Press "Enter" to skip to content

Author: Kevin Feasel

A Critique of Parameter Sensitive Plan Optimization

Published 2022-08-26 by Kevin Feasel

Brent Ozar is not amused:

Parameter sniffing is a notorious problem for Microsoft SQL Server because it tries to reuse execution plans, which doesn’t work out well for widely varying parameters. Here’s a primer for the basics about how it happens.

SQL Server 2022 introduces a new feature called Parameter Sensitive Plan optimization. I’m not really sure why Microsoft capitalized the first three letters sometimes and not others, or why they only abbreviate it as “PSP optimization” – as long as we’re abbreviating, why not call it PSPO? Optimization is the word in there with the most syllables – why the hell would we leave that one as the one that isn’t abbreviated?

Because I make things go faster for a living, we’re gonna call it PSPO. You’ll see how I pronounce it later, and why.

Erik Darling has also spent a lot of time talking about this. And at this point, I don’t know that how many (if any) of Brent’s critiques get fixed before RTM.

Comments closed

Wrapping Get-Credential in Powershell

Published 2022-08-26 by Kevin Feasel

Stuart Ainsworth writes a script:

Just a quick blog; am working on a script that requires credentials to run against a REST API, and a developer wanted to convert that script to use command-line parameters. I built this script (and quick test) to show that the command-line parameters create the same object as the Get-Credential object.

The one thing that has me on edge a little is that the password comes in as plaintext. I do understand that sometimes this is the best route, though I’d put the pressure on devs to make sure there isn’t a route in which plaintext passwords get encrypted before transmission, even in a local environment like this.

Comments closed

Max Server Memory and AWS

Published 2022-08-26 by Kevin Feasel

Andrea Allred runs into a weird issue on AWS RDS:

We tracked down every job that was touching the server and started to tune it, thinking that was just pushing us over the edge. We worked with AWS and finally one of our engineers noticed that our MAX Server Memory Setting was back at the SQL default. You know that insane default? Yes, it was there. But we had properly set that…three months ago when this stack was put in place.

Click through for the entire story, including symptoms and resolution.

Comments closed

DAX Studio 3 Released

Published 2022-08-26 by Kevin Feasel

Marco Russo has an announcement:

DAX Studio 3 was released today.

This new, major version offers a new user interface and user experience, providing a modern look and feel without losing any of the features available in previous versions. On the contrary, in DAX Studio 3, many features that were harder to reach in the past are now more visible and easier to use.

The cost of implementing a complete overhaul for a product’s user interface is typically high, but at the same time, this overhaul does not provide new features compared to previous versions. So why bother about the user interface while the product is free and open-source?

Read on to see what those changes look like.

Comments closed

Trying out Shiny Python

Published 2022-08-25 by Kevin Feasel

Jamie Owen kicks the tires on Py-shiny:

We would posit (see what we did there) that R-{shiny} has been a boon for data science practitioners using the R language over the last decade. We know that in our Python work, we have certainly been clamouring for something of the same ilk. And whilst there are other frameworks that we also like, streamlit and dash to name a couple, neither of them has filled us with the same excitement and confidence that shiny did in R to build both simple and complex bespoke web applications. With RStudio Posit conf in action the big news from July 27th was the alpha release of Py-{shiny} which was a source of great interest for us, so we couldn’t resist installing and starting to build.

If you are familiar with R-shiny already, then much of the py-shiny package will feel familiar to you (albeit with a couple of things having been renamed). However we will approach the rest of this post assuming that a reader does not have that prior experience and take you through building a simple shiny application to display plots on subsets of a dataset.

I’m curious how much take-up there will be for the library, given that there are several good competitors on Python.

Comments closed

NOLOCK and Inserts

Published 2022-08-25 by Kevin Feasel

William Assaf shows us the bad idea of the day:

Error 1065 states “The NOLOCK and READUNCOMMITTED lock hints are not allowed for target tables of INSERT, UPDATE, DELETE or MERGE statements.”  However, NOLOCK can still dangerously be used as the source of the write. (NOLOCK can also fail with error 601 on even basic SELECT statements, but coders just aren’t always scared off by that.)

Here’s a very elementary example to share at parties in order to scare developers away from using NOLOCKs adventurously:

Read on for an example which shows the level of pain you can find yourself in with NOLOCK.

Comments closed

Installing SQL Server on CentOS

Published 2022-08-25 by Kevin Feasel

Nisarg Upadhyay has a walkthrough for us:

In this article, we will understand how we can manage a SQL Database in CentOS 8.0. This article is the first article on the topic Manage SQL Server on CentOS.

1. Step-by-step Installation of SQL Server and client tools in CentOS

2. Create and connect to the SQL Database

I have created a virtual machine on a workstation and installed CentOS 8.0. First, let us install SQL Server on CentOS.

One quick note is that CentOS is no longer officially supported as a platform for SQL Server on Linux. It’ll still work fine, though if you use it in production and run into a problem, there’s a risk that you wouldn’t be able to get timely support. Still, if you’re just trying it out on a personal device and you like the Red Hat-like experience versus Ubuntu-based distributions, getting Microsoft support isn’t all that relevant.

Comments closed

Overview of Arc-Enabled SQL Managed Instances

Published 2022-08-25 by Kevin Feasel

Warwick Rudd continues an overview of Azure Arc-Enabled Data Services:

In our previous post, we mentioned the 2 types of data services that are supported and able to be managed by our newly deployed Data Controller:

– Azure Arc-enabled SQL Managed Instance

– Azure Arc-enabled PostgreSQL Hyperscale

In this pose we are going to have a look at the differences between an installation of Azure SQL Managed Instance and Azure Arc-enabled SQL Managed Instance.

This post doesn’t cover the actual deployment; Warwick promises that in his next post.

Comments closed

Azure Data Studio August 2022 Updates

Published 2022-08-25 by Kevin Feasel

Timi Oshin has another month’s worth of updates for us:

The SQL Database Projects Publish dialog has been enhanced with a breadth of options including excluding object types, data definition language (DDL) trigger behavior, index rebuild behavior, and more. These options are available after clicking the Advanced button and a description for each option appears at the bottom of the panel. With the availability of these options, you can now publish a SQL project or generate the publish script with more precision for the requirements unique to your environment.

This is something I’ve missed from VSCode / Azure Data Studio that I could do 15 years ago in Visual Studio.

Comments closed

Undocumented Goodies in SQL Server 2022 RC0

Published 2022-08-25 by Kevin Feasel

Brent Ozar digs through some internals:

Microsoft has an official list of what’s new in 2022 overall, but here I’m specifically focusing on system objects that might be interesting to script developers like you and I, dear reader.

New stored procedure sp_get_table_card_est_and_avg_col_len – I assume the “card” refers to statistics and cardinality, not Hallmark. SQL Server has historically struggled with memory grants because it uses datatype size to budget memory grants, and bigger-than-necessary data types (like NVARCHAR(MAX)) have led to larger-than-necessary grants. It’d be cool if this proc was a down payment to mitigate that problem, but I have a sinking feeling it has to do with external data sources. I would tell you more about it, but when I run it, I get:

Read on for the full list.

Comments closed