Slow queries, inefficient queries, or long running queries are problems that regularly plague DBA's. They are always ubiquitous, yet are an inevitable part of life for anyone responsible for managing a database. 

Poor database design can affect the efficiency of the query and its performance. Lack of knowledge or improper use of function calls, stored procedures, or routines can also cause database performance degradation and can even harm the entire MySQL database cluster. 

For a master-slave replication, a very common cause of these issues are tables which lack primary or secondary indexes. This causes slave lag which can last for a very long time (in a worse case scenario).

In this two-part series blog, we'll give you a refresher course on how to tackle the maximizing of your database queries in …

The schedule of the preFOSDEM Day is now available !

We had a lot of proposals to deal with. Also this is a MySQL event where we, the MySQL Team has the possibility to show to you, our Community, all what we have working on to improve MySQL but also new stuff. We also invite some of our friends from the MySQL Community to talk about their experience.

I think we did a good selection and propose you new content. We are extremely happy to have Saverio Miroddi from TicketSolve talking about MySQL 8.0, Uber talking about InnoDB Cluster, and Facebook about Binlog.

As you can see, we will have 2 rooms, where one will be dedicated mostly to SQL and Optimizer topics but also tutorials.

You can also see that this year we also want to put some spot lights to MySQL NDB Cluster. You will see what is it, how is it used and what’s new. We will also have 2 community speakers sharing their MySQL NDB knowledge: Giuseppe Maxia, …

can we add particular columns and rows value in excel file using php

Hello, i’m one of your followers. Thank you for your tutorials.
I’m trying to build a table with bootgrid based on your example ”simple bootsgrid, add, edit”, i would resize columns at my own width but it’s don’t work. Please can you help me? How can i do it?

The innodb_io_capacity and innodb_io_capacity_max are often misunderstood InnoDB parameters. As consultants, we see, at least every month, people setting this variable based on the top IO write specifications of their storage. Is this a correct choice? Is it an optimal value for performance? What about the SSD/Flash wear leveling?

Innodb_io_capacity 101

Let’s begin with what the manual has to say about innodb_io_capacity:

“The innodb_io_capacity variable defines the number of I/O operations per second (IOPS) available to InnoDB background tasks, such as flushing pages from the buffer pool and merging data from the change buffer.“

What does this mean exactly? …

This talk uncovers which tools/plugins/settings you need to use to comply with PCI/DSS when using MySQL. Gain a solid grasp of the possibilities, as well as the limitations, MySQL offers to someone looking to become PCI/DSS certified.

Please join Percona Support Engineer Carlos Tutte on Friday, Dec 20, 2 – 3 pm EST to learn the pros and cons of PCI/DSS Certification with MySQL.

Register Now

If you can’t attend, sign up anyways we’ll send you the slides and recording afterward.

When we think about the cloud, often we consider many of the benefits: scalability, elasticity, agility, and flexible pricing.  As great as these features are, security also remains a business-critical concern. In an on-premise environment, every aspect of security is owned by you.  Looking at the database layer specifically, these include (but are not limited to):

• Data encryption
• Database access control
• Network security
• OS security (both host and guest if in VM environment)
• Physical security

When done properly, that entails a significant amount of work and generally cost.  In the cloud, those aspects are all still relevant and necessary for proper security.  However, under the shared responsibility model, some of that work is offloaded from you and shifted to the cloud provider.  Let’s look at what that model entails and how it is realized …

Hello! In MySQL 8.0.17, we made an observation in the well-known TPC-H benchmark for one particular query. The query was executing 20% faster than in MySQL 8.0.16. This improvement is because of the “antijoin” optimization which I implemented. You can find out more in my blog post on mysqlserverteam.

In MySQL 8.0.17, we made an observation in the well-known TPC-H benchmark for one particular query. The query was executing 20% faster than in MySQL 8.0.16. This improvement is because of the “antijoin” optimization which I implemented. Here is its short mention in the release notes:

“The optimizer now transforms a WHERE condition having NOT IN (subquery), NOT EXISTS (subquery), IN (subquery) IS NOT TRUE, or EXISTS (subquery) IS NOT TRUE internally into an antijoin, thus removing the subquery.”…

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Our team has continued to pave the way for Continuous MySQL Operations this year with our Continuent Tungsten products: Tungsten Clustering and Tungsten Replicator.

And we’d like to take this opportunity to thank you all – our customers, partners, followers and colleagues – for your support in 2019, and celebrate some of our successes with you…

2019 Continuent Momentum Highlights

• Launched three new Tungsten Clustering & Tungsten Replicator releases
• Introduced the new Tungsten Replicator (AMI) on the Amazon Marketplace
• Were named a 2020 Top Trending Product by Database Trends & Applications Magazine

2019 Continuent Customer Highlights

• 100%: Customer Satisfaction during the most recent customer survey
• 97.5%: our customer …