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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0
votes
2answers
202 views

Transaction has set autocommit = 0, but still the update happens before I commit

I have multiple MySQL InnoDb tables, I am trying to alter/insert/modify many of them in a SQL transaction, I set autocommit to false, so that if some SQL statements fail, I do commit the rest of ...
0
votes
1answer
85 views

what will happen to the binary log if it reaches its maximum value ? Does it reset to mysql-bin.00001 again?

what will happen to the binary log if it reaches its maximum value ? Does it reset to mysql-bin.00001 again ? I know the below points exist means, there won't be any reset happen in binlogs. I ...
0
votes
1answer
441 views

Possibly a silly question: Can I install MySQL on an External HDD connected to my Router?

I have a 1TB Western Digital External HDD and I was wondering if I can turn it into a MySQL Database? The HDD itself is connected to my router via USB (BT Home Hub 3) and I would like to experiment ...
1
vote
1answer
726 views

MySQL 5.5 Replication to Galera/Percona XtraDB Cluster

We are currently investigating moving our current MySQL 5.5 Master > 5 x Slaves (with Statement Based Replication, apx 250GB data and growing) to a HA clustering option. Mainly to provide greater ...
1
vote
2answers
60 views

Number of connection running within certain period of time?

Is there any way to capture number of connections or processes which is running on the prod server each 10 mins of interval? And MySQL version is 5.1.47.
0
votes
1answer
94 views

Is there any way to perform atomic updates of stored procedures in MySQL?

I know that MySQL does not support atomic updates of stored procedures yet and it is bug which was reported on 2005 but not yet resolved.(http://bugs.mysql.com/bug.php?id=9588). In our project ...
0
votes
0answers
28 views

Prevent Reconnections During Application Cluster Restart

I have a large cluster of application processes (>5000) spread out over multiple EC2 servers. When I attempt to restart them or deploy new code (with a restart), they all attempt to reconnect to the ...
1
vote
2answers
92 views

InnoDB row metadata size (minimum row size)

I'm trying to decide whether to normalize a thing further, and need to know what the smallest a row in InnoDB can be (I've got MySQL 5.6). This is not exactly my case, but for simplicity, let's ...
0
votes
1answer
143 views

GROUP BY on two large joined tables

I have two tables: Person ------ PersonID (PK) GroupID DeletedDate PersonData ---------- PersonID (PK) FieldID (PK) Value The fields are custom-created; hence the schema. I am trying to run a ...
0
votes
1answer
5k views

SQL error: Unknown column in 'where clause' [closed]

I have following very simple PHP MySQL Query: $sql = 'SELECT * FROM bundesland WHERE bkuerzel = ' . $_GET['q']; $result = mysql_query($sql, $con); When I execute the query with a click on a item ...
0
votes
2answers
63 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 ...
-1
votes
1answer
53 views

Query error int/varchar LEFTJOIN [closed]

Can someone tell me what´s wrong with this query? $sql = "select bans.id as banid, bans.type, bans.data, bans.reason, bans.expire, bans.added_by, bans.added_date, players.id as playerid, ...
0
votes
2answers
309 views

MySQL - Changing from system tablespace to file per table

The MySQL database I am working on has the InnoDB tables and indexes stored in the system tablespace which is now > 20Gb. Some years ago I managed a MySQL database that made use of a file per table ...
0
votes
0answers
28 views

Big difference between id value [duplicate]

I have this database table where I insert multiple results during 1 action. In php I have a submit button when pressed, inserts 1-50 rows(depending on the user input). I've got a foreign key in this ...
0
votes
0answers
92 views

InnoDB problem when upgrading to Joomla 3.X

we have different Joomla and WordPress sites on 1 server. We want to upgrade a Joomla 2.5 site to Joomla 3.X. The upgrade only works when we remove the dbdata1 file in MySQL(it is automatically ...
4
votes
2answers
1k views

How to speed up mysql export and import

I need to perform a DB migration from Server A to Server B. Server A: MySQL version installed 5.0.6 Server B: MySQL version installed 5.6.20 OS: Both are running RedHat Linux 64bit. 16 ...
3
votes
1answer
372 views

11.2GB text file import MySQL or PostgreSQL

I am out of my depth a bit perhaps but submit this query hoping someone has some experience importing large (11.2GB) tab delimited text file (2.2GB tar.gz file) into either MySQL 5.5.41 or PostgreSQL ...
0
votes
2answers
160 views

How can I use 'system pwd' command with MySql CONCAT() function?

How can I use 'system pwd' command with MySql CONCAT() function? I tried select concat('test', system pwd); gives me ERROR 1583 (42000): Incorrect parameters in the call to native function ...
3
votes
5answers
28k views

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

I have developed an application in VB6, and am using an online MySQL database server for storing my application's data. The first time I try to connect to my database server is successful, but after ...
0
votes
1answer
20 views

list of items or menu in mysql workbench

i am creating a database for an android tourism app. i am working on MySQL workbench, i want to create a menu in my database, for example i want to list the cities of my country, or list the ...
0
votes
1answer
56 views

query slows down exponentially as table grows

I have the following query running on mysql 5.6 on my CENTOS server select tb1.field2, tb1.field1, tb2.field1 from dns.table1 tb1, dns.table2 tb2 where tb1.field2 = tb2.field2 and tb1.field1 != ...
0
votes
0answers
327 views

MySQL ALTER TABLE table_name AUTO_INCREMENT=1 doesn't work

I'm using yii and it's test system. Yii's fixture manager resets tables and their AI keys so: DELETE FROM table_name; ALTER TABLE table_name AUTO_INCREMENT = 1; It was working good on server before ...
-1
votes
1answer
69 views

MySQL:How much aprox disk space required for bin_log of the 80GB of DB?

I had total 80GB of database in MySQL server,and there is huge amount of trasaction are happend on daily basis,I need to be enable a bin_log so I required a recommendation how much disk space is ...
0
votes
1answer
193 views

How to limit the range of an insert-update to only look at certain rows/ rows with field value: X?

I posted something similar before, but am still unsure of the technical implementation --- I'm so close to being there to the finished product. I have a table of tickets, and a stream of ticket ...
-1
votes
2answers
1k views

Combining multiple rows into single column

The return from my MySQL statement displays an example below: id 1 | status | id 2 | name | category 001 | open | 011 | john | person 001 | open | 011 | john | male How would I combine the ...
0
votes
1answer
87 views

Database Design Question? Relationships and Form Data

I am working on a project that requires to store evaluation form data. Essentially, the a reviewer will fill out a form based on the performance of the person being evaluated. Now there is well over ...
1
vote
1answer
335 views

All users are having NO Privileges in phpMyAdmin

By mistake, I changed all the privileges of user 'root' in my MySQL Database. Not even a single privilege is having for that user. Now if I log in with another user I am able to access only one ...
1
vote
2answers
688 views

Mysql connect without username/password

I build a new website for a client (WordPress is underlying) and have access trough FTP to his webspace. He does not provide or even know more informations than this because he had taken it from an ...
3
votes
1answer
292 views

Migrating Oracle to MySQL: MySql Workbench Not Available

I am currently trying to migrate information from a query of a remote Oracle database to a local MySQL database. I have poked around and have found it has been frequently suggested to use the ...
1
vote
2answers
171 views

mysql import failed caused by overgrown general log file

I have a table about 70G in size. I took a backup using mysqldump. In the new server, I performed a restoration. time mysql -uroot -p TDB < TDB.sql Enter password: ERROR 3 (HY000) at line 58155: ...
0
votes
1answer
50 views

MySQL script writing slow

I'm using php and the exec() function to run 2 MySQL script files one after another The first file has approx 2k update statements (see below) in and is 114kb in size. UPDATE table1 SET is_active = ...
0
votes
1answer
53 views

auto increment for the table with 1000 of records in mysql

How to reset auto increment for the table with 1000 of records in mysql. I want it to start counting from 1 again.
0
votes
1answer
213 views

Shell script for partial table backup

I have multiple database in my MYSQL server and i want to take some particular tables backup from each database. can anyone help me in writting a shell script for this scenario.
0
votes
3answers
353 views

How do I do an outer join between all nested subqueries? (getting an error of 'OUTER' is not a valid input for this position) [closed]

I have this query: SELECT AVG(a.score) AS Average1, AVG(b.score) AS Average2, AVG(c.score) AS Average3 FROM (SELECT subfactor.score, dateID, EmployeeID FROM employeescore LEFT JOIN ...
0
votes
1answer
51 views

Query results that not are in previous query result

I want to retrieve from my table the id_product of the products which haven't got some attribute and it's value is not the ones i want For example i want the id_product of the products in which ...
1
vote
3answers
1k views

MySQL: List databases with tables

Is there a way to list all my databases with tables in a single command? Expectation: mysql> SHOW DATABASES, TABLES; DB1 table1 table2 DB2 table1 table2 table3 ...
2
votes
1answer
135 views

BLObs – Should I Store In Database Or in Directory Structure?

BLObs – Should I Store In Database Or in Directory Structure I have been developing a database to replace an ageing data structure that contains 1000's of files within a directory structure. The ...
1
vote
2answers
687 views

Stored procedure to check if username exists

I'm trying to write a stored procedure So far I have this, but it always returns 1 CREATE DEFINER=`root`@`localhost` PROCEDURE `USER_EXISTS`(IN `USERNAME` VARCHAR(64) CHARSET utf8mb4) SELECT CASE ...
0
votes
1answer
593 views

How to pass the input parameters to dynamic Pivot stored procedure

This is my query: DELIMITER $$ DROP PROCEDURE IF EXISTS `leavemanagement`.`SP_ViewAttendance` $$ CREATE PROCEDURE `leavemanagement`.`SP_ViewAttendance` ( IN in_branch_id varchar(10) ) BEGIN ...
4
votes
4answers
177 views

Should I normalize my string arrays, or just keep it a simple string?

I am working on a project involving cards from the Magic: The Gathering game. To be of any use, I must load the basic information about each card into my database, but some of the fields may contain ...
3
votes
2answers
4k views

Merge multiple columns into one column in different table?

I've done this before, but I don't remember how. I need to select all rows from several columns in one table and insert them into one column in a different table while keeping them all on separate ...
0
votes
2answers
66 views

Compare values in SQL having dots

I'm comparing values from two different database. In one table the name is stored with dots(i.e A.B C) and in another table the same value is stored as AB C(i.e in second table none of the names ...
-1
votes
1answer
28 views

restore mysql 5.0.77 backup to mysql 5.5 [closed]

I am having backup of mysql version 5.0.77. I want to restore backup of 5.0.77 to our new machin having mysql version 5.5 What is the procedure?
1
vote
3answers
273 views

Prepopulate database with empty / null values [mysql]

What would be the best way to pre-populate a database with 100 empty fields and then begin the Auto_Increment? What I mean to say, I want to reserve the first 100 userfields (ie UIDs which are ...
0
votes
2answers
107 views

MySQL replication - how to read from slaves? manually?

MySQL Manual - Replication: "Scale-out solutions - spreading the load among multiple slaves to improve performance. In this environment, all writes and updates must take place on the master ...
1
vote
1answer
180 views

MySQL Replication Master Slave Architecture - Web app that is based on the SLAVE DB

We are developing a web application (Spring mvc based app) that uses a MySQL DB. (lets call it the "original app") The DB architecture uses a MASTER-SLAVE configuration with replication. The web app ...
0
votes
1answer
26 views

Adding a column to aggregated data where new value only applies to a subset of the aggregation

Having trouble explaining this. I have a table like this: Label | Value A | 3 B | 1 C | 4 And another like this: Label | Value | ID A | 1 | ID1 A | 1 | ID2 C ...
0
votes
1answer
118 views

MySQL Replication, Can i add a trigger to the SLAVE db?

Is it possible to do so? The trigger will insert some rows into a unique table that exists only on the slave.
0
votes
0answers
88 views

Very high CPU caused by mysql service

A running mysql service uses CPU in a crazy way. (See attached screenshot from htop) I followed the instructions here with no luck. My server specs: CPU: 1900Mhz . Intel Hexa-Core Xeon E5-2420 ...
-4
votes
1answer
45 views

MySQL Insert Performance

i've been tasked to check whether MySQL can be used for Large DataWareHousing Requirement is as following the Table contains 83 column each row pay load size is 1272 bytes the requirement is the DB ...