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Category: Powershell

Reviewing the Windows Event Log with Powershell

Published 2020-08-05 by Kevin Feasel

Jess Pomfret takes us through an improvement to the old Get-EventLog cmdlet:

Recently I was tasked with troubleshooting an incident on a SQL Server at a certain point in the past, the issue being a high CPU alert.  It’s hard (without monitoring solutions set up) to go back in time and determine what the issue is.  However, one thing we can check is the windows event log to see if there was anything happening on the server at that time.

Now, you probably know that my favourite tool of choice is PowerShell, so let’s take a look at how we can use Get-WinEvent to see what was happening in the past.

Get-WinEvent is the newer revamped version of Get-EventLog, and there are two improvements I believe are worth mentioning. Firstly, with the introduction of filter parameters we can now find certain events much easier, which we’ll talk about a little later. Secondly, the performance of Get-WinEvent is much faster than using the legacy command.  I believe this is due to the filtering happening at the event engine instead of within PowerShell.

Those are some rather welcome improvements.

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Finding Running SQL Agent Jobs

Published 2020-08-05 by Kevin Feasel

Garry Bargsley has a quick dbatools script to find running SQL Agent jobs:

Do you run SQL Agent Jobs in your environment?  Do you know what is running at any given time?  Most people do not know what is currently running if you ask them.

There are several times I need to know what job(s) is running on which server. For instance, let’s say on the morning of monthly maintenance you want to check to make sure all your important ETL jobs are complete or that there are currently no database backup jobs running.

Read on to see the cmdlet and how you can use it to query across a broad set of servers.

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Creating Executables from Powershell Scripts

Published 2020-08-03 by Kevin Feasel

Patrick Gruenauer introduces us to an interesting tool:

Have you ever dreamed of creating exe files out of your PowerShell scripts? If yes, read on. In this post I will show you how you can create exe files with a small and simple program called ps2exe.

Read on to see how it works. Then give it a try and wallow in the fact that some Powershell-wielding production DBA who absolutely is not a developer and doesn’t write code like developers slowly realizes that the developer call was coming from inside the house.

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Sending Messages from SQL Agent to Microsoft Teams

Published 2020-07-31 by Kevin Feasel

Rob Sewell is waiting for a message and it comes in two parts. First up, sending SQL Agent results to a Teams channel:

Using dbatools we can create a simple script to gather the results of Agent Jobs form a list of instances. Maybe it would be good to be able to get the job runs results every 12 hours so that at 6am in the morning the early-bird DBA can quickly identify if there are any failures that need immediate action and at 6pm , the team can check that everything was ok before they clock off.

But that’s not enough for Rob:

Following on from yesterdays post about creating an overview of SQL Agent Job Results and sending it to a Teams channel, I was given another challenge

Can you write a job step that I can add to SQL Agent jobs that can send the result of that job to a Teams Channel

The use case was for some migration projects that had steps that were scheduled via SQL Agent Jobs and instead of the DBA having to estimate when they would finish and keep checking so that they could let the next team know that it was time for their part to start, they wanted it to notify a Teams channel. This turned out especially useful as the job finished earlier than expected at 3am and the off-shore team could begin their work immediately.

Read the whole thing, as Rob has some detailed code examples.

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Discovering Provider-Specific Commands in Powershell

Published 2020-07-24 by Kevin Feasel

Jeffrey Hicks performs some Powershell research:

I’ve been diving into PowerShell help lately while preparing my next Pluralsight course. One of the sad things I have discovered is the loss of provider-aware help. As you may know, some commands have parameters that only exist when using a specific PSDrive.  For example, the -File parameter for Get-ChildItem only works in the file system. If you change to the CERT: PSDrive that parameter isn’t available. But you do get a new parameter like -CodeSigningCert. It used to be that you could use help to discover these differences. Get-Help has a -Path parameter to assist you.

Sadly, at least for me as a PowerShell teacher, this no longer works, especially if you have updated help recently in Windows PowerShell. Microsoft is working on some updates to how Help is delivered but for now we might need alternatives.

Read on for alternatives.

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Assuming a Role with AWS Powershell Tools

Published 2020-07-23 by Kevin Feasel

Sheldon Hull solves a problem:

I’ve had some issues in the past working with AWS.Tools PowerShell SDK and correctly assuming credentials.

By default, most of the time it was easier to use a dedicated IAM credential setup for the purpose.

However, as I’ve wanted to run some scripts across multiple accounts, the need to simplify by assuming a role has been more important.

It’s also a better practice than having to manage multiple key rotations in all accounts.

Read on to see how far Sheldon has been able to take this, but also how much more work is left to do.

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Finding and Downloading SQL Server Updates

Published 2020-07-22 by Kevin Feasel

Andy Levy combines dbatools and KBUpdate:

Another of Chrissy LeMaire’s (blog | twitter) projects is KBUpdate. Compared to dbatools it’s a pretty compact module, but it’s incredibly useful – it’ll seek out information about KB updates and even download them for you! She’s also rolled these functions into dbatools for convenience, so we don’t need to install or import that module separately.

Read on to see how Andy ties it all together.

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Secrets Management in Powershell Demos

Published 2020-07-21 by Kevin Feasel

Rob Sewell is happy to stop using Import-Clixml:

I love notebooks and to show some people who had asked about storing secrets, I have created some. So, because I am efficient lazy I have embedded them here for you to see. You can find them in my Jupyter Notebook repository

https://beard.media/dotnetnotebooks

Rob has a follow-up on the topic:

Following on from my last post about the Secret Management module. I was asked another question.

> Can I use this to run applications as my admin account?

A user with a beard

Well, Rob has a notebook for that.

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Minimum Permissions Required for Get-DbaDbUser

Published 2020-07-16 by Kevin Feasel

Shane O’Neill walks us through wants to figure out minimum permissions required for the Get-DbaDbUser cmdlet in dbatools:

I’m not going to sugarcoat things – the person that sent me the request has more access than they rightly need. The “public” access worker did not need any of that access so I wasn’t going to just give her the same level.

Plus, we’re supposed to be a workforce that has embraced the DevOps spirit and DevOps is nothing if it doesn’t include Security in it.

So, if I could find a way to give the user enough permission to run the command and not a lot more, then the happier I would be.

Shane takes us through the process so we don’t have to.

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Learning About Index Utilization with dbatools

Published 2020-07-16 by Kevin Feasel

Ben Miller takes us through a way to know your data:

You have many tables in your databases and you want to know how they are used. There are DMVs for index usage stats which will tell you about like sys.dm_db_index_usage_stats and querying them is insightful, but how do the stats change over time? These stats are reset when the instance is restarted and it is good to know that you have 2000 seeks and 500 scans of the index, but when did they happen? Was it on a common day? Common hour?

Ben has a way to help you figure that out.

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