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11 March 2010 22:07

Coding standards

This post will be about coding standards. There are countless articles and blog posts related to this topic, so I know this post will not be too revealing. Yet I would like to mention a few things I came across during my work with the T-SQL code. Naming...
Posted by Piotr Rodak | 3 comment(s)
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27 January 2010 22:33

relative query cost not accurate when using set rowcount

When tuning performance of a query, it is quite common to compare different variants of the query in the same batch and compare the execution plans to see if changes that you made actually work for better or not. Often you would compare just relative...
Posted by Piotr Rodak | 1 comment(s)
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13 January 2010 21:54

updating column with a random value

I have been working recently on load testing of our ETL. One of the factors that determines amount of transfered data is a lookup table that is joined to the source. I populated this table with aproppriate values, and then realized that I also need some...
Posted by Piotr Rodak | 1 comment(s)
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04 January 2010 22:10

updlock, holdlock and deadlocks

We have a process that manages sliding window over a number of tables in our reporting database. This process is triggered by first call to our reporting ETL. There is table that contains two dates that are important for the partitioning and business...
Posted by Piotr Rodak | 1 comment(s)
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22 November 2009 22:02

DATA ACCESS setting on local server

When you look at the sys.servers catalog view, you will see list of linked servers defined on the server plus one additional row for the server itself. You can distinguish the local server from linked servers by column server_id, which in case of local...
Posted by Piotr Rodak | 4 comment(s)
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24 October 2009 13:35

Makesafe script - set up security for developers

I worked yesterday on a script that is supposed to run on DEV database after it has been restored from production. This script adjusts configuration data and security in the database so developers can work safely on production data without compromising...
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10 October 2009 22:45

DISABLE TRIGGER not captured, SSIS

This post was to be about behavior of SSIS when they insert rows to tables with triggers on them. We had an issue with one of our packs that began to fail 'all of a sudden'. But when I began writing this post and building test SSIS project and...
Posted by Piotr Rodak | 1 comment(s)
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24 September 2009 22:12

on update cascade...

When you define a foreign key constraint, you can also decide what SQL Server should do when primary key to which the constraint references to gets deleted or updated. While I always knew and imagined that ON DELETE CASCADE may be useful, I wondered,...
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20 July 2009 00:13

Sql release builder

For a number of weeks, we have been regularly releasing code to our UAT database. The release process of database code differs slightly from releasing binary code because the release has to take into account existing data and schema in the database. With...
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17 May 2009 00:49

BCP and numeric data field with scientific notation

There is a known issue in SQL Server 2005 with importing data using bcp.exe or BULK INSERT methods from character files that contain numeric values written using scientific notation, like 2.044E10. It was not a problem in versions prior to 2005 because...
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08 April 2009 21:18

MARS - does anyone use it?

I read recently about MARS - Multiple Active Result Sets, functionality that came with SQL Server 2005. I tried to find some 'real life' example of using MARS. Most of the resources I found showed examples on AdventureWorks database and they were...
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26 March 2009 16:58

Generate Create Database Snapshot script

This post is about yet another way of skinning a cat. Recently I 'discovered' usefulness of database snapshots. I find them extremely useful for testing environments, where it is important to be able to revert to initial state of environment in...
Posted by Piotr Rodak | 2 comment(s)
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14 December 2007 23:25

changing collation of all columns without dropping them

Just this week I had opportunity to change collation of all objects using it in a database without dropping it. I like to computers to do what computers should do - work that is :). So I created a query that gave me script changing collation of all columns...
Posted by Piotr Rodak | 1 comment(s)
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24 November 2007 23:42

csv list of elements as parameter for stored procedure

A while ago, Tony Rogerson showed a way how to pass a list of integers (csv) to stored procedure. Approach of creating a script and executing it is OK for smaller amounts of data. I thought, that maybe, as xml is a form of text after all, it would be...
Posted by Piotr Rodak | 1 comment(s)
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