MySQL : Open-Source, Relational Database Management System

learn more… | top users | synonyms

1
vote
0answers
2k views

Why does CAST(1 AS SIGNED INTEGER) return a BIGINT on MySQL?

If I do CAST(1 AS SIGNED INTEGER) I always end up getting a BIGINT returned, for example: $ mysql -u root -p --column-type-info Enter password: --- Copyright and help message snipped for brevity --- ...
1
vote
0answers
113 views

#1046: No database selected in phpMyAdmin

I have a problem with phpMyAdmin. When I click on any database on the left I get an error like: SELECT tracking_active FROM.`pma_tracking` WHERE db_name = 'information_schema' AND table_name = ...
1
vote
0answers
14 views

MySQL: index statistics dropped when table dropped?

When a table is dropped, are its index statistics also removed? The reason I ask is that I was hoping to 'prep' the stats by running log playback via the percona-playback tool prior to cutting over ...
1
vote
0answers
35 views

“Binlog has bad magic number” - recoverying InnoDB tables

A system crash raised the error in the title. I've tried the suggestion here, but then I can't access any of my InnoDB tables. They are still there, but data is missing. The provided solution ...
1
vote
0answers
217 views

Missing rows in MyISAM tables with 10-20 billion records

I've got 2 tables with 10-20 billion records each. Currently these are in MyISAM (MySQL). They only require to be built and indexed once, after this only SELECT is used. They are currently ...
1
vote
0answers
2k views

mysql 5.6 GTID replication 'Got fatal error 1236 from master when reading data from binary log'

I Checked SHOW SLAVE STATUS error is "'Got fatal error 1236 from master when reading data from binary log: ''The slave is connecting using CHANGE MASTER TO MASTER_AUTO_POSITION = 1, but the master ...
1
vote
0answers
84 views

MySQL SSL Master-Slave replication not syncing

I have originally posted this thread on stackoverflow and after a comment I moved it here. The original post can be found here. I have setup a typical Master-Slave replication scheme for my MySQL ...
1
vote
0answers
47 views

mysql vs mongodb cache/load balancing

I have a system where users can 'like' content. There will likely be many hundreds of these likes going on at once. I'd like it to be AJAX driven so you get an immediate response. At the moment I ...
1
vote
0answers
149 views

mysql/mariadb: ifnull changes collation

It seems that 'ifnull' changes the default collation that is set to be used. I have tried on both mysql and mariadb: Server version: 5.5.34-MariaDB-1~precise-log mariadb.org binary distribution ...
1
vote
0answers
82 views

join performance, index vs. index+foreignkey

I'm using an orm framework that handles data (and its integrity) on top of mysql. So far I ignored foreign keys because the orm handles that just fine. I recently read that foreign keys can enhance ...
1
vote
0answers
234 views

InnoDB: error: space object of table

131212 10:35:18 InnoDB: error: space object of table 'main/wp_m_membership_levels', InnoDB: space id 119 did not exist in memory. Retrying an open. 131212 10:35:18 InnoDB: error: space object of ...
1
vote
0answers
132 views

MySQL Link to PHPMyAdmin/MS Access

I have a mysql database stored on a server via phpmyadmin. I want to link this to MS Access for other users. I often link mysql databases to MS Access which are stored locally, but never DB's stored ...
1
vote
0answers
83 views

Schema for yearly data models

I am developing a school management system. Most data will not be reused after the end of the school year. I am contemplating using schemas to separate data in various school years, however I am ...
1
vote
0answers
126 views

MySQL join query indexes

After recently discovering the MySQL feature to log queries that aren't using indexes, I've been chasing these down in a large app, looking for places to improve performance. There is at least one ...
1
vote
0answers
39 views

Find the neighbouring polygons of a given polygon in a MySQL spatial table in ver < 5.6.1

Finding neighbouring shapes in MySQL spatial table made up of ID and 2D geometry (polygon) fields. I have a table with an ID column and a geometry column (holding a polygon) representing various ...
1
vote
0answers
133 views

Cumulative Function in MySQL

i have a problem creating cumulative function in mysql database. let say i have a stored procedure which getting data and counting quantity/sum_quantity example A table consist of consumer goods ...
1
vote
0answers
649 views

Analyzing MySQL crash due to corrupt InnoDB page. Failed page checksum

Lately we have been pestered by infrequent sporadic database crashes on one of our MySQL instances. Each time it is due to a failed page checksum. It happens on a specific database but spans multiple ...
1
vote
0answers
90 views

Migrate from Interbase to MySQL

I need to migrate a big database from Interbase to MySQL, I'd like to have suggestions about free and non-free tools to perform this task. I've found this one: ...
1
vote
0answers
53 views

Help with Mysql with 100K+ Table

Hi im trying to develop a database design in which its gonna have 100K+ tables residing in it. My major concern here is will Mysql be able to hold that much amount of tables with no performance ...
1
vote
0answers
128 views

How to use variables in file paths in MySQL statements?

I have now a problem that I have to set paths through variables in queries like load data infile '/my/file/path/to/file.txt' into table database1.table2 fields terminated by '' lines terminated ...
1
vote
0answers
642 views

Fastest way to perform simple operations on 1 million rows

I have a simple table with more than 1 million rows in an InnoDB MySQL table. Here are the steps that I need to perform on each row: SELECT * FROM tbl where work_done=0 make some data processings ...
1
vote
0answers
80 views

MySQL: What criteria should I base my table column order/arrangement/grouping on?

Does the order, arrangement or grouping of columns with large (such as long text descriptions) and small (such as bit and tinyint) field types have any noticeable impact on MySQL (InnoDB engine) ...
1
vote
0answers
111 views

problem installing mytop , need a up to date tools for monitoring mysql

so i'm trying to installl mytop to monitor the database i'm following this instruction : http://www.sohailriaz.com/how-to-install-mytop-a-top-clone-for-mysql/ when i try to install it with yum i get ...
1
vote
0answers
158 views

How to upgrade MySQL 5.0 to 5.5 with master-master replication?

I have to update 2 hosts with SUSE Linux Enterprise 11 from SP2 to SP3 which implies an update from MySQL 5.0.94 to 5.5.31. The release notes state: SLE 11 SP3 introduces the upgrade of the MySQL ...
1
vote
0answers
73 views

Configuring MySQL for Power Failure

I have absolutely no experience with databases and MySql. Now the problem is I have an embedded device running a MySQL database with a web based application. The problem is when I shutdown my embedded ...
1
vote
0answers
129 views

Mysql replication trouble with event_scheduler

I'm running replication Master-Slave in MySQL 5.5. One day, my replication is broken. The show slave status given me 1032 error: Last_SQL_Error: Could not execute Update_rows event on table ...
1
vote
0answers
108 views

What is the most efficient way to create new MySQL database

I need to setup a development environment for several developers. Each of them needs to test the software with a "fresh" MySQL database. There is a SQL file with many CREATE, ALTER and INSERT queries. ...
1
vote
0answers
1k views

Does MySQL close cursor if stored procedure encounters an exception?

I've seen two different approaches of cursor handling is MySQL stored procedures. Now I'm curious about their stability, due to potential MYSQLEXCEPTION risks in stored routines. Assuming, that ...
1
vote
0answers
89 views

MS SQL Server: Can Unicode columns include non-unicode values?

I need to convert UNICODE column values from UTF16-LE to UTF-8 to then import into MySQL. Is it safe to assume columns of NVARCHAR, NTEXT, NCHAR, BIT, INT, DECIMAL, FLOAT, and DATETIME all MUST be ...
1
vote
0answers
137 views

Getting distinct list of records based on the MAX of a column

I have a status table (tblTestActionStatus) which has three columns ID_TestAction: references some test action ID_Status: a look up table reference for the variety of possible statuses for the ...
1
vote
0answers
67 views

MySQL hang during “show collation” on Amazon RDS

MySQL is hanging when I try to do SHOW COLLATION on my Amazon RDS instance. I can use SHOW COLLATION fine with my local database, and other SQL commands work fine on my RDS instance. But Amazon SHOW ...
1
vote
0answers
219 views

MySql Very Slow Writes & Out of memory error

I am having a rds db instance in AWS which is used by Drupal 7 instatllation. I am getting the below error messages in the log: > 130912 11:57:39 [ERROR] /rdsdbbin/mysql/bin/mysqld: Out of memory ...
1
vote
0answers
400 views

How do I convert unicode data from UTF-16LE to UTF-8 when migrating from SQL Server to MySQL?

Objective: Ensure existing Unicode (UTF-16LE) data is displayed the when moved to MySQL (UTF-8). Background: I'm migrating 1TB from SQL Server to MySQL. The current Collation in SS is ...
1
vote
0answers
230 views

why is this query taking so long?

+----+-------------+-----------+----------+---------+------+----------+--------------------------------------------------------+ | Id | User | Host | db | Command | Time | State | ...
1
vote
0answers
94 views

How to index for a group by with columns from different tables?

Is it possible to create an index from columns of 2 different tables? If not, how do we optimize a query that does a group by on columns of 2 different tables? For example: the following ...
1
vote
0answers
95 views

MySQL Replication fails - commands received in wrong order?

The other day, I had this issue with one of our MySQL 5.1.60 master and 5.1.61 slave setups: Last_Error: Error 'Can't create table 'foobar.#sql-4b87_2' (errno: 150)' on query. Default database: ...
1
vote
0answers
44 views

What is the smallest encoding?

I am now using latin1 (CHAR 10 column type) and I was wondering if there is more efficient character-set to store password hash consisting of a-z0-9 characters.
1
vote
0answers
454 views

Incorrect information in .frm file after a power outage?

CentOS release 6.3 (Final) x86_64 mysql Ver 14.14 Distrib 5.5.31, for Linux (x86_64) using readline 5.1 SHOW SLAVE STATUS\G: Slave_IO_Running: Yes Slave_SQL_Running: No ...
1
vote
0answers
110 views

Mysql performance issue when selecting text column

I have a performance problem when selecting rows containing text fields: SELECT id FROM message WHERE NOT(message.sender_id = 368352 AND message.is_deleted_sender = 1) AND ...
1
vote
0answers
239 views

What is the best way to manage user access to MySQL via PHP?

I am working on a web application that requires auditing db queries in MySQL. In every application that I have developed or worked on it is standard practice to store the DB credentials in a protected ...
1
vote
0answers
161 views

mysql.sock missing

I started my MYSQL database this morning but failed. And I tried all means I can think of: chown -R mysql.mysql /var/lib/mysql chmod g+w /var/run/mysqld chgrp mysql /var/run/mysqld chmod -R 755 ...
1
vote
0answers
69 views

MySQL probelm in port: 3306

All websites on my VPS getting very slow, after dedcting the problem found that there are a line take 99.9% of the CPU: /usr/sbin/mysqld --basedir=/usr --datadir=/var/lib/mysql \ ...
1
vote
0answers
83 views

Mysql encrypted database contents by proxy?

Forive the amateur nature of this question. I work with Wordpress, often transforming the vanilla flavour into custom made versions for clients. Increasingly clients require more and more marketing ...
1
vote
0answers
22 views

How do I configure MySQL to store specific entire InnoDB tables on a different drive in Windows ( Server )?

After skimming the MySQL ( 5.5 ) docs on Partitioning, that seems to deal with breaking parts of the same table off onto other drives. I'm struggling to find information on how I pinpoint an ...
1
vote
0answers
221 views

Need to search users by latitude and longitude

I'm still learning SQL and this is a bit more advanced than my capabilities, so I could use some help. I think I need a sub-query or something. In the database I have a table called user with a ...
1
vote
0answers
81 views

MySQL Master-Master Replication Table Row COUNT() Inconsistency

I have two MySQL servers replicating to each other in a Master-Master typology. This has been working fine for several months now. Recently I've noticed some drift in one Master. There is a row ...
1
vote
0answers
203 views

Fulltext search returning too many rows

Server: MySQL 5.1.66-0+squeeze1 My problem: I have two databases with the same tables. One is for the testing environment and one for production. When I perform a MATCH AGAINST on the prodution ...
1
vote
0answers
510 views

SELECT + INSERT + Query Cache = MySQL lock up

MySQL server seems to constantly lock up and stop responding on certain types of queries and eventually (after couple of minutes of not responding) give up with an error "MySQL server has gone away", ...
1
vote
0answers
298 views

Delete operation mysql cluster

I am trying to delete some entries from table on a cluster and I get this error ERROR 1297 (HY000): Got temporary error 233 'Out of operation records in transaction coordinator (increase ...
1
vote
0answers
109 views

phpmyadmin Lock Down

I have a client that wants to use myphpadmin to manage his mysql database 5.x on my server. I found this article on how to hide databases from myphpadmin but I don't like this because if I don't ...