DSCResources/MSFT_xSQLServerMemory/MSFT_xSQLServerMemory.psm1

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
$currentPath = Split-Path -Parent $MyInvocation.MyCommand.Path
Write-Verbose -Message "CurrentPath: $currentPath"

# Load Common Code
Import-Module $currentPath\..\..\xSQLServerHelper.psm1 -Verbose:$false -ErrorAction Stop

function Get-TargetResource
{
    [CmdletBinding()]
    [OutputType([System.Collections.Hashtable])]
    param
    (
        [ValidateSet("Present","Absent")]
        [System.String]
        $Ensure,

        [parameter(Mandatory = $true)]
        [System.Boolean]
        $DynamicAlloc,

        [System.Int32]
        $MinMemory = -1,

        [System.Int32]
        $MaxMemory,

        [System.String]
        $SQLServer = $env:COMPUTERNAME,

        [parameter(Mandatory = $true)]
        [System.String]
        $SQLInstanceName
    )

        if(!$SQL)
        {
            $SQL = Connect-SQL -SQLServer $SQLServer -SQLInstanceName $SQLInstanceName
        }

        if($SQL)
        {
            $GetMinMemory = $sql.Configuration.MinServerMemory.ConfigValue
            $GetMaxMemory = $sql.Configuration.MaxServerMemory.ConfigValue
        }

        if ($GetMaxMemory -eq 2147483647)
        {
            $Ensure = "Absent"
        }
        else
        {
            $Ensure = "Present"
        }

        $returnValue = @{
                DynamicAlloc = $DynamicAlloc
                MinMemory = $MinMemory
                MaxMemory = $MaxMemory
                Ensure = $Ensure
                }
        $returnValue
}


function Set-TargetResource
{
    [CmdletBinding()]
    param
    (
        [ValidateSet("Present","Absent")]
        [System.String]
        $Ensure,

        [parameter(Mandatory = $true)]
        [System.Boolean]
        $DynamicAlloc,

        [System.Int32]
        $MinMemory = -1,

        [System.Int32]
        $MaxMemory,

        [System.String]
        $SQLServer = $env:COMPUTERNAME,

        [parameter(Mandatory = $true)]
        [System.String]
        $SQLInstanceName
    )

    if(!$SQL)
    {
        $SQL = Connect-SQL -SQLServer $SQLServer -SQLInstanceName $SQLInstanceName
    }

    If($SQL)
    {
        $serverMem = $sql.PhysicalMemory
        switch($Ensure)
        {
            "Absent"
            {
                   $MaxMemory = 2147483647
                   $MinMemory = 128
            }
            "Present"
            {       
                if ($DynamicAlloc)
                {
                    if ($serverMem -ge 128000) 
                    {
                        #Server mem - 10GB
                        $MaxMemory = $serverMem - 10000 
                    }
                    elseif ($serverMem -ge 32000 -and $serverMem -lt 128000) 
                    {
                        #Server mem - 4GB
                        $MaxMemory = $serverMem - 4000
                    }
                    elseif ($serverMem -ge 16000)
                    {
                        #Server mem - 2GB
                        $MaxMemory = $serverMem - 2000
                    }
                    else
                    {
                        #Server mem - 1GB
                        $MaxMemory = $serverMem - 1000
                    }
                }
                else
                {
                    if  (-not $MaxMemory -or $MinMemory -lt 0) {
                        throw "Dynamic Allocation is not set. Valid values were not supplied for MaxMemory or MinMemory."
                    }

                    if ($MinMemory -gt $MaxMemory) {
                        throw "Provided MinMemory value is greater than MaxMemory."
                    }
                }
            }
        }
        try
        {            
            $sql.Configuration.MaxServerMemory.ConfigValue = $MaxMemory
            if($MinMemory -ge 0)
            {
                Write-Verbose -message "MinMem will be set to $MinMemory."
                $sql.Configuration.MinServerMemory.ConfigValue = $MinMemory
            }
            $sql.alter()
            New-VerboseMessage -Message "SQL Server Memory has been capped to $MaxMemory."
        }
        catch
        {
            New-VerboseMessage -Message "Failed setting Min and Max SQL Memory"
        }
    }
}


function Test-TargetResource
{
    [CmdletBinding()]
    [OutputType([System.Boolean])]
    param
    (
        [ValidateSet("Present","Absent")]
        [System.String]
        $Ensure,

        [parameter(Mandatory = $true)]
        [System.Boolean]
        $DynamicAlloc,

        [System.Int32]
        $MinMemory = -1,

        [System.Int32]
        $MaxMemory,

        [System.String]
        $SQLServer = $env:COMPUTERNAME,
        
        [parameter(Mandatory = $true)]
        [System.String]
        $SQLInstanceName
    )

    if(!$SQL)
    {
        $SQL = Connect-SQL -SQLServer $SQLServer -SQLInstanceName $SQLInstanceName
    }

    if($SQL)
    {
        $GetMinMemory = $sql.Configuration.MinServerMemory.ConfigValue
        $GetMaxMemory = $sql.Configuration.MaxServerMemory.ConfigValue
    }

    switch($Ensure)
    {
        "Absent"
        {
            if ($GetMaxMemory  -eq 2147483647)
            {
                New-VerboseMessage -Message "Current Max Memory is $GetMaxMemory. Min Memory is $GetMinMemory"
                return $true
            }
            else 
            {
                New-VerboseMessage -Message "Current Max Memory is $GetMaxMemory. Min Memory is $GetMinMemory"
                return $false
            }
        }
        "Present"
        {      
       
             If ($DynamicAlloc)
             {
                 if ($GetMaxMemory  -eq 2147483647)
                 {
                     New-VerboseMessage -Message "Current Max Memory is $GetMaxMemory. Min Memory is $GetMinMemory"
                     return $false
                 }
                 else 
                 {
                     New-VerboseMessage -Message "Current Max Memory is $GetMaxMemory. Min Memory is $GetMinMemory"
                     return $true
                 }
             }
             else
             {
                 If(($MinMemory -ge 0 -and $MinMemory -ne $GetMinMemory) -or $MaxMemory -ne $GetMaxMemory)
                 {
                    New-VerboseMessage -Message "Current Max Memory is $GetMaxMemory. Min Memory is $GetMinMemory"
                    return $false
                 }
                 else
                 {
                    New-VerboseMessage -Message "Current Max Memory is $GetMaxMemory. Min Memory is $GetMinMemory"
                    return $true
                 }
             }
        }
    }
}


Export-ModuleMember -Function *-TargetResource