Windowing functions are a critical tool for grouping rows of data that are related to other rows. But they go far beyond the regular aggregate functions found in MySQL 5.7 and earlier. In MySQL 8 you do not have to collapse all the information down into a single output row. Each row can retain its individual identity but the server can analyze the data as a unit.
Statistics and Damned Lies Finding the total Population of the District Texas from the world.city table is simple.
SQL> select District, sum(Population)
from city where district = 'Texas';
| District | sum(Population) |
| Texas | 9208281 |
1 row in set (0.0068 sec)
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“Spark and Ignite can complement each other very well. Ignite can provide shared storage for Spark so state can be passed from one Spark application or job to another. Ignite can also be used to provide distributed SQL with indexing that accelerates Spark SQL by up to 1,000x.”–Nikita Ivanov.
I have interviewed Nikita Ivanov,CTO of GridGain.
Main topics of the interview are Apache Ignite, Apache Spark and MySQL, and how well they perform on big data analytics.
Q1. What are the main technical challenges of SaaS development projects?
Nikita Ivanov: SaaS requires that the applications be highly responsive, reliable and web-scale. SaaS development projects face many of the same challenges as …[Read more]
In this post, we’ll look at MySQL CDC, streaming binary logs and asynchronous triggers.
What is Change Data Capture and why do we need it?
Change Data Capture (CDC) tracks data changes (usually close to realtime). In MySQL, the easiest and probably most efficient way to track data changes is to use binary logs. However, other approaches exist. For example:
- General log or Audit Log Plugin (which logs all queries, not just the changes)
- MySQL triggers (not recommended, as it can slow down the application — more below)
One of the first implementations of CDC for …[Read more]
Get a preview of the next advance in data management technology! Continuent Tungsten 3.0 brings the power of advanced clustering and replication to offer data management needs for your entire business including MySQL high availability, disaster recovery, multi-master operation, and real-time data warehouse loading. With Continuent Tungsten you can apply the full power not just of MySQL but all
You probably ask yourself sometimes how you can boost MySQL indexes when you are working with BIG databases/tables.
Really the solution is here for a long time already. You can use SSD disks (also known as flash disks). These disks are not that big that traditional SATA hard drives but they provide a superior performance. If your database is rather big to be placed on SSD disk you can still
It is the day after the conference ended and I feel great. Two days of percona live and a day of skysql, drizzle and sphynx presentations were just awesome. I can say that IMHO it is one of the best MySQL conferences since I started attending four years ago. Well done Percona.
There were some great tracks by very very smart people and I have started compiling my list of things to build/setup to make my own deployment better, faster and easier to manage. Full track list can be found: http://www.percona.com/live/mysql-conference-2012/
I should also thank SkySQL and MariaDB for the free days of sessions I attended yesterday, organized and delivered by these two community focussed companies.
Introducing MySQL Workbench Utilities
One of the many new things that is being introduced during the Collaborate 2011 and 2011 MySQL Users’ Conference are some great new additions to some of the external tools for managing MySQL servers. One of those tools receiving updates is the MySQL Workbench.
One of the jewels in a long list of new features is the addition of new command-line utilities to help you administer your servers. The new feature is called MySQL Workbench Utilities. It is a package of easy-to-use utilities for maintenance and administration of MySQL servers. These utilities incapsulate a set of primitive commands bundling them so that you can perform macro operations with a single command. Some of the key features in MySQL Workbench Utilities include:
- Plugin for MySQL Workbench 5.2.31
- Available under the GPLv2 license
- Written in Python …
Lets paint the picture:
Scenario part 1 : Migrating a couple thousand stored procedures
from database technology X to mysql
Scenario part 2 : Legacy system where the people who wrote it left a long time ago
Scenario part 3 : Developers sure can get real creative and invent all kinds of ways to get data (eg: having a stored proc which formulates a big query using concat after going through a bunch of conditions (fair enough), BUT the parts making up the different queries are stored in a table on a database rather than within the stored proc itself) … talk about KIS – Keep it simple!!
Scenario part 4 : This stored proc references 18 tables, 4 views, and another two stored procedures on 5 databases
Now close your eyes and try to imagine that for a few seconds, nah kidding don’t want you to hurt yourself.
I wonder, who’s gonna cover my health insurance if i go crazy? :)
mysql 02:55:47 DEV …[Read more]
Fig 1. Typical management configuration
MySQL Cluster is designed to be a High Availability, Fault Tolerant database where no single failure results in any loss of service.
This is however dependent on how the user chooses to architect the configuration – in terms of which nodes are placed on which physical hosts, and which physical resources each physical host is dependent on (for example if the two blades containing the data nodes making up a particular node group are cooled by the same fan then the failure of that fan could result in the loss of the whole database).
Of course, there’s always the possibility of an entire data center being lost due to earthquake, sabotage etc. and so for a fully available system, you should consider using asynchronous replication to a geographically remote Cluster.
Fig 1. …[Read more]
Reading this article you will learn how to create a Customized Performance Report for one of your MySQL™ Servers using HoneyMonitor, a GUI for MySQL™ Server Administration, Monitoring & Performance Tuning.
- Step 1 - Choosing a File Name and Opening the Report Designer
- Step 2 - Editing the SQL Queries used by the Report
- Step 3 - Editing the Charts contained in the Report
- Axis Name
- Step 4 - Other minor changes
- Step 5 - Previewing our Customized Report
- Few Considerations and Useful Tips
- Actual Date Interval …
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