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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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
vote
1answer
11 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
votes
0answers
13 views

Looking to switch to Tibero RDBMS

Has anyone any experience on deployment of Tibero by Tmaxsoft, it's an Enterprise RDBMS, similar to Oracle without the high cost of ownership. Tibero
0
votes
1answer
13 views

Mysql query larger than tmpfs (ramdisk)

I recently set up a ramdisk tmpfs on our mysql server and the performance improvement has been quite noticeable. I've allocated 24 out of 32 GB's of ram for the ramdisk. My only concern is what ...
-3
votes
0answers
22 views

How to configure restful api services with java on a xampp local server

Question pretty much says it all. How do I setup a restful java api on my xampp local server?
0
votes
1answer
52 views

Simple SQL question [on hold]

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
votes
1answer
194 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
681 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 ...
-1
votes
0answers
17 views

Server settings with 36GB handling app+data

I'm setting up a server to handle a multi-site configuration on a beta application for a partner in a new business venture. Trying to assess sane values for MySQL. Currently I have set: ...
2
votes
2answers
64 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
vote
0answers
9 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
116 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
votes
3answers
15 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
votes
4answers
46 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 ...
0
votes
0answers
22 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
vote
1answer
231 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
vote
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 ...
1
vote
1answer
27 views

When to disable MySQL Query Cache

I have a high volume MariaDB 10 server thousands of databases of with over a million tables. Currently we are only hitting around 20% query cache hits. We are already employing Memcache and other ...
1
vote
1answer
19 views

Is the SQL syntax for InnoDB gauranteed to be the same between MySQL, MariaDB and Percona?

I develop an application that uses MySQL and explicitly uses InnoDB table engine. In a few cases we have clients using this application with MariaDB or Percona. I understand that MariaDB and Percona ...
0
votes
1answer
136 views

Replication Issue - Changing the replication-do-db filter

I have a server that someone has setup which are acting as a master on both database. Since they have been configured as both master on the same database, changes one on end has caused all sorts of ...
0
votes
0answers
14 views

Does use of remote servers increase overhead?

In considering the use of remote databases/servers, to what extent does their use increase overhead in terms of time as well as CPU usage and communication costs? Is there documentation on this issue? ...
0
votes
2answers
211 views

Replace a specific part of a string using MySql

I have many Strings in the database Like <iframe src="https://www.youtube.com/embed/-qTiYA1WiY8&index=8&list=PLPNcLSfYNC3Dw535smncyHRCBRmdf1Bti" frameborder="0" ...
2
votes
1answer
47 views

Can I avoid a join for my select procedures?

Here is a really simple example of a select procedure I'd like to create, although it's only partly done (it's pretty self-explanatory): delimiter // CREATE PROCEDURE mysql.selectTables (_first_name ...
0
votes
1answer
11 views

MySql crashes in VPS

I have a VPS in GoDaddy, which is crashing MySql service at frequent times. Here is the log file that may help to help me. 160425 09:24:53 mysqld_safe mysqld from pid file ...
0
votes
3answers
23 views

Any script to auto test tune and benchmark mysql config?

I'm looking or willing to do a script to benchmark mysql config variations for a specific system. A script that would change certain mysql config values and do a sysbench, save results, change ...
0
votes
0answers
12 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 ...
1
vote
1answer
660 views

Multiple product attribute inventory database design

I have a database to build based on inventory for my shop. This is the current data that I have put into tables. This is the package: This is the product attribute: This is the table ...
2
votes
1answer
164 views

Changing Charset to utf8 for all the fields and tables in mysql

How should I use the mysql and awk to change the charset for all the fields and tables for a specific database? I did not include username or password, so for sure it will not work. Should I run it ...
2
votes
1answer
29 views

Insufficient Prilivege for Function

I'm using a Function that I can't read, when I try to open it, I can't see the definition. I get following error Error : Insufficient privilege. Nevertheless, it is being executed by my app ...
0
votes
1answer
121 views

What is the best way to update a Production database with Test instance changes

I have deployed a Mysql database into Production. As I work on the next release of software I am making changes to a test database. I now need to update our Production system without losing the data ...
0
votes
1answer
474 views

inno_db_buffer_pool_size and key efficiency

I have the following metrics from mysql workbench After I have set innodb-buffer-pool-size to 6G, according to this answer's query on how to determine the recommended size. While the used buffer ...
0
votes
1answer
101 views

How to/Where to find MySQL templates for Toad Data Modeler

I have recently install Toad Data Modeler 5.3.4 and it only has Oracle data model templates. Where can I find and import the MySQL data templates so that I can create MySQL database models. I have ...
0
votes
1answer
221 views

Debugging lock time out with show engine innodb status

I am keeping getting this lock wait time out. Below is my current settings. [mysqld] datadir=/var/lib/mysql socket=/var/lib/mysql/mysql.sock user=mysql # Disabling symbolic-links is recommended to ...
1
vote
2answers
160 views

Query to Access a specfic data in the row using python

Am using wordpress and phpmyadmin for handling my database Below is the code I use to view entries on my form using python. In the form I ask users to check/uncheck specific questions. It works as ...
3
votes
3answers
31 views

Call to default values (MySQL) in a procedure

For the sake of an experiment, we're working with the following procedure (same DB, multiple tables): delimiter // CREATE PROCEDURE mysql.insertTables (_first_name varchar(30), _last_name ...
2
votes
0answers
30 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 ...
3
votes
2answers
53 views

Is it a good approach to duplicate data in a database?

I have a program that needs to store traceroutes (among other data). Here is a diagram that depicts the business scenario: My use case right now is to store the traceroutes using the following ...
0
votes
2answers
31 views

Stored Procedure Is Slower Than Query Due to Collation

I'm running two servers with MySql installed. I'm having an issue with a slow stored procedure (approximately 3 secs vs 0.1 seconds), solely on my production server, that is very quick on development ...
0
votes
2answers
23 views

Good reason to convert LONGTEXT column to smaller width if field is smaller?

We have a database that uses a LONGTEXT type for a column that does not need that much space. The maximum row size currently has about 6500 characters and that's with a few million inserts so it's ...
4
votes
2answers
3k views

Ansible: How to change MySQL server root password by reprovisioning the server

I have provisioned my server with Ansible playbook. I've used the root/bedrock-Ansible playbook. One of the tasks was to set up mysql server together with mysql root user password. Now I urgently ...
0
votes
1answer
108 views

How to store complex data using MySQL and JSP

At present I am creating a small web application called slam book. We know slam page contains so many fields. By using MySQL tables it takes too many columns and leads to complexity for accessing the ...
0
votes
1answer
128 views

Update records that match like regex from another table

I have two tables - ProductCategories and Products ProductCategories --- productid categoryid 1 2 3 4 Products -------- productid productname 1 Apple 2 ...
1
vote
1answer
26 views

ON DELETE CASCADE doesn't work even storage table is InnoDb

I tear my hair with the ON DELETE CASCADE Clause. In fact I have two tables I'm on linux and I have installed lamp with phpmyadmin. That's the tables : CREATE TABLE a( Idatable bigint(20) ...
0
votes
2answers
686 views

MYSQL Row Count Limits?

What is the maximum row count for a table in MYSQL? I have a system with around 600,000,000 rows in three tables. Average Data Length (from data_length column) for these tables is 58,000,000,000 ...
0
votes
2answers
113 views

How does InnoDB access disk?

I know that block(multiple disk sectors) is the basic unit of data transfer for the virtual file system so, if NTFS uses 4 KB cluster size for files how does InnoDB access disk if it uses 8 KB page ...
2
votes
0answers
24 views

Align auto increment index to next thousand

I am using MySQL. When applying a big change to a production database, I would like to change the next auto-increment index of all my tables to align them to the next available thousand. In other ...
1
vote
1answer
126 views

How to speed up queries in MySQL on a table with ~50 million rows

The table has 4 columns of type datetime, smallint(6), tinyint(4) and decimal(15,5). The first 3 columns are PK. There are four indexes on the table: one with all the PK columns, and one with each ...
1
vote
1answer
177 views

MySQL Create Table with Partition Very Slow on server machine

Following create table statement with Partition runs in 10 Second on My Development Machine windows 7, i5 , 8GBRam, single disk runs in 16 Second on Virtual Machine windows server 2012 , xeon 2GHz , ...
1
vote
2answers
78 views

How can I remove 'Using temporary ' and speed up my query

Hi I was working for hours to speed up this query using indexes, but its useless.. im tyring to optimize by eliminating 'Using temporary' and using only indexes. I wonder if there is another ...
0
votes
1answer
79 views

Need help improving query performance

I have this simplified version of my database: http://sqlfiddle.com/#!9/4b903/2/0 I have a million rows in history and my problem is the query is so slow. It would take more or less 2 minutes. ...