Introduction It’s been several months now that Oracle released new Oracle Database Appliance X9-2 series. And my first project with 4 of these servers is coming to an end as moving to production is planned for the next weeks. What is the real speed of the Xeon CPUs inside these new servers? Let’s find out. Intel Xeon and CPU speed…
Introduction The Intelligent Query Processing (IQP) feature family is extended with SQL Server 2022.One of the most anticipated features is the Parameter Sensitive Plan optimization. I started to test this new feature. In this post, you will find some information to understand how it works and make your first tests too. The issue with Parameter Sensitive Plan Parameter Sensitive Plan,…
SQL Server has CPU limitations depending on the Edition. If your VM is not configured properly you can reach these limits very easily. In a previous post, I described the effect VM misconfigurations can have on performance because not all available cores are used as expected. See: SQL Server CPU limitation for Express and Standard Edition In this article I…
As a consultant at dbi services, I am lucky enough to have time dedicated to training and conferences. This week I have the chance to attend one of the most important conferences for Data professionals: SQLBits 2022. The SQLBits conference is currently taking place at ExCel London and features over 300 sessions over 5 days. Tuesday and Wednesday, the pre-conference,…
Introduction to Persistent Memory In the last few years, storage media have become more and more advanced and faster. Today, SSD disks are almost standard as storage and if an Oracle database really has an I/O critical workload, nvme storage is often used. The latest evolution in database storage is persistent memory which improves latency and I/O throughput compared to…
Introduction When it comes to performance analysis on Oracle databases, everybody think about Diagnostic Pack. This is a very complete tool and it brings much more metrics than a DBA can analyze. But there is a big drawback with this tool: it’s not included in Standard Edition and it’s an option with Enterprise Edition. If you don’t have this tool,…
This week, a customer asks me to find out how many SQL Server Standard licenses are used in their environment. The licensing is core based and to not be used for Sserver + Cals licenses. To have an idea, I create a script following the Microsoft document about the licensing here. This script is valid for the SQL Server 2016,…
Few days ago, I have very poor performance on a database that I migrate from SQL 2012 to SQL 2019. The developer Team asks me to upgrade the number of CPU and the Memory to have better performance. First, I ask the Team to give me some queries sample to test the performance between the old environment in SQL server…
I have an interested alert on SCOM for SQL Server by a customer two weeks ago. In the SCOM interface, the warning on the server is MSSQL2016: The Average Wait Time of SQL instance “xxx” on computer “xxx” is too high. After right-click on the properties, go to the tab Alert Context. On this part, you can see that the…
By Franck Pachot . Looking at database performance has always been necessary to optimize the response time or throughput, but when it comes to public cloud where you are charged by resource usage, performance tuning is critical for cost optimization. When looking at host metrics, you see only the symptoms and blindly guess at some solutions: add more vCPU if…
Introduction Oracle Database Appliances are very popular these days. And not only among new customers for this kind of engineered systems. Almost all customers already using old generation ODAs are renewing their infrastructure by choosing again ODAs, meaning that the solution is good enough and probably better than anything else. But now, public clouds are a real alternative to on-premise…
In this blog I want to introduce you to a workaround for a performance issue which randomly appeared during the upgrades of several Oracle 12c databases to 19c I performed for a financial services provider. During the upgrades we ran into a severe performance issue after the upgrades of more than 40 databases had worked just fine. While most of…
