ProxySQL is an open-source MySQL proxy server, meaning it serves as an intermediary between a MySQL server and the applications that access its databases. ProxySQL can improve performance by distributing traffic among a pool of multiple database servers.

Consider 2 slaves are routed under Proxysql , In any one of the slave, if the replication is broken, we could still see the traffic routing to the broken replication slave. We can make Proxy to not send traffic to broken replication slave, by setting appropriate value to the variable mysql-monitor_slave_lag_when_null

…

A couple of days ago I was creating an index on the source and when I checked the replica side it was not replicated, so I just wanted to explain how the replication filter may increase the complexity of your DBA operations.

Replication occurs by reading events from the binary log of the source and then executing them on the replica. The events in the binary log are recorded in different formats, depending on the type of event. These formats are determined by the binary logging format used when the events were initially recorded on the source. The relationship between the binary logging formats and the terminology used during replication is as follows:

When using statement-based binary logging, the source writes SQL statements to the binary log. Replication of the source to the replica is performed by executing these SQL statements on the replica. This is known as statement-based replication (SBR), and it …

What is a Delay Replica and how does it help?

MySQL Replication is useful, easy to set up, and used for very different purposes. For example:

• split reads and writes
• run data mining or reporting processes on them
• disaster recovery

To learn more, check out How Does MySQL Replication Work?

It’s important to mention that a replication server is not a backup by itself. A mistake on the source, for example, a DROP DATABASE or an UPDATE without a WHERE clause will be replicated nearly instantly to all replica servers. Simply having a replica is not going to be helpful here. How can we avoid that kind of mistake? By having a replica server that intentionally lags behind.

We can never avoid human error in database infrastructure operations. But …

The Primary key is like the hero of a row, which has more beneficial features in the table while performing any task on the table.

The DBA knows the importance of the primary key in the table and how to handle it.

1. Notable features of having a primary key:
2. Requirements:
3. Enabling GIPK:
4. Handling GIPK:
…

Vitess is a solution that allows you to infinitely scale MySQL while providing clients and apps with a single logical view of the fleet of MySQL instances comprising any number of Keyspaces and Shards. Vitess also provides the cluster and data management tools that make it possible to manage a massive cluster and perform complex workflows using VReplication, such as: Moving tables into Vitess or between keyspaces Resharding to adjust to changes in data size and load Materialized views and rollups for data analytics and data locality Online schema changes that are trackable, cancellable, revertible, and retryable Why a Diff Tool?

In this blog, I will cover important aspects which you need to test when benchmarking replication setup. MySQL has great tools that could be used to test its performance. They include:

sysbench – https://github.com/akopytov/sysbench

BMK-kit – http://dimitrik.free.fr/blog/posts/mysql-perf-bmk-kit.html

mysqlslap – https://dev.mysql.com/doc/refman/8.0/en/mysqlslap.html

LinkBench – https://github.com/facebookarchive/linkbench

I will not describe how to use them here, as you can find instructions on the provided links or in the Percona blog by browsing tags …

Today, the book I would like to recommend is Efficient MySQL Performance – Best Practices and Techniques, Daniel Nichter, O’Reilly, 2021.

I participated (just a bit) in the writing of this book as technical reviewer with Vadim and Fipar. I really enjoyed that role of carefully reading the early drafts of the chapters Daniel was writing.

Although Daniel says the book is not for the experts, I think even experts will enjoy it because several key InnoDB concepts are also covered. You can see that I refer to the book often in my A graph a day, keeps the doctor away ! series on monitoring and trending.

If you’re looking for information on transaction isolation and undo logs, fuzzy checkpointing, etc… you’ll find …

I am currently working on a script to auto-enable parallel replication / multi-threaded replication (MTR) when there is replication lag.  For testing this script, I need to trigger replication lag that would disappear after enabling MTR.  I came-up with a simple solution for that, and I thought it could be useful to more people, so I am writing this blog post about it.  Read-on for the details.

Last month I performed a review of the Percona Operator for MySQL Server which is still Alpha.  That operator is based on Percona Server for MySQL and uses standard asynchronous replication, with the option to activate semi-synchronous replication to gain higher levels of data consistency between nodes. 

The whole solution is composed as:

Additionally, Orchestrator (https://github.com/openark/orchestrator) is used to manage the topology and the settings to enable on the replica nodes, the semi-synchronous flag if required. While we have not too much to say when using standard Asynchronous replication, I want to write a few words on the needs …

Amazon Web Services (AWS) very recently(March 02, 2022) announced the GA of its new RDS feature “Readable standby with Multi-AZ deployments” for MySQL. Yes !! you heard it right you can now use the standby instances created with Multi-AZ deployments for failover as well as for Read-scaling starting with version 8.0.26 and later for MySQL in RDS

Launching a MultiAZ Cluster

Now let us see how to launch this readable-Multi AZ cluster?

Region Availability: As this is a new feature now it is currently limited to the regions US-EAST-1 (N.Virginia), US-WEST-1 (Oregon), and EU-WEST-1 (Ireland), this list would be extended progressively

VPC requirement:

Before launching the instance, you should have SUBNET created for 3 AZ(Availability Zone) within the VPC since the cluster instances would be spawn across 3AZ by default

Hereunder the “Engine Option” …