MySQL : Open-Source, Relational Database Management System

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How to run a mysqldump from a .txt or .sql file inside a command line window?

If I run the follow line directly in command line window it will works good. C:\xampp\mysql\bin>mysqldump -u root d3bi>C:\Users\me\Desktop\test\testDump.sql How can I run a .txt or .sql file ...
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13 views

manual transfer fails with table does not exist

I performed a manual transfer of data manually (zip up the dir and rsync'ed it over. I moved the members.ibd (the only .ibd file) to a save place, extracted and then replaced members.ibd with the ...
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14 views

Error when creating multiple tables at once

I'm using mysql through the CLI in OS X. The problem I'm having, is that when I create multiple (more than 3 in this case) tables, I receive errors, but if I enter the code, 3 tables at a time, I get ...
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16 views

Create a default value for session valid_until MySQL

Server version: 5.6.22 Homebrew The table: CREATE TABLE `sessions` ( `id` bigint(20) unsigned NOT NULL AUTO_INCREMENT, `user_id` bigint(20) unsigned NOT NULL, `date_created` datetime ...
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2answers
50 views

Schema review for system to advertise cars

Ok, so I am carrying out a rather simple task as part of a job requiretement. Here is the task in a nutshell: Design a form for creating ad for selling car Form has 2 have: 2 drop downs: Car make ...
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30 views

I have a table from which I can retrieve information but I cannot update or delete information

I can update and delete items via PhpMyAdmin. I changed the owner to mysql. My program is a clone of insert, update, and delete that is functioning for other tables within the database. I receive a ...
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2answers
70 views

Retrieve total available days in date range compared against multiple records

Given the following MySQL database structure for a booking system, how can I retrieve all available days between two user supplied dates? | ID | code | date_arrival | date_departure | 4 | APT01 | ...
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11 views

Amazon RDS, I can't login to db from other computers [closed]

I'm having issues with connecting to mysql db hosted by amazon (trial). I have written application that connect to my db. Everything is fine when I connect from my pc but when my friend tryed to ...
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2answers
735 views

Why are mysql password hashes internally saved with a star (asterisk)?

I was reading upon some mysql internals, when going through the mysql.user table in the my mysql shell, I get mysql> select * from mysql.user limit 1 \G *************************** 1. row ...
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1answer
27 views

how to cache a subset for cascading select queries in mysql

Here is another database problem I stumbled upon. I have a date-range partitioned MyIsam look-up table with 200M records and ~150 columns. On this Table I need to perform cascading SELECT-Statements ...
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36 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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74 views

Select only rows that equal x but not x and y?

I'm having quite the challenge with selecting hierarchical data in mysql although I feel the schema should be optimized for it since it's based on the wordpress database model. I've got 4 tables... ...
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1answer
26 views

What MySQL activity eats CPU? [closed]

I have noticed weird CPU consumption peaks for MySQL process. When I monitor running queries, it's empty or some reasonable queries being executed. How do I better address the problem? Is there a ...
1
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1answer
17 views

Is it safe to disable InnoDB doublewrite buffering when setting Innodb_page_size = filesystem page size?

As I understand, doublewrite buffering is needed to avoid partial write, because Innodb_page_size default is 16K, while filesystem page size normallly is 4K; I wonder if I set "Innodb_page_size = ...
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10 views

MySQL Cluster 7.4.6 - Analyze table failure on 15m reference table

I'm running MySQL Cluster 7.4.6 on Azure VM's with the following infrastructure: 2 x Mgmt Nodes: Ubuntu 14.10LTS, 2 cores, 3.5GB ram 2 x MySQL API Nodes: Ubuntu 14.10LTS, 2 cores, 3.5GB ram 2 x Data ...
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manual data migration/rescue MySQL version: 5.6.23

MySQL died and could not be started. So I transferred my database files via rsync to another server and restore from back up. Now I am trying to access my data with my updated records. mysql> use ...
2
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2answers
43 views

MySQL taking too much CPU

Below is my .cnf file and if I see my CPU consumption 99.99% of it my the mysqld commands. The MySQL server is connected from remote machines that update data in it frequently, but I make sure that ...
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1answer
48 views

Does my ERD look well designed?

I am making a database at no cost for a local dance school. I'm still very new this would like to be sure that I designed it appropriately. From the front end, the parent will: fill out their ...
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22 views

How to solve “Can't connect to local MySQL server through socket” error?

I kept getting this following error every time I tried to restart MySql. It was working fine before I changed the default data directory. ERROR 2002 (HY000): Can't connect to local MySQL server ...
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1answer
22 views

Does it makes sense to partition on a foreign key?

I have a MySQL table which looks a bit like this: ID (BIGINT, PK), OtherID (INT, FK, indexed), NegativeTimestamp (BIGINT, indexed) Selects should go very fast, updates almost never happens, inserts ...
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15 views

SQL Insert with HTTP1.1 [migrated]

Sorry for an amateur question but I have no idea why this does not work. I have a "add.php" to connect to the SQL server <?php include("connect.php"); $link=Connection(); ...
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31 views

Why does “DELETE WHERE (VARCHAR)=0” execute successfully?

DELETE FROM stats WHERE name=0 "name" is type VARCHAR(64). The above resulted in all records in the table being deleted, instead of just the 10~ that should have been affected. Only that many were ...
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23 views

Designing multi-table notes

I have several tables (Providers, Items, Users) representing items that my users can comment on. In the OO mindset, if the above tables were classes, they would each be a subclass of Commentable, ...
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3answers
40 views

How to retrieve all data from table if column value providing null value?

How to write a query: If country = ' ' I need to display all data in table. If country='algeria', it will display the particular data. I need both queries in a single query. I am getting result, ...
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48 views

Scalability question

There is a DB {MySql} with 5 tables A, BIG, C, D, E. Their grow factor is about 1/100/1/1/1. The table BIG has Insert/Read/Update request ratio about 1/10/2. The Inserts and Updates 'cannot fail'. ...
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Need to make MySQL's LOAD DATA LOCAL INFILE load large data faster

I need to load 4 million rows of data into a MySQL InnoDB table using LOAD DATA INFILE and would like to know if there are server configuration options I can tweak to get faster load. It took me 15 ...
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1answer
24 views

How can I create a mongo db based on mysql squema?

How can I create a mongo db based on mysql squema? this is my schema productCode VARCHAR(15) productName VARCHAR(70) productLine VARCHAR(50) productScale VARCHAR(10) productVendor VARCHAR(50) ...
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21 views

Cant Import mysql system DB from another server

Both Servers are the same in hardware, OS, and MySQL versions (5.6.11). One server has MySQL on it and on the other one I just setup a fresh instance. I want to import all of the data to the second ...
2
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1answer
32 views

Strange Availability Problem with MySQL

I am trying to troubleshoot an e-commerce site problem that seems to be database related. In my investigation so far, I noticed that the server seems to have an unusually high numbers relating to ...
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2answers
27 views

Best way to implement concurrent table based queue

I have a table in MySQL that represents a queue of links to be processed. The links are processed by an external app, one by one, and deleted in the end. This is a high volume queue and I have ...
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Explain unexpected result in MATCH () AGAINST ()

I have a database with a fulltext column name. I made a query SELECT name, MATCH (name) AGAINST ('breaking bad') AS score FROM files WHERE MATCH (name) AGAINST ('breaking bad'); So that I can see ...
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2answers
59 views

How to update a multiple rows all at once with a procedure.?

Im trying to do a procedure to update an (for now) empty column recently added. In this new column, i will put the values of the result obtained by a join query. To explain it better, i have this ...
2
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1answer
37 views

How to move a 80GB MySQL Database with least effort and least time offline?

Im a software developer with 4 years experience but brand new in my company, my first job is to move a 80GB mySQL database from a very very small and old database server to a brand new. The problem: ...
2
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1answer
20 views

Using the output from mysqldiff.exe to transform database2 to match database1

This question is related to another I had asked earlier here: Passing passwords more securely to mysql utilities on the command line. I have recently been trying to use mysqldiff.exe, part of MySQL ...
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10 views

how to design Multilevel and multiuser application database schema [closed]

I am developing an event management application with the user roles like super admin, admin and user. I want to design database in the way that only superadmin can login and create admins of ...
1
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1answer
15 views

if set global transaction, how can I commit?

I found that MySQL can set a global transaction, but can I commit in another session? refer: http://dev.mysql.com/doc/refman/5.6/en/set-transaction.html
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2answers
31 views

Whats SQL Server NVARCHAR(max) equivalent in MySQL?

Using SQL Server you just have to give the "MAX" parameter to the length of a text data type, but in MySQL there's no such a thing. According to Ispirer: "n" is the maximum number of characters, ...
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1answer
16 views

Calculate total attendance for each workshop

I want to get overall attendance in each workshop. NumberOFWeeks column holds the number of weeks the workshop runs. for example Workshop 101 runs for 6 weeks meaning 6 days. So far I have done ...
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1answer
43 views

Using a subquery in a LIKE statement

I need to write a subquery inside a LIKE statement. This subquery would return me a word that I need to find in the middle of a sentence (that belongs to another field). Is it possible? This is how ...
0
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2answers
36 views

Passing passwords more securely to mysql utilities on the command line

This question is related to another question I subsequently asked here: Using the output from mysqldiff.exe to transform database2 to match database1. I have been trying to use mysqldiff.exe, part of ...
1
vote
2answers
36 views

Database design for multiple user attributes

I am building an app with Laravel, and I have users which also have a profile. I am unsure about the best way to set up the database for the user attributes. For example: user_ud | name | ...
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44 views

Mysql 5.6 very slow on windows server 2012 compared to other platforms [closed]

The below command takes 2-3 seconds in a Linux MySQL 5.6 server running Php 5.4. Also on windows 8. mysql --host=$db_host --user=$db_user --password=$db_password $db_name < $sql_file On windows ...
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MYsql/PHP - max_user_connections

I sometimes have an error where I have reached my max_user_connections. My hosting company does not want to increase it further. If I create an additional user, and 50% of the time connect to that ...
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2answers
41 views

Refer to renamed columns in WHERE clause

SELECT name, gdp/population as capita FROM world w1 WHERE continent = 'Europe' AND capita > ( SELECT gdp/population FROM world WHERE name = 'United Kingdom' ); How come I ...
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1answer
41 views

create table from another table

I have master categories table like this category_id category_name parent_name parent_id 1 animals & pet supplies null 0 2 ...
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6 views

How to calculate sum of a column in a table accessed with multiple joins and where condition

I am unable to find correct sum of vaccinated based on campaign id. no matter which campaign I choose to get sum of vaccinated on the basis of that campaign id it always returns the same data. Please ...
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24 views

best way to store tags

I'm a university student building a web application for a project with three collegues , I took the database portion. Our site is basically a link sharing site and supports tags, what is an efficient ...
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13 views

Fetch data from second table based on first table [migrated]

I'm new to the world of databases and I've just started making my first DB powered site with php and MySQL. I've got it working with data from one table but now I need to get a url to the users ...
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indexable JSON datatype in MySQL/MariaDB

In PostgreSQL 9.4 there is a JSONB datatype which allows you to index on fields in the stored JSON objects. Does MySQL/MariaDB have an equivalent? I'm specifically interested in the MariaDB Galera ...
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1answer
19 views

MySQL 5.6 upgrade - reducing code changes / developer burden

Does anyone know the key things that should be done when moving to MySQL 5.6 to reduce the amount of code changes required? I found that new installations of it have STRICT_TRANS_TABLES set for ...