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Displaying posts with tag: MySQL (reset)
Can We Set up a Replicate Filter Within the Percona XtraDB Cluster?

If you were to ask me the question, “Would it be possible to set up a replicate filter within the Percona XtraDB Cluster?” my immediate response would be to question you right back. Why would you even want the cluster nodes to have different data when you’re using a synchronous replication cluster? That’s because, instinctively, […]

Observing InnoDB Cluster: A different approach for specific info extraction

Now this is far from being any observability manual for your InnoDB Cluster and let alone go into everything MySQL Shell API Admin, or the collectDiagnostics utility. You can also use the default javascript commands that we all know and love via dba.getCluster() and so on, but here’s a different take.

I just want to share something I’ve been playing with to pull out some key info from mycluster. Hope it helps someone else out there.

General setup:

select cluster_id, cluster_name, description, cluster_type, primary_mode, clusterset_id
from mysql_innodb_cluster_metadata.clusters;

Members of our cluster:

select * from …
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Seamless Table Modifications: Leveraging pt-online-schema-change for Online Alterations

Table modifications are a routine task for database administrators. The blog post Using Percona Toolkit to Alter Database Tables Online: A Controlled Approach provides insights into the process of altering tables online in a controlled manner, ensuring uninterrupted access for application users and preventing application downtime. We will focus here on utilizing the powerful “pt-online-schema-change” […]

Securing Your MySQL Database: Essential Best Practices

Have you ever read a news story about a major company experiencing a data breach that exposed millions of customer records? These breaches can be devastating, causing significant financial losses, reputational damage, and even legal repercussions. Unfortunately, MySQL databases, one of the most popular relational database management systems, is at the heart of many critical […]

MySQL 8.4 First Peek

MySQL 8.4 has now been officially released, and this is a quick review of what is in the release notes. This is momentous as it is designated a Long-Term Support (LTS) release. Various 8.0 releases introduced material changes that impacted speed and stability, causing hair-pulling and swearing among those affected. Please note this is a […]

MySQL 8.4 LTS – new production-ready defaults for InnoDB

Yesterday, MySQL 8.4, the very first LTS version of MySQL was released.

A lot of deprecations have finally been removed, and several InnoDB variable default values have been modified to match current workloads and hardware specifications.

The default value of 20 InnoDB variables has been modified!

Let’s have a look at those variables and explain the reason for such modification:


Previous Value: ON
New Value (8.4 LTS): OFF if MADV_DONTDUMP is supported
else ON

MADV_DONTDUMP is a macro supported in Linux 3.4 and later, (“sys/mman.h” header file is present and contains the symbol MADV_DONTDUMP, a …

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Consistent Lookup Vindex: Achieving Data Consistency without 2PC

Vindex # Vitess uses Vindexes (short for Vitess Index) to associate rows in a table with a designated address known as Keyspace ID. This allows Vitess to direct a row to its intended destination, typically a shard within the cluster. Vindexes play a dual role: enabling data sharding through Primary Vindexes and facilitating global indexing via Secondary Vindexes. Through this mechanism, Vindexes serve as an indispensable tool for routing queries in a sharded database, ensuring optimal performance and scalability.

Did MyDumper LIKE Triggers?

Yes, but now it likes them more, and here is why. Intro Using the LIKE clause to filter triggers or views from a specific table is common. However, it can play a trick on you, especially if you don’t get to see the output (i.e., in a non-interactive session). Let’s take a look at a […]

How to Add, Show, and Drop MySQL Foreign Keys

A key is typically defined as a column or a group of columns that are used to uniquely locate table records in relational databases (including MySQL, of course). And now that we've covered MySQL primary keys on our blog, it's time to give you a similarly handy guide on foreign keys.

The post How to Add, Show, and Drop MySQL Foreign Keys appeared first on Devart Blog.

When COMMIT Is the Slowest Query

When COMMIT is the slowest query, it means your storage is slow. Let’s look at an example.

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