Archive for the ‘SQL Server’ Category

Sql Server useful commands


Categories: SQL, SQL Server Tags: ,

Performance Tuning in SSIS for Denodo ADO Net Source

Assumption: You have Denodo driver installed on server. (I had used “DenodoODBC Unicode” version, when I created User DSN)

Below steps helped me import two million rows (6 columns with mostly int data) data in less than 4 minutes. Earlier it used to take more than one and half hour.

Here trick is to change User DSN settings. :):):)

  • Click “Start” and type-in c:\Windows\SysWOW64\odbcad32.exe and hit enter in Search Programs and File to open “ODBC Data Source Administrator”
  • In “ODBC Data Source Administrator”, in “User DSN” tab select appropriate Data source from “User Data Sources” list. Click “Configure”.
  • Above step will open “ODBS Driver setup” window, Click “Datasource” button
  • do below changes in “Advanced Options” window
    1. on Page 1
      1. in “Data Type Options”, un-select “Text as LongVarchar”
      2. in Miscellaneous, change “Chunk Size” from 100 to 75000
    2. on Page 3
      1. in “The Use of LIBPQ library”, change selection from “unspecified” to ”yes” , click Apply, Click Ok.

I hope this helps.


Logging by Triggers in SQL Server

We can alternatively use SQL Server feature CDC (Change Data Capture), but here I am providing one more way of doing it (custom solution).

Db Objects: (two tables and two triggers)

  1. TargetTableName: Table whose data we want to log
  2. LogTableName: Table where data will be logged. This table structure will be same as TargetTableName, and additionally this table will have three extra columns namely
    • [log_action_type]
    • [log_action_date]
    • [log_action_user]
    • [log_action_hostname]
  3. tl_TargetTableName: Trigger to log DML changes (Update and Delete only)
  4. tu_LogTableName: Trigger to avoid Delete or Update operations operations on logging table
use dbname

alter table LogTableName add [log_action_type] 	[char](1) not null;
alter table LogTableName add [log_action_date] 	[datetime] not null default getdate();
alter table LogTableName add [log_action_user] 	[varchar](50) null;
alter table LogTableName add [log_action_hostname] 	[varchar](50) default host_name();


IF OBJECT_ID ('dbo.tu_LogTableName ','TR') IS NOT NULL
   DROP TRIGGER dbo.tu_LogTableName;
-- =============================================
-- Author:		Umesh Patil	
-- Create date: 2014/08/26
-- Description:	Restirct Delete or Update operations operations on logging table
-- =============================================
CREATE TRIGGER dbo.tu_LogTableName  
   ON  dbo.LogTableName 
	RAISERROR ('Can not perform Delete or Update operations on UserTableName table, either disable/delete the trigger',16,1);

use dbname

IF OBJECT_ID ('dbo.tl_TargetTableName','TR') IS NOT NULL
   DROP TRIGGER dbo.tl_TargetTableName;
-- =============================================
-- Author:		Umesh Patil	
-- Create date: 2014/08/26
-- Description:	Log DML changes (Update and Delete only)
-- =============================================
CREATE TRIGGER dbo.tl_TargetTableName 
   ON  dbo.TargetTableName
	DECLARE @ActionType char(1)

			IF EXISTS(SELECT 1 FROM inserted)
				SET @ActionType='U'
				SET @ActionType='D'

	IF  @ActionType='U' OR  @ActionType='D'
		INSERT INTO [dbo].[TargetTableName]
		  --include all columns
			--include all columns
			,@ActionType as [log_action_type]
			,getdate() as [log_action_date]
			,suser_sname() as [log_action_user]
			,host_name() as [log_action_hostname]
		from deleted
Categories: SQL, SQL Server, T-SQL Tags: , ,

PowerShell for Copy Database

March 25, 2013 13 comments

This is PowerShell tutorial script to understand how to copy existing database with PowerShell and SMO. We will be using Transfer Class from SMO. If you wish to just generate the copy script then there is an option to just script out the transfer using the ScriptTransfer method. When we are ready to bring the data and schema over, we can use the TransferData method. Read more…

SQL Sever – PowerShell for Executing a SQL Query on Multiple Servers

March 14, 2013 13 comments

This is 50th Article on and we are getting great response from the community. This article will be covering how to use PowerShell and SMO to connect multiple SQL Server instances and execute a pre defined SQL command against all of them. This is applicable when we have same database available on multiple SQL Server Instances where you want to execute same SQL query. We are going to use the Invoke-Sqlcmd cmdlet to achieve our mission. Read more…

PowerShell tutorial Part 1- Poweshell for Creating View

March 10, 2013 5 comments

Powershell Tutorial Part 1 – Powershell for Creating View

This article I’ll explain how to create SQL Server View using PowerShell and SMO. This PowerShell Script is compatible with PowerShell V3.0.

I’ll be using Production.ProductCategory, Production.ProductSubCategory and Production.Product tables to create view. Following t-SQL script is equivalent script which we will write in PowerShell later. Read more…

PowerShell for Execute SQL Query

March 10, 2013 5 comments

Invoke-Sqlcmd cmdlet which is all-purpose SQL utility cmdlet being used in PowerShell. As the name suggests, Invoke-Sqlcmd cmdlet allows you to run T-SQL code or scripts and commands supported by the SQLCMD utility. It also allows you to run XQuery code. In this article, we will be looking at two ways of using Invoke-Sqlcmd. Read more…

PowerShell for Droping Database

March 5, 2013 9 comments

This article will help you to understand how we can drop existing SQL Server Database with the help of SMO and PowerShell V3.0. If you do not have you sample data base created then follow the steps to create your database with PowerShell V3.0. Read more…

PowerShell for Altering Database Properties

March 5, 2013 29 comments

This article will help to understand how to alter databases properties using PowerShell V3.0 and SMO. In previous article we seen PowerShell for Creating a Database. Basically we can alter database options from Automatic, Containment, Cursor, File Stream, Miscellaneous, Recovery, Service Broker and State Categories. Read more…

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