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Day: August 12, 2022

Custom Infix Functions in R

Published 2022-08-12 by Kevin Feasel

Dominik Rafacz loves infix functions:

Custom infix functions are one of my favorite features in R. This article is my love letter to them. But first, a quick recap.

For those unfamiliar with the terminology, infix function is a function fun which is called using infix notation, e.g., x fun y instead of fun(x, y). Those functions are also called infix operators by base R, and I will use those terms and name infixes interchangeably. There are a lot of infix operators in base R used very frequently, i.e., arithmetic or logical operators. We use them so often that we usually forget that they are functions. And that we can call them just like regular functions.

Infix functions are something I tend to forget entirely about developing on my own but they can be extremely useful, as Dominik shows. H/T R-Bloggers.

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An Intro to Key Word Analysis

Published 2022-08-12 by Kevin Feasel

Lewis Prince continues a series on natural language processing:

Here we are with part 2 of this blog series on web scraping and natural language processing (NLP). In the first part I discussed what web scraping was, why it’s done and how it can be done. In this part I will give you details on what NLP is at a high level, and then go into detail of an application of NLP called key word analysis (KWA).

Read on for a high-level overview of the topic and how to do it in Cognitive Services. But not the topic model—that’d be a different post.

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Purview Access Policies and SQL Server 2022

Published 2022-08-12 by Kevin Feasel

Srdan Bozovic links Purview and SQL Server 2022:

The focus of this article is on using Microsoft Purview to enable access to user data as well as specific system metadata in SQL Server 2022 running on Azure Arc–enabled servers.

With the SQL Server 2022 release, the goal is to enable three main scenarios:

– Browsing data in user-defined tables and views.

– Performance monitoring with system commands, functions, and views.

– Security auditing with security-related system functions and views.

If Azure Arc-enabled servers are required for Purview to work, I think that will seriously hinder uptake.

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Resolving tempdb Issues in Azure SQL DB

Published 2022-08-12 by Kevin Feasel

Holger Linke troubleshoots some problems:

The tempdb system database is a global resource available to users who are connected to Azure SQL Database or any instance of SQL Server. It holds temporary user objects that are explicitly created by a user or application, and internal objects that are created by the SQL Server database engine itself. The most common tempdb issue is running out of space, either regarding tempdb’s overall size quota or the transaction log.

The available tempdb space in Azure SQL Database depends on two factors: the service tier (pricing tier) that the database is configured with, and the type of workload that is executed against the database. These are also the main factors to control if you are running out of tempdb space.

Click through for several error cases and how we can resolve them.

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When Estimated and Actual Plans Differ

Published 2022-08-12 by Kevin Feasel

Brent Ozar notes that estimated plans are not guarantees:

A reader posted a question for Office Hours:

Hi Brent, What is your take on Hugo Kornelis’s explanation of execution plan naming. As her his explanation, estimated exec plan is simply an execution plan whereas actual execution plan = execution plan+run-time stats. Do you agree that the naming is flawed and confusing? – Yourbiggestfan

Click through to see examples of when estimated plans might look different from actual plans.

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