MySQL 5.1 : The Second Major Release of MySQL 5

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Take individual MySQL database offline

MySQL does not have any SQL commands or internal mechanisms for making an individual database unavailable / offline moving an individual database Thtis being the case, how can you take an ...
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150 views

Find MySQL Patch Level

What command do you use to find the patch level of MySQL? I am currently on 5.1.73. I need to find out what patches have been applied to this database. Thanks...
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81 views

MySQL After Update Trigger apparently not running

I have the following After Update trigger on a MySQL table: CREATE DEFINER = 'root'@'localhost' TRIGGER phpbb_rathermenacing.phpbb_bbdkp_memberlist_AUPD AFTER UPDATE ON ...
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1answer
135 views

How big is a tmp table?

I've got an RDF table in MySQL 5.1 with the MyISAM engine. Here's the table definition: CREATE TABLE `node` ( `id` bigint(20) NOT NULL AUTO_INCREMENT, `graph` varchar(100) CHARACTER SET latin1 ...
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374 views

Mysql query is very slow

I am developing a website like any other social networking site using mysql. I wish it give people suggestion to my users, and I have implemented this functionality in my application, but It is ...
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13 views

MySQL - LOCK IN SHARE MODE for EXISTS query

I am starting a transaction and I need to check that a record exists, I don't need any values, but I need it to exist for the duration of the transaction for everything to remain valid. It's VERY ...
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33 views

GRANT EXECUTE ON PROCEDURE unable to USE database

I am attempting to grant a user execute privileges to a single stored procedure without any other privileges in a MySQL 5.1.45 instance. The stored procedure is defined with SQL SECURITY as DEFINER. ...
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22 views

Unable to show binary logs how to remove logs from mysql?

Server version: 5.1.50-log MySQL Community Server (GPL) Type 'help;' or '\h' for help. Type '\c' to clear the buffer. mysql> show binary logs ; PROBLEM Data directory is full I want to remove ...
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32 views

merge multiple fields of csv file while running mysqlimport command

I have a mysql table like this +----------------+--------------+------+-----+---------+----------------+ | Field | Type | Null | Key | Default | Extra | ...
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154 views

WordPress MySQL writes during “Flush Tables With Read Lock” are rejected instead of being queued

I'm running into an odd issue when setting MySQL into a brief read-only mode for backup. Reads continue fine during that "read only" minute, but writes are just rejected instead of being queued to ...
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217 views

Accuracy of mysqldbcompare vs other tools like pt-table-checksum

I was curious to hear what everyone's experiences are with using mysqldbcompare vs pt-table-checksum( from Percona Toolkit ) to find the differences between two MySQL databases. I have heard that ...
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492 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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133 views

How to restore MySQL database from Files

Primary hard disk where MySQL (version 5.1) was installed is crashed and I had to re install entire OS. I have all the files including ibdata1 file. How do I go about recreating and attaching database ...
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80 views

MySQL: How turning off the logging affect the performance?

OS: RHEL5 DB: MySQL 5.1.73 community edition DB size: ~1GB I have setup a testing environment and turned off all logging - general logs, binary logs, slow query logs etc. I am using Oracle ...
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creating deadlock for distributed database in mysql-(Testing purpose)

I need to create a deadlock for distributed database in MySQL for testing purpose with a simple sql query(without front end), can anyone good with MySQL query help me out in this with sample query. ...
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76 views

Merge/combine two queries with different dates

I have one query that runs a SUM statement based on daterange 1, and worked fine, and another query that run same SUM statement, but on a different date range. I would like to merge/combine the two ...
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87 views

MySQL: Sometimes query failed to use index

I have a complex query including join of 4-5 tables. 1 months back, I have optimized this query and it was using the index. Also, two months back, index of all tables had been rebuilt by just export ...
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292 views

why is this query taking so long?

+----+-------------+-----------+----------+---------+------+----------+--------------------------------------------------------+ | Id | User | Host | db | Command | Time | State | ...
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269 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 ...
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224 views

Database instance keeps restarting

From the past few days, our MySQL database instance has crashed and had to be restarted a few times. My MySQL version is 5.1.57-log. The CPU and memory usage was way below 50% during the crash time. I ...
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37 views

How does MySQL 5.1 use indexes?

I've read the docs for MySQL v5.1.x on how about the indexes are used, but I'm not sure I understood it properly. Suppose having the following MySQL table: CREATE TABLE IF NOT EXISTS ...
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34 views

Performance Issue on Centos Server (Mysql)

I have performance issue on my centos server (vps). I asked about it in serverfault and I was said there is a problem with mysql and ask here. Here is serverfault topic, you can find details. ...
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Replicating from MySQL 5.1 master to 5.6 slave failing because 'INSERT … VALUES (NOW())' results in 'Error_code: 1062'

I am migrating away from some old MySQL 5.1 servers to some new MySQL 5.6 servers. During this process, I'm creating a new MySQL 5.6 slave from an existing MySQL 5.1 slave, using the procedure in the ...
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ERROR 1644 (HY000) at line 1852: Unexpected content found in the performance_schema database

I was upgrading MySQL from 5.1 to MySQL 5.6 on a Linux server installed with RHEL6. I already have 5.1 installed and running with about 300GB of database data, so I want to do a in-place upgrade to ...
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MySQL Slow_log LOCK_TIME shows wrong values

I have installed MySQL 5.1.47 in Windows server and I had enabled slow query with slow query time as 10 secs and redirecting the output to table (mysql.slow_log). In my application I am calling ...
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21 views

The same timestamp in different MySQL versions

I read in mysql 5.6 SQL changes following text: TIMESTAMP columns not explicitly declared with the NULL attribute are assigned the NOT NULL attribute. (Columns of other data types, if not ...
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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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17 views

Index creation issue with MySql and Linux

MySQL Server database is installed on RHEL5.5 and db version is 5.6.20 Community Server. In MySQL database we have a table and it has 11,144 records. I am altering the table and adding index to it. ...
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13 views

Specific replication of Mysql databases

This is my current setup for testing replication. I have 3 VMs with the same config - CentOS 6.5 - MySQL 5.1 - Tungsten replicator The scenario that I need to implement is as follows Host1(Main ...
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48 views

How to synchronize locally two DB table in Master server in MySQL Server 5.6.19

I want to synchronize the locally two DB tables in Master Server. Suppose that first i have already table Employee in a Master Server. The Table Employee have already 20 fields records. Then i have ...
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107 views

mysqldbcompare showing AUTO_INCREMENT differences but there are no missing records

I am encountering a strange issue when using mysqldbcompare to compare two MySQL DBs(one is a master, the other its slave). I noticed that the tool notes that the AUTO_INCREMENT values of this ...
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56 views

Intermittent MySQL 5.17 issues - extremely slow queries

I am experiencing major issues with intermittent mySQL issues. To give some background the website runs optimally for the majority of the time, however 3-4 times a day queries that should take a split ...
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Differing AUTO_INCREMENT values between 5.1 vs 5.6 slaves

I have a MySQL 5.6.21 slave and a MySQL 5.1.73 slave that are both replicating from the same MySQL 5.1.73 master. I noticed that for several of the tables ( I said several because when I try to rerun ...
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128 views

mysqldbcompare shows checksum fail but row differences passes between MySQL 5.1 and 5.6 databases

I have started to try using mysqldbcompare to help me compare two databases(one is MySQL 5.1.73 and the other MySQL 5.6.21) that are each about 5 gigs with lots of tables, but the databases are ...
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10 views

MySQL Master Slave replication seems to affect whole solution

We are running 2 master slave pairs on a web application MySQL 5.1. The concept is to keep all data in sync so that we can via a config file point all customers at one master slave pair to do ...
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73 views

is there any limit of MySQL status variable value?

As we know MySQL status variable is a counter variable since the service start. MySQL service in my DB server restart every week (on sunday). Below is my observation since last few week: Suddenly ...
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Intermittent My SQL error: high cpu wio and cannot connect

I have a new deployed MySQL server with following specs: Server: 2CPU x 8 cores, 16GB RAM, 300GB hdd SAS RAID 1 OS: CentOS 5.11 MySQL: 5.1.73 Now I have a very strange and intermittent problem: ...
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48 views

How to handle too many instances of multiple tables?

If there is a table accessed by multiple DB threads ( for example 100) at a time then how many instances of that table will be opened? If I run show open tables and see that in_use column value of a ...
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error 1298 (hy000) unknown or incorrect timezone mysql

I'm following MySQL :: MySQL 5.1 Reference Manual :: 16.1.1 How to Set Up Replication guide. I'm using: # cat /etc/redhat-release Red Hat Enterprise Linux Server release 6.5 (Santiago) # rpm -q ...
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MySQL: What should I do if too many tables opened during peak hours?

In Peak hours: When I run below statement, I found around 100 tables out of 250 have opened. show open tables where in_use>0; There are around 10 tables for which in_use value are >50. Storage ...
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46 views

Get upcoming Birthdays including Jan 1st

I currently have a script that can get up-and-coming birthdays within "x" number of days: SELECT * FROM persons WHERE datediff(date_add(birthday, INTERVAL (YEAR(curdate()) - YEAR(birthday)) YEAR), ...
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31 views

Can it Possible to do Mysql Active - Active Replication between Redaht linux 6.4X and Ubuntu 12X?

I have small doubt regarding Mysql Active-Active Replication. Can it Possible to do Mysql Master-Master (Active-Active) replication in Mysql between Redhat Linux and Ubuntu? Thanks & regards, ...
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mysql logs same query multiple times or is it application problem?

I have temporarily switched on logging on the server. The site is used in the US and local time there was 4 in the morning so not many people are using it at that time. What I did was delete any logs ...
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29 views

Analize Query in MySQL Server 5.1

I try use MySQL Workbench 6 to analyze the cost, but they don't show the cost of query. How i get this costs?
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65 views

MySql - multi-column index using only null values from one column

I have a Innodb table with a index that looks at 3 columns. ColA is integer and always has a value. ColB is varchar and always has a value. ColC is datetime and sometimes has a value (NULL). My ...
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Best way to select rows containing a substring

I've a table named comments where comment is a field where comment will be stored. Now I want to find -1 within that comment. the -1 should be independent. That is, it should not be joined with ...
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The total number of locks exceeds the lock table size, even after increasing buffer pool size

I am trying to partition a table with 200 million records in it. This table already exists: CREATE TABLE linkmap_ntoken ( target_nToken varchar(200) NOT NULL, ntoken_hashcode int(15) NOT NULL, ...
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213 views

MySQl: slow query is not using index in joining

Below is the configuration of my DB server: Apache version : Apache/2.2.22 (Win32) mod_ssl/2.2.22 OpenSSL/0.9.8 PHP version : 5.3.13 MySQL version : mysqlnd 5.1.11 Windows Server 2008 Standard ...
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2k views

MySQL: High sort_buffer_size setting value

Thing is I was getting plenty of 131104 20:10:36 [ERROR] /usr/sbin/mysqld: Sort aborted with 256M and rather erratic behaviour in my load test. Now at sort_buffer_size = 1024M ...
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71 views

InnoDB data back in 3 months after OS shutdown

I've got an interesting issue last week that after shutting down an instance of mine, all data were back in 3 months (like a big rollback), even though there is no sign of crashing, recovery crash ...