Showing entries 4091 to 4100 of 22549
« 10 Newer Entries | 10 Older Entries »
Displaying posts with tag: MySQL (reset)
How to store IP (internet protocol) address in MySQL?

Internet Protocol address is a special kind of data. This data does not correspond directly to available MySQL built-in data types. I have seen in many servers, the IP(Internet Protocol) address is stored in CHAR(12), VARCHAR(15), TEXT and so on. 

The dotted-quad notation is just a way of writing for better readability, it is not the original form of raw data. The IP address is a UNSIGNED INTEGERS they are not strings. 

So the question is how we can store the IP addresses with dot in integer columns? The MySQL provides the built-it function to do this operation. The functions are given below:







For IPv4 addresses:

INET_ATON()
mysql> select inet_aton('127.0.0.1');

+------------------------+
| inet_aton('127.0.0.1') |
+------------------------+
|             2130706433 | …
[Read more]
How ProxySQL deal with schema (and schemaname)

I think that very often we are so focus in analyzing internals, or specific behaviours/situations/anomalies that we tend to forget the simple things.

It happened to me that last week a couple of customers raise the same question:  "How ProxySQL manage the default schema, or the ones declared inside a FROM/JOIN?"
I was a bit surprise because I was given that for granted, and my first thought was, 'well read the documentation', but then I realize we do not have a clear section in the documentation about this.

Given that and also because I realize I had not done a full and extensive test on how the SCHEMA is actually managed.
I decide to do a simple set of tests and write down few lines.


This blog is to answer that very simple question:"How ProxySQL manage the default schema, or the ones declared inside a FROM/JOIN?"
The blog is split in two parts, part 1 …

[Read more]
Measuring CPU stall reductions from Dynimize

Duration: 30 min

Level: Intermediate

 

In this tutorial we are going to install and experiment with Dynimize using MySQL running the Sysbench OLTP benchmark. We also play around with the Linux perf command, top and vmstat. This tutorial assumes that you have MySQL and the Linux perf tool installed, and that there are no other CPU intensive workloads on the system other than those being tested. In order for the Linux perf tool to report CPU event counts, this tutorial should be completed on either a bare metal Linux server, or if using a virtual machine guest then virtual PMU support must be enabled by the hypervisor.

The initial part of this tutorial is meant to illustrate how to determine if there is potential for Dynimize to speedup a mysql (or any other program) workload, by checking to …

[Read more]
Migrating/importing NDB to Cluster Manager w/ version upgrade.

I’ve had some questions from people using MySQL Cluster GPL and wanting to move to using MySQL Cluster Carrier Grade Edition, i.e., they want to use MySQL Cluster Manager, MCM, to make their lives much easier, in particular, upgrading (as well as config change ease and backup history).

All I want to do here is to share with you my personal experience on migrating what’s considered a ‘wild’ NDB Cluster to a MCM managed cluster. It’s just as simple to follow the manual chapter Importing a Cluster into MySQL Cluster Manager so at least you can see how I did it, and it might help someone.

[ If you’re not migrating but just looking for further information on NDB Cluster, and came across this post, please please PLEASE look at the …

[Read more]
This Week in Data with Colin Charles: Percona Live Europe!

Join Percona Chief Evangelist Colin Charles as he covers happenings, gives pointers and provides musings on the open source database community.

Has a week passed already? Welcome back to the second column. A lot of time has been spent neck deep in getting speakers accepted and scheduled for Percona Live Open Source Database Conference Europe 2017 in Dublin, as well organizing the conference sponsors.

Percona Live Europe Dublin

At the time of writing, we are six weeks away from the conference, so a little over a month! Have you registered yet? …

[Read more]
MySQL Community team @Conferences in Aug-Sep 2017

It's our pleasure to announce that MySQL Community team is supporting multiple shows around the world. Please find a list of conferences & events where you can find us in August & September below:

NA&LAD

  • UbuCon LA,Lima, Peru, Aug 18-19, 2017

    • MySQL Community team is supporting this small Ubuntu conference in LAD as Platinum sponsor.  
  • Pacific Northwest PHP, Seattle, US, Sep 9-11, 2017
    • You can find our team at the MySQL Community booth in the expo area.
  • Madison PHP, Madison, US, Sep 22-23, 2017
    • MySQL Community team is supporting this PHP conference as Community partner.
[Read more]
MySQL Enterprise Edition Now in Docker Store!

I'm happy to announce that in addition to the official MySQL Community Edition Docker images, we now have official MySQL Enterprise Edition Docker images available in Docker Store! Now you can easily leverage the power of Docker with MySQL Community Edition or MySQL Enterprise Edition.  

 

What Does All of This Mean?

First some context and general info to help you understand this news a bit more. Docker is a …

[Read more]
Percona Monitoring and Management 1.2.1 is Now Available

Percona announces the release of Percona Monitoring and Management 1.2.1 on August 16, 2017.

For install and upgrade instructions, see Deploying Percona Monitoring and Management.

This hotfix release improves memory consumption.

Changes in PMM Server

We’ve introduced the following changes in PMM Server 1.2.1:

Bug fixes

[Read more]
MySQL special character rollback

Actually, Mysqlbinlog tools can’t miner mysql binlog exactly correct.

In this post ,a special environment we got may hexadecimal characters what we don’t need.

Read this PDF: Special-code-rollback.pdf

The danger of no Primary Key when replicating in RBR (and a partial protection with MariaDB 10.1)

TL;DR: unless you know what you are doing, you should always have a primary key on your tables when replicating in RBR (and maybe even all the time).

TL;DR2: MariaDB 10.1 has an interesting way to protect against missing a primary key (innodb_force_primary_key) but it could be improved.

A few weeks ago, I was called off hours because replication delay on all the slaves from a replication chain

Showing entries 4091 to 4100 of 22549
« 10 Newer Entries | 10 Older Entries »