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Author: Kevin Feasel

New Features in Azure Synapse Analytics

Published 2019-11-14 by Kevin Feasel

James Serra gives us a bullet list of new features in Azure Synapse Analytics:

Almost lost in all the announcements from Ignite was a bunch of amazing new features that were added to the Provisioned Resources/SQL Pool section (read SQLDW functionalities) side of Azure Synapse Analytics (formally called Azure SQL Data Warehouse).

One of the more interesting options is ordered clustered columnstore indexes. That seems like something which would be nice to have on-prem. The segment elimination works on-prem today, but ordering is accidental at best. By that, I mean the way that SQL Server loads data into a CCI—roughly, in the order in which you insert it—is not guaranteed to work that way and could change in the future.

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Star Schemas and Power BI

Published 2019-11-14 by Kevin Feasel

Alberto Ferrari explains why star schemas are so important to Power BI:

A common question among data modeling newbies is whether it is better to use a completely flattened data model with only one table, or to invest time in building a proper star schema (you can find a description of star schemas in Introduction to Data Modeling). As coined by Koen Verbeeck, the motto of a seasoned modeler should be “Star Schema all The Things!”

The goal is to demonstrate that a report using a flattened table returns inaccurate numbers, whereas using a star schema turns it into a sound analytical system.

Read on for the example.

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Things a New DBA Should Learn

Published 2019-11-14 by Kevin Feasel

John McCormack has three things new DBAs should learn first:

Help, the SQL Server is on fire and my really important process is not working. Why is the server so slow?

This scenario will happen to you. Invariably, the person (often a manager) will stand over you and expect you to knock out one or two lines of t-sql wizardry to get things running along smoothly again. First of all, I should say that in a perfect world, you will ask them to raise a ticket and you will work on it according to its priority against your other tasks. Then you can let them know what the issue was and what can be done to prevent it happening again. But we rarely work in a perfect world. In this scenario, you need one primary line of t-sql to get started.

John’s three points are a really good starting point.

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Power BI Paginated Reports on the Cheap

Published 2019-11-14 by Kevin Feasel

John White shows how you can get paginated reports in Power BI at a lower cost:

In our scenario, we have a paginated report that uses a published Power BI dataset as a data source. as of this writing, there is no API call available to render a paginated report on demand, so we will rely on the scheduled subscription capability. in order to minimize the cost of the solution, we want the dedicated capacity to run as little as possible.

The solution will consist of an Azure logic app, and Power BI paginated report scheduling. An Azure logic app uses the same set of actions that a Flow in Power automate does, but is a little more flexible in its permissions model.

Read on for the step-by-step instructions.

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SQL Server 2019 Installation Enhancements

Published 2019-11-14 by Kevin Feasel

Aaron Bertrand looks at a couple things you can configure on installation with SQL Server 2019:

One of the long-standing defaults in SQL Server has been the maximum degree of parallelism (MAXDOP), which has always been 0, meaning use (up to) all cores when the engine believes that will help. For many OLTP workloads, 0 is not the optimal setting, and you may want to use a different number depending on the behavior of your workload. I don’t want to belabor the thought process here, but this will be based on settings like the number of cores exposed to SQL Server, whether they are divided into NUMA nodes, and if there are other instances, applications, or services running on the same Windows Server. Microsoft’s guidelines are published here.

Aaron shows us how to set MAXDOP as well as min and max server memory for our new instance. It’s nice to see these types of additions to the setup process—that makes it a bit more likely that the DBA who installs instances only occasionally doesn’t forget to set these afterward.

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Important Assumptions with Linear Models

Published 2019-11-13 by Kevin Feasel

Sebastian Sauer takes us through two of the most important assumptions of linear models:

Additivity and linearity as the second most important assumptions in linear models
We assume that \(y\) is a linear function of the predictors. If y is not a linear function of the predictors, we cannot expect the model to deliver correct insights (predictions, causal coefficients). Let’s check an example.

Read on to understand what this means, as well as the most important assumption.

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Error Log Files and SQL Server Upgrades

Published 2019-11-13 by Kevin Feasel

Mike Hays points out that setting the number of error log files is something which resets on SQL Server upgrade:

This morning when working with one of my SQL Server servers, I went looking for an error log from last August.  After finding that I was only able to go back six days, I checked the directory that stored SQL Server’s error logs,  and noticed a gap in the logs from October to last March.

When I checked the configuration for the error logs in SQL Server Management Studio, I saw that the setting was configured at the default setting of 6 error logs for history.

Read on to understand why this happened.

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Puzzles with Powershell

Published 2019-11-13 by Kevin Feasel

Jana Sattainathan takes us through solving a couple of problems with Powershell:

As I said before, I am a regular at my local PowerShell user group. I keenly look forward to our monthly meetings. We share a lot of PowerShell code/tips/tricks among ourselves. It is a small but close-knit group. Yesterday, one of the members, Jason Walker came up with coding puzzles for the group. This blog post is about the puzzles Jason created for solving using PowerShell. This is the kind of simple stuff that keeps the meetings interesting and fun (besides the Pizza!).

My solutions may not be the most elegant or concise but they work and were created on the fly during the meeting!

Read on for the four puzzles as well as solutions.

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What’s New with Query Store in SSMS 18.4

Published 2019-11-13 by Kevin Feasel

Erin Stellato takes us through changes to Query Store components in SQL Server Management Studio 18.4:

Last week the SQL Server Tools team released a new version of Management Studio, 18.4, and it dropped in the middle of my Query Store full day pre-con on Monday. Those two are related. There were some changes in SSMS 18.4 specific to Query Store, and for a few seconds over lunch I thought about downloading the new version and running it for my afternoon demos. But…I didn’t want to anger the demo Gods, so I stuck with 18.3.

Read on for info on the changes.

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