functions/Test-DbaIdentityUsage.ps1
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function Test-DbaIdentityUsage { <# .SYNOPSIS Displays information relating to IDENTITY seed usage. Works on SQL Server 2008 and above. .DESCRIPTION IDENTITY seeds have max values based off of their data type. This module will locate identity columns and report the seed usage. .PARAMETER SqlInstance Allows you to specify a comma separated list of servers to query. .PARAMETER SqlCredential Allows you to login to servers using SQL Logins as opposed to Windows Auth/Integrated/Trusted. To use: $cred = Get-Credential, this pass this $cred to the param. Windows Authentication will be used if DestinationSqlCredential is not specified. To connect as a different Windows user, run PowerShell as that user. .PARAMETER Database The database(s) to process - this list is auto-populated from the server. If unspecified, all databases will be processed. .PARAMETER ExcludeDatabase The database(s) to exclude - this list is auto-populated from the server .PARAMETER Threshold Allows you to specify a minimum % of the seed range being utilized. This can be used to ignore seeds that have only utilized a small fraction of the range. .PARAMETER NoSystemDb Allows you to suppress output on system databases .PARAMETER Silent Use this switch to disable any kind of verbose messages .NOTES Author: Brandon Abshire, netnerds.net Tags: Identity Website: https://dbatools.io Copyright: (C) Chrissy LeMaire, clemaire@gmail.com License: GNU GPL v3 https://opensource.org/licenses/GPL-3.0 .LINK https://dbatools.io/Test-DbaIdentityUsage .EXAMPLE Test-DbaIdentityUsage -SqlInstance sql2008, sqlserver2012 Check identity seeds for servers sql2008 and sqlserver2012. .EXAMPLE Test-DbaIdentityUsage -SqlInstance sql2008 -Database TestDB Check identity seeds on server sql2008 for only the TestDB database .EXAMPLE Test-DbaIdentityUsage -SqlInstance sql2008 -Database TestDB -Threshold 20 Check identity seeds on server sql2008 for only the TestDB database, limiting results to 20% utilization of seed range or higher #> [CmdletBinding()] Param ( [parameter(Position = 0, Mandatory = $true, ValueFromPipeline = $True)] [Alias("ServerInstance", "SqlServer", "SqlServers")] [DbaInstanceParameter[]]$SqlInstance, [PSCredential] $SqlCredential, [Alias("Databases")] [object[]]$Database, [object[]]$ExcludeDatabase, [parameter(Position = 1, Mandatory = $false)] [int]$Threshold = 0, [parameter(Position = 2, Mandatory = $false)] [switch]$NoSystemDb, [switch]$Silent ) BEGIN { $sql = ";WITH CT_DT AS ( SELECT 'tinyint' AS DataType, 0 AS MinValue ,255 AS MaxValue UNION SELECT 'smallint' AS DataType, -32768 AS MinValue ,32767 AS MaxValue UNION SELECT 'int' AS DataType, -2147483648 AS MinValue ,2147483647 AS MaxValue UNION SELECT 'bigint' AS DataType, -9223372036854775808 AS MinValue ,9223372036854775807 AS MaxValue ), CTE_1 AS ( SELECT SCHEMA_NAME(o.schema_id) AS SchemaName, OBJECT_NAME(a.Object_id) as TableName, a.Name as ColumnName, seed_value AS SeedValue, CONVERT(bigint, increment_value) as IncrementValue, CONVERT(bigint, ISNULL(a.last_value, seed_value)) AS LastValue, (CASE WHEN CONVERT(bigint, increment_value) < 0 THEN (CONVERT(bigint, seed_value) - CONVERT(bigint, ISNULL(last_value, seed_value)) + (CASE WHEN CONVERT(bigint, seed_value) <> 0 THEN ABS(CONVERT(bigint, increment_value)) ELSE 0 END)) ELSE (CONVERT(bigint, ISNULL(last_value, seed_value)) - CONVERT(bigint, seed_value) + (CASE WHEN CONVERT(bigint, seed_value) <> 0 THEN ABS(CONVERT(bigint, increment_value)) ELSE 0 END)) END) / ABS(CONVERT(bigint, increment_value)) AS NumberOfUses, CAST ( (CASE WHEN CONVERT(bigint, increment_value) < 0 THEN ABS(CONVERT(bigint,dt.MinValue) - CONVERT(bigint, seed_value) - (CASE WHEN CONVERT(bigint, seed_value) <> 0 THEN ABS(CONVERT(bigint, increment_value)) ELSE 0 END)) ELSE CONVERT(bigint,dt.MaxValue) - CONVERT(bigint, seed_value) + (CASE WHEN CONVERT(bigint, seed_value) <> 0 THEN ABS(CONVERT(bigint, increment_value)) ELSE 0 END) END) / ABS(CONVERT(bigint, increment_value)) AS Numeric(20, 0)) AS MaxNumberRows FROM sys.identity_columns a INNER JOIN sys.objects o ON a.object_id = o.object_id INNER JOIN sys.types As b ON a.system_type_id = b.system_type_id INNER JOIN CT_DT dt ON b.name = dt.DataType WHERE a.seed_value is not null ), CTE_2 AS ( SELECT SchemaName, TableName, ColumnName, CONVERT(BIGINT, SeedValue) AS SeedValue, CONVERT(BIGINT, IncrementValue) AS IncrementValue, LastValue, ABS(CONVERT(FLOAT,MaxNumberRows)) AS MaxNumberRows, NumberOfUses, CONVERT(Numeric(18,2), ((CONVERT(Float, NumberOfUses) / ABS(CONVERT(FLOAT,MaxNumberRows)) * 100))) AS [PercentUsed] FROM CTE_1 ) SELECT DB_NAME() as DatabaseName, SchemaName, TableName, ColumnName, SeedValue, IncrementValue, LastValue, MaxNumberRows, NumberOfUses, [PercentUsed] FROM CTE_2" if ($Threshold -gt 0) { $sql += " WHERE [PercentUsed] >= " + $Threshold + " ORDER BY [PercentUsed] DESC" } else { $sql += " ORDER BY [PercentUsed] DESC" } } process { foreach ($instance in $SqlInstance) { Write-Message -Level Verbose -Message "Attempting to connect to $instance" try { $server = Connect-SqlInstance -SqlInstance $instance -SqlCredential $SqlCredential -MinimumVersion 10 } catch { Stop-Function -Message "Failure" -Category ConnectionError -ErrorRecord $_ -Target $instance -Continue } $dbs = $server.Databases if ($Database) { $dbs = $dbs | Where-Object {$Database -contains $_.Name} } if ($ExcludeDatabase) { $dbs = $dbs | Where-Object Name -NotIn $ExcludeDatabase } if ($NoSystemDb) { $dbs = $dbs | Where-Object IsSystemObject -eq $false } foreach ($db in $dbs) { Write-Message -Level Verbose -Message "Processing $db on $instance" if ($db.IsAccessible -eq $false) { Stop-Function -Message "The database $db is not accessible. Skipping database." -Continue } foreach ($row in $db.ExecuteWithResults($sql).Tables[0]) { if ($row.PercentUsed -eq [System.DBNull]::Value) { continue } if ($row.PercentUsed -ge $threshold) { [PSCustomObject]@{ ComputerName = $server.NetName InstanceName = $server.ServiceName SqlInstance = $server.DomainInstanceName Database = $row.DatabaseName Schema = $row.SchemaName Table = $row.TableName Column = $row.ColumnName SeedValue = $row.SeedValue IncrementValue = $row.IncrementValue LastValue = $row.LastValue MaxNumberRows = $row.MaxNumberRows NumberOfUses = $row.NumberOfUses PercentUsed = $row.PercentUsed } } } } } } } |