MySQL : Open-Source, Relational Database Management System

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0
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2answers
32 views

insert into select with union needs derived table

Why do I need to do another select when I am trying to insert distinct values into a table? Also: is there a better way to do this? WORKS: INSERT INTO phppos_categories (name) SELECT category FROM ...
2
votes
1answer
732 views

SQL set profiling

I'm setting up an automatic database backup for a website. When I try to do a backup it comes up with the error" MySQL error: The 'SHOW PROFILE' feature is disabled; you need MySQL built with ...
0
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2answers
2k views

Mysql Server Login and Permission Deny Error

I have a problem with MySQL server. After upgrading MySQL server from 5.3 to 5.4, I am not able to log-in using my MySQL root password (Yes, I am able to log-in without password!). Also not able to ...
0
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1answer
44 views

Slow “CREATE TABLE” and “TRUNCATE” on MySQL / MariaDB

I am fighting with performance issues on a local MariaDB instance. Fun thing: I previously had problems with all my INSERT and UPDATE and DELETE queries. This got signigicantly faster (~40ms -> less ...
5
votes
3answers
2k views

MySQL Workbench Tabs refuse to close

I'm using MySQL Workbench 6.1.6, and I have opened a SQL Editor Window and have 14 Query tabs open. If I close the connection, and then open the connection again from the Home page it reopens all 14 ...
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0answers
9 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 ...
5
votes
1answer
337 views

Deadlock free MERGE-alike in MySQL?

I am trying to implement some parts of MERGE in the MySQL driver in Drupal. Of course, Drupal has something but in truth it only works because the most frequent MERGE issuer just eats exceptions. So, ...
0
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2answers
25 views

how to store mp3 files in mysql database by using phpmyadmin?

first of all i am new to database, but i want a database for my site to store mp3 files in it so later i play them on my site by using jplayer. little though i know about database they said there are ...
0
votes
1answer
280 views

How to automatically Reset Query Cache for improve table cache hit in MySQL?

I have a VPS running CentOS 6.4 and 2.5GB RAM, Intel(R) Xeon(R) CPU. Its MySQL version is Server version: 5.5.35-cell. I have two active wordpress sites and two inactive sites (inactive sites use for ...
1
vote
2answers
28 views

Optimal engine for small lookup tables in MySQL

I have following question: I am designing web application with several dozens of small lookup tables: These tables usualy contain three columns (ID, Name, Description) and a couple of rows (mostly ...
2
votes
1answer
36 views

Query to flatten schema

I have the following tables and columns: Users id | other-non-important-columns Containers id | Users_id | other-non-important-columns Content id | Container_id | other-non-important-columns ...
1
vote
1answer
248 views

Design advice regarding a users/groups/tasks database scheme

Here are my requirements: one user can have many tasks one group can have many task one group can have many users only invited user by a user can be added into a group Does this db design appear ...
1
vote
1answer
595 views

MySQL (or MariaDB) multi-master without MMM

I've been reading blogs on MySQL multi-master setup. The way I've used MySQL replication in the past was master-slave where if the master died (or was being taken down for maintenance) we would shut ...
0
votes
2answers
354 views

MongoDB/MySQL - auto increment vs object ID

I am in the process of evaluating MongoDB and writing some basic PHP applications around it. Typically in my PHP/MySQL applications, I would create an ID field and set it to auto-increment on each row ...
2
votes
1answer
15 views

How MySQL Queries and Questions status variables are calculated?

I have a mysql server running on 5.6.19 version and I got confused with the status variables Queries and Questions. show global status like 'Queries%'; | Queries | 28058738 | ...
1
vote
1answer
20 views

How to get row count from all tables of a schema ( without using information schema )

The query should collect data from table name , schema name from information.schema and row count should be taken from actual table.
0
votes
1answer
182 views

SSIS Dataflow Task issue, moving data from SQL Server 2008 to MySQL via ADO.Net

Can you please help me in getting this problem solved.. I'm trying to build a SSIS package where I'm moving the data from SQL Server 2008 to MySQL. However I'm getting a weird problem in dataflow ...
0
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0answers
16 views

Need some help building a query to get info from several tables

I have this semi-complex table structure: And I need to return this data: { "id": "10111001", "rep_id": "30000001", "targets_id": "60011001", "brands_id": "10010001", "brand_name": ...
0
votes
0answers
13 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 ...
1
vote
2answers
6k views

MySQL - Autoincrement does not increment sequentally if last row was deleted

I have a table which contains an auto incremented primary key id. If I delete the last row (highest id, for exampe id = 6) and insert a new row, the new id starts at 7. Which paramater I have to ...
0
votes
1answer
309 views

MySql - Reorder primary key with auto-increment [on hold]

I have two tables in MySQL as follows: CREATE TABLE UserMst ( UserID mediumint(8) unsigned NOT NULL AUTO_INCREMENT, UserName varchar(20) NOT NULL, CreatedOn timestamp NOT NULL DEFAULT ...
1
vote
1answer
240 views

I need advice on these queries

could you help me optimize these queries? here are queries, please note that you see something like OR 1=1 OR those are values I pass via php and may change. query#1: SELECT posts.status, ...
1
vote
3answers
11k views

Xampp 3.2.1 error: MySQL shut down unexpectedly

I logged into Xampp today and it wouldn't launch MySQL. It said there was an error and it shut down unexpectedly. Here are the errors from the error log. Hoping someone has seen this before, ...
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0answers
15 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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0answers
22 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 ...
0
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1answer
19 views

How to insert UNIQUE IDs values from several tables into events table

I have a table called events defined as follow: rep_id, hcp_id, brand_id, email_id and content_id is the IDs in other tables. event_type should be kind of array containing this values: [ ...
0
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2answers
1k views

Improve MySQL Query Performance - Too many records

I am using MySQL RDMS for a contact management system. Now a days my database grew in size and contains more than 1 million records. Checking duplicate phone numbers became a big issue during ...
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0answers
8 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 ...
0
votes
1answer
27 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 = ...
2
votes
1answer
63 views

How to write a query, with multiple foreign key in mysql

I am working on a simple PHP and MySQL college level clinic management system. There 4 main table which relation with foreign key. I'm little bit confusing multiple foreign key in table .. what would ...
0
votes
1answer
130 views

MySQL General error: 126 Incorrect key file for table '/tmp/#sql_27e6_0.MYI'; try to repair it'

I have a table in MySQL with ~2,000,000 rows. When I try to select all records, it exhausts the system's memory and I get an error about memory exhaustion back. When I try to use the MySQL LIMIT and ...
0
votes
1answer
15 views

Function for generate a huge and possible random relationship between tables

I have this two tables and N:M relationship between them: Let's said I am managed to create a lot of media and emails records but I need to create the relationship between them. I can do this ...
1
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1answer
23 views

MySQL 5.6 Slaves Fail to Reconnect to older MySQL server when it goes down for backups

I have an existing replication setup with Masters and Slaves running MySQL 5.0. A long existing script runs at night which restarts MySQL on the master with skip-networking, runs a backup, and then ...
-2
votes
0answers
8 views

PMA-SQL-ERROR while importing databse in xampp [on hold]

While importing database in xampp i am receiving following errors SQL query: <!-- PMA-SQL-ERROR --> <div class="error"><h1>Error</h1> <p><strong>SQL ...
3
votes
3answers
8k views

Error while restoring a Database from an SQL dump

I am extremely new to MySQL and am running it on Windows. I am trying to restore a Database from a dumpfile in MySQL, but I get the following error: $ >mysql -u root -p -h localhost -D database ...
2
votes
4answers
13k views

Broken mysql replication on slave server (error 1236)

My question is: how to fix broken mysql replication on slave server (error 1236)? server 1 (192.168.1.105) server 2 (192.168.1.106) I ran these steps to re-sync: At the master - server 1 ...
15
votes
6answers
17k views

SSD vs HDD for databases

I am trying to purchase a new Server to run MySQL Server on. This new server will be a slave of my main machine. However, this server will be dedicated for reporting only "Lots of reads and complex ...
1
vote
2answers
26 views

MySQL High Severity Error [on hold]

I am completely new to MySQL. I am not a programmer or anything. I was installing the program months ago, and forgot my root password, tried to fix things and it failed. I did a system restore and ...
0
votes
1answer
361 views

Insert into a view derived from a table with a discriminator field

I am in a situation in which I have a base table with some fields and a discriminator field which could have one out of a specific set of values. From that base table, I have derived many views, one ...
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0answers
17 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 ...
0
votes
0answers
14 views

Confused over table_open_cache

I've been reading about the table_open_cache and I'm slightly confused about how big it should be, I've seen conflicting advice. My DB is running on MyISAM and has 199 tables. I ran into an issue ...
0
votes
0answers
29 views

Get the rank of a row based on a score I am generating from other field values

I am trying to figure out how I can get the rank of a row from a score I am generating from other field values. The score query looks something like this SELECT ((table2.field1*0.4) + ...
0
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0answers
22 views

Mysql - too many Deletion - Insertion

I'm creating crons for my OLAP sysetm, I have a cron that deletes the records from the summery table first and then insert the records in it again, Say Deleting 1 month records, and ...
0
votes
1answer
23 views

querying a table to find minimum of average population across all cities [on hold]

Consider the table (City) structure given below I need to query on this table: Query : the minimum of average population across all cities | Field | Type | +-------------+------+ | ID ...
0
votes
0answers
28 views

Deadlocks due to foreign keys (MySQL)

We are in the process of creating a web application using mysql as a data source. We are using spring with hibernate as an ORM framework. We have hundreds of entities with relations (manyToMany \ ...
0
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0answers
32 views

how to increase speed of this mysql query?

How I can increase speed of this search query? This search bring news based on time and title and text. each item has own factor. SELECT * , MATCH (`title`) AGAINST ('tax in work') * 1.65 AS ...
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0answers
16 views

Facing Failed to read stream error - mysql_native_password error

I have been facing the following error intermittently on MySQL. Authentication to host '127.0.0.1' for user 'root' using method 'mysql_native_password' failed with message: Reading from the ...
1
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1answer
47 views

Keeping an updated balance (Accounting)

I have been struggling trying to find a way to properly and reliably maintain a balance for accounts in an order/payment system. Currently, the process consists of three tables. Below example is very ...
0
votes
2answers
912 views

SQL - Cannot Add Foreign Key Constraint

Can anyone tell me why there are errors such as : Cannot Add Foreign Key Constraint And am i on the right track ? DROP DATABASE technology_university_hospital; CREATE DATABASE ...
3
votes
5answers
724 views

MySQL runs out of memory when importing innodb database

I have a small VPS with 512MB RAM and no swap (can't have any). I am importing a 1.5GB innodb database with mysql -u -p < database.sql Before the operation can finish it says : Lost connection ...