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

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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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RDS MySQL Storage and N/W Usage

have Single Schema and single MySQL Instance on RDS Where my website users are creating app and app data stored in MySQL database in my schema each app has Unique id. One user may have one or more ...
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1answer
43 views

Not able to connect to local MySql database “only” when connected to VPN on VM [closed]

Setup: MySql installed on my Mac using Xammp VM installed using VMware Fusion running win XP. I am able to connect to the mysql database through my VM normally. As soon as I connect to a VPN it ...
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1answer
338 views

MySQL performance issue - intermittently slow queries

I manage an intranet application used by around 50 staff in a few locations. The application is hosted on a Windows Server 2008 VM with 8GB RAM and MySQL (5.5) is running on the same server as IIS. I ...
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Memory usage still growing

I have problem with my production mysql server. The memory usage is still growing and I don't know why. Trouble started when we changed the server. My mysql version: 5.5.44-0+deb8u1-log - (Debian). ...
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Enormous MySQL 5.5 Handler_read_rnd_next

The value of Handler_read_rnd_next is actually 91,3 G on my Database server but I am pretty sure that all tables have proper indexes. I am 100% sure that there is no query with a WHERE clause that ...
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20 views

Database design: history - transactions, states, durations?

I have not delved into this type of db info before, and it seems foreign to me what I need to do. So I would ask if this seems familiar to you, and is there a way this is generally done? (And would ...
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75 views

Proper database configuration

I'm running MySQL 5.5 on Debian 7.8. My entire DB is 2200 MB large (all tables are InnoDB), the mysql process is taking up to 6G RAM but still I think that not evrything is loaded in RAM I have large ...
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MySQL - installed version 5.5 but mysql --version says 5.0.95

I'm running CentOS 5.2 and upgraded MySQL to 5.5. When I run mysql I get this: Welcome to the MySQL monitor. Commands end with ; or \g. Your MySQL connection id is 11 Server version: 5.5.45 MySQL ...
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110 views

MySQL Load XML Infile with dynamic file name

I have a shell script which loops through a folder and picks up a set of files in turn. I then pass the filename to a .sql script so that the file can be imported into my database. BUT, I can't for ...
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216 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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7k views

MySQL slave stuck in “Reading event from the relay log”?

5.5.28-log MySQL Community Server (GPL) by Remi binlog-format=MIXED My problem is similar to this question. *************************** 2. row *************************** Id: 973415 User: ...
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239 views

MySQL Write performance bottleneck

We are trying to diagnose a MySQL Bottleneck, specifically for data writes. Basically, we have a single process that picks files from a folder and load into a MySQL table X using LOAD DATA CONCURRENT ...
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1answer
30 views

MySql - How to monitor the amount of reads/writes to the DB

Is there a way to fetch the amount of reads / writes made to the entire DB (MySql) in a given period, e.g. the amount of read / writes in the last hour?
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1answer
33 views

Create SQL Query in function or PROCEDURE

I am trying to create function inside MySQL to create several queries for example : DELIMITER | CREATE PROCEDURE queryBuilder(_tableName varchar(100)) BEGIN SET @str_query = ...
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45 views

Database Architecture & Design

I am building a web application for project management which will be hosted on my servers. My application design is like this 1 - user register 2 - domain name will be created i.e ...
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Migrating a DB of mysql 5.0 to 5.5

Sorry this is a newbie question. I have a DB of mysql 5.0 on a shared host and I would like to migrate this DB to another mysql server (5.5) on another shared host. What I did is like this. ...
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1answer
958 views

How to set unique columns combination

see this table: CREATE TABLE IF NOT EXISTS `default_messages_users` ( `id` int(11) NOT NULL AUTO_INCREMENT, `message_id` int(11) NOT NULL, `owner_user_id` int(11) NOT NULL, `to_user_id` ...
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What is the difference between optimize table and analyze table in mysql

What is the difference between optimize table and analyze table in mysql? I have read the online docs, but not sure what the difference is.
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How to autoincrement Prod_id based on Product_Name using trigger in mysql [duplicate]

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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intermittent MySQL crashes with error “Fatal error: cannot allocate memory for the buffer pool”

Added on edit, 2013-05-29: Because this is a long question and discussion, here's a short summary of the question and the solution. I had problems running MySQL and Apache on a small Linux server (1 ...
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1answer
57 views

Really strange behavior using variables in MySql query

I was answering a Question on Stack Overflow forum and the OP notice a really strange behavior that I could reproduce using the SQLFiddle site So lets go to it. We have this setup: CREATE TABLE ...
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28 views

MySQL can't connect as user with password locally

I am running into a strange authentification issue. Users can't connect to MySQL locally using a password, but they can without one. mysql -h localhost -u someuser -psomepassword won't work ...
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1answer
99 views

MySQL percona 5.6 to MySQL 5.5 replication

Scenario 1 I am having a MySQL DB on 5.5 which is compliance, So need to upgrade it to MySQL 5.6. while doing this we see that 5.6 is running slow, were as it runs perfectly on 5.5 backup. Scenario ...
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What happens if there is missing data in the slave MySQL server

At the data center there was electricity outage. And it appears that at that time my replication stopped syncing because it said something like this; "I cannot find the next position. Last proper ...
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35 views

Query to get the users who have a application approved

I have two tables Users and Submissions . Need to find the query to get the users who have submitted atleast one grant and have never won . I can write a subquery and achieve it .But I would like to ...
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202 views

Exception when trying to connect to remove MySQL from Intellij IDEA

I can't connect from Jetbrains IDA to my MySQL at AWS. I am getting exception: Connection to MySQL - aws failed java.sql.SQLException: Communications link failure The last packet sent successfully ...
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1answer
189 views

Subtract time difference between two columns in a table

Problem: How can I subtract the TIMEDIFF between two sensors (sensor 1 and sensor 2 in the example below) and return the the value in mili seconds? How do I get with the resolution of milliseconds? ...
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73 views

MySQL – Backup/Restore Selected Tables/Fields Only

I support a Python application (includes some C modules) that utilises a MySQL database. A number of clients are running this in a standalone environment but have agreed that we can use their data ...
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249 views

import text file getting command is not allowed with this MySQL version

here is my table CREATE TABLE cities ( country CHAR(2), city_ascii VARCHAR(100), city VARCHAR(255), region CHAR(2), population INT UNSIGNED, ...
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46 views

How to pivot a CSV file into a table

Input: a CSV file which cannot be changed prior to import Desired Output: A table where CSV_File.Name is a column and CSV_File.TagValue is the data in that column with a Key field Timestamp column ...
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Identifying table causing runaway rollback in MySQL 5.5 (InnoDB / Windows)

I have a large database (180 GB), running under Windows, with a runaway rollback that starts running as soon as the database is started up. I have started the database with innodb_force_recovery=3 ...
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How can i find next binary log to restore in mysql database

i am using mysql database,one database is writing data in binary log and those logs are sent to another machine through scp.In remote machine i want to restore binary logs. through mysqlbinlog ...
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changing mysql configuration . Getting errors like Table is marked as crashed and should be repaired

On Our server I have done following configuration for Database: [server has 2 core, 2 GB ram and windows 2008 operating system] query_cache_size= 32M [Old] query_cache_size= 50M ...
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1answer
347 views

Myloader command: Table doesn't exist

I took the backup of mysql database using mydumper command: mydumper -B mydb -o /backup/oct3 -s 500000 -c -m -S /tmp/mysql.sock -u root -p password@123 -v 3 Now, I am restoring mysql database ...
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289 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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InnoDB: Error: Table “mysql”.“innodb_table_stats” not found after upgrade to mysql 5.6

I upgraded to mysql 5.6 from 5.5, and now my logs are littered with such messages on startup I found a possible solution here, but it does not seem official. ...
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Is it possible to block a specific query, or return a static result?

Before you yell at me for doing it wrong, I know I'm doing it wrong. I'm using WHMCS (source code is not available), and we have a quarter of a million invoices. One particular query, which runs on ...
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1answer
1k views

Many mysql queries stuck at sending data

I am using opencart and I can se many queries blocking the mysql server. All queries are the same except the p.manufacturer_id. Attached there is the query and the explain of the query. The query is ...
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1answer
22 views

mysql performance

Currently,we are using mysql 5.5.4 database on server with 4GB RAM,500GB HDD on Linux.There are predominantly 3 databases and the maximum size of database is 100MB.Assuming data grows at rate of x mb ...
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1answer
46 views

Multiple select for single row insert

I need to insert a row into a table by selecting value from multiple tables. I want a row to be inserted from multiple tables. insert into tab(id,name,date) values ((select max(id)+1 from ...
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Significance of common schema - MySQL

Why common schema is not available in MySQL 5.6? What is the significance of it? So If there is a need for common schema for an application, what is the workaround to have common schema in 5.6 or ...
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354 views

SELECT RELEASE_LOCK causing “Mysql has gone away”

During a long running process (90m+), our code calls SELECT RELEASE_LOCK('..');. However it always gives a "Mysql has gone away" error when we do this. We never got to see the return value of the ...
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3k views

Amazon RDS MySQL performance issues

I have published my website on Amazon EC2 (Singapore region) and I have used MySQL RDS instance for the data storage. Everything is working very fine except performance. It seems that all queries, ...
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2answers
124 views

Mysql datetime field partial match

Currently I am designing a mysql table structure that will hold a couple of million rows. I want to search in it on datetime field by date year and so on but the date will be entered by user so it ...
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1answer
616 views

MariaDB/InnoDB: Temp file write failure

When attempting to alter a table to enable compression by modifying the KEY_BLOCK_SIZE I received the error: ERROR 1296 (HY000): Got error 64 'Temp file write failure' from InnoDB The command ...
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1answer
91 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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564 views

Amazon AWS RDS Aurora Row size too large (VB5)

We're trying to import our vbulletin 5 database into RDS/Aurora and getting this: ERROR 1118 (42000) at line 5733: Row size too large (> 8126). Changing some columns to TEXT or BLOB or using ...
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MySQL - Truncated incorrect datetime value on update statement

I have an application which produces log files. These log files include a Timestamp field in the format 2015-08-25T09:35:01 UTC. (there will be apx 60 logs produced at 0.25 GB per day). I need to ...
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137 views

MySQL - include a default value in LOAD XML INFILE statement

I have the follwing table: CREATE TABLE `tab1` ( `id` int(10) unsigned NOT NULL AUTO_INCREMENT, `DEFAULT` VARCHAR(25) DEFAULT NULL, `ITEM` varchar(25) DEFAULT NULL, `TIMESTAMP` TIMESTAMP ...