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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58 views

Are there any risks on using 'single-transaction' and 'extended-insert' on mysqldump?

I'm new in db administration and I've looked for a faster import of a mysqldump. I had a db with about 1.1 million rows and mostly InnoDB tables and wanted this to import on a managed server. Before ...
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32 views

subquery in set clause retrieving different values

I want to update the column "kstplcode" using different values coming from column warehouse except the value "main" with their corresponding delivery numbers. I've tried this code but the set clause ...
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59 views

Column based replication in mysql 5.6

I want to do column based replication which means: In my server, I have table T1 in which columns are A, B, C, D, E I want to replicate this table on different server in mysql 5.6 only, but with ...
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1answer
36 views

Unix timestamp conversion

How can I output my Unix timestamps to human readable GMT? SELECT category ,fullname ,shortname ,idnumber ,startdate ,visible ,timecreated ...
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81 views

MySQL sudden restart

I have a strange issue with my MySQL server. It suddenly restarts. It's a rare but very big problem for me. This server is running as Master in Master-Slave replication. I'm using MySQL ...
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22 views

How to reorder again' auto increment column' after deleting some rows [duplicate]

I have a MySQL db table, and first column is for id which has auto_increment. I want the first column be reordered after deleting some rows. iIs there any way to do that? id name 1 alex 2 ...
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324 views

MySQL Aborted connection warning messages

I am using "5.6.22-log MySQL Community Server (GPL)" MySQL server. All the tables in my servers are using Innodb storage Engine. Below is the configuration of my server: [mysqld] ...
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1answer
72 views

Hash index for InnoDB

I saw a database schema that looked like this CREATE TABLE foo ( name_hash bigint, name varachar(500), a varchar(500), b varchar(500), ... PRIMARY KEY (name_hash), KEY ... ...
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17 views

MySQL(/PHP) - Selecting a list of all children [duplicate]

We have a store with a hierarchical set of categories. The table looks like this, where parent_id is the categories_id of the parent category (0 is toplevel): mysql> describe categories; ...
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47 views

Index pages in innodb file when innodb_file_per_table = ON

I have MySQL 5.5, and innodb_file_per_table was always in config file. After some time of using MySQL DB was produced big ibdata1 file, but i don't know how explain why this file is so big, i try to ...
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228 views

PostgreSQL -> MySQL Migration with MySQLWorkbench

I'm trying to migrate data from a PostgreSQL DB to a MySQL DB (it's for permissions in the VPC, so please nobody link me the 'choose-something-else'). I'm getting this error from MySQL Workbench when ...
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67 views

Why binlog capture only postions

Please help me out, why master server records only position not statement. ### INSERT INTO `sanma`.`response` ### SET ### @1=743096223 ### @2=0 ### @3='IR' ### @4='UnderProcess' ### ...
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309 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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24 views

mysql Function not picking up parameter

I have written the following function: DECLARE thetotal INTEGER; select count(stock_current.EntryNo) INTO thetotal FROM stock_current WHERE (stock_current.PartNo = thepart) AND ...
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127 views

MySQL: Replication is paused with both threads running, System Lock in ProcessList

I have just set up Master Slave replication from a MariaDB EC2 instance to a MySQL RDS instance. What can I do? The Seconds_Behind_Master are increasing, never decreasing. Slave_IO_State Waiting ...
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2answers
503 views

Counting on Two Different Columns in the Same Table

I run a pool league and have kept stats in Excel. I want to automate via a website and MySQL will be my primary data analysis tool, though my knowledge there is only at the beginning of a long ...
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2answers
54 views

Master Master replication not working showing

error from master 1 Last_SQL_Error: Error 'Cannot add or update a child row: a foreign key constraint fails (stylanzo_live.report_viewed_product_index, CONSTRAINT ...
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42 views

making everything varchar on purpose, though some fields should be int

I'm writing a PHP website for some clients which parses excel, stores the value in a database and then retrieves them. Some fields are only integers, but the clients can't make up their minds, they ...
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2answers
40 views

Partitioning visitor logs database

I have set up a table that logs every page view a visitor makes. This is going to result in a table with about 50,000 entries per week. To keep things manageable and performing well I am intending on ...
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150 views

MySQL Workbench error: Attribute error 'nonetype' object has no attribute 'parameterValues'

I am trying to export a database but i don't have access to "server administrator" at all... everytime i try to do something from Server administration i get the message mentioned in the title. What ...
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414 views

MySQL Transaction with rollback upon @@error

I have done several transactions with MySQL but mainly using php's libraries as the handle. Using php you would have something as: $pdo->beginTransaction(); $pdo->execute(' query1; ...
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2answers
187 views

MySQL Server > 90% memory consumption

I have a fairly large (16 vCPU / 47 GB of RAM) linode box which hosts a running MySQL Server. This box currently does nothing else (and we are not planning to install anything else on it for now). ...
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47 views

Update a field in table when a combination of three fields with a second table is matched

I have a database form an old archaeological project which I imported into a mysql DB. I have a table "graves" with 400+ entries: "graves" id necr burials single multi 1 1 1 ...
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74 views

Role based access control protocol for resources in mysql database

I have a mysql database for an application which contains users and resources, like for example books, movies, tv-shows and music. Users should be able to view and edit specific entries of this ...
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1answer
33 views

pt-table-checksum toolkit for few databases from file

I've got a question. I'm doing a simple script right now and it isn't working like I want. #!/bin/bash cat /etc/backup.conf | egrep -v "(^#.*|^$|^--.*)" > /tmp/databases while read ...
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62 views

DB Design for Mobile App Clients

Hello I am new to designing DB for Mobile App where speed is the Key. My Mobile App will request to WebAPI and WebAPI will get data from MySQL. I have designed my tables in MySQL as per relational ...
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3answers
94 views

Initials separated by periods (e.g. J.E.F. Smith)

In a MySQL database I have a column that holds the initials of a person. However not all input is nice and clean. To give an example the initials for the name John Edward Fredrick Smith should be ...
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3answers
37 views

Alternating usernames while connecting to mysql database

My server has a max_connections value of 400 and a max_user_connections of 250. Since I am always connecting with the same user name, my effective max_connections is 250 instead of 400. To solve this, ...
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1answer
25 views

MySQL group concatenation - creation of insert statement on temp table

I have a temporary table TEST_GROUP, from where I'm working its data to fill another one. From this table, giving the example in the picture, my expected result is to group these three rows, so I ...
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1answer
72 views

How many database users/admins should be created for a website?

I have created a CMS website that only had one database connection for both the admin area and the user area and it only had one user("root") with no password, and now I want to upload it, but I am ...
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1answer
38 views

Selecting distinct records having multiple properties

For following table data: ID | Property ================= 1 | Sweet 2 | Sweet 2 | Sour 3 | Hot How can I get the ID's having Property Sweet AND Sour (in this example, 2) ...
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3answers
128 views

Merge MySQL tables without data repetition

My situation is this: I have several DIFFERENT tables in my MySQL database with the same name columns. Such tables can contain (or not) the same data. What I need to do is a kind of "merge" between ...
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49 views

how to use a specific column for a day

CREATE TABLE `csptargets` ( `id` int(11) NOT NULL AUTO_INCREMENT, `start_date` datetime NOT NULL, `end_date` datetime NOT NULL, `cspcode` varchar(11) NOT NULL, `vol`decimal(20,3) NOT NULL ...
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1answer
26 views

What are the type of drivers for Communication with Java?

I am developing one application using core java and Mysql Database. As i read in Most of the site, they suggest that use type 4 driver for communication using JDBC. In JDBC Connection i have use ...
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1answer
46 views

mysql Quiz leaderboard filter by points, time taken

I have a quiz report table which shows a report for every quiz a user takes. I need to create a leaderboard from this, which shows the top users best score, filtering by points and then time taken. ...
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220 views

Ideas for Database schema for Automotive web app

For the last couple of days I have been searching all over Google for database schema for my automotive web application [like a marketplace of sort] (in Laravel 5 PHP). I have tried many models some ...
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55 views

Outer left join with WHERE loses row

The line below MUST be in query or the null rows when joining are dropped. Why is this? //If I don't add this line; I lose rows where items.name IS NULL $this->db->or_where('items.name ...
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133 views

MySql Innodb Database Slow INSERT Query to Remote Server

I have searched thoroughly on how to improve general performance of my database which is hosted on Hostgator. I have mostly come across performance tuning strategies which are catered to only local or ...
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69 views

how to do a backup and restore for a single database with mysql enterprise backup

I am Chinese, the documentation of mysql enterprise backup is hard to understand for me, and now I need to finish my job quickly, I wonder is that possible to backup a single database and restore it ...
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31 views

hashed password retrieval in mysql

here I am again with the next question! I hash a password as follows: mysalt=os.urandom(12).encode('hex') passhash =mysalt + pw hash =str( pbkdf2_sha256.encrypt(passhash)) How can I verify this ...
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35 views

What could cause 300+ connections from a simple query in MySQL?

I am retrieving results from a table in MySQL 5.5. When I run even a basic query on this table hundreds of connections are shown in the Server Status screen in MySQL Workbench. Even for a simple query ...
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45 views

Post categories model for a user submission wedbsite

I'm building an user submission site where users can make posts to content_types: Blog, Movies, Photos, Forums. Since these content types only have slight variances I would like to keep them in one ...
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27 views

Filesort when using view

I am sorry for asking, but I can't figure what i am doing wrong and filesort appears in my explain. The id column that I use for sorting in the following examples is a primary key... If I create ...
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1answer
42 views

Optimized ways for defragment mysql database table

We have a database in MySQL which has more than 500 GB of data, and currently in the process of purging data and count might go beyond 1 million. As we know that purging might lead to high ...
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25 views

MySQL Pivot table

I have a MySQL table with following columns ZipCode PartNo Price DateCaptured Example data rows 50070 |P1234 |57.90 |2015-05-05 05:05:05 50070 |P1235 |58.90 |2015-05-05 05:05:05 ...
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58 views

Mysql trigger on insert on another table

I have three tables all three have [product_id] column, what all i want to do is when there is new entry of quantity of respective [product_id] in table A and table B i want show the sum of the ...
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1answer
119 views

Removing per column and table collation and charset

I recently completed a transition of a database from CHARSET=utf8 COLLATE=latin1 to CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci. During the process tables were migrated one at a time by altering their ...
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44 views

insert/update query running slow to specifi tables

I am monitoring MySQL client connections and queries run time. Found some insert/update queries to specific tables are slow than expected. I know the tables which are slow are big in size > 600K, i ...
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40 views

Searching & deleting content that starts & ends the same, but has random text in between

So my Wordpress sites been hacked & spuriously created a load of content in the posts which starts with & ends with . The only trouble is that the bit in between is random hyperlinks. Any ...
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1answer
122 views

What is wrong with the following Python code — trying to insert into a database?

This works in MySQL Workbench: insert into nametest (name,surname) values('John''Krailling'); I am trying a get similar result with Pycharm with the following code: import MySQLdb db = ...