MySQL : Open-Source, Relational Database Management System

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478 views

Incorrect data when we using the CONVERT_TZ function on DST boundaries

We have a problem in converting time zone from "America/New_York" to "UTC". This problem occurs only on times representing 2.00 AM during the daylight saving. Timezone conversion with correct output ...
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3k views

'Access Denied' in MySQL on AWS RDS

I'm trying to use an ETL (in my current case, the free version of Talend). I've successfully set up a MySQL on Amazon RDS, logged in through the MySQL Workbench for Mac, and uploaded my company's ...
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1k views

MySQL Server hitting 100% unexpectedly (Amazon AWS RDS)

We've been struggling with this issue for months. This week we upped our RDS instance to the highest performing instance and although the occurrences have reduced, we're still seeing our database ...
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80 views

MySQL Partioning: Is there a performance tradeoff between number of partitions and size of each partition?

I have a large table (several 100 million rows) that I would like to efficiently partition. My question is whether there is a tradeoff between partition size and number of partitions. As far as I ...
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1k views

MySQL re-install fails under Mountain Lion

I have problems to reinstall MySQL on Mac OS X after it was running on my system. I uninstalled it because the PreferencePane wasn't working as expected, using the procedure described here: ...
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731 views

Index usage for database server

How can i fix the Index usage on one of our database server? It says from our Nagios control panel that: Service: DB Index Usage Host: MySQL Cluster Address: ( our IP ) State: CRITICAL Additional ...
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1k views

SQL query optimization in Prestashop e-Commerce solution

I'm working on a layered navigation module within Prestashop e-Commerce solution. I'm trying to optimize a SQL query which creates a temp table during execution. I think this is creating a ...
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99 views

Can't connect to MySQL Cluster Storage (data) nodes

I've deployed a MySQL Cluster with a few nodes, and I want to access the storage nodes directly from another machine using NDBAPI. When I tried to connect from the same host it worked, but when I try ...
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315 views

MYSQL & Access ODBC

I am trying to connect mysql with access, i am settings up the ODBC correctly from the data sources, however i get a driver error. I am using access 2010 and the driver version of the ODBC conector ...
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15 views

MySQL Filesort/Order By Slow

I've been struggling with a query for the past few weeks and it now just appears as gobbly-gook to me when I try to optimize. The query runs - at about 2.3 seconds, but I know there has to be a more ...
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13 views

MariaDB 10 InnoDB Partition with Data Directory

mysql --version mysql Ver 15.1 Distrib 10.0.20-MariaDB, for Linux (x86_64) using readline 5.1 I have a MariaDB 10 installed, though I tried with the 5.5 release in the CentOS repos. I'm ...
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10 views

Adding new sproc to the exisiting database using connectors?

The project I'm currently working on is mostly pythonic, by this reason I'll likely use mysqldb python connector or sqlalchemy. The question arose when I've tried to find out the way of adding new ...
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29 views

Mysql master slave performance

Im running a mysql database on a linux server with 24gb ram and im trying to run a performance test of my system. Now the thing is, when im running it without a slave replication and in particular, ...
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14 views

Mysql Connector C++ data retrieval question

So, the result of a query is stored in a ResultSet. And that type has multiple methods for data retrieval such as getString, getInt etc. I'm curious how the data is stored in that object. Is all the ...
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29 views

Mysql Trigger use inserted value as column name for update After Insert

I have 2 tables: One for storing order_products and another one for keeping inventory levels for multiple stores The order_products table keeps the ID for the store in the store_id column. ...
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16 views

Unique ID for related records in a MySQL Table

I have a requirement to allocate a unique RecordID (ImportID) to multiple rows in a table. We are importing a text file which contain related transactional information but variable record types and I ...
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46 views

Database design/layout

I have an objective to record and store test data. A secondary objective is to track the progress of the test programme (it is a large programme). So I want to use MySQL (not Access or DOORS) to ...
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42 views

Select last row for a certain group

I have two tables: Table users columns | type | notes --------|--------|------- id | bigint | PK ... | ... | ... Table events columns | type | notes ...
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61 views

Why my sql query run faster than my stored procedure?

I am trying to write a script in MYSQL Workbench to update my database every day using stored procedure but I find it too slow compared normal query or temporary tables. If i use temporary table the ...
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73 views

Limiting query to certain amount of rows evenly distributed

Given a table: id -- 1 2 4 6 8 10 I would like to be able to specify a limit and have that amount of rows returned evenly distributed across the entire set when it is ordered by a specific ...
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52 views

MySQL - Preventing lock wait timeout when deleting rows from self

I have a table of around 500k rows (not big data), that I need to query against itself and then delete some of the rows which don't match the filters. At the moment my query looks like this: DELETE ...
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35 views

Mariadb support rtree index on innodb soon?

I was looking through mariadb bug list online (https://mariadb.atlassian.net/secure/RapidBoard.jspa?rapidView=24&projectKey=MDEV), but I am unfamiliar with JIRA so I am not sure exactly what I am ...
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29 views

Update all foreign keys to a different primary key

In a MySQL database, I have a table full of business information. Lots of businesses have been inserted twice due to human error, so the same information exists with two different primary keys. ...
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50 views

MySQL bulk deletions

I am currently looking at how to most efficiently delete rows from a table in bulk. The database I'm using is MySQL with innodb. The table I want to delete from can be any size, but will usually be ...
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62 views

Why does this deadlock occur?

We're using MySQL with the INNODB storage engine. The account table is accessed by two different transactions. We didn't expect a deadlock because only one transaction is holding a lock (2): ...
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44 views

How to display all the dates between multiple two dates in a table?

I want to display all the dates between two dates for a particular record And this is the table : ID Start_Date End_Date 1 2013-01-14 2013-01-18 2 2013-02-01 2013-02-04 and now i want to get all ...
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79 views

MariaDB is ignoring /etc/my.cnf

The variable I am trying to change is innodb_buffer_pool_size. As you can see below the settings is 512M. But SELECT @@innodb_buffer_pool_size; returns 134217728. When I execute: /usr/libexec/mysqld ...
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37 views

How to send MySQL query results to outfile and standard output at the same time?

I "normally" query MySQL with SELECT col1, col2 FROM tablename LIMIT 10; and sometimes instead send the output to a file with SELECT col1, col2 FROM tablename LIMIT 10 INTO OUTFILE ...
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65 views

Using SESSION sql_mode = 'NO_BACKSLASH_ESCAPES' before running query to remove backslashes in database

See this post: How do I remove backslashes from records in MySQL I have similar issues in that code that was developed before me did not use strip slashes with magic_quotes_gpc on before inserting ...
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20 views

MySQL performance of trigger when many rows are affected

I have a question on MySQL triggers which I hope someone might be able to help with. As part of our platform, we have a table (accounting), which grows rapidly. We also have an archived version of ...
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67 views

Getting count of visits for multiple different outlets

I'm trying to get the distinct count of id that visited different outlets. I have more than 50 outlets so I don't think I can use the IN operator. CREATE TABLE transact ( year int NOT NULL, card_id ...
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112 views

MySQL method for inserting data from JSON using Python Connector

I have been using Python to insert parsed data from a JSON server response into a MySQL database. The JSON data consists of around 10,000 responses, each holding around 40 nested pieces of ...
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21 views

How to make an indexed search over a list (set)?

A follow-up question for How to most efficiently store possible combinations of categories? An answer pointed to SET datatype. As far as I know, the default search option for it, FIND_IN_SET, doesn't ...
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34 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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31 views

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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47 views

(VS Comm./VB6) How to Select from 2 different data sources/formats in one query?

I have two working TableAdapterQueries in my project, one selects from a MySQL database on a virtual server I own, the other is an Oracle PL/SQL database on a separate server. The data (and ...
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18 views

Is there any option to import specific databases from all databases dump

Is there any option to import only required databases from a all database back up .
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63 views

MySQL database table creation is very slow

I´ve run a test script that creates a database and 3 sample tables. Machine: Windows 7 x64 and MariaDB 10.0.17 DROP DATABASE IF EXISTS dbTest; CREATE DATABASE dbTest; USE dbTest; SET profiling = 1; ...
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32 views

How WHERE works with column name only?

I have table with varchar column. Some rows are empty, some have content. While preparing SELECT statement, I accidentaly run query like that: SELECT column_x FROM table_x WHERE column_x; It gave ...
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24 views

Finding missing_index_details in MySQL

MS SQL Server apparently can tell you what indexes would be useful for your query. Is there anything similar in MySQL? This article (scroll to "Find missing indexes") says that in Microsoft SQL ...
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89 views

Configuring slave from EC2 master to Amazon RDS slave

I am configuring replication from EC2 master to Amazon RDS instance. After starting the slave, I don't see any errors but I see slave_IO _thread is connecting. Master version:5.6.23 Slave ...
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44 views

Get unique rows based on max of a column in mysql

I came across many solutions like the one in this question. However, they all are restricted to data from one table. I'm very very new to SQL. I'd like to get the same results as in the linked ...
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38 views

Poor performance filtering mysql spatial join

First of all, sorry for the crossposting. I ask this question in stackoverflow and they sent me here I have a mysql table with spatial references (GEOGRAPHIC_FILTER), like cities, countries, natural ...
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160 views

MySQL SSL using MariaDB JDBC Driver

We have the following setup: Ec2 instance running a jboss server with mariadb (1.1.7) datasources setup to connect to an rds instance running MySQL 5.6.21. We would like to turn on SSL on for this ...
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0answers
30 views

mysql workbench connection type tcp/ip over ssh with libpam-google-authenticator enabled

I'm attempting to connect to my MySQL Database using the Connection Method "Standard TCP/IP over SSH". I filled out all the SSH and MySQL connection details correctly, however I get the message: ...
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0answers
84 views

Suddenly high CPU usage

I've read a lot about MySQL optimisation and I already optimised MySQL about a year ago. Reason for that was a high system load average. I tuned many queries and edited the my.cnf file. Since then ...
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36 views

MYSQL — Inventory View with calculated fields

Trying To create an inventory view. I have created this query using MS Access query builder since I am no pro at SQL and this is pretty convoluted. When translating this into MYSQL syntax I get an ...
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122 views

Limit relation one to many or one to one

In a relationship one to many or one to one you can limit the relationship of the related table? For example, I have a table 'cliente' and another 'acct', each 'cliente' can have thousands (perhaps ...
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10 views

How “relatively safe” is the data which was salvaged from corrupted MySQL InnoDB database?

I encountered the corruption like the following. 150208 14:27:52 InnoDB: Error: page 443375 log sequence number 8941 870477908 InnoDB: is in the future! Current system log sequence number 5968 ...
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49 views

InnoDB Deadlocks Involving Currency Transactions

We're dealing with InnoDB deadlocks that are affecting our virtual transaction system. LATEST DETECTED DEADLOCK 150210 20:51:03 *** (1) TRANSACTION: TRANSACTION 0 4240405649, ACTIVE 0 sec, process no ...