The latest from the MySQL community

In this blog post, we’ll look at how sequence numbers work in Percona XtraDB Cluster.

Introduction

Percona XtraDB Cluster uses multiple sequence numbers (seqno), each having a special role to play. Let’s try to understand the significance of each sequence number.

global_seqno

An active Percona XtraDB Cluster cluster has multiple write-sets (transactions) generated from one or more nodes. These transactions then get replicated to other nodes of the cluster. Each write-set/transaction should have a unique identity across the cluster. global_seqno helps serve this identity. Given write-set will have the same global_seqno on …

I’ve recently been trying to improve the performance of the Vertica replicator, particularly in the form of the of the new single schema replication. We’ve done a lot in the new Tungsten Replicator 5.3.0 release to improve (and ultimately support) the new single schema model.

As part of that, I’ve also been personally looking to Kodiak MemCloud as a deployment platform. The people at Kodiak have been really helpful (disclaimer: I’ve worked with some of them in the past). MemCloud is a high-performance cloud platform that is based on hardware with high speed (and volume) RAM, SSD and fast Ethernet connections. This means that even without any adjustment and tuning you’ve got a fast platform to work on.

However, if you are willing to put in some extra time, you can tune things further. Once you have a super quick …

I’ve recently been trying to improve the performance of the Vertica replicator, particularly in the form of the of the new single schema replication. We’ve done a lot in the new Tungsten Replicator 5.3.0 release to improve (and ultimately support) the new single schema model.

As part of that, I’ve also been personally looking to Kodiak MemCloud as a deployment platform. The people at Kodiak have been really helpful (disclaimer: I’ve worked with some of them in the past). MemCloud is a high-performance cloud platform that is based on hardware with high speed (and volume) RAM, SSD and fast Ethernet connections. This means that even without any adjustment and tuning you’ve got a fast platform to work on.

However, if you are willing to put in some extra time, you can tune things further. Once you have a super quick …

Important notice: With this release, we have changed the registration keys. As usual, the new keys are available for registered users from our Customer Portal.

Monyog MySQL Monitor v8.4.0 adds more alert and logging options and enhances the MONyog API. Further, we redesigned the settings page and a number of bugs were fixed.

Changes as compared to Monyog MySQL Monitor v8.3.2 include: Features:

Added more notification channels (Slack and Pagerduty) for Monyog alerts. (Read more) Option to write Monyog alerts in the Syslog of the machine where Monyog is installed. This option is only available for Linux. Option to edit the subject line for Monyog alerts. Added MONyog API to disable notification for a monitor based on a server/tag. ( …

is this workable to dump in master node and load in slave node to warm up slave ?
I use xtrabackup to build slave , but concerns the page_id is not exactly the same .

• Fosdem: Check
• MySQL DEVroom: Check
• Food: …

If you were worrying there , even for just a bit, please don’t ;) We are working on organizing the 2018 Edition of the  MySQL Community dinner!

We can already disclose that it will be held at ICAB again, the same location that was used previously and are targeting Friday February 2, following the Oracle Pre-Fosdem MySQL Day,  so come one, come all… but most of all, come hungry!!

Stay tuned, more updates will follow soon!

This year was even more hard than previous years are we received 76 amazing submission ! 76 !!

The Committee had the difficult task to choose only 15 of them.

This is the list of the talks that were accepted:

Get your Percona Live Open Source Database Conference 2018 Super Saver tickets now.

The countdown is on for the annual Percona Live Open Source Database Conference 2018! The conference takes place in Santa Clara, CA from April 23-25, 2018. The theme is Championing Open Source Databases, and the three-day conference will focus on the latest trends, news and best practices in MySQL, MongoDB, PostgreSQL and other open source databases. It includes tracks on time series data, cloud databases, operations, business/case studies and more.

This year’s conference will feature one day of tutorials and …

With MySQL version 5.7.11 and up, Oracle continues to improve MySQL’s security features by adding MySQL Enterprise Transparent Data Encryption (TDE) for InnoDB tables stored in innodb_file_per_table tablespaces. This feature provides at-rest encryption for physical tablespace data files.

MySQL Enterprise TDE uses a two-tier encryption key architecture, consisting of a master encryption key and tablespace keys. When an InnoDB table is encrypted, a tablespace key is encrypted with the master key and the encrypted value of the tablespace key is stored in the tablespace header. When encrypting tablespace data, InnoDB transparently uses the master encryption key …

Working in an operations environment means that you get a lot of questions.  There’s the inevitable troubleshooting tasks that go along with being a DBA.  This is designed to be a quick reference post, much like my more in depth post in 2016 about timeouts. These typical error messages can create confusion and unneeded activities to diagnose.  To aid my own process of elimination and those of others, here are three error messages every DBA should know by heart.

SQLSTATE[HY000] [2002] Connection timed out

Plain and simple: this error means the client cannot connect to the server.

• The calling program is trying to connect to the wrong database server (one that it cannot reach).
• The database server is completely down (you’d get another error if the server and client actually made a connection). …