1. Introduction to PowerShell
Focused on SQL Server
Piotr Palka

2. Basics of PowerShell Scripting language Command line interpreter
Object oriented (not text based)
“Cmdlet”:
Verb – noun –parameter
Get-Process
Get-Help

3. Enable SQL Server integration
Start “PowerShell ISE”
Set-ExecutionPolicy -ExecutionPolicy RemoteSigned
Requires local admin priviledges
Set-ExecutionPolicy -Scope CurrentUser
-ExecutionPolicy RemoteSigned -Force
No special privileges needed
Import-Module SqlServer

4. Variables Sample script: Special variables
$varDate = Get-Date $var1
"***************************"
"Day of the year : " + $varDate.DayOfYear
$varDate.AddDays(4)
Special variables
$_ - The current pipeline object
$Args – parameters for current function call
$Error – last error

5. Comparison Operators 5 > 3 is not comparison in PowerShell!!!!!!!
if ( 5 > 3 ) { "T" } else { "F" }
Result: F
What happened?

6. Comparison Operators
Use instead: if ( 5 -ge 3 ) { "T" } else { "F" } -eq Equal -ne Not equal -ge Greater than or equal -gt Greater than -lt Less than -le Less than or equal And many more…

7. Logical operators -and Logical And -or Logical Or -not logical not
if (( 5 -ge 3 ) -and (5 -eq 4)) { "T" } else { "F" }

8. Basic queries
Invoke-Sqlcmd -ServerInstance . -Database TestDB1 -Query "select GetDate()"
Demo – accessing query results

9. Iterations ForEach Collections can be created as:
Performs an operation against each item in a collection
Collections can be created as:
Hardcoded list (in a script), e.g. list of server names
Loaded from SQL query
Loaded from file
ForEach can be used to run scripts on multiple servers/DBs
Demo

10. Monitoring and mass actions
For Each database:
SELECT physical_name, state, state_desc, size, max_size, growth FROM sys.database_files
If file meets logical condition do something:
if ($f.size -ge 2000) {
Backup file }
We can use best of scripting language and SQL

11. Scheduling

12. Questions?