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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,284 @@ | ||
| Function Find-SqlUnusedIndex | ||
| { | ||
| <# | ||
| .SYNOPSIS | ||
| Find Unused indexes | ||
| .DESCRIPTION | ||
| This command will help you to find Unused indexes on a database or a list of databases | ||
| Also tells how much space you can save by dropping the index. | ||
| We show the type of compression so you can make a more considered decision. | ||
| For now only supported for CLUSTERED and NONCLUSTERED indexes | ||
| You can select the indexes you want to drop on the gridview and by click OK the drop statement will be generated. | ||
| Output: | ||
| TableName | ||
| IndexName | ||
| KeyCols | ||
| IncludedCols | ||
| IndexSizeMB | ||
| IndexType | ||
| CompressionDesc (When 2008+) | ||
| NumberRows | ||
| IsDisabled | ||
| IsFiltered (When 2008+) | ||
| .PARAMETER SqlServer | ||
| The SQL Server instance. | ||
| .PARAMETER SqlCredential | ||
| Allows you to login to servers using SQL Logins as opposed to Windows Auth/Integrated/Trusted. To use: | ||
| $scred = Get-Credential, then pass $scred object to the -SqlCredential parameter. | ||
| Windows Authentication will be used if SqlCredential is not specified. SQL Server does not accept Windows credentials being passed as credentials. To connect as a different Windows user, run PowerShell as that user. | ||
| .PARAMETER FileName | ||
| The file to write to. | ||
| .PARAMETER NoClobber | ||
| Do not overwrite file | ||
| .PARAMETER Append | ||
| Append to file | ||
| .NOTES | ||
| Original Author: Aaron Nelson (@SQLvariant), SQLvariant.com | ||
| dbatools PowerShell module (https://dbatools.io, [email protected]) | ||
| Copyright (C) 2016 Chrissy LeMaire | ||
| This program is free software: you can redistribute it and/or modify | ||
| it under the terms of the GNU General Public License as published by | ||
| the Free Software Foundation, either version 3 of the License, or | ||
| (at your option) any later version. | ||
| This program is distributed in the hope that it will be useful, | ||
| but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| GNU General Public License for more details. | ||
| You should have received a copy of the GNU General Public License | ||
| along with this program. If not, see <http://www.gnu.org/licenses/>. | ||
| .LINK | ||
| https://dbatools.io/Find-SqlUnusedIndex | ||
| .EXAMPLE | ||
| Find-SqlUnusedIndex -SqlServer sql2005 -FileName C:\temp\sql2005-UnusedIndexes.sql | ||
| Exports SQL for the Unused indexes in server "sql2005" choosen on grid-view and writes them to the file "C:\temp\sql2005-UnusedIndexes.sql" | ||
| .EXAMPLE | ||
| Find-SqlUnusedIndex -SqlServer sqlserver2016 -SqlCredential $cred | ||
| Will find exact Unused indexes on all user databases present on sqlserver2016 will be verified using SQL credentials. | ||
| .EXAMPLE | ||
| Find-SqlUnusedIndex -SqlServer sqlserver2016 -Databases db1, db2 | ||
| Will find exact Unused indexes on both db1 and db2 databases | ||
| .EXAMPLE | ||
| Find-SqlUnusedIndex -SqlServer sqlserver2016 | ||
| Will find exact Unused indexes on all user databases | ||
| #> | ||
| [CmdletBinding(SupportsShouldProcess = $true)] | ||
| Param ( | ||
| [parameter(Mandatory = $true, ValueFromPipeline = $true)] | ||
| [Alias("ServerInstance", "SqlInstance")] | ||
| [object[]]$SqlServer, | ||
| [object]$SqlCredential, | ||
| [Alias("OutFile", "Path")] | ||
| [string]$FilePath, | ||
| [switch]$NoClobber, | ||
| [switch]$Append | ||
| ) | ||
| DynamicParam { if ($SqlServer) { return Get-ParamSqlDatabases -SqlServer $SqlServer -SqlCredential $SqlCredential } } | ||
|
|
||
| BEGIN | ||
| { | ||
|
|
||
| # Support Compression 2008+ | ||
| $CompletelyUnusedQuery = "SELECT DB_NAME(database_id) AS 'DatabaseName', | ||
| s.name AS 'SchemaName', | ||
| t.name AS 'TableName', | ||
| i.object_id , | ||
| i.name AS 'IndexName', | ||
| i.index_id, | ||
| i.type_desc , | ||
| user_seeks , | ||
| user_scans , | ||
| user_lookups , | ||
| user_updates , | ||
| last_user_seek , | ||
| last_user_scan , | ||
| last_user_lookup , | ||
| last_user_update , | ||
| system_seeks , | ||
| system_scans , | ||
| system_lookups , | ||
| system_updates , | ||
| last_system_seek , | ||
| last_system_scan , | ||
| last_system_lookup , | ||
| last_system_update | ||
| FROM SYS.TABLES T | ||
| JOIN SYS.SCHEMAS S | ||
| ON T.schema_id = s.schema_id | ||
| JOIN SYS.indexes i | ||
| ON i.object_id = t.object_id | ||
| LEFT OUTER JOIN sys.dm_db_index_usage_stats iu | ||
| ON iu.object_id = i.object_id | ||
| AND iu.index_id = i.index_id | ||
| WHERE iu.database_id = DB_ID() | ||
| AND OBJECTPROPERTY(i.[object_id], 'IsMSShipped') = 0 | ||
| AND user_seeks = 0 | ||
| AND user_scans = 0 | ||
| AND user_lookups = 0 | ||
| AND i.type_desc NOT IN ('HEAP', 'CLUSTERED COLUMNSTORE')" | ||
|
|
||
| if ($FilePath.Length -gt 0) | ||
| { | ||
| $directory = Split-Path $FilePath | ||
| $exists = Test-Path $directory | ||
|
|
||
| if ($exists -eq $false) | ||
| { | ||
| throw "Parent directory $directory does not exist" | ||
| } | ||
| } | ||
|
|
||
| Write-Output "Attempting to connect to Sql Server.." | ||
| $sourceserver = Connect-SqlServer -SqlServer $SqlServer -SqlCredential $SqlCredential | ||
| } | ||
|
|
||
| PROCESS | ||
| { | ||
|
|
||
| if ($sourceserver.versionMajor -lt 9) | ||
| { | ||
| throw "This function does not support versions lower than SQL Server 2005 (v9)" | ||
| } | ||
|
|
||
| # Convert from RuntimeDefinedParameter object to regular array | ||
| $databases = $psboundparameters.Databases | ||
|
|
||
| if ($pipedatabase.Length -gt 0) | ||
| { | ||
| $Source = $pipedatabase[0].parent.name | ||
| $databases = $pipedatabase.name | ||
| } | ||
|
|
||
| if ($databases.Count -eq 0) | ||
| { | ||
| $databases = ($sourceserver.Databases | Where-Object {$_.isSystemObject -eq 0 -and $_.Status -ne "Offline"}).Name | ||
| } | ||
|
|
||
| if ($databases.Count -gt 0) | ||
| { | ||
| foreach ($db in $databases) | ||
| { | ||
| try | ||
| { | ||
| Write-Output "Getting indexes from database '$db'" | ||
|
|
||
| $query = $CompletelyUnusedQuery | ||
|
|
||
| $UnusedIndex = $sourceserver.Databases[$db].ExecuteWithResults($query) | ||
|
|
||
| $scriptGenerated = $false | ||
|
|
||
| if ($UnusedIndex.Tables[0].Rows.Count -gt 0) | ||
| { | ||
| $indexesToDrop = $UnusedIndex.Tables[0] | Out-GridView -Title "Unused Indexes on $($db) database - Choose indexes to generate DROP script" -PassThru | ||
|
|
||
| #When only 1 line selected, the count does not work | ||
| if ($indexesToDrop.Count -gt 0 -or !([string]::IsNullOrEmpty($indexesToDrop))) | ||
| { | ||
| #reset to #Yes | ||
| $result = 0 | ||
|
|
||
| if ($UnusedIndex.Tables[0].Rows.Count -eq $indexesToDrop.Count) | ||
| { | ||
| $title = "Indexes to drop on databases '$db':" | ||
| $message = "You will generate drop statements to all indexes.`r`nPerhaps you want to keep at least one.`r`nDo you wish to generate the script anyway? (Y/N)" | ||
| $yes = New-Object System.Management.Automation.Host.ChoiceDescription "&Yes", "Will continue" | ||
| $no = New-Object System.Management.Automation.Host.ChoiceDescription "&No", "Will exit" | ||
| $options = [System.Management.Automation.Host.ChoiceDescription[]]($yes, $no) | ||
| $result = $host.ui.PromptForChoice($title, $message, $options, 0) | ||
| } | ||
|
|
||
| if ($result -eq 0) #default OR answer = YES | ||
| { | ||
| $sqlDropScript = "/*`r`n" | ||
| $sqlDropScript += "`tScript generated @ $(Get-Date -format "yyyy-MM-dd HH:mm:ss.ms")`r`n" | ||
| $sqlDropScript += "`tDatabase: $($db)`r`n" | ||
| $sqlDropScript += "`tConfirm that you have choosen the right indexes before execute the drop script`r`n" | ||
| $sqlDropScript += "*/`r`n" | ||
|
|
||
| foreach ($index in $indexesToDrop) | ||
| { | ||
| if ($FilePath.Length -gt 0) | ||
| { | ||
| Write-Output "Exporting $($index.TableName).$($index.IndexName)" | ||
| } | ||
|
|
||
| $sqlDropScript += "USE [$($index.DatabaseName)]`r`n" | ||
| $sqlDropScript += "GO`r`n" | ||
| $sqlDropScript += "IF EXISTS (SELECT 1 FROM sys.indexes WHERE [object_id] = OBJECT_ID('$($index.TableName)') AND name = '$($index.IndexName)')`r`n" | ||
| $sqlDropScript += " DROP INDEX $($index.TableName).$($index.IndexName)`r`n" | ||
| $sqlDropScript += "GO`r`n`r`n" | ||
| } | ||
|
|
||
| if ($FilePath.Length -gt 0) | ||
| { | ||
| $sqlDropScript | Out-File -FilePath $FilePath -Append:$Append -NoClobber:$NoClobber | ||
| } | ||
| else | ||
| { | ||
| Write-Output $sqlDropScript | ||
| } | ||
|
|
||
| $scriptGenerated = $true | ||
| } | ||
| else #answer = no | ||
| { | ||
| Write-Warning "Script will not be generated for database '$db'" | ||
| } | ||
| } | ||
| } | ||
| else | ||
| { | ||
| Write-Output "No Unused indexes found!" | ||
| } | ||
| } | ||
| catch | ||
| { | ||
| throw $_ | ||
| } | ||
| } | ||
|
|
||
| if ($scriptGenerated) | ||
| { | ||
| Write-Warning "Confirm the generated script before execute!" | ||
| } | ||
| if ($FilePath.Length -gt 0) | ||
| { | ||
| Write-Output "Script generated to $FilePath" | ||
| } | ||
| } | ||
| else | ||
| { | ||
| Write-Output "There are no databases to analyse." | ||
| } | ||
| } | ||
|
|
||
| END | ||
| { | ||
| $sourceserver.ConnectionContext.Disconnect() | ||
| } | ||
| } |
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