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

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10
votes
2answers
284 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, ...
7
votes
2answers
11k 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. ...
6
votes
4answers
13k 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 ...
5
votes
3answers
3k views

Why query_cache_type is disabled by default start from MySQL 5.6?

We've upgraded to MySQL 5.6 and start seeing the loading of db server increased significantly, and finally found out the query_cache_type is defaulted to off start from 5.6. We enabled it again and ...
5
votes
1answer
398 views

Why does InnoDB table by default uses the UNIQUE constraint instead of the PRIMARY KEY?

In my MySQL database I have a table with 4 columns, the PRIMRAY KEY, two columns with a FOREIGN KEY CONSTRAINT and one UNIQUE index on all fields except for the PRIMARY KEY. The SHOW CREATE TABLE: ...
3
votes
1answer
991 views

Slower queries after upgrade from mysql-5.5 to mysql-5.6

There is lots written about how MySql 5.6 is faster than MySql 5.5 (e.g. http://dev.mysql.com/tech-resources/articles/mysql-5.6.html) but we upgraded our Amazon RDS instance (using the new upgrade ...
3
votes
2answers
101 views

SQL Question: Selecting different language versions based on availability

I have the following situation: I have a table that contains entries with language versions (German and English) as part of the key (the other part being a "name" field). However, not always both ...
3
votes
1answer
263 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 ...
3
votes
3answers
842 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, ...
3
votes
1answer
236 views

How to upgrade MySQL (5.5) production DB to 5.6 with minimal downtime

Our existing Database size around 200GB. We want to use consistent, parallel backups methods. For testing, I migrated my Development DB from 5.5 to 5.6 by running mysqldump with option ...
3
votes
1answer
531 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?
2
votes
2answers
238 views

Changing ORDER BY direction causes performance issue

I use MySQL 5.6, and I have two tables each with 16M rows: CREATE TABLE IF NOT EXISTS `newsstudios` ( `id` int(11) NOT NULL AUTO_INCREMENT, `title` varchar(255) COLLATE utf8_unicode_ci NOT NULL, ...
2
votes
2answers
2k views

mysqldump --single-transaction, yet update queries are waiting for the backup

If I use mysqldump --single-transaction, according to the docs it should do flush tables with read lock to get a consistent state and then start a transaction and no writers should be waiting. ...
2
votes
2answers
2k 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 ...
2
votes
3answers
336 views

Does MySQL 5.6 support fan-in replication?

I've known for quite awhile that Continuent's Tungsten Replicator supports fan-in replication (example). By fan-in replication I mean combining multiple datasources into a single instance (like a ...
2
votes
1answer
2k 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 ...
2
votes
2answers
293 views

Can anyone offer an opinion on handlersocket vs memcached performance in MySQL 5.6

I must say I was a little mis(un)-informed about the MySQL Memcached plugin which offers the same NoSQL like access to InnoDB tables as HandlerSocket, I had only had experience with entirely ...
2
votes
2answers
676 views

Can I move the undo log outside of ibdata1 in MySQL 5.6 on an existing server?

I've been growing concerned about the large size of ibdata1 that can never shrink even when using file-per-table on innodb Moving the undo log files outside seemed logical but this procedure seems ...
2
votes
1answer
234 views

InnoDB: “Only one log file found” after binary import

My first one on DBA... After successful upgrading a master MySQL server 5.5 to 5.6.17 (CentOS 6 VPS serer), I done and moved my binary backups to a slave server (same version 5.6.17 but different ...
2
votes
1answer
249 views

Why didn't MySQL keep the innodb_file_format after loading a mysqldump

I was loading a mysql dump today when I ran into ERROR 1118 (42000) at line 279: Row size too large (> 8126) Which I thought was weird because I know I had turned on row compression and was ...
2
votes
2answers
1k views

changing TEMPORARY TABLE default collation

when I use CREATE TEMPORARY TABLE to create a temporary table, the collation of this table is utf8_unicode_ci by default. why by default it is utf8_unicode_ci? How can I change the default?
2
votes
2answers
870 views

MySQL version confusion

How is this possible: I installed mysql-5.6.11-osx10.7-x86.dmg which is supposed to be version Mac OS X ver. 10.7 (x86, 32-bit), DMG Archive (32 bit!) But upon SHOW VARIABLES LIKE "%version%"; I get ...
2
votes
1answer
280 views

Can't query one view from another?

Okay, I'm moving a database from SQL Server (which I already miss) to MySql 5.6. I'm having a problem creating a list of valid dates. In SQL Server I just used CTEs to build up numbers, then months, ...
2
votes
3answers
188 views

How can I make MySQL client read password from mylogin.cnf?

I'm trying to make the mysql client connect to a mysql server without requiring the password to be given interactively. Steps taken: 1) First create a mylogin.cnf file $ mysql_config_editor set ...
2
votes
2answers
675 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 ...
2
votes
0answers
835 views

How to do While Loops?

How can we use while loops in MySQL? My test script: BEGIN SELECT 0 INTO @n; WHILE @n < 10 DO SELECT @n; SET @n := @n +1; END WHILE; END; But it has syntax errors. I've also ...
2
votes
1answer
369 views

Optimize table and query, aggregate by date or date-hour

I have a table storing sensor data (100M rows currently) from stations from different sites. In my case, sites may have many stations. Create table statement is as follows: CREATE TABLE sensor_data ( ...
1
vote
1answer
44 views

MySQL replication slave of slave not receiving updates

I have 4 servers: A, B, C and D. A and B are in a master-master setup. C is a slave to B and D is a slave to C. Changes on A or B get to all nodes other than D. I need them to get to D Changes ...
1
vote
1answer
28 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 ...
1
vote
2answers
4k 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 ...
1
vote
1answer
94 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 ...
1
vote
1answer
561 views

MySQL crashes frequently on a Windows server

I have been facing an issue with MySQL crashes since last week. I don't know what exactly is happening. When I look at the Windows logs, I see the following error message: Faulting application name: ...
1
vote
1answer
536 views

How performance schema in mysql 5.6 improve performance?

Since MySQL 5.5 performance_schema database has been added likewise information_schema. As we know that tables in information_schema contains statistical information like tables, plugins, partitions, ...
1
vote
1answer
93 views

Migrating MyISAM tables from 5.5 => 5.6

I was wondering if anyone had any pointers on migrating MyIASM tables from mysql 5.5 to 5.6, specifically using Percona builds, via an rsync? Is this safe? I know we need to do a full ...
1
vote
1answer
348 views

New users not working on MySQL 5.6 in Amazon RDS

I'm using the CREATE USER and GRANT commands as mentioned here http://dev.n0ise.net/2012/09/amazon-rds-mysql-add-additional-users-with-limited-previledges/ When I try to connect I get this in MySQL ...
1
vote
2answers
56 views

User, host, and privileges

In a MySQL 5.6 database I found one user 'foo'@'10.0.0.2' with ALL PRIVILEGES. I also discovered an user 'foo'@'10.0.0.3' granted only USAGE privileges. Does this second user definition make sense? ...
1
vote
1answer
36 views

'accidentally' set 'CHANGE MASTER TO' on wrong server

while setting up the replication I accidentally did the 'CHANGE MASTER TO' on the master server instead the slave. When I noticed the mistake I just did a 'STOP SLAVE' on the master and setup the ...
1
vote
1answer
84 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. ...
1
vote
1answer
48 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 ...
1
vote
1answer
210 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 ...
1
vote
1answer
344 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 ...
1
vote
1answer
45 views

Change column without interrupting service

We need to change the data type of a column in a large table (~1.7 GiB) from VARCHAR(1024) to VARCHAR(512) in order to be able to create a secondary index over two columns. We're using MySQL 5.6 with ...
1
vote
1answer
295 views

MySQL InnoDB table accepts Non-Existent Foreign Key

Using EasyPHP 14.1 VC11 and phpMyAdmin (4.1.4) to create a website project in my home computer. The MySQL version is 5.6.15 according to the EasyPHP administration page. Working on Windows 7 64-bit. ...
1
vote
2answers
152 views

MySQL 5.5 to 5.6 Upgrade. Will data remain the same?

We are considering to upgrade to MySQL 5.6 this summer. I would like to know if our data will be changed in any way once we perform the upgrade? I've been reading and I found that mysql_upgrade ...
1
vote
1answer
611 views

Data lost in MySQL InnoDB after crash

I found a 6-days rollback in a MySQL 5.6 community edition server installation. It seems that some logs were lost, and I cannot understand why. 2013-12-22 20:38:54 380 [Note] Plugin 'FEDERATED' is ...
1
vote
1answer
780 views

GeomFromText in trigger has error

I have this trigger: DELIMITER $$ CREATE TRIGGER geometrytrigger BEFORE INSERT ON users FOR EACH ROW BEGIN SET NEW.user_geometry=GeomFromText(NEW.user_geometry); END$$ DELIMITER ; when I insert a ...
1
vote
1answer
185 views

Updating an FTS indexed column returns “Invalid InnoDB FTS Doc ID”

Environment: Ubuntu 12.04 (and 13.04) MySQL 5.6.11 I have a table which has a full text index on it (real table has much more columns and rows): DROP TABLE IF EXISTS articles; CREATE TABLE ...
1
vote
1answer
4k views

Issue on mysqldump in MySQL5.6

I did upgrade the MySQL server from 5.5 to 5.6 I am trying to take dump for a table like this mysqldump -uroot -p dba admin > D:\admin.sql But it gets following error mysqldump: Couldn't ...
1
vote
1answer
348 views

Issues converting MyISAM table to InnoDB (auto column issue)

I'm having issues trying to convert a table from MyISAM to InnoDB in MySQL 5.6. The following is the table dump: -- -- Table structure for table `companies` -- DROP TABLE IF EXISTS `companies`; ...
1
vote
1answer
2k views

MySQL 5.6 OS X 10.8: how tell if my.cnf read?

With mysqld running, I expect to see that /etc/my.cnf has been used by at least one of the commands ps aux | grep mysql | grep -v grep mysqladmin variables | grep defaults-file showing the value ...