MySQL : Open-Source, Relational Database Management System

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137 views

Can a slave with a dynamic ip update the master

How can I setup mySQL replication in such a way that a slave on localhost with dynamic IP can update the master as well as get updates from the master which has a static IP. The slave will not be ...
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1answer
607 views

Is it safe to use mysqldump to backup and restore a master-master cluster

Not sure if the specifics matter but just to get it out of the way I am talking about a Galera cluster on XtraDB (MariaDB). I have a master-master setup and am interested in backing up and restoring ...
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120 views

MySQL taking significantly longer to query via PHP than CLI

TL;DR: I have a query that takes under a second to run via MySQL's CLI, but over 12 minutes via PHP and I'm at a total loss on what to check next. It's a fairly horrid query, full of joins, but the ...
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1answer
22 views

Finding the same value in a column and only returning rows without the same value

I have a query that i have to find the DiscountPercent that are the same and not show the rows with the same DiscountPercent. I have tryd this and it brings back the values that are the same SELECT ...
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1answer
209 views

Could not start mysql or MariaDB. Permissions were ok, but mysql-bin.index permission error

Using MariaDB 5.5.36. Here's what I got while trying to start MariaDB: # syslog Dec 14 09:40:52 vps1497 mysqld_safe: Starting mysqld daemon with databases from /var/lib/mysql Dec 14 09:40:52 vps1497 ...
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296 views

Does MySQL load the entire row into memory, or just the columns used in WHERE, ORDER BY and GROUP BY?

I have a table that isn't very large row wise (in the 100ks range), but that contains a lot of raw data that is very large in size. Despite having a relatively little number of rows, it's around ...
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1answer
8 views

Unable to get any type of connection using mysql on LAN

My question is rather simple, I have a Windows 7 machine that is hosting an Apache server and a MySQL server using the XAMPP control panel. Both of these have been installed as a service on the ...
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1answer
18 views

delete query performance issue on mysql

I have two tables table1, table2 where table2 is a subset of table1 (basically created with the query create table table2 as select * from table1 where .....) Now, I am trying to run the below query. ...
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2k views

MySql InnoDB tables are missing after restarting

I had a MySql database with a few InnoDB tables. After restarting the server, and starting MySql Server again, I connected to the MySql Server using MySql Workbench, and couldn't see the database at ...
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25 views

How to merge two databases, both with primary keys

I have two databases, both with the same tables, but the data is out of sync. I need to add data from database A to database B, but not overwrite any data in B that exists in A, instead add it with a ...
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1answer
22 views

How to restore database from /var/lib/mysql

I have a database folder from a crashed server called gain_wordpress. I'm trying to put that database on a new server but I'm not able to do it successfully. I don't have a .sql dump, all I have is ...
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21 views

Change MariaDB 10.0.17 (MySQL) master to a slave

I have a MySQL master/slave configuration -------- -------- | master | -> | slave1 | -------- -------- I want to kill my current master, transform slave1 to be the new ...
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1answer
132 views

MySQL: Optimize query with a range and distinct count

I have a query on a large table with millions of rows that looks like this: SELECT COUNT( DISTINCT clicks.tx_id ) AS unique_clicks_count , clicks.offer_id FROM clicks WHERE ...
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1answer
17 views

What is the performance benefit when using a temporary table to update a regular table?

I'm trying to understand what the performance benefit between two different methods of updating multiple table rows. For the first method we have an explicit update statement for each line to be ...
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0answers
16 views

Slave executing queries with different charset

I need to change a database charset because of this issue and I solved my issue in staging environment with the SQL command ALTER TABLE `articles` CONVERT TO CHARACTER SET utf8 COLLATE ...
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1answer
20 views

Unable to get the latest value added to Mysql table based on posted time

SELECT * FROM discussion_comments GROUP BY disc_id ORDER BY posted_date DESC I have table example like given below: CREATE TABLE example ( id int(11), cname varchar(11), posted_date date, ...
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1answer
919 views

SQL Server to MySQL sync, using Workbench, FreeTDS, and iODBC on 10.9

I've been struggling to get the MySQL Workbench to behave properly to complete the following: With Mavericks (OS X 10.9), connect to a SQL Server and create a migration job to a MySQL server. The ...
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21 views

Subquery optimization

I was reading through this article - http://explainextended.com/2009/09/18/not-in-vs-not-exists-vs-left-join-is-null-mysql/ I am working with an existing design. What I want is to be able to select ...
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21 views

mysql - order by first condition in where clause

I have a table consists of the following fields id, name with the following values 1, ciro 2, test ciro 3, ciprox 4, other 5, other i would like to get all the values that begin with "ci" or ...
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1answer
37 views

LEFT JOIN DEFAULT NULL VALUE

I had query simplified like this : SELECT a.id, a.name, b.* FROM a LEFT JOIN b ON a.id=b.id Which b is from group concat select (very dynamic column). Sometime there are 3 column in b, sometime ...
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9 views

How to create a communication link failure in MySQL

For testing purposes I would like my MySQL server to generate a communication link failure (com.mysql.jdbc.exceptions.jdbc4.CommunicationsException). How can I tweak MySQL that this error is easily ...
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15 views

Need a table schema for general store app [on hold]

I am Developing one application for online general store and stuck some where near making a schema for the products. Here, Every Product has brands and Product can come in multiple varieties like for ...
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10 views

Mysql cursor alternative / Optimization - each row updates are too slow

I'm looking to optimize my cursor based update or actually replacing it... Situation We're carrying out promotional campaigns and I'd like to track user activity per campaign. Logic Each campaign ...
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2answers
21 views

MYSQL Get column group with different values on other column

I have the following table: week status ------- ------ 102014 1 102014 1 102014 1 112014 2 112014 2 112014 2 122014 2 122014 0 122014 0 132014 1 ...
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1answer
16 views

Access denied to user@localhost

As a root user i did this: GRANT DELETE, SELECT, INSERT, UPDATE, EXECUTE ON dbName.* TO 'user'@'localhost' IDENTIFIED BY 'apassword'; In 'dbName' i created a procedure 'proc_name' with definer set to ...
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1answer
15 views

Optimize Query in MySQL

I've following tables with respective fields 1) wi_individual_g(ind_id,ind_is_recepient,ind_deleted,ind_district_id,...) - Around 200K data 2) wi_individual_p(ind_id,prg_id,...) Around 250K data 3) ...
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14 views

Use ID from another mysql database?

I have a mysql database for form submission (written in PHP) data and a mysql database for CRM (using X2CRM) on the same server. When a form is submitted on my website the POSTed data of the form ...
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2answers
195 views

MySQL incremental backups per database (not global)

While searching for free/open-source MySQL incremental backups solutions I have found a number of ways to do incremental backups and all of them seem to either rely on "logical" way of backups/restore ...
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18 views

Allow only parent DELETE cascade to delete child rows

I have a Product database with the following components: ProductOptions is a list of option names for each Product, ProductVariants is a list of variants for each Product and ProductVariantOptions is ...
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1answer
11 views

Guidance in creating a database for parks division attendance data [on hold]

We(group project) are trying to design a mysql database for our "client" which is a division of Off-Highway motor vehicle parks. Our client keeps tack of attendance data by month of many different day ...
2
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1answer
212 views

Avoiding Multiple Queries when Searching for Records Associated with a Set of Records

So, I am sure I have done something really stupid while designing this, and I'm open to schema changes if they'll really help me out. On to the problem: I have a custom shopping cart system (backed ...
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1answer
125 views

Fetch data from database from multiple tables matching condition

I want to fetch data from the database. I have three tables in my database like listing_master_residential and listing_master_condo and listing_master_commercial. There are three tables and there is ...
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1answer
191 views

Mysql database in a symlink-ed directory gives ERROR 1005 (errorno: 13)

I've the need to put my database outside the default datadir of mysql. To achieve that I followed the symlink guidance in the mysql documentation. However when I use the db if I try to create a ...
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1answer
26 views

mysql upgrading from 5.1 --> 5.6 do I have to do mysqldump before upgrade?

I was reading this document: http://dev.mysql.com/doc/refman/5.5/en/upgrading-from-previous-series.html It says when upgrading from mysql 5.1 to do a mysqldump and then a reload. Is there anyway ...
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2answers
41 views

SELECT that is null if there is one more register in this date that is not null

I'm trying to make a query that I can't produce... This is my table capturainfo captureid int(11) userid int(11) date date dateinit datetime datefin datetime I need to select ...
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0answers
11 views

Multi tenant database: Join table between 3 tables (user-role-company)

When designing a multi-tenant design i face this problem: One User can have multiple Roles, one Role can have Users (m-n) One user can be part of multiple Companies (organizations) and Vice-Versa ...
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2answers
20 views

How to use a trigger to only insert one row

I am doing a third year project using an intel galileo that reads an RFID card, and signs a student into a class, and I am using multiple tables. I have nearly completed it as all reads are been ...
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2answers
53 views

Large ibdata file in MySQL

I am having MySQL database with all my tables as InnoDB with file_per_table config on. But Still I m seeing huge ibdata file ( ~50GB). All tables are having .ibd file as well. This is a machine I have ...
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1answer
39 views

SELECT COUNT(*) expensive query mysql?

I have following query: SELECT COUNT(*) AS `numrows` FROM (`phppos_items`) WHERE `deleted` = 0 explain: mysql> explain SELECT COUNT(*) AS `numrows` -> FROM (`phppos_items`) ...
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1answer
115 views

Query does not use index (according to EXPLAIN SELECT)

Can anyone give me an indication, why this query does not use the Key on the table 'gtg'): ...
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1answer
18 views

Select range of non-identical date from different table

On MySQL5 with innoDB, I have sensor data in multiple tables, all with an ID and a DATETIME field, like so (two tables shown, but there are more). The IDs and DATETIMEs are not identical between ...
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39 views

Why is MySQL not saving inserted data?

So I have the following insert statement that I run through MySQL Workbench: INSERT INTO PeakOnlineCount (time_stamp, LocationId, Count) values ('2015-03-26', 0, 1) If I run the following query: ...
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2answers
29 views

MySQL silently replaces UTF chars with literal question marks

I'm experiencing a situation similar to this SO question i.e. I'm working with a legacy database which has UTF8 content in latin1 tables (pretty ugly I know). Now I'm getting new data from a new ...
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0answers
17 views

How we resolve Mysql Enterprise online backup error with “CORRUPT LOG RECORD FOUND” log error

I have configured my production MySQL database with MySQL Enterprise "online Backup" option. The configuration was went through successfully. When the assigned scheduler is try to take backup then i ...
0
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1answer
26 views

how effective creating 2 database with same content?

I'm in a dilemma if creating redundant database will speed up the access considering only the CRUD factor. Is it effective to create a dedicated DB for creating/updating/deleting records and a ...
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1answer
25 views

MySQL query where one column is equal to another [on hold]

I've written the query below (that is not working as desired): update payments set payments.commission_id = ( select commissions.id from commissions where ...
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4answers
120 views

Remote MySQL connection fails (10060) - “Can't connect to MySQL server on domainname.com(10060)”

I have developed one application in vb6, and i am using online MySQL database server for storing my application's data. So when i am try to connect with my database server,when first time i connect to ...
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1answer
233 views

MySql - is possible that performance issues are caused by dynamic SQL?

We have this MySQL SP, which uses dynamic SQL. It seems it does NOT perform well under load. It is possible that this SP becomes slow under load because it uses dynamic SQL? Can dynamic SQL cause ...
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0answers
34 views

MySQL replication: most important config parameters on slave for performance on master server?

This query is almost the same as this question. But in this case, a configuration to make the master perform faster or just the same. Case We have a Master-Slave setup on a Mysql 5.0.77 - MariaDB ...
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2answers
18 views

How to Solve ERROR 1064 (42000)?

DROP PROCEDURE IF EXISTS proc_x; DELIMITER # CREATE DEFINER=`root`@`localhost` PROCEDURE proc_x(sequel CHAR) proc_main:BEGIN SET @SQL = CONCAT(@sequel); PREPARE stmt FROM @SQL; EXECUTE stmt; ...