anything sql: lightning talks

Anything-SQL

Lightning Talks

My data-mart is better than your data warehouseGogula Aryalingam Business Intelligence

01

Navantis

Thank you

My data-mart is better than your data warehouse

TRY… CATCH…

Shiham Samsudeen T-SQL

02

Zone 24x7

TRY… CATCH… Alien ?

• Your Code in the TRY block• Check for the Errors in the CATCH block

Can be found in Modern Programming Languages

TRY… CATCH…T-SQL Style

• Your SQL Statement in the TRY block• Check for the Errors in the CATCH block

Find it in Transact-SQL

sql_statement: any Transact-SQL statement

statement_block : any group of Transact-SQL statements

in a batch or enclosed in a BEGIN…END block.

Why your code FAILED?List of SQL Server functions to identify:

ERROR_NUMBER() returns the number of the error

ERROR_SEVERITY() returns the severity of the error

ERROR_STATE() returns the error state number

ERROR_PROCEDURE() returns the name of the stored procedure or trigger where the error occurred, this will be NULL if you run an ad-hoc SQL statement

ERROR_LINE() returns the line number inside the routine that caused the error

ERROR_MESSAGE() returns the complete text of the error message. The text includes the values supplied for any substitutable parameters, such as lengths, object names, or times

NEED to see some T-SQL

Nice Result

Check out what being selected

out?

What can we do with this ?

I will Hold Error Info

I will Fill the Error Info

Error Occurs…Recording Error Info

Take Out the Error Info.

Results!

Error 1

Error 2

Error 3

Information is Wealth! the ability to log all errors plus any other information you want to capture like

user name, host name etc with 1 Stored Proc that you can call from everywhere

Take Home with You,

the ability to do anything with the logged

data Once YOU have it.

I CAN NOT do ANYTHING on SOMETHING until I have that THING!

Thank you

Try… Catch…

Parameter Sniffing

Susantha Bathige T-SQL

03

Pearson Lanka

Thank you

Parameter Sniffing

Data Compression

Sudesh Wijayatilake Performance Tuning

04

Finlays Colombo PLC

The Feature• The Data Compression feature of

SQL Server, can reduce the storage footprint of your databases.

– Often, data compression may lead to degrade in CPU performance due to compress/decompress; • However, SQL Server 2008 data

compression simply stores data more efficiently in the rows and pages, which means that the in-memory storage and IO Operations data management is efficient.

Mainly 2 Types of Compression

• SQL Server 2008 supports 2 specific types of data compression methods:– Row Compression

• lower level which stores the fixed character strings by using variable-length format by not storing the blank characters. NULL and 0 values across all data types are optimized and take no bytes.

– Page Compression• Is Higher level compressing & uses two types of compression

– Prefix - Prefix compression works on common values pattern across all rows on the page

– Dictionary -  Works on exact values match pattern across all pages.

Considerations• Data compress very well:

– Columns with numeric or fixed-length character data types where most values don’t require all the allocated bytes: For example, integers where most values are less than 1000

– Null-able columns where a significant number of the rows have a NULL value for the column

– Significant amounts of repeating data values or repeating prefix values in the data

• Some patterns of data that do not benefit much from compression are:

– Columns with numeric or fixed-length character data types where most values require all the bytes allocated for the specific data type

– Not much repeating data– Repeating data with non-repeating prefixes– Data stored out of the row– FILESTREAM data

• Compression is Version dependant [Cannot be decompressed on another version]

Implement Data compression

• You can implement both types of data compression when you create a table or index, or by altering existing tables and indexes. You can do this by using Transact-SQL code or the Data Compression Wizard.

USE [AdventureWorks] Go

/*Estimating how much space can be saved by row or page*/EXEC sp_estimate_data_compression_savings 'Sales', 'SalesOrderDetail', NULL, NULL,'ROW' ;Go

EXEC sp_estimate_data_compression_savings 'Sales', 'SalesOrderDetail', NULL,NULL, 'PAGE' ;GO---------------------------------------------------------------------------------------------------------------/*Enabling Table compression by row or page */ALTER TABLE Sales.SalesOrderDetailREBUILD WITH (DATA_COMPRESSION = ROW); –OR

ALTER TABLE [Sales].[SalesOrderDetail] REBUILD PARTITION = ALLWITH (DATA_COMPRESSION = PAGE)

Referred from

http://msdn.microsoft.com/en-us/library/dd894051(v=sql.100).aspx

Bolt of Lightening

Queries and Share Your Findings

• Please email me Sudesh.wijayatilaka@yahoo.com

–OR upload to our SQL Server Universe sitehttp://www.sqlserveruniverse.com/ forums

Thank you

Data Compression

Table Variables, The good and the bad

Supun Thrikawala Performance Tuning

05

CAM Management Solutions

Thank you

Table variables, the good and the bad

SQL Server Standards

Avantha Siriwardana General

06

CAM Management Solutions

Thank you

SQL Server Standards