Category: SQL Server

SQL Server function to return the “Xrd” day of a month and year.

USE [Tools]
GO
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
-- select dbo.XrdDay(4,'thursday', 'november', 2018)	-- Thanksgiving
-- select dbo.XrdDay(4,'thursday', 'november', 2019)	-- Thanksgiving
-- select dbo.XrdDay(4,'thursday', 'november', 2020)	-- Thanksgiving

-- Must have the day of week and the name of month spelled correctly.
alter function [dbo].[XrdDay](
	@xrd int				--3rd, 4th, 5th, etc.
	,@dayname varchar(8)	--'saturday'
	,@month varchar(10)		--'february'
	,@year smallint			--year
)
returns date
as 
begin
	-- declare @xrd int = 3; declare @dayname varchar(8) = 'monday'; declare @month varchar(10) = 'september'; declare @year smallint = 2019;

	declare @Result date=  @month + ' ' + convert(varchar(64),(@xrd*7) - 6) + ',' + convert(varchar(64), @year);	-- get Sunday.
	--select @Result, datename(weekday, @Result);

	--I'm fairly sure this is inefficient, but I can't seem to recall of another way around it.
	--to make it better, we need to calc @sunday+int==dayname in one go, not this while loop.
	while datename(weekday, @Result) collate SQL_Latin1_General_CP1_CI_AS != @dayname set @Result = dateadd( day, 1, @Result );
	--select @Result, datename(weekday, @Result);

	return @Result;
end;
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Agent Alerts Not Configured – Brent Ozar Unlimited®

Here is Brent Ozar’s script to add important alerts: via Agent Alerts Not Configured – Brent Ozar Unlimited®

The below script sets up SQL Server Agent alerts for severity 16 through 25 as well as specific alerts for 823, 824 and 825 errors.  Do a search & replace in this code and change ‘The DBA Team’ to the name of your SQL Agent operator – and remember, always use email distribution lists for your operator emails, not individual peoples’ emails.  Someday – not soon, but someday – you’re going to go on vacation, and you want other people to get notified when you’re gone.

USE [msdb]
GO
EXEC msdb.dbo.sp_add_alert @name=N’Severity 016′,
@message_id=0,
@severity=16,
@enabled=1,
@delay_between_responses=60,
@include_event_description_in=1,
@job_id=N’00000000-0000-0000-0000-000000000000′;
GO
EXEC msdb.dbo.sp_add_notification @alert_name=N’Severity 016′, @operator_name=N’The DBA Team’, @notification_method = 7;
GO
EXEC msdb.dbo.sp_add_alert @name=N’Severity 017′,
@message_id=0,
@severity=17,
@enabled=1,
@delay_between_responses=60,
@include_event_description_in=1,
@job_id=N’00000000-0000-0000-0000-000000000000′;
GO
EXEC msdb.dbo.sp_add_notification @alert_name=N’Severity 017′, @operator_name=N’The DBA Team’, @notification_method = 7;
GO
EXEC msdb.dbo.sp_add_alert @name=N’Severity 018′,
@message_id=0,
@severity=18,
@enabled=1,
@delay_between_responses=60,
@include_event_description_in=1,
@job_id=N’00000000-0000-0000-0000-000000000000′;
GO
EXEC msdb.dbo.sp_add_notification @alert_name=N’Severity 018′, @operator_name=N’The DBA Team’, @notification_method = 7;
GO
EXEC msdb.dbo.sp_add_alert @name=N’Severity 019′,
@message_id=0,
@severity=19,
@enabled=1,
@delay_between_responses=60,
@include_event_description_in=1,
@job_id=N’00000000-0000-0000-0000-000000000000′;
GO
EXEC msdb.dbo.sp_add_notification @alert_name=N’Severity 019′, @operator_name=N’The DBA Team’, @notification_method = 7;
GO
EXEC msdb.dbo.sp_add_alert @name=N’Severity 020′,
@message_id=0,
@severity=20,
@enabled=1,
@delay_between_responses=60,
@include_event_description_in=1,
@job_id=N’00000000-0000-0000-0000-000000000000′;
GO
EXEC msdb.dbo.sp_add_notification @alert_name=N’Severity 020′, @operator_name=N’The DBA Team’, @notification_method = 7;
GO
EXEC msdb.dbo.sp_add_alert @name=N’Severity 021′,
@message_id=0,
@severity=21,
@enabled=1,
@delay_between_responses=60,
@include_event_description_in=1,
@job_id=N’00000000-0000-0000-0000-000000000000′;
GO
EXEC msdb.dbo.sp_add_notification @alert_name=N’Severity 021′, @operator_name=N’The DBA Team’, @notification_method = 7;
GO
EXEC msdb.dbo.sp_add_alert @name=N’Severity 022′,
@message_id=0,
@severity=22,
@enabled=1,
@delay_between_responses=60,
@include_event_description_in=1,
@job_id=N’00000000-0000-0000-0000-000000000000′;
GO
EXEC msdb.dbo.sp_add_notification @alert_name=N’Severity 022′, @operator_name=N’The DBA Team’, @notification_method = 7;
GO
EXEC msdb.dbo.sp_add_alert @name=N’Severity 023′,
@message_id=0,
@severity=23,
@enabled=1,
@delay_between_responses=60,
@include_event_description_in=1,
@job_id=N’00000000-0000-0000-0000-000000000000′;
GO
EXEC msdb.dbo.sp_add_notification @alert_name=N’Severity 023′, @operator_name=N’The DBA Team’, @notification_method = 7;
GO
EXEC msdb.dbo.sp_add_alert @name=N’Severity 024′,
@message_id=0,
@severity=24,
@enabled=1,
@delay_between_responses=60,
@include_event_description_in=1,
@job_id=N’00000000-0000-0000-0000-000000000000′;
GO
EXEC msdb.dbo.sp_add_notification @alert_name=N’Severity 024′, @operator_name=N’The DBA Team’, @notification_method = 7;
GO
EXEC msdb.dbo.sp_add_alert @name=N’Severity 025′,
@message_id=0,
@severity=25,
@enabled=1,
@delay_between_responses=60,
@include_event_description_in=1,
@job_id=N’00000000-0000-0000-0000-000000000000′;
GO
EXEC msdb.dbo.sp_add_notification @alert_name=N’Severity 025′, @operator_name=N’The DBA Team’, @notification_method = 7;
GO
EXEC msdb.dbo.sp_add_alert @name=N’Error Number 823′,
@message_id=823,
@severity=0,
@enabled=1,
@delay_between_responses=60,
@include_event_description_in=1,
@job_id=N’00000000-0000-0000-0000-000000000000′
GO
EXEC msdb.dbo.sp_add_notification @alert_name=N’Error Number 823′, @operator_name=N’The DBA Team’, @notification_method = 7;
GO
EXEC msdb.dbo.sp_add_alert @name=N’Error Number 824′,
@message_id=824,
@severity=0,
@enabled=1,
@delay_between_responses=60,
@include_event_description_in=1,
@job_id=N’00000000-0000-0000-0000-000000000000′
GO
EXEC msdb.dbo.sp_add_notification @alert_name=N’Error Number 824′, @operator_name=N’The DBA Team’, @notification_method = 7;
GO
EXEC msdb.dbo.sp_add_alert @name=N’Error Number 825′,
@message_id=825,
@severity=0,
@enabled=1,
@delay_between_responses=60,
@include_event_description_in=1,
@job_id=N’00000000-0000-0000-0000-000000000000′
GO
EXEC msdb.dbo.sp_add_notification @alert_name=N’Error Number 825′, @operator_name=N’The DBA Team’, @notification_method = 7;
GO

SQL Server: Date and Time Data Types (Size and Ranges)

hnrsj

Thank you for this reference, whomever made this chart!

Tip: DateTime2(3) has the same number of digits as DateTime but uses 7 bytes of storage instead of 8 bytes (SQLHINTS- DateTime Vs DateTime2).

SQL Server: What is Data Warehousing?

A data warehouse is the main repository of a company’s historical data.

Data warehouses can contain a variety of data that presents a coherent picture of the business’s conditions at a point in time.

The main factor of using a data warehouse is that analysts can perform complex queries (data mining) on the information without slowing down the production database servers.

TempDB Best Practices

TempDB Best Practices

  1. TempDB should have as many data files as there are cores available to SQL Server, but only up to 8 data files. Too many TempDB data files can cause contention. Recommendation: Create 8 files and test from there on.
  2. TempDB should only have 1 log file. Extra log files will improve performance as they are written to sequentially.
  3. The data files for TempDB should all be the same size.
  4. TempDB data files and TempDB log files should be on separate disks.
  5. TempDB files should be on the fastest disks.