MySQL : Open-Source, Relational Database Management System

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Can't change root password: “The system cannot find the file specified.”

I'm trying to change the root password in MySQL on my development machine (I've just installed MySQL, so it currently doesn't have a password), but it keeps failing with the following error message: ...
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1answer
283 views

phpmyadmin not working after mysql update

i followed this guide to update my mysql form 5.1 to 5.5. After lots and lots of command and headache, i was able to upgrade mysql. i checked the version via terminal. But now there is another ...
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38 views

Query that was working on MySQL is not working on PostgreSQL

I had the following query (with bin_number being a string) which was working on MySQL 5.5: Postgres - was working on MySQL and doesn't work on PostgreSQL SELECT "menu_items".* FROM "menu_items" ...
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1answer
25 views

What is the performance benefit when using a temporary table to update a regular table?

I'm trying to understand what the performance benefit between two different methods of updating multiple table rows. For the first method we have an explicit update statement for each line to be ...
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1answer
128 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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11 views

InnoDB Table has backed up INSERT and UPDATE queries, high CPU

I am running an MySQL DB with all InnoDB tables. I often have many queries backed up for the same table when I run SHOW PROCESSLIST; Basically, I keep a table of every logged in customer and update ...
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1answer
113 views

Index to fix this query MySQL

We have an extremely large forum running lots of third party software (Most of which doesn't run all that well) and we're starting to optimize things as time allows. This query keeps popping up in the ...
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2answers
203 views

How can I optimize this query and support multiple SKUs?

My current query only can select one SKU at a time. I can leave salesite_id constant. If there is a way to also have varying salesite_ids that would be good too, but not necessary. Also any ...
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1answer
23 views

sql query for hierarchal search [on hold]

In the below relational table, I want to search all user id's whom are are under any particular sponsorid in hierarchical manner User Id Name Sponsor Id 10030080 TULSI RAM ...
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1answer
36 views

Get the latest record and count them with time interval

I have a table as below id fk_sales_id status created_at 1 001 5 2015-02-17 16:45:44 2 001 8 2015-02-18 18:45:44 3 002 30 2015-02-20 16:45:44 ...
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1answer
170 views

How do I write this script?

I have a very large database and I want to select certain records and then set a column value such as: SELECT name, email FROM table WHERE zipcode = 12345 INTO outfile /tmp/file.csv; Then I ...
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1answer
261 views

unable to insert utf8mb4 characters in mysql 5.6

recently i was facing problem in inserting emoji and other 4 bytes character in my mysql database then i found that my mysql version was 5.1 and it does not support utf8mb4 so i upgraded to mysql 5.6 ...
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189 views

Get child record from specific root

I have two tables articles and topics and I am using MySQL 5.6 Articles id topic(fk on Topics.id) featured 1 1 1 2 2 0 3 3 ...
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1answer
571 views

SQL Query challenge

I have what seemed like an easy query to write, that really has me stumped - can anyone help me please? So this is really easy on paper, but I can't translate it into SQL. Lets say you have some ...
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1answer
117 views

mysql restore from data directory

I recently asked a question regarding the restoration of a pretty huge (around 300 to 400 GB) mysql database and got some nice suggestions as seen here. Now, I have backed up the data directory of ...
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1answer
193 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
119 views

Relaying changes to a slave from another master with Tungsten on MySQL

I am trying to setup a multi-master type of replication with each master having an additional slave using Tungsten. As an example, lets say I have 4 hosts (A,B,C,D) and hosts A and C are the masters, ...
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1answer
128 views

Please suggest my.cnf configuration based upon mysqltuner findings

I have been facing a lot of slow browsing on my site nerdeky.com. My server administrator suggested me to use mysqltuner.pl to find and tune my databases. Can anyone select me what should be the good ...
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1answer
99 views

Fastest way to insert data into mysql from csv

I have a dataset of 233,902,846 rows in a csv file. I want to load the data into mysql table. What is the most efficient way of transferring the data so that data insertion is the fastest. actually ...
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17 views

I want to rewrite my MySQL query so that FIND_IN_SET doesn't do a full table scan unless necessary

I want to rewrite my MySQL query so that the last table join doesn't do a full table scan unless necessary. Here's what I mean. Under certain conditions I don't need to select any rows in that join ...
2
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1answer
248 views

Table design problem

I'm looking for a SQL design solution for the following problem. The idea is that I have a validation form that contains the client's data. Each client can log in to his account and edit his data. ...
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1answer
575 views

MySQL relay log rotates too soon and too often

I have a simple master/slave setup where the slave is just a backup. Sometimes I notice that the relay log on the slave rotates too often and too soon, when it is still very small: 4:00 PM ...
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1answer
90 views

MySql MBRCONTAINS not accurate

I have a table that has 3 column. city_id, city_name and city_geo. city_geo type is geometry. and i have a another table that has a vehiclelog. I want to query if the latitude and longitude from ...
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1answer
90 views

MySQL over total memory allocated usage? memory leak?

i'm using 5.6.21-70.0 for performance test. when i run mysqlslap -a --concurrency=40 --number-of-queries 1000 --iterations=500 --engine=innodb --debug-info -utest -p do some performance test ...
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1answer
24 views

Guidance in creating a database for parks division attendance data [on hold]

We(group project) are trying to design a mysql database for our client which is a division of Off-Highway motor vehicle parks. Our client keeps tack of attendance data by month of many different ...
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1answer
31 views

combining two different record into single result

I am fetching data from 3 tables with the help of join. My output is in JSON format. Output in JSON format:- {"order_id":"2", "location_address":"Testing location Delhi", ...
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1answer
39 views

how many database tables is too much?

I'm working on a project for a school and so far I have 91 tables! Everything is linked to the student table, is it normal to have this many tables in one database? or do i need to make multiple ...
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1answer
20 views

How to implement a distributed database system [on hold]

I have been tasked to find out how to implement a distributed database system using the various database management software available like: MS Access 2013, MySQL and PostgreSQL. How would I be able ...
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10 views

MySQL Server Install Setup Types Developer Default vs Full

As I'm installing MySQL Server Community Edition the possible Setup Types are: Developer Default Server Only Client Only Full Custom Is there any difference between options Developer Default and ...
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1answer
40 views

How to merge two databases, both with primary keys

I have two databases, both with the same tables, but the data is out of sync. I need to add data from database A to database B, but not overwrite any data in B that exists in A, instead add it with a ...
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2answers
126 views

MySQL login after install

I was install mysql5.5 version.When i was install mysql at that time i was completed secure installation precedure by using "sudo mysql_secure_installation" this command. Now when i trying to login ...
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1answer
299 views

Mysql HY000 the table table_name is full when adding new column

I can't add a new column innodb table which size's 16MB. when I try to add, mysql says HY000 the table table_name is full. I changed my tmp_table_size and heap_size but mysql still says same error. ...
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2answers
4k views

How do I add a MySQL linked server to SQL Server?

I am trying to add a linked server on SQL Server to MySQL Server. Note the SQL Server is installed on a separate machine with a different domain name. The SQL Server is 10.0.1.1 on old_domain.com. ...
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1answer
233 views

Can I change max_allowed_packet for a MySQL database, but not others in the same instance?

We have a MySQL server with multiple databases in the same instance. Can I change the max_allowed_packet value for just one of the database? From looking at this, it seems SET GLOBAL ...
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13 views

Export MySQL query log to JSON format

Is there any tool which is capable of exporting MySQL query log to JSON format (or any other structured format)?
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1answer
169 views

How to export a MySQLtable with a longBLOB column to an Oracle database?

In MySQL I have a table: Select * from Dummy; Columns like below: id name salary binary_col 1 a 100 A.pdf 2 b 200 b.pdf 3 c 300 c.pdf 4 d 400 d.pdf 5 e 500 e.pdf ...
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1answer
139 views

Can a slave with a dynamic ip update the master

How can I setup mySQL replication in such a way that a slave on localhost with dynamic IP can update the master as well as get updates from the master which has a static IP. The slave will not be ...
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1answer
614 views

Is it safe to use mysqldump to backup and restore a master-master cluster

Not sure if the specifics matter but just to get it out of the way I am talking about a Galera cluster on XtraDB (MariaDB). I have a master-master setup and am interested in backing up and restoring ...
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1answer
124 views

MySQL taking significantly longer to query via PHP than CLI

TL;DR: I have a query that takes under a second to run via MySQL's CLI, but over 12 minutes via PHP and I'm at a total loss on what to check next. It's a fairly horrid query, full of joins, but the ...
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1answer
32 views

Finding the same value in a column and only returning rows without the same value

I have a query that i have to find the DiscountPercent that are the same and not show the rows with the same DiscountPercent. I have tryd this and it brings back the values that are the same SELECT ...
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1answer
220 views

Could not start mysql or MariaDB. Permissions were ok, but mysql-bin.index permission error

Using MariaDB 5.5.36. Here's what I got while trying to start MariaDB: # syslog Dec 14 09:40:52 vps1497 mysqld_safe: Starting mysqld daemon with databases from /var/lib/mysql Dec 14 09:40:52 vps1497 ...
0
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1answer
297 views

Does MySQL load the entire row into memory, or just the columns used in WHERE, ORDER BY and GROUP BY?

I have a table that isn't very large row wise (in the 100ks range), but that contains a lot of raw data that is very large in size. Despite having a relatively little number of rows, it's around ...
0
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1answer
12 views

Unable to get any type of connection using mysql on LAN

My question is rather simple, I have a Windows 7 machine that is hosting an Apache server and a MySQL server using the XAMPP control panel. Both of these have been installed as a service on the ...
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1answer
23 views

delete query performance issue on mysql

I have two tables table1, table2 where table2 is a subset of table1 (basically created with the query create table table2 as select * from table1 where .....) Now, I am trying to run the below query. ...
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2answers
2k views

MySql InnoDB tables are missing after restarting

I had a MySql database with a few InnoDB tables. After restarting the server, and starting MySql Server again, I connected to the MySql Server using MySql Workbench, and couldn't see the database at ...
0
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1answer
24 views

How to restore database from /var/lib/mysql

I have a database folder from a crashed server called gain_wordpress. I'm trying to put that database on a new server but I'm not able to do it successfully. I don't have a .sql dump, all I have is ...
0
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1answer
22 views

Change MariaDB 10.0.17 (MySQL) master to a slave

I have a MySQL master/slave configuration -------- -------- | master | -> | slave1 | -------- -------- I want to kill my current master, transform slave1 to be the new ...
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1answer
136 views

MySQL: Optimize query with a range and distinct count

I have a query on a large table with millions of rows that looks like this: SELECT COUNT( DISTINCT clicks.tx_id ) AS unique_clicks_count , clicks.offer_id FROM clicks WHERE ...
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17 views

Slave executing queries with different charset

I need to change a database charset because of this issue and I solved my issue in staging environment with the SQL command ALTER TABLE `articles` CONVERT TO CHARACTER SET utf8 COLLATE ...
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1answer
21 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, ...