Custom Errors Web config

Generic Runtime Error (unknown error with no description or clue of what just happened):

Add the following custom errors element to web.config (inside system.web):

< customErrors mode="Off"/ >

Now more information will be displayed:

Git rewrite history to Github

To remove the last commit from the master branch at Github but "saving" that last commit to a branch named mein-bak

[master]> git checkout -b mein-bak
[mein-bak]> git push origin mein-bak
[mein-bak]> git checkout master
[master]> git reset --hard HEAD~1
[master]> git push --force origin master

Before applying changes this is how master looks at Github:

a-b-c-d-e-f-g [master]

And this is how it looks after applying those changes:

a-b-c-d-e-f [master]
           \
            g [mein-bak]

Run program as different user - runas command

Open a command prompt console and execute the following:

C:\Users\jdoe>runas /user:loremipsum\jsmith notepad

Where loremipsum is the machine's name (or the domain name) and notepad the program you want to execute as jsmith.

The command prompt will ask for jsmith's password and if entered correctly (and if such user has sufficient permissions) the program will be executed/open.

Send email PowerShell

Create a script like the following and save it as send_email.ps1.

$from = New-Object System.Net.Mail.MailAddress "from@domain.com" 

$to = New-Object System.Net.Mail.MailAddress "jdoe@gmail.com" 

$messge = new-object system.Net.Mail.MailMessage $from, $to

$messge.IsBodyHTML = $true
$messge.Subject = "Test email to jdoe"
$messge.body = "Lorem ipsum dolor sit amet. Regards."

$smtpServer = 'localhost'
$port = '25'

$smtp = new-object Net.Mail.SmtpClient($smtpServer, $port)

$smtp.Send($messge);

Open PowerShell, go to the directory where the script was saved and execute it.

If you have permissions to execute scripts in Powershell, and the SMTP server is correctly configured, and the recipient email account exists, then you should get the email.

sp_who and sp_who2 Blocking processes

From
http://stackoverflow.com/questions/2234691/sql-server-filter-output-of-sp-who2 and
http://sqlserverplanet.com/dba/a-better-sp_who2-using-dmvs-sp_who3

With sp_who and sp_who2 we can determine what process is blocking a table for example. We can use the following script to filter out the sp_who2 output:

DECLARE @Table TABLE(
        SPID INT,
        Status VARCHAR(MAX),
        LOGIN VARCHAR(MAX),
        HostName VARCHAR(MAX),
        BlkBy VARCHAR(MAX),
        DBName VARCHAR(MAX),
        Command VARCHAR(MAX),
        CPUTime INT,
        DiskIO INT,
        LastBatch VARCHAR(MAX),
        ProgramName VARCHAR(MAX),
        SPID_1 INT,
        REQUESTID INT
)

INSERT INTO @Table EXEC sp_who2

SELECT  *
FROM    @Table
WHERE ....

Another way is to use a custom sp_who3 sp for this:

CREATE PROCEDURE [dbo].[sp_who3] 

AS
BEGIN

SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED

SELECT
    SPID                = er.session_id
    ,BlkBy              = er.blocking_session_id      
    ,ElapsedMS          = er.total_elapsed_time
    ,CPU                = er.cpu_time
    ,IOReads            = er.logical_reads + er.reads
    ,IOWrites           = er.writes     
    ,Executions         = ec.execution_count  
    ,CommandType        = er.command         
    ,ObjectName         = OBJECT_SCHEMA_NAME(qt.objectid,dbid) + '.' + OBJECT_NAME(qt.objectid, qt.dbid)  
    ,SQLStatement       =
        SUBSTRING
        (
            qt.text,
            er.statement_start_offset/2,
            (CASE WHEN er.statement_end_offset = -1
                THEN LEN(CONVERT(nvarchar(MAX), qt.text)) * 2
                ELSE er.statement_end_offset
                END - er.statement_start_offset)/2
        )        
    ,STATUS             = ses.STATUS
    ,[Login]            = ses.login_name
    ,Host               = ses.host_name
    ,DBName             = DB_Name(er.database_id)
    ,LastWaitType       = er.last_wait_type
    ,StartTime          = er.start_time
    ,Protocol           = con.net_transport
    ,transaction_isolation =
        CASE ses.transaction_isolation_level
            WHEN 0 THEN 'Unspecified'
            WHEN 1 THEN 'Read Uncommitted'
            WHEN 2 THEN 'Read Committed'
            WHEN 3 THEN 'Repeatable'
            WHEN 4 THEN 'Serializable'
            WHEN 5 THEN 'Snapshot'
        END
    ,ConnectionWrites   = con.num_writes
    ,ConnectionReads    = con.num_reads
    ,ClientAddress      = con.client_net_address
    ,Authentication     = con.auth_scheme
FROM sys.dm_exec_requests er
LEFT JOIN sys.dm_exec_sessions ses
ON ses.session_id = er.session_id
LEFT JOIN sys.dm_exec_connections con
ON con.session_id = ses.session_id
CROSS APPLY sys.dm_exec_sql_text(er.sql_handle) AS qt
OUTER APPLY 
(
    SELECT execution_count = MAX(cp.usecounts)
    FROM sys.dm_exec_cached_plans cp
    WHERE cp.plan_handle = er.plan_handle
) ec
ORDER BY
    er.blocking_session_id DESC,
    er.logical_reads + er.reads DESC,
    er.session_id
 
END

SQL Assembly Error

Exception:

An error occurred in the Microsoft .NET Framework while trying to load assembly id 65536. The server may be running out of resources, or the assembly may not be trusted with PERMISSION_SET = EXTERNAL_ACCESS or UNSAFE. Run the query again, or check documentation to see how to solve the assembly trust issues

Possible solution:

sp_configure 'clr enabled', 1
GO
RECONFIGURE
GO

ALTER DATABASE database_name SET TRUSTWORTHY ON 

USE database_name
GO

EXEC sp_changedbowner 'sa'

Create CLR Assembly SQL Function

Create a cs code file with the desired functionality. Example:

using System;
using System.Data;
using Microsoft.SqlServer.Server;
using System.Data.SqlTypes;

public class TimeZoneHelper
{
    [Microsoft.SqlServer.Server.SqlFunction]
    public static DateTime MountainToUtc(DateTime mountainDateTime)
    {
         TimeZoneInfo zone = TimeZoneInfo.FindSystemTimeZoneById("Mountain Standard Time"); // "Mountain Standard Time" it's the ID regardless of daylight saving time (i.e. no matters if right now is daylight saving time, the ID name remains the same)

         DateTime utcTime = TimeZoneInfo.ConvertTimeToUtc(mountainDateTime, zone); // it automatically takes care of daylight saving time

         return utcTime;
    }
      
    [Microsoft.SqlServer.Server.SqlFunction]
    public static DateTime PacificToUtc(DateTime pacificDateTime)
    {
         TimeZoneInfo zone = TimeZoneInfo.FindSystemTimeZoneById("Pacific Standard Time"); // "Pacific Standard Time" it's the ID regardless of daylight saving time (i.e. no matters if right now is daylight saving time, the ID name remains the same)

         DateTime utcTime = TimeZoneInfo.ConvertTimeToUtc(pacificDateTime, zone); // it automatically takes care of daylight saving time

         return utcTime;
    }
}

Save the file as TimeZoneHelper.cs
Open the Visual Studio 2008 Command Prompt (I also tried the 2010 version but it didnt work) and run the following:

csc /target:library C:\Users\jon.connor\Downloads\TimeZoneHelper.cs

This will create a TimeZoneHelper.dll in the same directory where the source file is in.
In SQL Server run the following to enable CLR code to run:

sp_configure 'clr enabled', 1
GO
RECONFIGURE
GO

ALTER DATABASE Northwind SET TRUSTWORTHY ON;
GO

You also have to grant permissions to a SQL Server login:

GRANT UNSAFE ASSEMBLY TO some_user;
GO

Now you can create the assembly in the Northwind database

CREATE ASSEMBLY TimeZoneHelperAssembly 
FROM 'C:\Users\jon.connor\Downloads\TimeZoneHelper.dll' 
WITH PERMISSION_SET = UNSAFE
GO

Finally create functions based on the assembly methods.

CREATE FUNCTION dbo.MountainToUTC(@mountainDateTime datetime) 
RETURNS datetime 
AS EXTERNAL NAME 
[TimeZoneHelperAssembly].[TimeZoneHelper].[MountainToUtc]
GO

CREATE FUNCTION dbo.PacificToUTC(@pacificDateTime datetime) 
RETURNS datetime 
AS EXTERNAL NAME 
[TimeZoneHelperAssembly].[TimeZoneHelper].[PacificToUtc]
GO

And now you can start using these functions as you would normally do:

select dbo.MountainToUTC('2012-04-13 16:00:00'), 
       dbo.PacificToUTC('2012-04-13 16:00:00')

Thanks to http://goo.gl/W4u42