How to check VLF information in SQL Server (PowerShell)

Introduction

This script will list the actual log size, used log space, number of actual VLFs, number of used VLFs and other related information of all databases in an instance. Besides, the script will proactively list potential log size and the number of potential VLFs.

Scenarios

The script will list information about VLFs of all the databases in an instance.

Script

You can use this script in this way: 
1. Run Microsoft PowerShell as Administrator

2. Run the script in the form: &Path
For example: & "D:\Syncup\OneScript\Julie\GetVLFsInformation.ps1"

3. Press "Enter" and enter the server name.
Note: Server name should be in the format: Server Name\ Instance Name. If it's a default instance, please enter the server name.

4. Press "Enter" and choose between Windows and SQL authentication. If you choose SQL Server authentication, please enter the correct user name and password.

5. When the script finishes running, we'll get the following figure:

Here are some code snippets for your reference.

## Windows Authentication
        if($choice -eq 0)
        {
            #Create SqlConnection object and define connection string
            $Connection = New-Object System.Data.SqlClient.SqlConnection
            $ConnectionB = New-Object System.Data.SqlClient.SqlConnectionStringBuilder
            $ConnectionB["Data Source"] = $ServerName
            $ConnectionB["Database"] = $DatabaseName
            $ConnectionB["Trusted_Connection"] = "SSPI"
            $Connection.ConnectionString = $ConnectionB.ConnectionString
        }

## Windows Authentication
        if($choice -eq 0)
        {
            #Create SqlConnection object and define connection string
            $Connection = New-Object System.Data.SqlClient.SqlConnection
            $ConnectionB = New-Object System.Data.SqlClient.SqlConnectionStringBuilder
            $ConnectionB["Data Source"] = $ServerName
            $ConnectionB["Database"] = $DatabaseName
            $ConnectionB["Trusted_Connection"] = "SSPI"
            $Connection.ConnectionString = $ConnectionB.ConnectionString
        }

SQL Server  2005/SQL Server 2008 R2 /SQL Server 2012

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