Planet MySQL Planet MySQL: Meta Deutsch Español Français Italiano 日本語 Русский Português 中文
10 Newer Entries Showing entries 61 to 70 of 183 10 Older Entries

Displaying posts with tag: MySQL 5.6 (reset)

Running MySQL 5.6 on Amazon RDS: Webinar followup questions answered
+1 Vote Up -0Vote Down

Thanks to everyone who attended last week’s webinar, Running MySQL 5.6 on Amazon RDS.” If you weren’t able to attend, the recording and slides are available for viewing/download (or, if you were able to attend and just want to see it again). I’ve also answered the questions I didn’t have a chance to field during the event:

Q: Would you recommend Amazon RDS over manually setting up MySQL/Percona server on an EC2 instance?
A: This depends on many factors including your data set size,

  [Read more...]
Running out of Disk Space? Move innodb-tables to another partition (with MySQL 5.6)
+0 Vote Up -0Vote Down

Recently i had to manage big database installation that was running out of disk space. The partition on which the mysql datadir was located only had a few gigabytes free. Resizing the partition was not possible without a long downtime so that was no option. The installation had only innodb-tables so using symlinks was also not possible.

Luckily they were using MySQL 5.6 and the server had another partition with more than enough disk space available so i decided to use that partition for the biggest tables.

First get the 15 biggest tables:

root@mysqlserver [(none)]> set global innodb_stats_on_metadata=0; select table_schema, table_name "Table Name",round(sum(data_length+index_length)/1024/1024/1024,4) "Size (GB)" from information_schema.tables group by table_schema,table_name ORDER BY
  [Read more...]
Cloning MySQL 5.6 instances
+1 Vote Up -0Vote Down

A tip for all those cloud users that like cloning database servers (as reported in my book Effective MySQL – Replication Techniques in Depth).

Starting with MySQL 5.6, MySQL instances have a UUID. Cloning servers to quickly create slaves will result in the following error message.

mysql> SHOW SLAVE STATUS\G
...
  Last_IO_Error: Fatal error: The slave I/O thread stops because master and slave have equal MySQL server UUIDs; these UUIDs must be different for replication to work.
...

The solution is simple. Clear our the file based configuration file (located in the MySQL datadir) and restart the MySQL instance.

$ rm -f /mysql/data/auto.cnf
$ service mysql restart
Amazon RDS with MySQL 5.6 – Configuration Variables
+3 Vote Up -0Vote Down

One longstanding complaint I have heard for the past several years, and still hear today, is that Amazon’s Relational Database Service (RDS) does not allow the configuration flexibility as running MySQL in an ec2 instance. While true, this ignores the consistent work that Amazon has done to provide access to the most important configuration variables needed to tune a MySQL instance (after all, how relevant is it for a customer to set bind_address in an RDS instance).

Let’s take a look visually:

  [Read more...]
MySQL Security: Armoring Your Dolphin
+1 Vote Up -0Vote Down

My colleague and teammate Ernie Souhrada will be presenting a webinar on Wednesday, August 21, 2013 at 10 a.m. PDT titled “MySQL Security: Armoring Your Dolphin.”

This is a popular topic with news breaking routinely that yet another Internet company has leaked private data of one form or another. Ernie’s webinar will be a

  [Read more...]
Understanding max_connect_errors
Employee +3 Vote Up -0Vote Down

To only slightly misquote one of the greatest movies of all times:

You keep using that option.  I do not think it means what you think it means.

 

Perhaps like many users, I had certain assumptions about what max_connect_errors really does – but in looking closely as part of investigating the new PERFORMANCE_SCHEMA.HOST_CACHE table in MySQL 5.6, I learned that some very fundamental elements had escaped my notice.  I’m writing this blog post to help others who hold similar misconceptions of what this option does.

Many, if not most, MySQL DBAs are familiar with “host blocked”

  [Read more...]
Percona Server 5.6 Webinar follow-up and Q&A
+1 Vote Up -0Vote Down

Good news everyone! I recently presented a webinar: Percona Server 5.6: Enterprise Grade MySQL. It was also recorded so you can watch along or view the slide deck. As with all my talks, I am not simply reading the slides so it really is worth to listen to the audio rather than just glance through the slide deck.

There were a number of great questions asked which I’ll answer below:

Q: How does Stewart feel about this version of 5.6 taking into consideration “Stewart’s .20 rule?” (ref 2013 Percona Live Conference).

A: For those who aren’t familiar with it, I have a rule which I call “Stewart’s dot twenty rule” which I’ve posted a few times about on

  [Read more...]
Spring Cleaning: Useless protocol commands
Employee +2 Vote Up -0Vote Down

In an earlier post, I commented on clients and utility programs which seem to no longer be useful, and opened (or referenced existing) public bug reports to deprecate and remove, where appropriate.  That effort came actually was the product of a different initiative:  I was looking for clients which might leverage the full spectrum of MySQL protocol commands in an effort to understand whether certain protocol commands are in use.  I thought I would share my observations, in the hope that we might also get feedback from others regarding usage of these commands. And even though it’s no longer spring (I started this post in April), I finally found time to finish this post.

The

  [Read more...]
Practical P_S: Fixing gaps in GLOBAL STATUS
Employee +1 Vote Up -0Vote Down

Over three years ago, I noticed that there was no STATUS counter for COM_PING commands – something that is useful for ensuring proper configuration of JDBC connection pools.  Mark Leith even provided a patch, but it’s never been incorporated.  With the advances PERFORMANCE_SCHEMA makes in MySQL 5.6, that’s OK – a STATUS counter becomes somewhat redundant:

mysql> SELECT SUM(count_star) as pings
    -> FROM events_statements_summary_global_by_event_name
    -> WHERE event_name = 'statement/com/Ping';
+-------+
| pings |
+-------+
|    12 |
+-------+
1 row in set (0.02 sec)


Not only does PERFORMANCE_SCHEMA provide capabilities which mirror the STATUS

  [Read more...]
Standalone MySQL Utilities Now GA! Includes running mysqlfailover as a daemon
Employee +3 Vote Up -0Vote Down

With the release of MySQL Utilities 1.3.4, the standalone (not bundled with the MySQL WorkBench GUI) package is now Generally Available and fully supported. This post will focus on a very important change (the ability to run as a daemon rather than in a terminal) to the mysqlfailover utility which allows you to build a light-weight HA database solution using MySQL Replication.

For a general overview of MySQL Utilities,

  [Read more...]
10 Newer Entries Showing entries 61 to 70 of 183 10 Older Entries

Planet MySQL © 1995, 2014, Oracle Corporation and/or its affiliates   Legal Policies | Your Privacy Rights | Terms of Use

Content reproduced on this site is the property of the respective copyright holders. It is not reviewed in advance by Oracle and does not necessarily represent the opinion of Oracle or any other party.