All versions of MySQL (not Microsoft SQL Server). Please also add a version-specific tag like mysql-5.7 if that is relevant to the question.

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1answer
380 views

MySQL Query with good execution plan is very slow due to Sending data operation

I have the following query: SELECT a.borrowerId AS borrower_id, a.created, NULL AS initiator_team_id, NULL AS initiator_user_id, NULL AS old_team_id, NULL AS old_user_id, ...
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0answers
12 views

MySQL Database delay [on hold]

I've made my TV into a clock using PHP, a dedicated machine, and recently am adding MySQL to the equation to allow editing the settings from my phone. I've gotten this working, however, there is an ...
0
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2answers
105 views

MySQL get values from the other table by using inner joins

In mysql I have 3 tables called as ps_product_lang ps_order_detail and ps_image here are the tables sample data === ps_product_lang === CREATE TABLE IF NOT EXISTS `ps_product_lang` ( ...
0
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1answer
24 views

Display the the result of a substraction in a MySQL query (1 table)

I've made a table that looks like this: stop (table name) -cityName {PK} -schedule {PK} -price -routeNo Basicly the customer wants to know what's the cost difference between 2 different stops by ...
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2answers
562 views

Update table from calculated temporary table

I have two tables, one containing a set of user ID's, vote direction (-1 or 1) and ID of the object they voted on (casted votes table). In the other table, the object id, upvotes, downvotes and ...
4
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3answers
718 views

Finding differences between a master and slave when pt-table-sync fails

I have a table that's showing some differences on a master and slave according to pt-table-checksum (PTC). I've found some verifying differences beyond that. Certain tables in the mix have composite ...
0
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0answers
8 views

T-SQL to MySQL conversion for PIVOT [duplicate]

I made a garbage table with garbage data and a PIVOT on it in T-SQL format and I would like to convert it into MySQL but I can't figure out how to get it to work. Table and data: CREATE TABLE ...
0
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1answer
203 views

MySQL - When Command column in Processlist shows “Prepare” or “execute”

Can someone please highlight when a "Command" shows "Prepare" or "Execute" for "Show Full Processlist" Any example which shows this would be helpful.
1
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1answer
967 views

Slow insert with MySQL full-text index

I use a full-text index in a MySQL table, and each insert into this table takes about 3 seconds. It seems that MySQL rebuilds (a part) of the full text index after each insert/update. Is this right? ...
2
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1answer
44 views

How do I guarantee inventory numbers are unique across all tables?

I have an assortment of physical objects which need to be inventoried and each type of object has it's own table. For two example objects, let's use 'swords' for the table containing different swords ...
0
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1answer
185 views

duplicate entry issue with large mysql database table

I have a very large my sql database table. The other day, for no apparent reason, I now keep getting :- Duplicate entry '148245' for key 'PRIMARY' If I remove the entry at with primary of 148245, ...
0
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2answers
190 views

Best configuration for MySQL? InnoDB and MyISAM

I read that InnoDB is supposed to be better at writing into MySQL than MyISAM, however, I'm trying it out, by running 3000 MySQL queries(Inserting rows, 8 Columns + id)... but results haven't turned ...
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0answers
23 views

import TSV file into mysql table with SET datatype column

Is it possible to use LOAD DATA INFILE to load data into a mysql/mariadb table, where one column uses the SET datatype? If so, how do I specify the separator for the individual set elements?
3
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2answers
58 views

MySQL is trimming my numbers and I can't figure out why

I've got a table with a bunch of decimal(12,2) fields that are supposed to hold money amounts. For some reason which I can't figure out one of them is trimming the value when either inserted or ...
1
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1answer
138 views

Mysql Partitions with Partition limit

I have a partition table on basis of Primary key having 1.5 Billion rows in it. But when i check ibd files only 80 ibd show in GB's whereas 120ibd shows 1MB file. I would like to know how does the ...
0
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1answer
42 views

Generating 50k rows of unix time entries auto-incremented 5 mintes each

I am relatively new at using mysql, or any DB for that matter, so let me know if I'm doing this in a round-about way. I have 4 similar tables with two rows columns each - unixtime + count. They all ...
0
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2answers
239 views

Remove duplicates from multiple joins

I'm using WordPress $wpdb->get_results for this query (it is simplified for question purposes): SELECT customer.id, customer.name, address.address appt.appointment_date, pay.date FROM customers ...
0
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1answer
473 views

Exclude IP from being blocked by MySQL

I have a mysql server running. Due to the uptime is not perfect, sometimes the HTTP server is blocked when mysql server is down intermittently. Host 'host_name' is blocked because of many connection ...
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2answers
932 views

Why am I seeing `ERROR 1290 (HY000)` when altering my table?

When I run the following statements on my test_date table, I get error ERROR 1290 (HY000): desc test_date; +------------+-----------+------+-----+-------------------+-------+ | Field | Type ...
38
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3answers
45k views

Why does InnoDB store all databases in one file?

It was convenient that MyISAM used to store each table in a corresponding file. InnoDB has made advancements in many aspects, but I wonder why InnoDB stores all databases in one file (ibdata1 by ...
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2answers
1k views

how to connect mysql database in my vps from remote machine?

I have installed mysql database on my vps ip, and input the following command when to login mysql. mysql> GRANT ALL PRIVILEGES ON . TO 'root'@'%'IDENTIFIED BY 'passwd' WITH GRANT OPTION; mysql> ...
0
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1answer
104 views

Delete duplicate with same ID PHP/PDO/MYSQL

I'm new to databases and I need your help I'm working on a website and I have few problems. I'm using PDO. There is a user table, with unique ID, name and password. User enters his username and ...
0
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1answer
158 views

change character set in mysql permanently

I want to change following parameters to utf8mb4 so that mysql can store emoji characters and special language characters. but when i try running following statements one by one SET ...
1
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1answer
124 views

High data traffic from MySQL server to web server

I have one webserver running Magento : Community Edition 1.7.0.2 and a separate machine with MySQL 5.5.42 on it. Both machines are EC2 instances. I am seeing huge unexpected data traffic from the ...
1
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1answer
987 views

MySQL cluster error: “Got error 4009 'Cluster Failure' from NDB. Could not acquire global schema lock”

I am trying to configure MySQL cluster under three Windows 7 machines with disabled firewall, cluster information is like the following: 2 hosts with each running 1 data node 3rd host running ...
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1answer
677 views

Issues with MySQL installation

First of all, excuse the length, this post is very long, and needs some background, second; it has been hard for me discerning the signal from the noise, please bear if some of this is not relevant: ...
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1answer
1k views

How can I select data from two differents servers?

I have two databases: data1 and data2 in two different servers (server1 and server2). I am trying to join two tables of my two databases in MySQL like this: SELECT left(a.code,9) as fourn, ...
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3answers
30k views

How to make MySQL table name case insensitive in Ubuntu?

I am using Ubuntu 13.10 and MySQL 5.6 and I know database name and table name are case sensitive in Ubuntu (and some other *nix environments) by default. Now, I want to make MySQL work as case ...
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2answers
1k views

Restore InnoDB to different machine

It was pointed to me from serverfault that the following question would be a better fit here so this is basically my original question from there. I currently have backups that were taken with ...
0
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1answer
374 views

MariaDB Galera cluster nod won't start

I have configured a MariaDB Galera cluster with three nodes. The master node and one slave-master node is up and running, but the third node just won't run. The system specs and cluster config are the ...
0
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0answers
160 views

MySQL along with Firebase for data sync

I'm currently working on a mobile app powered by a web platform, and the mobile app will have some offline capabilities. The application has a small amount of DB entities, and only about 3 of them ...
4
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2answers
10k views

MySQL got signal 11 error and slave is down

My slave server is down and mysqld unable to start. What should I do? Below follows the error logs: 2014-09-26 12:51:53 14166 [ERROR] InnoDB: Unable to lock ./ibdata1, error: 11 2014-09-26 12:51:53 ...
2
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2answers
778 views

tmp_table_size with mostly InnoDB tables

I use MySQL version 5.6.25-0ubuntu0.15.04.1 on 64-bit Ubuntu 15.04. I have 2GB RAM and the disk is SSD (so, in my mind, writing to disk isn't that costly). I currently have databases for just two ...
0
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1answer
34 views

DB Design - 1 column for each dataset OR dataset_name AND dataset_value?

I am creating a database table for storing numeric time-series data sets regarding cities that will be accessed via a web app. Primarily annual, quarterly and monthly data will be stored in it. ...
1
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1answer
141 views

Is my shopping list database schema good enough?

I'm wondering if my schema is correct? It's intended to hold shopping list items for each user, a user belongs to a household. Items will be added to the household. The stocklist will to hold the ...
0
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1answer
19 views

Result consisted of more than one row in procedure

i confused with this i try not using cursor and same get error so i back using cursor but before this day my query success and can generate but this get error please help me i already look other ...
3
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2answers
74 views

Need help improving sql query performance

I have this table: CREATE TABLE `property_ads_history` ( `id` int(10) unsigned NOT NULL AUTO_INCREMENT, `property_ad_id` int(10) unsigned NOT NULL, `advertiser_type` varchar(255) COLLATE ...
1
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2answers
172 views

9000 rows affected message, but no rows actually changed

I'm having a problem with MySQL. When I run the code below, via phpmyadmin: UPDATE wp_posts SET post_content = REPLACE ( post_content, '31.media.tumblr.com/', ...
4
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1answer
542 views

Partialy Solved - Problems Deleting Data

I did a workaround that solved the problem for today but I want to know what I did wrong for the next project. I'm stuck on trying to delete some information on my MySQL database. I've never used a ...
1
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1answer
37 views

InnoDB: secondary key that's 'parallel' to primary--do joins wherein the resulting primary keys are contiguous perform better?

Say I have a table ( person_id INT AUTO_INCREMENT, birthday_timestamp BIGINT, country, state, ..., PRIMARY KEY (person_id), KEY (birthday_timestamp) ) where people are added the instant ...
0
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1answer
53 views

Simple SQL question [closed]

I'm try to resolve this but I don't understand? My query Select FirstName, City FROM Customer WHERE City NOT IN ('Paris') Error Your answer does not contain the expression <>
3
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1answer
195 views

Mysql join table order by index

First Master Table CREATE TABLE `edipostingmaster` ( `ID` bigint(20) NOT NULL AUTO_INCREMENT, `applied` int(11) DEFAULT '0', `fileName` varchar(255) DEFAULT NULL, `checkNo` varchar(100) ...
2
votes
1answer
690 views

How to improve the performance of SELECT queries with multiple JOINs on a 50GB database hosted on AWS m3.medium MySQL RDS?

Example query: SELECT p.ListAgentEmail, p.ListAgentFirstName, p.ListAgentLastName, p.ListingKey FROM Property_RES AS p INNER JOIN Property_RES_COUNTIES_OR_REGIONS ON ...
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0answers
29 views

Access denied when trying to use Mysqlimport Utility (using Root Credentials)

We are trying to import large CSV files through Mysqlimport as described in This & This article. But even though I am using root credentials I keep getting the following error: mysqlimport: ...
0
votes
1answer
117 views

MySQL database got corrupted

It seems that whenever I restart my Windows 7 64bit box MySQL gets corrupted. I just wanted to make this bug known as it's a serious issue. Are there any special settings I need to setup (task ...
0
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3answers
18 views

replicate data from one db to another db server using automated process

I have an scenario, I have two DB server running on two different machines. I have to build an automated process by which the data will replicate from one DB to another DB server on every insertion ...
0
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4answers
55 views

How can I use MySQL variables in subqueries?

I'm trying to run the following query, but it keeps getting "reduced" and failing. Cannot get MySQL to provide any information as to why. Here's the query: SELECT * FROM animals WHERE name IN(SELECT ...
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0answers
25 views

MySQL Return average for every unique id per day

I have a table: Unique ID, DeviceID, Temperature, Epoch And 3 sensors (DeviceID's) sending temperature every minute to the database. I would like to select to return AVG(Temperature) for every ...
1
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1answer
233 views

Query multiple rooms with different conditionals (Adults, Children)

I have a simple query where I select available x Rooms with x Adults + x Children per hotel that matches a date range, but I'm having a hard time trying to figure out how to query a list of rooms per ...
1
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2answers
119 views

MySQL Junction Table as Foreign Key?

I have several tables: company, customer, company_has_customer, and transaction. company_has_customer is a many-to-many junction table using the PKs of company and customer as its PK. In almost all ...