201203 - Session 1 TITLE: Anything SQL: Lightning Talks SPEAKER: Various Speakers

1. Lightning Talks

2. GogulaAryalingam Business Intelligence
01
Navantis

4. Thank you
My data-mart is better thanyour data warehouse

5. ShihamSamsudeen T-SQL
02
Zone 24x7

6. TRY… CATCH…Alien?
• Your Code in the TRY block
• Check for the Errors in the CATCH block
Can be found in
Modern Programming Languages

7. TRY… CATCH…T-SQLStyle
• Your SQLStatement 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.

8. Why your codeFAILED?
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

9. NEED to see some T-SQL
Nice Result
Check out what
being selected
out?

10. What can we do with this ?
I will Hold Error
Info
I will Fill the
Error Info

11. Error Occurs…
Recording
Error Info
Take Out the
Error Info.
Results!
Error 1
Error 2
Error 3

12. Information isWealth!
 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
 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!

13. Thank you
Try… Catch…

14. SusanthaBathige T-SQL
03
Pearson Lanka

15. Thank you
ParameterSniffing

16. SudeshWijayatilake
PerformanceTuning
04
Finlays Colombo PLC

17. The Feature
• The DataCompression featureof SQL Server, can reduce
thestorage footprint of your databases.
– Often, datacompression mayleadto degrade inCPU
performance duetocompress/decompress;
• However,SQLServer2008datacompressionsimply storesdatamore
efficiently intherowsandpages,which meansthatthein-memory
storageandIOOperations datamanagementisefficient.

18. Mainly 2 Types ofCompression
• SQLServer 2008supports2specifictypesofdata compressionmethods:
– Row Compression
• lower level whichstoresthe fixed characterstrings by using variable-lengthformat bynot
storingthe blankcharacters.NULLand 0 values acrossalldatatypes areoptimized and take
no bytes.
– Page Compression
• Is Higherlevel compressing & uses twotypes of compression
– Prefix-Prefixcompressionworkson common values patternacross all rowson thepage
– Dictionary - Workson exactvaluesmatchpatternacrossallpages.

19. Considerations
• Datacompressvery well:
– Columnswith numericor fixed-length characterdata types wheremost valuesdon’t requireall the
allocated bytes: For example, integers wheremost values are less than1000
– Null-ablecolumns wherea significant numberof the rows havea NULLvalue for the column
– Significant amounts of repeating data values orrepeating prefixvalues in the data
• Somepatternsof datathatdonotbenefitmuch fromcompressionare:
– Columnswith numericor fixed-length characterdata typeswheremost values requireall the bytes
allocated for the specific data type
– Not muchrepeating data
– Repeating data with non-repeatingprefixes
– Data stored out of the row
– FILESTREAMdata
• Compression is Version dependant [Cannot be decompressed on another version]

20. ImplementData 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 theDataCompression Wizard.

21. 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.SalesOrderDetail
REBUILD WITH (DATA_COMPRESSION = ROW);
–OR
ALTER TABLE [Sales].[SalesOrderDetail] REBUILD PARTITION = ALL
WITH (DATA_COMPRESSION = PAGE)

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

23. Boltof Lightening

24. Queriesand ShareYour Findings
• Pleaseemailme
Sudesh.wijayatilaka@yahoo.com
–OR uploadto ourSQL Server Universe site
http://www.sqlserveruniverse.com/ forums

25. Thank you
DataCompression

26. SupunThrikawala PerformanceTuning
05
CAMManagement Solutions

27. Thank you
Table variables, the good and thebad

28. AvanthaSiriwardana General
06
CAMManagement Solutions

29. Thank you
SQL Server Standards