SQL Performance

FEBRUARY 17, 2022

Since SQL Server 2005, the trick of using FOR XML PATH to denormalize strings and combine them into a single (usually comma-separated) list has been very popular. In the SQL Server 2005 days, I would have offered this solution: SELECT DISTINCT UserID , Bands =. ( 1 Pink Floyd, New Order, The Hip 2 Zamfir, ABBA. FavoriteBands.

Servers 82

Servers Code Efficiency Performance 82

SQL Shack

OCTOBER 6, 2020

In this 29th article of the SQL Server Always On Availability Groups series, we configure the AG between SQL Server Linux instances. Introduction SQL Server 2017 & 2019 works on the cross-platform operating system: Windows and Linux. You […].

Servers 52

Servers Availability Operating System Systems 52

SQL Shack

AUGUST 25, 2020

In the previous article, An overview of distributed SQL Server Always On Availability Groups, we explored the concept of the distributed availability groups in SQL Server always on availability group. It is available from Windows Server 2016 and SQL Server 2017.

Availability 76

Availability Servers 76

SQL Server According to Bob

DECEMBER 18, 2018

SQL Server relies on Forced-Unit-Access (Fua) I/O subsystem capabilities to provide data durability, detailed in the following documents: SQL Server 2000 I/O Basic and SQL Server I/O Basics, Chapter 2. Be sure to deploy SQL Server 2017 CU6 or newer for best data durability and performance results. “.

Servers 90

Servers Media Cache Storage 90

SQL Performance

JANUARY 10, 2020

Earlier this week, Microsoft announced SQL Server 2019 Cumulative Update #1. To update your local Docker image: docker pull mcr.microsoft.com/mssql/server: 2019 -latest. Build a slipstreamed installer once ( Randolph West explains this process for 2017 here ), and use that for consistency across your environment.

Servers 52

Servers Testing Processing 52

Brendan Gregg

JULY 4, 2021

I summarized these topics and more as a plenary conference talk, including my own predictions (as a senior performance engineer) for the future of computing performance, with a focus on back-end servers. This was a chance to talk about other things I've been working on, such as the present and future of hardware performance.

Performance 140

Performance Latency Hardware Storage 140

Brendan Gregg

FEBRUARY 28, 2023

My personal opinion is that I don't see a widespread need for more capacity given horizontal scaling and servers that can already exceed 1 Tbyte of DRAM; bandwidth is also helpful, but I'd be concerned about the increased latency for adding a hop to more memory.

Performance 110

Performance Latency Cache Virtualization 110

SQL Performance

OCTOBER 14, 2020

I explained that when SQL Server optimizes a query involving derived tables, it applies transformation rules to the initial tree of logical operators produced by the parser, possibly shifting things around across what were originally table expression boundaries. Substitution/unnesting. Figure 4: Execution plan for Query 4.

C++ 140

C++ Servers Code Efficiency 140

The Netflix TechBlog

OCTOBER 27, 2023

When this happens, usually a k8s cloud-controller provided by the cloud vendor will detect that the actual server, in our case an EC2 Instance, has actually gone away, and will in turn delete the k8s node object. Where Do Lost Nodes Come From? Nodes can go away for any reason, especially in “the cloud”. UDP packet?

Hardware 228

Hardware Cloud Google Servers 228

SQL Server According to Bob

FEBRUARY 11, 2019

SQL Server 2017 leverages up to 4 log writer workers, on hidden schedulers, to assist in transaction log processing activities. You may find the number of log write workers has been increased to 8 when running newer releases of SQL Server to accommodate larger systems.

Servers 40

Servers Availability Software Software 40

SQL Server According to Bob

DECEMBER 11, 2017

SQL Server 2019 CTP2. SQL Server 2019 adds broad support for distributed transactions (both MSDTC/OLE-TX and XA) to SQL Server on Linux. You can establish and use transactions between Linux and Linux or Linux and Windows instances of SQL Server or your application. Configuring MSDTC for SQL Server on Linux: [link].

Servers 40

Servers Database Software Engineering Engineering 40

SQL Performance

AUGUST 27, 2019

On August 7, 2019, AMD finally unveiled their new 7nm EPYC 7002 Series of server processors, formerly code-named "Rome" at the AMD EPYC Horizon Event in San Francisco. This is the second generation EPYC server processor that uses the same Zen 2 architecture as the AMD Ryzen 3000 Series desktop processors.

Servers 52

Servers Benchmarking Virtualization Architecture 52

Brendan Gregg

NOVEMBER 28, 2017

Xen AWS 2017 In 2015, AWS launched c4, which used hardware virtualization for EBS volumes. This finally came to storage-optimized instance types in 2017 with the [i3 instance type], which used SR-IOV and the nvme storage driver. With a solution in hand for network performance, the next target was storage. ## 6. 0% performance overhead.

Virtualization 40

Virtualization AWS Hardware Storage 40

SQL Server According to Bob

MAY 19, 2019

SQL Server will ship Azure SQL Database Edge: [link]. With the announcement I can tell you more about one of the things we have been working on; SQL Server running on IoT Edge and Developer machines in under 500MB of memory. The effort focuses attention on memory usage and disk space requirements of SQL Server. Description.

IoT 61

IoT Servers Development Cache 61

SQL Server According to Bob

FEBRUARY 10, 2019

SQL Server 2017 introduced a small change to SQL Server’s default worker thread calculation, accounting for smaller environments. When running on smaller environments SQL Server reduces the worker target. On small environments SQL Server always uses 256 as the target.

Servers 40

Servers Design Systems 40

SQL Server According to Bob

APRIL 24, 2018

When I joined Microsoft in 1993, I would embark on a 25 year journey working only on Windows laptops and Windows Server computers. Last October we released SQL Server 2017 including support for Linux and Docker Containers. So here in this blog post, I will show you my journey in taking the SQL Server Mac Challenge.

Servers 40

Servers Internet Internet Open Source 40

Brendan Gregg

SEPTEMBER 5, 2017

Oracle VM Server is based on Xen. I came up with a great demo where I could break Solaris 9 and 10 servers in the same way, then demonstrate how it would take an hour and a reboot cycle to fix Solaris 9, but minutes and no reboot to fix Solaris 10. amazon"). I also wrote and published an entertaining SMF manifest that played music.

Virtualization 76

Virtualization AWS Engineering Hardware 76

SQL Performance

SEPTEMBER 17, 2019

Many database administrators find themselves having to support instances of SQL Server Reporting Services (SSRS), or at least the backend databases that are required for SSRS. These topics apply to both SQL Server Reporting Services as well as Power BI Report Server. Installation and support of SSRS can be confusing.

Tuning 67

Tuning Servers Database Best Practices 67

SQL Server According to Bob

DECEMBER 26, 2017

Bob Ward and I worked with our SQL Server Tool developers (thanks David) to enable ‘Q uick XE Trace ’ capabilities. The feature is available in the latest SQL Server Management Studio (SSMS) release. Here is an example using the SQL Server SSMS 2017 against my SQL 2016 server.

Servers 40

Servers Software Engineering Engineering Availability 40

The Symphonia

DECEMBER 6, 2017

without web app servers?—?to Serverless at re:Invent 2017 was originally published in The Symphonium on Medium, where people are continuing the conversation by highlighting and responding to this story. We continue to be fascinated to see how people will use Lambda@Edge over the coming years. Building real apps needs more than that.

Serverless 40

Serverless Lambda AWS Traffic 40

SQL Performance

AUGUST 14, 2019

SQL Server 2016 introduces the batch-mode Window Aggregate operator, which removes the performance penalty part of the pitfall, but prior to SQL Server 2019 this operator is used only if you have a columnstore index present on the data. 2017-07-04 10248 440.00 2017-07-05 10249 1863.40 2017-07-08 10250 1552.60

Best Practices 108

Best Practices Servers Database Azure 108

SQL Performance

JULY 24, 2022

SQL Server 2012 went out of all forms of official support about two weeks ago, on July 12 th. Best approaches for running totals – updated for SQL Server 2012. In the very first post on this site, I compared the performance of long-standing running totals methods with the new windowing functions added in SQL Server 2012.

Servers 66

Servers Strategy Availability Processing 66

SQL Server According to Bob

FEBRUARY 10, 2019

. · Failures occur from remote clients or sqlcmd executed directory on the server (/opt/mssql-tools/bin). SQL Server 2017 CU10 does not show behavior. · SQL Server 2017 CU12 exhibits the behavior. Server is a Superdome with lots of CPUs and RAM. Here is an example of a valid SQL Server login.

Servers 40

Servers Network Database Systems 40

SQL Performance

AUGUST 23, 2019

In traditional row-mode execution plans, SQL Server may introduce a Bitmap operator as part of performing early semi join reduction before a parallel hash or merge join. There have been major improvements since the first appearance of the batch mode execution engine in SQL Server 2012. Background. The Query Optimizer. Bitmap Choice.

Servers 75

Servers Engineering Efficiency Retail 75

SQL Performance

SEPTEMBER 12, 2019

As an example with our task, suppose that you don't realize that the grouping element is determined implicitly, and you come up with the following query: SELECT shipperid , [ 2017 ] , [ 2018 ] , [ 2019 ] FROM Sales. So you're expecting to see only three rows in the result. 830 rows affected).

Best Practices 103

Best Practices C++ Code Design 103

Brendan Gregg

FEBRUARY 28, 2023

My personal opinion is that I don't see a widespread need for more capacity given horizontal scaling and servers that can already exceed 1 Tbyte of DRAM; bandwidth is also helpful, but I'd be concerned about the increased latency for adding a hop to more memory.

Performance 52

Performance Latency Cache Virtualization 52

SQL Server According to Bob

JANUARY 12, 2018

I owe a great debt to this community to help me build a brand and reputation for my passion and talks on SQL Server. So bring your questions “all SQL Server” or the Microsoft Data Platform. I’ve had such a long, great history with the PASS Summit, Community, and all the great people that have run this organization.

Social Media 40

Social Media Servers Media Tuning 40

Brendan Gregg

JULY 4, 2021

I summarized these topics and more as a plenary conference talk, including my own predictions (as a senior performance engineer) for the future of computing performance, with a focus on back-end servers.

Performance 52

Performance Latency Hardware Storage 52

SQL Performance

JULY 16, 2019

A close monitoring of the hardware enthusiast community, including many of the most respected hardware analysts and reviewers paints an even more dire picture about Intel in the server processor space. Despite all of this, Intel is not going to lose their entire server processor business any time soon. So, what has changed my mind?

Servers 46

Servers Hardware Architecture Retail 46

SQL Performance

JULY 8, 2020

I should stress that in practice, there’s no actual process in which SQL Server converts the original query string with the nested logic to a new query string without the nesting. As mentioned, SQL Server will attempt to unnest table expressions, but will avoid the unnesting if it stumbles into an unnesting inhibitor.

Servers 110

Servers Code Processing Performance 110

SQL Server According to Bob

FEBRUARY 22, 2018

Prior to SQL Server 2017 CU4 for Linux (Linux only) the generation of a sequential UUID may not function as expected. SQL Server’s NewSequentialId () calls the Windows API UuidCreateSequential , which is limited in SQLPAL, prior to the CU 4 update. Server B may be generating uuids that sort before those from Server A.

Servers 40

Servers Software Engineering Database Network 40

SQL Performance

JULY 9, 2019

I posted a suggestion to improve SQL Server by adding support for nested window functions. 2 2017-09-18 88.80 Hopefully, this article will increase awareness of the true nested window functions feature, and cause people to turn to Microsoft and ask to add support for it in SQL Server. 10248 85 2017-07-04 440.00

Servers 83

Servers Availability Database Code 83

SQL Performance

OCTOBER 14, 2020

I explained that when SQL Server optimizes a query involving derived tables, it applies transformation rules to the initial tree of logical operators produced by the parser, possibly shifting things around across what were originally table expression boundaries. Substitution/unnesting. Figure 4: Execution plan for Query 4.

C++ 52

C++ Servers Code Efficiency 52

Percona

JUNE 4, 2023

This blog post was originally published in November 2017 and was updated in June 2023. In this blog, we’ll provide a comparison between MariaDB vs. MySQL (including Percona Server for MySQL ). MariaDB Server, on the other hand, is a fork of MySQL 5.5.

Open Source 52

Open Source Servers Storage Scalability 52

SQL Performance

OCTOBER 9, 2019

The EOMONTH function was introduced in SQL Server 2012. Many people are not aware that SQL Server 2017 introduced a new function called TRANSLATE that simplifies such replacements a great deal. SQL Server 2017 introduced support for the function TRIM. SQL Server 2012 introduced the function CONCAT.

C++ 111

C++ Database Servers Code 111

SQL Server According to Bob

JANUARY 28, 2018

Note: SQL Server can be a client using a linked server, allowing SQL Server to become an APP and/or an RM ). The application then uses the SQL Server client (SQL Server ODBC for this example) to establish a TDS based connection to the target SQL Server (local or remote.). Local Host Name. The olehlp!

Servers 40

Servers Azure Engineering Java 40

Dynatrace

JUNE 15, 2023

If your application runs on servers you manage, either on-premises or on a private cloud, you’re responsible for securing the application as well as the operating system, network infrastructure, and physical hardware. The financial services sector alone saw a surge in web application and API attacks of 257% from 2021 to 2022.

Cloud 173

Cloud Open Source Architecture Monitoring 173