MySQL version 5.5 - please also tag with mysql for search purposes.

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Why is loading data into MySQL cluster taking so long?

I have a mysql-5.5.22 ndb-7.2.6 cluster 64bit running on Centos 6 with each node installed on the same Citrix Xen Server communicating via a virtual private network. Each node has 4GB of RAM, 4 vCPUs ...
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10k 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 --- ...
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415 views

Using SSL produces error “protocol version mismatch”

Using MySQL Server (5.5.46-0) on Ubuntu 14.04.2 with protocol version 10. Configuring SSL and defining SSL cert files locations in My.cnf file. Have defined absolute paths for CA-cert.pem, server-...
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117 views

MySQL: Is the read committed isolation level safe with mixed binary log format?

When using the MIXED format with the READ COMMITTED isolation level, am I safe? The docs state (http://dev.mysql.com/doc/refman/5.5/en/set-transaction.html#isolevel_read-committed) If you use ...
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46 views

Database Architecture & Design

I am building a web application for project management which will be hosted on my servers. My application design is like this 1 - user register 2 - domain name will be created i.e abc....
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66 views

Identifying table causing runaway rollback in MySQL 5.5 (InnoDB / Windows)

I have a large database (180 GB), running under Windows, with a runaway rollback that starts running as soon as the database is started up. I have started the database with innodb_force_recovery=3 ...
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40 views

Composite index works for larger set of data, but not smaller

This is a follow on question to optimise my.ini for key query Data model: DROP TABLE IF EXISTS `contract`; CREATE TABLE IF NOT EXISTS `contract` ( `id` int(11) NOT NULL AUTO_INCREMENT, `...
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581 views

How do I recover from MySQL InnoDB table/index corruption?

While trying to upgrade a database (in place) I got the following error. The server starts up and everything seems to be fine, except that the table mentioned in the message is no longer accessible. ...
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54 views

Emulating WITH clause in MySQL/query perfomance review

I have never really worked with MySQL queries till this last week. I was tasked with making a simple tool for my department that tracks contacts. Here are the 2 tables and the type of data they ...
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602 views

Upgrading from MySQL 5.5 to 5.6 - timestamp issue?

I'm looking at upgrading my Percona Server setup from 5.5 to 5.6. Reading the upgrade docs from MySQL sounds mostly straightforward except for anything involving time/date columns. As far as I can ...
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106 views

Understanding Indexes and using them better

I've been spending some time trying to optimise our MySQL queries that we use which essentially joins one table with 2 million rows onto another which has 1-2 million. I know MySQL is able to easily ...
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217 views

Error in alter table reorganize partition for MySQL Cluster

My cluster contains 48 million rows and cluster contains 4 storage nodes . After that I add online storage node and executed alter table 'customer_tbl' reorganize partition. Some parameters of config....
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41 views

MySQL 5.5 Continuously getting crashed

I have MySQL 5.5.44 running in RHEL server. It is a standalone server used for testing and offlate not much used. The instance is currently down. Hence, I tried to start the service. It got started ...
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12 views

MySQL replication just hangs, then Database wont shutdown

I have recently set up some new MySQL Databases on a remote site. They are all 5.5.47, running on Debian Servers. They are set up as one Master with multiple slaves. The Master is itself a slave from ...
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19 views

Mysql InnoDB relations vanish when exporting/importing to online database

My issue is the following : I have a local database running on EasyPhp server : WEB serv : Apache/2.4.7 (Win32) PHP/5.5.8 DB serv : 5.6.15-log - MySQL Community Server (GPL) PHPMYADMIN : version 4.1....
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22 views

my ssh is ok but masterha_check_ssh is fail

my environment is vmware12 + centos6.6 + mysql5.5 + mha4mysql-manager-0.53-0.noarch.rpm + mha4mysql-node-0.53-0.noarch.rpm my structure is one master three slaves master 192.168.233.135 node ...
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45 views

MySQL 5.1 - Display the error-message returned inside a stored precedure

I'm trying to find an alternative to display the error-message returned from MySQL-5.1/5.5 inside a stored procedure. The example below is what I'm looking for, however it's seems to be only allowed ...
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33 views

What is the maximum value for the index_length of a MySQL 5.5 table?

I'm trying to find out why a series of inserts is painfully slow (1 minute 15 seconds, on average) on a dedicated MySQL 5.5.47 server, while the same inserts are normally fast (less than 5 seconds) on ...
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3k views

mysqld upgrade 5.5 -> 5.6 mysql Error: Failed while fetching Server version! Could be due to unauthorized access

After updating mysql with yum to 5.6 I am getting such an error message when trying to run mysql [root@host rpm]# mysql_upgrade Looking for 'mysql' as: mysql Looking for 'mysqlcheck' as: mysqlcheck ...
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13 views

Trigger quest updating a column as data is entered in multiple columns at different times

What I am looking at is I have a project I'm doing and within it there is to be a column that would be turned into a GPA based off their individual assignment scores. My question is would it be ...
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23 views

MATCH(title) AGAINST('test 11' IN BOOLEAN MODE) can't search number

SELECT *, MATCH(title) AGAINST('test 11' IN BOOLEAN MODE) AS Score FROM search_table WHERE `date` > DATE_SUB(NOW(), INTERVAL 1 MONTH) AND MATCH(title) AGAINST('test 11' IN BOOLEAN MODE) ...
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47 views

What should be the best practice to alter the table using the script to shift columns

I have a MySQL table which has columns 93 in it. All first 92 columns are INT(11) and the last column is of type DATE. |number|0|1|2|3........|88|89|90|ddate| | | | | | ........| | | | | ...
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75 views

Proper database configuration

I'm running MySQL 5.5 on Debian 7.8. My entire DB is 2200 MB large (all tables are InnoDB), the mysql process is taking up to 6G RAM but still I think that not evrything is loaded in RAM I have large ...
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30 views

MySQL can't connect as user with password locally

I am running into a strange authentification issue. Users can't connect to MySQL locally using a password, but they can without one. mysql -h localhost -u someuser -psomepassword won't work ...
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changing mysql configuration . Getting errors like Table is marked as crashed and should be repaired

On Our server I have done following configuration for Database: [server has 2 core, 2 GB ram and windows 2008 operating system] query_cache_size= 32M [Old] query_cache_size= 50M ...
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364 views

Records not getting replicate from Mysql 5.5.32 to MySQL 5.6

I have a MySQL 5.5.32 server (community edition) on one Linux server which is master. I have a MySQL 5.6 server (community edition) on another Linux server which is slave. I have installed various ...
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MySQL - Truncated incorrect datetime value on update statement

I have an application which produces log files. These log files include a Timestamp field in the format 2015-08-25T09:35:01 UTC. (there will be apx 60 logs produced at 0.25 GB per day). I need to ...
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36 views

MySQL/Percona Audit Log Plugin Not Working

I've been looking to implemement the Percona Audit Log plugin. So far I have installed it and configured it, and it seems to be working ok. Except, I have installed it on a slave Database as I don't ...
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102 views

Update queries randomly slow on INNODB Mysql

I have been struggling with a slow update query. Have already tried using indexes and other query optimization techniques. I have been using MYSQL database with INNODB engine. The issue is that, ...
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50 views

Delete using join or using sub-query?

I need to delete rows from a table based on what is present in a temporary table. For me, both of these statements work : DELETE from main_table where `id` in (select `deletable_id` from ...
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776 views

Reclaim disk space after dropping table(innodb_file_per_table = ON), strange scenario

I know it is often asking question. But I can't find answer for my scenario with specific condition. We use MySQL 5.5 We have always(I am sure) innodb_file_per_table = ON option in our mysql ...
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74 views

Unsafe statement written to the binary log using statement format

In MySQL error log I am getting this warning message: [Warning] Unsafe statement written to the binary log using statement format since BINLOG_FORMAT = STATEMENT. Statement is unsafe because it ...
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26 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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Optimizing MySQL for write throughput ceiling

We have a large MySQL database on AWS RDS, with a huge table around ~1.8TB with massive write workload. We recently hit a write throughput bottleneck, which caps our provisioned IOPS way below the ...
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32 views

Does creating an empty table in MySql have any effect(downtime) on production?

Disclaimer: I am, in all probability, paranoid about pushing a patch on a production server. The patch alters the schema, by creating a new table (which is empty), and changes some stored procedures ...
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Server version (5.5.40-MariaDB) does not match with the version of the server (10.0.15-MariaDB) with which this program was built/distributed

I just upgrade MariaDB (Mysql) 5.5.40 to MariaDB 10.0.15 by following this step by step. I have failed to enable the mysql and also mysql_upgrade with the following errors mysql_upgrade -u root -p --...
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64 views

Can MySQL Index Merge an Composite index with a single column index?

I am tuning a query and currently have an index as following : Index 1 : (col1, col2) An example query would be : SELECT * FROM t1 WHERE col1 = '1' AND col3 = '2'; I have created an index on ...
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861 views

Lost Connection to mysql server at 'reading authorization packet', system error 0"

OK, this has been bugging me all afternoon now, I have a new MySQL Database '5.5.40-0+wheezy1-log' running on Debian Linux. It is to all extents and purposes a clean install. I have created two ...
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MySQL server: Unable to connect with root because of skip-name-resolve option

We had our MySQL server on an old server. We decided to move all of the databases to our new server. Old MySQL Server engine 5.5.31 New MySQL Server engine 5.5.38 We created one general dump file ...
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pt-online-schema-change with circular replication

So I have an alter table (adding 4 columns) to do on a fairly large table (74 million rows). The problem is this table has firstly to remain online and writable during the whole operation and ...
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197 views

Soundex on a Large Table

I had a table of names, containing 200,000 rows. This has now been updated to include over 11 million rows. The table is queried using a SOUNDS LIKE 'str' and the result is then passed through ...
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990 views

What to do with unused RAM on a MySQL database server?

For years I have been running dedicated servers with more or less limited ressources, resulting in unsatisfying performance of the web application (Drupal). Tools like Matthew Montgomery's MySQL ...
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142 views

Refactoring IN Subquery, Avoiding Query in a Loop

I've got a table which was designed as both the current data set for participants, as well as being the historical changeset for those participants. This table has been in use for approximately three ...
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MySQL query with order by decreased performance

Here is my schema: CREATE TABLE `UserMst` ( `UserID` mediumint(8) unsigned NOT NULL AUTO_INCREMENT, `EMailID` varchar(50) DEFAULT NULL, `UserName` varchar(20) DEFAULT NULL, `FullName` ...
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crossplatform mysql_install_db script in mysql 5.5.34 on Windows

I downloaded mysql-5.5.34-win32.zip and found out there is mysql_install_db.pl script. However mysql 5.5 documentation says: mysql_install_db is a shell script and is available only on Unix ...
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543 views

mysql doesnt have write access in data dir?

I am running a MySQL on my Windows 7 64 bit development machine at work and I can't seem to get around a database corruption issue. In my unit tests it is telling me that the storage engine (which is ...
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table scheme definiation it this way that insert duplicate into another table

I have a table in which there is a column name with SP varchar(10) NOT NULL. I want that column always to be unique so i created unique index on that column . My table schema as follows : CREATE ...
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925 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 ...
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656 views

MySQL InnoDB slow inserts

I'm currently struggling with an MySQL Community Server 5.5.27 when inserting large numbers of rows into a table. We're running a 24 core Intel Xeon machine with an SSD software raid array. I did some ...
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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 ...