MySQL : Open-Source, Relational Database Management System

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Dropped connections, corrupted schema … is MySQL sick?

Lot's of problems and I wonder if it's all tracable to some root cause. I'm trying to load a simple schema related to product marketing. The symptoms are: Not being able to forward engineer said ...
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17 views

Can MySQL log lock waits?

Is it possible to have MySQL log queries or transactions where lock waits occur? One can debug specific application errors generated from lock wait timeout errors from the DB but without the ability ...
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713 views

mySQL Optimization Suggestions

I'm trying to optimize our mySQL configuration for our large Magento website. The reason I believe that mySQL needs to be configured further is because New Relic has shown that our SELECT queries are ...
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Mysql keep shutdown after few restart on fresh Centos installation

I have restart a few times - systemctl stop mysql and systemctl start mysql on my Centos 7. After some time, all my application on this machine will face this error SQLSTATE[HY000] [2002] Can't ...
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1answer
148 views

Mysql - Select To XML

I'm Building Audit Trail with Trigger, and want to convert the inserted / updated / deleted value into XML and store it into another table. my trigger look like this: DELIMITER $$ CREATE ...
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2answers
15 views

finding text in a string

I am trying to find records where the post code starts with a certain set of characters from some 10,000 records, 1300 or so of which meet the select below. My code is Select * from table where ...
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7 views

How to add External data source into MySQL?

I want to add ODBC data source in MYSQL. Is that possible ?Which is the best to perform this ?
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1answer
414 views

How to removing or reduce the size of redo logs in MySQL cluster

Can anybody tell me that how can we reduce the redo log file size or can we remove the redo log file size in MySQL Cluster and also what will be the impact of it on performance of cluster.Also can we ...
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2answers
154 views

Automobile database logic

I am building a web based quoting system for a local automobile dealership. I think I have figured out the logic for the databases but I want to get a second opinion before I start just to make sure ...
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1answer
171 views

Mysql can't write to filesystem

I need to output some queries as csv files. The directory is in the webroot and I want it to be writable by apache too, so I'm trying to add mysql to the www-data group (on Ubuntu). I thought this ...
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3answers
470 views

Do I need to reindex mysql table after bulk delete?

I have a table in MySQL with a lot of INSERT and SELECT at every second. And there is a bulk delete of some older data once in a day. Do I need to reindex the table after delete? I want to increase ...
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0answers
6 views

getting an error in trigger while invoking a procedure in it

i have created a procedure name 'prd' which contains 3 parameters (pmat_amt,pstartdate,pstopdate) which is used to update a column in the table rd_details contains 3 columns which are ...
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2answers
28 views

Select from two tables with not direct relationship

OK i found myself in a dead end, and i know must be a way but my brain is just about to explode. This is the case: I have two tables with tons of rows, one for works done (lets call it works table), ...
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1answer
135 views

Change MAMP to use a lower Mysql 5.1 version

I need to have the same development environment for my PHP program. My clients test server is running on Mysql 5.1 while my local is using MAMP running Mysql 5.5. How do downgrade my mysql database ...
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1answer
96 views

MySql - Reorder primary key with auto-increment

I have two table(s) 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 ...
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1answer
588 views

Mysql Deadlock on update query on same row

My server is experiencing occasional deadlocks on two update queries on same row both using index (primary key). The conflicting queries are: UPDATE auth_user SET rep_score=185 WHERE ...
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1answer
97 views

Tuning Mysql and Monitoring

I would like to know if anybody can point me towards a tool/way for MySQL database tuning ... Actualy the tunning of my.cnf is like below My database is in MyISAM | Mysql 5.1.73 key_buffer = 500M ...
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1answer
248 views

MYSQL Timezone support

We are having a shared hosting plan and they are saying that do provide MYSQL Timezone support in a shared hosting plan. I can create timezone related tables in our database and populate them with ...
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1answer
17 views

MySQL out of Memory, but Only Through MSSQL Linked Server

I am getting an error "MySQL client ran out of memory" when trying to do some simple MySQL selects or inserts from Microsoft SQL through a linked server. It was working fine for a week or so, and for ...
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2answers
15 views

MySQL always writes simple temporary/memory tables to disk (both tmp_table_size and max_heap_table_size are set to 8GB)

I'm struggling with this issue and just can't figure out why this is happening. CREATE TABLE sitecache._test ENGINE=MEMORY SELECT * FROM website.gallery_likes WHERE 1=0; Every time I execute this ...
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3answers
35 views

How to select the largest value of the same column in multiple tables?

I have multiple tables which have some columns with the same meaning, eg., event_timestamp. The schemas are like following: Table A: ...
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1answer
38 views

Can't insert arabic text into mysql database using mysql prompt

I had a local table with arabic values.when exported i got the following query. DROP TABLE IF EXISTS `type`; CREATE TABLE IF NOT EXISTS `type` ( `bs_id` int(11) NOT NULL AUTO_INCREMENT, `types` ...
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2answers
52 views

SQL Multiple JOINS Interpretation order [on hold]

I have a big problem of using multiple joins in one SQL Statement. For example i have 10 Tables which they are tbl1,tbl2, tbl3,..,tbl10. I would like to select some columns from each table from tbl1 ...
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Install mysql udf sys_exec to call php file on trigger

Can anyone explains complete details of installing sys_exec function to call php file on mysql trigger over the SSH. I tried solution given by various links but not luck. please suggest if anyone has ...
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1answer
38 views

Cannot create MySQL database with name '5e370227_db'

Why am I getting error when I try to create database with name '5e370227_db'? I am getting the following error: mysql> create database 5e370227_db; ERROR 1064 (42000): You have an error in your ...
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2answers
20 views

How to change ibdata1 path in mysql?

My ibdata1 file is keep on increasing in size and for a temporary solution, we want to move the file to a separate location with more hard disk space. But, when I change the my.cnf file parameters ...
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1answer
21 views

How to upgrade MYSQL from 5.6.12 to 5.6.21?

I have been a MSSQL DBA and dont have much knowledge about MYSQL. Does MYSQL also have patches just like MSSQL? I need to do MySQL version upgrade from 5.6.12 to 5.6.21 but i do not have much ...
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1answer
423 views

How to start mysqld with read-only data directory?

I'm trying to start MariaDB in a docker container, using a data directory from the host mounted read-only. MySQLd is of course shut down on the host. Unfortunately, even with adding the read_only flag ...
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2answers
162 views

MySQL 1264 warning from libmysql

I'm using the libmysql.dll library to connect to my database from a 3rd party application (metatrader). I managed to connect and things are going almost fine. I use mysql_real_connect and ...
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2answers
5k views

Mysqld.exe memory usage

I am using mysql 5.6.14, For a long time i got large memory usage by mysqld.exe, i was trying many different solutions and my.ini settings to fix this up but didn't succeed, This is my config ...
2
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1answer
143 views

MySQL fulltext selection performance

I have 1.5M rows in a table. Following is the table create code: CREATE TABLE `jobs` ( `id` INT(8) NOT NULL AUTO_INCREMENT, `job_id` VARCHAR(50) NOT NULL DEFAULT '', `title` VARCHAR(255) ...
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1answer
109 views

LDAP authentication with Percona Server

Reading over this post it seemed to indicate this plugin allowed user authentication via LDAP Percona Server is bundled with the PAM plugin which opens a plethora of ways to authenticate to ...
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1answer
77 views

How to optimize a very slow query with joins and group by?

I have this GTFS database : All the ***_id columns are indexed, and there are foreign keys between tables (such as a FK on trips.route_id to routes.route_id). So basically the link between a stop ...
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1answer
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Query in mysql is not solving [on hold]

I have two tables as pet details & owner details. In that many, no. of columns like Name,pets_id,Owners_id & Name,Owners_id,Mobile No. respectively. I need a query is to display owner ...
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2answers
76 views

mysql.sock not found on CentOS 7 machine

I am getting the following error when I try to log into mysql from the CentOS 7 terminal of the machine where mysql is installed: ERROR 2002 (HY000): Can't connect to local MySQL server through ...
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3answers
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+50

what would be the primary disadvantages of splitting my tables into table spaces and/or separate schemata

I would like to organize the MySQL tables of a complex application into some groups, to avoid looking at a one big bin of tables. One big bin is harder to administrate when e.g. I would like to reset ...
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3answers
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+50

Clustered index performance consideration in MySQL & PostgreSQL

In MySQL/InnoDB, the clustered index is synonymous with the primary key, so picking up a poor primary key affect your db performance, i.e. use of UUID as PK is a performance killer for database write. ...
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2answers
21 views

Mysql join not working

I have database with two tables: logs & src_info mysql> describe logs; +-----------+-------------+------+-----+---------+----------------+ | Field | Type | Null | Key | Default | ...
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1answer
17 views

Calculations involving thresholds between two tables

I have a table comment and a table price like below. The key columns in both tables are ticker_id, price_datetime and price_open. The last column threshold in table comment (which currently NULL) is ...
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1answer
11 views

Will coloum size change when trying to use single unicode character in place of multiple ASCII characters?

I have a column in utf8_unicode_ci collation for text type in MySQL. The content is in Unicode, I have used tags like {br}, {v}, {t}, {h} etc.., throught the database. I am now thinking of changing ...
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3answers
260 views

How to remove master role from MySQL server

I have 2 MySQL servers, one is the master and other one is slave, that's all good. The problem I have is that the slave is also set up as a master. I would like to disable or remove the master role ...
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1answer
92 views

InnoDB internals - checkpoint, LSN, dirty pages

I'm looking into InnoDB internals regarding buffer pool, checkpoint and dirtypage. However there isn't enough information to answer my question. When I run show global status, I can get ...
2
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1answer
2k views

Extract MySQL information from a compressed tar.gz file

I have a back up-of a MySQL database which is contained in a .tar.gz file - I need to restore it. I've never had to do this before. The only way I can access the database is through phpmyadmin. There ...
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1answer
15 views

Footer with counter of records, using union of query

I have a report that has a header (display the current date), I use UNION to join the header with the main query that returns multiple records, it has 10 columns. After that another UNION for joining ...
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1answer
21 views

Purge mysql log bins older than two weeks automatically

I have to manually write purge binary logs bin to "mysql-bin.somenumbers" ; Once in a while, I need to reduce the spaces that binlogs are taking on my web server. Is it possible to purge binary ...
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2answers
412 views

Import CSV file into Mysql with Multiple Delimiters/Field Separators

I'm trying to import a large csv file into Mysql. Unfortunately, the data within the file is separated both by spaces and tabs. As a result, whenever I load the data into my table, I end up with ...
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1answer
97 views

Reviewing relational database tables

I am building a database, but I am a little bit confused with my table relationships. I wish someone could help review my table relationships below for me and tell me where I am going wrong. I have ...
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1answer
17 views

Add linked server from SQL-Server to MySQL: “Data source name not found” (Error:7303)

I'm trying to link my SQL-Server 2005 on Windows Server 2008 R2 with MySQL 5.5.40 on a different computer. I have followed this guide: ...
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1answer
253 views

Nested query not recognize external table

i need to a query that show week by week the total amount of imports of any company and in addition add a ranking position depending on that amount. I've made this query but the problem is the inner ...
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1answer
32 views

Combine two updates [on hold]

I want to combine the following SQL statements into one: Update ENGROYLIB/UCOMPFL Set AddrLn1 = 'ELECTRIC LIGHTING STATION,', AddrLn2 ...