether there were a list of forbidden (reserved) database names in mysql. For instance, mysql is obviously one. But is there a determinated list? I don't want to cover 99% in my ...
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804 views

How to update a table by count from another table?

I have two tables as CREATE TABLE country_statistics ( id int(11) NOT NULL AUTO_INCREMENT us int(11), uk int(11), ca int(11), PRIMARY KEY(id) ) ENGINE=InnoDB DEFAULT CREATE TABLE entries ( id ...
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84 views

MySQL Partitioning: why it's not taking appropriate partition

DROP TABLE temp; CREATE TABLE `temp` ( `CallID` bigint(8) unsigned NOT NULL, `InfoID` bigint(8) unsigned NOT NULL, `CallStartTime` datetime NOT NULL, ...
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Help my database isn't performing fast enough! 100M Merge with 6M need < 1 hour!

I have a server right now receiving more raw data files in 1 hour then I can upsert (insert -> merge) in an hour. I have a table with 100M (rounded up) rows. Table is currently MyISAM. The table has ...
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4k views

Error “#1118 - row size too large” on the first row of the table only

I ran into a problem using a mySQL database. I have some columns as type text but when I try to enter data into the first row I get the error code "#1118 - Row size too large. The maximum row size for ...
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45 views

Misunderstanding statement in MySQL documentation

I can't understand this statement in Optimizing Data Size: Declare columns with identical information in different tables with identical data types, to speed up joins based on the corresponding ...
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2k views

Steps to upgrade MySQL from version 5.0 to version 5.5

I have been developing under MySQL v5.0 for a while now and need to upgrade to v5.5 to be in step with the hosted production server. After having searched for precise steps to do this migration, I am ...
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450 views

MySQL Slave Lagging Almost Daily -Ver 5.5.17 ( Master & Slave )

I am observing this lag in a continuous manner. Investigating in the bin log events, i found the following information. Slave executing the relay Logs slowly. 1. Changing the Innodb File Format ...
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67 views

What would be the first things you do to find out about an MYSQL environment you are taking over?

I am new to DBA role, and wanted to know if there was any commands (or free software) that come with Mysql 5.5 (master/slave/slave) replication to quickly get familiar with the database, and also ...
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57 views

2 Very similar queries return different number of result (one is null)

I want to find businesses near a point that contain a word that start with sea lat=-6.185068&long=106.773121&keyword=sea&distance=5000&startfrom=0&howmany=20&prominent=5 ...
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232 views

Which is the best tool to monitor replication on MySQL 5.5.20? [closed]

I have just installed and setup replication for 3 MySQL 5.5.20 server( 1 Master/ 2 slaves). I intend to add more slaves to the equation. Which is the best software tool to monitor the replication ...
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91 views

Practices to keep SQL Server databases easy to port to MySQL?

We've developing an ASP.NET Web application that is to be designed for MS SQL Server 2008. I'd like to minimize my future dB admin's headaches should there be a need to migrating over to MySQL. With ...
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39 views

Upgrading to MySQL 5.5 from 5.0 looks broken

I was using SLES SP3, and had earlier MySQL 5.0.67. I upgraded it to 5.5.48 (available with the CD) after upgrading my OS to SP4. I edited the /etc/my.cnf file, and replaced skip-locking to ...
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56 views

MySQL dies at same time by night [closed]

my MySQL Database dies every night at around 11p.m. and I have absolutly no idea whats the problem. Maybe you can help me: The error.log says: 160412 11:37:13 [Warning] IP address '123.158.49.205' ...
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39 views

What is the difference between CREATE INDEX and ALTER TABLE ADD INDEX? [duplicate]

I have searched the web but I have failed to find a conclusive answer for this question. Is there any difference between CREATE INDEX and ALTER TABLE ADD INDEX? Are there any problems that may ...
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46 views

Select rows with most recent date for the given date

I have a table to manage the stock which looks like below product batch qty date Grape BAT0 42 10/3/2016 Apple BAT1 12 11/3/2016 Banana BAT2 15 11/3/2016 Orange ...
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85 views

sql_safe_updates set to ON by default

This is fresh mysql install from Debian apt. mysql> \s -------------- mysql Ver 14.14 Distrib 5.5.47, for debian-linux-gnu (x86_64) using readline 6.3 .. Server version: ...
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28 views

Optimising a query with two aggregate fields

I have a table in a MySQL 5.5 database with around 7 million records, with fields typeId, regionId, scanTime, scanId and a query that returns around 239,000 results. For every combination of typeId ...
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27 views

selecting duplicate values with a condition from a mysql table

I have the following table in mysql: Key DI CI FD FA NM Valid_from Valid_to 0 1224468 123 2012-06-30 3 6 2013-01-23 9999-12-31 1 1234567 123 2013-12-31 3 ...
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236 views

MySQL starts using > 90% of CPU, “Copying to tmp table on disk” and “converting HEAP to MyISAM”

I have a server where MySQL is periodically taking up 11 of the 12 CPU cores. Once this starts it doesn't end until I restart MySQL. At least, I haven't let it run like this for more than a half hour ...
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208 views

MySQL Trigger On UPDATE “Unknown Column” Error

I want to log a table when its updating a row which is column "insertDate" or "updateDate" value is before than 3 month. I wrote this trigger: DELIMITER /// CREATE TRIGGER ...
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75 views

Copying MySQL schema, some tables not getting recognized!

From the 'data' folder of my colleague I copied the entire 'MyDatabase' folder and pasted that in my own 'data' folder.Now, some tables are getting recognized while others are not.**All the tables are ...
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What could cause a record to appear in the MySQL binary log but not the original table?

I have a web application (CiviCRM) that has the option to enable binary logging, which I've done. We use this software to record donations, including automatic recurring donations. Our payment ...
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92 views

mysqlbinlog: unknown variable ssl_key or ssl_cert or ssl_ca

I am trying to recover binlog from a remote server using mysqlbinlog client program, however it appears that mysqlbinlog doesn't recognize the SSL options that's required to establish SSL connect to ...
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2k views

Use of log_bin_trust_function_creators in MySQL

What is the use of log_bin_trust_function_creators? Also, Is the value of the parameter dynamic? Will it change if I restart my MySQL service?
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80 views

Backup a huge database 200gb+

i have a mysql database where i need to take a backup of the log database. the problem is the log database i over 200gb and contains over 280 millions of rows, i need right now to remove a kind of ...
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97 views

Working with variables in stored proc

I want to create a meta table on the fly using a stored pdocedure and passing a table prefix as "in" parameter and then build the final table name somehow. My code looks like this: SET @table_ = ...
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340 views

InnoDB Index Doesn't Fit in Memory

I am using InnoDB tables in my database and total index_size is 250 GB and my data size is 500 GB. Server has 128 GB RAM, and innodb_buffer_pool_size is set to 64 GB. Data size is increasing every day ...
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253 views

'USE db_name' takes too long to change when login remotely

I gave SELECT privilege to a user on a particular database, Now whenever I try to connect remotely $ mysql -h ip-of-remote -u username -p with that user credentials and try to change the database ...
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189 views

How to most efficiently store possible combinations of categories?

I have a table of categories (currently with 14 rows, not likely to change). A need to cache combinations of categories emerged, so I'm creating a table of allowed combinations (only few hundreds of ...
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21 views

Import lots of mysqldumps with missing CREATE DATABASE

I have a bunch of mysqldumps of my old server with one database each. Unfortunately we forgot to add CREATE DATABASE ... in all those dumps. How can I import those files in one batch?
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Error: Incorrect usage of UNION and ORDER BY

I have this query: SELECT DISTINCT CONCAT (MONTH(`Date`),'-',YEAR(`Date`)) from wp_result_plugin WHERE Bet=2 AND month(`Date`) = EXTRACT(month FROM (NOW())) ORDER BY MONTH(`Date`) ASC UNION ...
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303 views

mysql database under symlinked directory: ERROR 1018 (HY000): Can't read dir of './<dbname>/' (errno: 13)

I'm using mysql 5.5 on an ubuntu linux server. I need to move a database from its current location (under /var/lib/mysql) to a disk with more space, so I attempted to move the directory and create a ...
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22 views

Can combine five mysql statements into just one statement?

Can I combine all the five statements into just one statement? update mytable set myfield1 = replace(myfield1, '…' ,'-') ; update mytable set myfield1 = replace(myfield1, '‖' ,'|') ; update mytable ...
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46 views

Unable to get the latest value added to Mysql table based on posted time

SELECT * FROM discussion_comments GROUP BY disc_id ORDER BY posted_date DESC I have table example like given below: CREATE TABLE example ( id int(11), cname varchar(11), posted_date date, ...
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933 views

MySQL: How to write a recursive function to show menu tree?

I try to build a menu tree inside the SQL with this function: DROP FUNCTION IF EXISTS hello_world; DELIMITER $$ CREATE FUNCTION hello_world(_typeId INT, _typeText TEXT) RETURNS TEXT BEGIN ...
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1answer
194 views

mySQL running on 100% CPU both on RDS and EC2

How do we troubleshoot an issue with Amazon wherein my database queries (PHP/MySQL) are eating 100% CPU most of the day? Traffic=200 connections average mySQL version = 5.5.40 The ...
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366 views

Add linked server from SQL-Server to MySQL: “Data source name not found” (Error:7303)

I'm trying to link my SQL-Server 2005 on Windows Server 2008 R2 with MySQL 5.5.40 on a different computer. I have followed this guide: ...
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76 views

Unique constraint for new values only

I have a large table with a column that contains duplicates. I want to add a unique constraint on this column for future entries only (not the old data). Is this possible?
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474 views

MySQL Workbench - “deploying” schema into a real database

a noob here, finding my way around. So, how can I "transfer, deploy or whatever the right term is" the database tables, fields, etc. that I have created with Workbench into a real database? The dB I ...
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487 views

Is it possble to replicate MySQL server on Azure virtual machines

I have two Windows Server 2012 R2 virtual machines on Azure. I need to replicate the database on each of the windows servers. I have followed this link but I am not getting the connection between the ...
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1answer
57 views

Mysql Master - Master Replication

i have established a master A and master B replication between two servers.Both are getting replicated.But it is limited with only one database. My questions 1.How to create a new database in ...
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2k views

Following mysqltuner suggestions: query_cache_size and join_buffer_size

So I am following the suggestions of mysqltuner, and so far I've had great results, the server is performing well (dedicated VPS running a large Magento eCommerce store) There is only two issues left ...
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258 views

too many connection error mysql: how to calculate max_connections

how to calculate this values to get the best results to resolve this error "too many connection error mysql" and make my API faster in mysql wait_timeout = ?? max_connections = ?? ...
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922 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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104 views

Importing Data with Single .ibd file

I have one ".ibd" file with me. I have configured my local Database server with FILE_PER_TABLE option. i have two question here. When i was trying to restore/import the IBD file, the engine expect ...
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423 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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37 views

Is it possible to restore a database snapshot from a 64 bit system to a 32 bit one?

I would like to perform a restoration test on a snapshot backup of my MariaDB database using a test server running on a 32-bit OS. My production server is a 64-bit system. I would like to know if the ...
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433 views

Database Design Help: MySql/PostgreSQL Single Database/Multiple Databases

We are planning to build a web based custom business analytics tool using PHP and MySQL/PostgreSQL. In our application, we are planning to upload customer’s data using a Excel sheet and these data ...