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Updating/Deleting Rows From Clickhouse (Part 2)

In this post, we’ll look at updating and deleting rows with ClickHouse. It’s the second of two parts.

In the first part of this post, we described the high-level overview of implementing incremental refresh on a ClickHouse table as an alternative support for UPDATE/DELETE. In this part, we will show you the actual steps and sample code.

Prepare Changelog Table

First, we create the changelog table below. This can be stored on any other MySQL instance separate from the source of our analytics table. When we run the change capture script, it will record the data on this table that we can consume later with the incremental refresh script:

CREATE TABLE `clickhouse_changelog` (
  `db` varchar(255) NOT NULL …
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Fun with Bugs #60 - On Some Memory Leaks, Replication and Other Bugs Fixed in MySQL 5.7.21

Oracle had formally released MySQL 5.7.21 yesterday. I do not bother any more to study MySQL release notes carefully and completely, but during a quick review today I've noted several interesting items I'd like you to pay attention to.

I am historically interested in InnoDB implementation details, so I could not miss Bug #87619 - "InnoDB partition table will lock into the near record as a condition in the use ". This was a regression bug in 5.7+, probably caused by new implementation of partitioning in InnoDB.

Another interesting bug is Bug #86927 - "Renaming a partitioned table does not update mysql.innodb_table_stats.", by …

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Webinar January 18, 2018: MySQL Troubleshooting and Performance Optimization with Percona Monitoring and Management (PMM) Part 2

Join Percona’s Product Manager Michael Coburn as he presents MySQL Troubleshooting and Performance Optimization with Percona Monitoring and Management (PMM) Part 2 on Thursday, January 18, 2018, at 11:00 am PST / 2:00 pm EST (UTC-8).

Register Now

Tags: Percona Monitoring and Management, PMM, Monitoring, MySQL, Performance, Optimization, DBA, SysAdmin, DevOps
Experience Level: Expert

Optimizing MySQL performance and troubleshooting MySQL problems are two of the most critical and challenging tasks for …

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MySQL Workbench on Slack

Now that we have the new MySQL community workspace on Slack we opened a workspace channel for our users there. If you have a question or problems with Workbench this is the place to be.

This channel will soon replace our old #workbench IRC channel.

MySQL on Docker - How to Containerize Your Database - New Whitepaper

Severalnines is happy to announce that our new whitepaper “MySQL on Docker - How to Containerize Your Database” is now available to download for free!

While the idea of containers has been around since the early days of Unix, Docker made waves in 2013 when it hit the market with its innovative solution. Docker allows you to add your stacks and applications to containers where they share a common operating system kernel. This lets you have a lightweight virtualized system with almost zero overhead. Docker also lets you bring containers up or down in seconds, making for …

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List of Conferences & Events w/ MySQL, January - March 2018!

As a tradition (and follow up of the previous announcement posted on Oct 23, & Sep 15, 2017) we would like to inform you about a conferences & events we - MySQL Community Team - are attending together with MySQL experts in the first quarter of 2018. Please be aware that the list does not have to be final, during the time more events could be added or some of them removed.  

January 2018:  

  • OpenSource Conference (OSC) Osaka, Japan, January 26-27, 2018

    • We are happy to announce MySQL attendance and MySQL session at the OSC event in Osaka, Japan. Please do not miss …
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ProxySQL Firewalling

In this blog post, we’ll look at ProxySQL firewalling (how to use ProxySQL as a firewall).

Not long ago we had an internal discussion about security, and how to enforce a stricter set of rules to prevent malicious acts and block other undesired queries. ProxySQL came up as a possible tool that could help us in achieving what we were looking for. Last year I wrote about how to use ProxySQL to stop a single query.

That approach may be good for few queries and as a temporary solution. But what can we do when we really want to use ProxySQL as an SQL-based firewall? And more importantly, how to do it right?

First of all, let us define what “right” can be in this context. …

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Backup and data streaming with xbstream, tar, socat, and netcat

On April 4th 2012 Xtrabackup 2.0 was released in to GA by Percona along with a new streaming feature called xbstream. This new tool allowed for compression and parallelism of streaming backups when running xtrabackup or innobackupex without having to stream using tar, then pipe to gzip or pigz, then pipe to netcat or socat to stream your backup to the recipient server. This resulted in …

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Announcing MySQL Server 5.7.21, 5.6.39, and 5.5.59

MySQL Server 5.7.21, 5.6.39, and 5.5.59, new versions of the popular Open Source Database Management System, have been released. These releases are recommended for use on production systems. For an overview of what’s new, please see http://dev.mysql.com/doc/refman/5.7/en/mysql-nutshell.html http://dev.mysql.com/doc/refman/5.6/en/mysql-nutshell.html http://dev.mysql.com/doc/refman/5.5/en/mysql-nutshell.html For information on installing the release on new servers, please see the MySQL installation documentation at […]

Sneak Peek of the Percona Live 2018 Open Source Database Conference Breakout Sessions!

Take a look at the sneak peek of the breakout sessions for the Percona Live 2018 Open Source Database Conference, taking place April 23-25, 2018 at the Santa Clara Convention Center in Santa Clara, California. Early Bird registration discounts are available until February 4, 2018, and sponsorship opportunities are still available.

Conference breakout sessions will feature a range of in-depth talks related to each of the key areas. Breakout session examples include:

  • Database Security as a Function: Scaling to Your Organization’s Needs – Laine Campbell, …
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