MySQL 5.6 : Latest Release of MySQL with improvements that enhance every functional area of the database kernel.

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Question on turning on GTID for MySQL master and slaves

I came across the interesting article by Facebook's Engineering team where they were able to deploy GTID in MySQL at a large scale : ...
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In MySQL 5.6, schema changes in master blocks the slave?

I have a question with a MySQL 5.6 master-slave setup. If you were to modify the master's schema with an ALTER TABLE SQL query, when the slave tries to execute that ALTER TABLE statement too, would it ...
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19 views

Sudden (and drastic) decrease in commands/second on replicated slave

On a slave that uses statement-based replication from a failover of master (all running mysql 5.6), the number of queries executed per minute has suddenly decreased from ~20k during peak traffic to ...
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1answer
141 views

Mysql closing immediately after new installation

I am using mysql as an backend for my webapp ,the software ran without any glitch but today it gave unexpectedly ERROR:2003 i tried many solution on the internet but none worked. so reinstalled the ...
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2answers
6k views

InnoDB: Error: Table “mysql”.“innodb_table_stats” not found after upgrade to mysql 5.6

I upgraded to mysql 5.6 from 5.5, and now my logs are littered with such messages on startup I found a possible solution here, but it does not seem official. ...
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3answers
36 views

Question on having a MySQL 5.1 replicate from a MySQL 5.6 DB

I have a question in regards of what potential issues that might happen with a MySQL 5.1 DB that replicates from a MySQL 5.6 DB. I know the risks involved based on resources such as ...
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1answer
11 views

Mysql Server 5.6 Mysqld high memory consumption

I have MySQL Server 5.6 installed in a development machine with these specs: RAM: 4 GB Windows 7 Professional 64 bits Intel Pentium CPU G630 @ 2.70 GHZ Since I installed the MySQL Server, the ...
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1answer
140 views

Optimizing large table in mysql

I'm running mysql 5.6 and I am trying to optimize a large table without mysql recreating it. As a dry run I ran the same command (optimize table) on a smaller table in the same DB and mysql insists on ...
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1answer
103 views

Innodb issue is preventing MySQL from starting [closed]

For some reason mysqld refused to start after I rebooted my server. Now when I try to start it I will get the following error: [root@vps1 ~]# service mysqld restart ERROR! MySQL server PID file ...
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2answers
3k views

How to force higher values of open_files_limit or table_open_cache?

I'm having a frustrating problem where setting my.cnf to values higher than I currently have them does not 'take'. This is MySQL 5.6.14 on MacOS X 10.8.3 I'm trying to address dropped connections ...
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1answer
21 views

How do I add databases from a crashed MySQL 5.1 server to a new MySQL 5.6 server

I was running MySQL 5.1 on a personal web server that recently died. The system drive is non-operational, but I have my second hard disk where I had installed all of my programs. This drive has my ...
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3answers
534 views

Amazon RDS - and binary log rotation

New to RDS (used to having my own server in my own data center). We are on MySQL 5.6 on RDS. when a slave gets behind in replication lag, the master ceases to rotate out its binary logs. It is, ...
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1answer
39 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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20 views

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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1answer
19 views

How to investegate MySQL crash on windows?

I have MySQL 5.6.19 running on Windows Server 2008 R2. I have 3 servers A, B, C Server A is a stand alone server. This server had data that can't be placed on SERVER B (ie. users information.) ...
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1answer
149 views

add column without metadata lock in mysql 5.6

I am using MySQL Server version: 5.6.15 Homebrew. I need to add new null column. alter table requires no metadata lock. In order to avoid this MySQL 5.6 introduced algorithm=inplace. Here is the ...
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1answer
22 views

Myloader command: Table doesn't exist

I took the backup of mysql database using mydumper command: mydumper -B mydb -o /backup/oct3 -s 500000 -c -m -S /tmp/mysql.sock -u root -p password@123 -v 3 Now, I am restoring mysql database ...
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28 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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1answer
25 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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1answer
34 views

Using pt-table-checksum to compare a slave's DB to another slave

I understand that pt-table-checksum can do checksum compares between a master's DB and a slave's DB easily. However, let's say your master has two slaves replicating from it for the same DB, i.e. ...
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0answers
24 views

Using partitioned table, and dealing with auto_increment PK

I have a big table (>100 million rows) that tracks user's activities. It has an ID, which is PK and has auto_increment property. This is the only unique key. Table also has userid and datetime column. ...
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44 views

innodb slower much slower than expected

Trying to figure this one out and I apologize for not providing a lot of information from the start (if you need further let me know and I can try to provide it). Query is performing very poorly - it ...
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2answers
309 views

What is default MySQL binlog retention in AWS RDS?

I tried to retrieve my MySQL RDS binlogs in order to run manual "rollback" for some SQLs. Unfortunately, I noticed that only 2 binlogs for the last 30 minutes are available. "call ...
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0answers
57 views

MySQL has gone away with two connections

I'm using MySQL 5.6.19 on OSX 10.9.5 (DMG installation from mysql.com) and I'm receiving the infamous MySQL has gone away when I try to open two connections to this server. If I try connecting from ...
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1answer
271 views

Any known issues upgrading from MySQL 5.1.73 to 5.6.21?

I am planning my MySQL DB ver5.1.73 running on a CentOS 6.5 machine to MySQL 5.6.21. I understand the basic procedure for this based on what I have read on StackOverflow, but I was curious if anyone ...
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1answer
36 views

I noticed that my MySQL slave's DB size is smaller than the Master's DB

I have a very simple setup of a master MySQL DB with one slave MySQL DB replicating from it. Initially, when setting up the slave, I used mysqldump to get an initial DB dump from the master like ...
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1answer
13 views

Why MySQL init_connect variable gets updated after rebooting?

After SET GLOBAL init_connect=''; query everything works fine. However after rebooting the server or restarting the MySQL service it updates the init_connect value to some random value (OÇÿOÇÖ). Do I ...
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2answers
6k views

MySQL 5.6 Failure

I have the following in RPM_UPGRADE_HISTORY in /var/lib/mysql MySQL RPM upgrade to version 5.6.10-1.linux_glibc2.5 'pre' step running at Fri Mar 15 15:41:26 EDT 2013 ERR file(s): -rw-r----- 1 mysql ...
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1answer
51 views

Calculating difference between consecutive timestamps. Error when i reach the hour mark

I am using MySQL I have a table that contains among other things an id a time in the format date:time (YYYYhhmmss) and a readingvalue. The difference between each reading value is 300 seconds but ...
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1answer
64 views

MySQL service stops after trying to grant privileges to a user

I am using MySQL 5.6, I was trying to create a super user for specific database but I got ERROR 1396 (HY000): Operation CREATE USER failed for 'superuser'@'%' Then I thought maybe there is already ...
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45 views

Create separate temporary table/view and variables for every query

How can I create something similar to VIEW or TEMPORARY TABLE for every query separately? I have 1 process, it creates and holds one connection (doesn't destroy connection after request, so doesn't ...
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1answer
384 views

How to drop all scheduler events in MySQL 5.6?

In MySQL 5.6 is there a way to drop all scheduler events with an administrative command or do I have to go through them one by one with DROP EVENT [IF EXISTS] event_name?
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1answer
23 views

MySQL Server 5.6 wont start on Windows

I'm having an issue getting MySQL Server 5.6 (community edition) running. it was working just fine until I restarted my server. Now it wont start at all. after doing a bit of research, I discovered ...
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1answer
24 views

returning the number of columns in a row that are zero in mysql

I have a table that contains amongst other things a datetime column, and 4 other columns that contain either a zero or a number. I would like to return how many columns in a row contain a zero in ...
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1answer
28 views

Mysql - MyISAM Default order

We are using Mysql V5.6. We have a MyISAM table. when we open the table, the records will be displayed in some order instead of primary key order. Even when selecting the records will not be retrieved ...
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2answers
1k views

Master - Master replication Duplicate entry

I've got a Master - Master replication setup and it worked fine for a couple of days but I keep getting: Duplicate entry errors after a few days... My setup is as follow: One server in The ...
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2answers
49 views

MySQL excessive tmp disk tables after Upgrade to 5.6

After upgrading two MySQL-Servers which run Master-Slave replication from Percona MySQL 5.5 to Percona MySQL 5.6 an excessive amount of temporary Tables gets created on the slave. The Master seems to ...
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1answer
106 views

Is it mandatory to enable --log_slave_updates with MySQL Replication using GTID? [duplicate]

I'm setting up 5.6 Percona Mysql, in order to enable GTID should I have to enable log_slave_update on both Master and Slave ? If I should enable log_slave_update, then I'm counting this to CONS for ...
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1answer
37 views

Subquery on timestampdiff only allows for 1 result, how do I scale this for all results?

I'm currently writing up a query which is meant to output data to show curves of power profiles, and I'm facing a slight problem. So far, I've managed to do this: select datetime, PLANT_STATUS, ...
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2answers
117 views

mysql - query records to fetch by time stamp

I've a MySql 5.6 DB with a simple table (MyISAM) . | UniqueKey | TimeStamp | ------------------------- | 1 | 1024125412 | | 2 | 1024125413 | | 3 | 1024125414 | My table ...
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2answers
192 views

MySQL instance stalling “doing SYNC index”

Problem An instance of MySQL 5.6.20 running (mostly just) a database with InnoDB tables is exhibiting occasional stalls for all update operations for the duration of 1-4 minutes with all INSERT, ...
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1answer
26 views

How can I move a MySQL database from 5.1 to 5.6?

I have pretty big database, like with 5 000 000 rows in total. It is located in a remote server. I want to copy this database to my personal computer, for testing purposes. However I don't know the ...
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0answers
49 views

InnoDB says I'm in Deadlock when it should not be

I'll do my best to explain the situation. I'm at a complete loss. Preliminaries I'm running a Java Web Application in Tomcat 7.0 using a JDBC Connector to communicate with my MySQL Database. The ...
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1answer
1k views

MySQL does not start - Ubuntu 14.04 LTS after migration to new disk

I have installed in a Virtualbox VM a 64-bit desktop version of Ubuntu 14.04 LTS and MySQL Server 5.6. I had some databases in the machine's main virtual hard disk but then I was going to open a SQL ...
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13 views

Lower resolution of record on MySQL

The database I'm currently working on logs about 50 columns of data per second on our plant. The current high frequency logging is due to ongoing test. However, going long term, this would not be ...
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1answer
38 views

InnoDB compression: memory usage

InnoDB offers table compression for Barracuda-type tables and the recommendation seems to be to "adjust" buffer_pool_size. The documentation is rather vague about the definite impact of compression on ...
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1answer
2k views

In place upgrade from MySQL 5.5 to 5.6.11 removes all users from user table

On Windows, I upgraded from 5.1 to 5.5 no problem. Copied my 5.1 data folder into my 5.5 instance Started mysqld skipping grants Ran mysql_upgrade All good, but going from 5.5 to 5.6: Copied ...
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4answers
8k views

Cannot open table mysql/innodb_index_stats

After a fresh install of XAMPP and import from my linux live db that is working to the windows Dev-stage, I started encountering problems with INSERT. Everything else seems to work well. The errors I ...
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1answer
56 views

optimize the query with big and low cardinality

I have big enough dataset and few joins to get them all with help next query: SELECT DISTINCT c.c_id FROM c_active z1 INNER JOIN cs c ON (z1.cv_id=c.cv_id) INNER JOIN indi i ON (c.m_id=i.m_id) INNER ...
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1answer
119 views

MySQL 5.6.17 running out of memory when opening table with many partitions

We are currently setting up a MySQL database (version 5.6.17) on an Amazon db.m1.large RDS instance for storing time series data. Each time series property of an object is stored in a separate InnoDB ...