functions/Set-SqlTempDBConfiguration.ps1

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
function Set-SqlTempDbConfiguration
{
<#
.SYNOPSIS
Sets tempdb data and log files according to best practices.
 
.DESCRIPTION
Function to calculate tempdb size and file configurations based on passed parameters, calculated values, and Microsoft
best practices. User must declare SQL Server to be configured and total data file size as mandatory values. Function will
then calculate number of data files based on logical cores on the target host and create evenly sized data files based
on the total data size declared by the user, with a log file 25% of the total data file size. Other parameters can adjust
the settings as the user desires (such as different file paths, number of data files, and log file size). The function will
not perform any functions that would shrink or delete data files. If a user desires this, they will need to reduce tempdb
so that it is "smaller" than what the function will size it to before runnint the function.
 
.NOTES
Original Author: Michael Fal (@Mike_Fal), http://mikefal.net
 
dbatools PowerShell module (https://dbatools.io, clemaire@gmail.com)
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/>.
 
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
 
.PARAMETER SqlServer
SQLServer name or SMO object representing the SQL Server to connect to
 
.PARAMETER SqlCredential
PSCredential object to connect under. If not specified, currend Windows login will be used.
 
.PARAMETER DataFileCount
Integer of number of datafiles to create. If not specified, function will use logical cores of host.
 
.PARAMETER DataFileSizeMB
Total data file size in megabytes
 
.PARAMETER LogFileSizeMB
Log file size in megabyes. If not specified, function will use 25% of total data file size.
 
.PARAMETER DataPath
File path to create tempdb data files in. If not specified, current tempdb location will be used.
 
.PARAMETER LogPath
File path to create tempdb log file in. If not specified, current tempdb location will be used.
 
.PARAMETER Script
Switch to generate script for tempdb configuration.
 
.PARAMETER OutFile
Path to file to save the generated script for tempdb configuration
 
.PARAMETER WhatIf
Switch to generate configuration object.
 
.PARAMETER Confirm
Prompts you for confirmation before executing any changing operations within the command.
 
.LINK
https://dbatools.io/Set-SqltempdbConfiguration
 
.EXAMPLE
Set-SqltempdbConfiguration -SqlServer localhost -DataFileSizeMB 1000
 
Creates tempdb with a number of datafiles equal to the logical cores where
each one is equal to 1000MB divided by number of logical cores and a log file
of 250MB
 
.EXAMPLE
Set-SqltempdbConfiguration -SqlServer localhost -DataFileSizeMB 1000 -DataFileCount 8
 
Creates tempdb with a number of datafiles equal to the logical cores where
each one is equal to 125MB and a log file of 250MB
 
.EXAMPLE
Set-SqltempdbConfiguration -SqlServer localhost -DataFileSizeMB 1000 -Script
 
Provides a SQL script output to configure tempdb according to the passed parameters
 
.EXAMPLE
Set-SqltempdbConfiguration -SqlServer localhost -DataFileSizeMB 1000 -Script
 
Returns PSObject representing tempdb configuration.
#>

[CmdletBinding(SupportsShouldProcess = $true)]
param (
[parameter(Mandatory = $true)]
[Alias("ServerInstance", "SqlInstance")]
[object]$SqlServer,
[System.Management.Automation.PSCredential]$SqlCredential,
[int]$DataFileCount,
[Parameter(Mandatory = $true)]
[int]$datafilesizemb,
[int]$LogFileSizeMB,
[string]$DataPath,
[string]$LogPath,
[string]$OutFile,
[switch]$Script
)
BEGIN
{
$sql = @()
Write-Verbose "Connecting to $SqlServer"
$server = Connect-SqlServer $SqlServer -SqlCredential $SqlCredential

if ($server.VersionMajor -lt 9)
{
throw "SQL Server 2000 is not supported"
}
}

PROCESS
{
$cores = $server.Processors
if ($cores -gt 8) { $cores = 8 }

#Set DataFileCount if not specified. If specified, check against best practices.
if (-not $datafilecount)
{
$datafilecount = $cores
Write-Verbose "Data file count set to number of cores: $datafilecount"
}
else
{
if ($datafilecount -gt $cores)
{
Write-Warning "Data File Count of $datafilecount exceeds the Logical Core Count of $cores. This is outside of best practices."
}
Write-Verbose "Data file count set explicitly: $datafilecount"
}

$dataFilesizeSingleMB = $([Math]::Floor($datafilesizemb/$datafilecount))
Write-Verbose "Single data file size (MB): $dataFilesizeSingleMB"

if ($datapath)
{
if ((Test-SqlPath -SqlServer $server -Path $datapath) -eq $false)
{
throw "$datapath is an invalid path."
}
}
else
{
$filepath = $server.Databases['tempdb'].ExecuteWithResults('SELECT physical_name as FileName FROM sys.database_files WHERE file_id = 1').Tables[0].FileName
$datapath = Split-Path $filepath
}

Write-Verbose "Using data path: $datapath"

if ($logpath)
{
if ((Test-SqlPath -SqlServer $server -Path $logpath) -eq $false)
{
throw "$logpath is an invalid path."
}
}
else
{
$filepath = $server.Databases['tempdb'].ExecuteWithResults('SELECT physical_name as FileName FROM sys.database_files WHERE file_id = 2').Tables[0].FileName
$logpath = Split-Path $filepath
}
Write-Verbose "Using log path: $logpath"

$LogSizeMBActual = if (-not $LogFileSizeMB) { $([Math]::Floor($datafilesizemb/4)) }

$config = [PSCustomObject]@{
SqlServer = $server.Name
DataFileCount = $datafilecount
DataFileSizeMB = $datafilesizemb
SingleDataFileSizeMB = $dataFilesizeSingleMB
LogSizeMB = $LogSizeMBActual
DataPath = $datapath
LogPath = $logpath
}

# Check current tempdb. Throw an error if current tempdb is 'larger' than config.
$currentfilecount = $server.Databases['tempdb'].ExecuteWithResults('SELECT count(1) as FileCount FROM sys.database_files WHERE type=0').Tables[0].FileCount
$toobigcount = $server.Databases['tempdb'].ExecuteWithResults("SELECT count(1) as FileCount FROM sys.database_files WHERE size/128 > $dataFilesizeSingleMB AND type = 0").Tables[0].FileCount

if ($currentfilecount -gt $datafilecount)
{
throw "Current tempdb not suitable to be reconfigured. The current tempdb has a greater number of files than the calculated configuration."
}

if ($toobigcount -gt 0)
{
throw "Current tempdb not suitable to be reconfigured. The current tempdb is larger than the calculated configuration."
}

$equalcount = $server.Databases['tempdb'].ExecuteWithResults("SELECT count(1) as FileCount FROM sys.database_files WHERE size/128 = $dataFilesizeSingleMB AND type = 0").Tables[0].FileCount

if ($equalcount -gt 0)
{
throw "Current tempdb not suitable to be reconfigured. The current tempdb is the same size as the specified DataFileSizeMB."
}

Write-Verbose "tempdb configuration validated."

$datafiles = $server.Databases['tempdb'].ExecuteWithResults("select f.Name, f.physical_name as FileName from sys.filegroups fg join sys.database_files f on fg.data_space_id = fg.data_space_id where fg.name = 'PRIMARY' and f.type_desc = 'ROWS'").Tables[0]

#Checks passed, process reconfiguration
for ($i = 0; $i -lt $datafilecount; $i++)
{
$file = $datafiles.Rows[$i]
if ($file)
{
$filename = Split-Path $file.FileName -Leaf
$logicalname = $file.Name
$newpath = "$datapath\$filename"
$sql += "ALTER DATABASE tempdb MODIFY FILE(name=$logicalname,filename='$newpath',size=$dataFilesizeSingleMB MB,filegrowth=512MB);"
}
else
{
$newname = "tempdev$i.ndf"
$newpath = "$datapath\$newname"
$sql += "ALTER DATABASE tempdb ADD FILE(name=tempdev$i,filename='$newpath',size=$dataFilesizeSingleMB MB,filegrowth=512MB);"
}
}

if (-not $LogFileSizeMB)
{
$LogFileSizeMB = [Math]::Floor($datafilesizemb/4)
}

$logfile = $server.Databases['tempdb'].ExecuteWithResults("SELECT name, physical_name as FileName FROM sys.database_files WHERE file_id = 2").Tables[0]
$filename = Split-Path $logfile.FileName -Leaf
$logicalname = $logfile.Name
$newpath = "$logpath\$filename"
$sql += "ALTER DATABASE tempdb MODIFY FILE(name=$logicalname,filename='$newpath',size=$LogFileSizeMB MB,filegrowth=512MB);"

Write-Verbose "SQL Statement to resize tempdb"
Write-Verbose ($sql -join "`n`n")

if ($Script)
{
return $sql
}
elseif ($OutFile)
{
$sql | Set-Content -Path $OutFile
}
else
{
If ($Pscmdlet.ShouldProcess($SqlServer, "Executing $sql and informing that a restart is required."))
{
try
{
$server.Databases['master'].ExecuteNonQuery($sql)
Write-Verbose "tempdb successfully reconfigured"
Write-Warning "tempdb reconfigured. You must restart the SQL Service for settings to take effect."
}
catch
{
# write-exception writes the full exception to file
Write-Exception $_
throw "Unable to reconfigure tempdb"
}
}
}
}

END
{
$server.ConnectionContext.Disconnect()
}
}