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Presenter: Red Devilic
Sponsored by SQLViet.com
22/12/2013
SQL SERVER CONFERENCE HCMC 2013
DATABASE TUNING PERFORMANCE OVERVIEW
CONTENT• Why - When tuning DB Performance
• Diffirent approaches for Tuning Performance
• Server Tuning
• Instance Tuning
• Objects Tuning
• SQLs Tuning
• Q & A
WHY – WHEN TUNING DB PERFORMANCE • Why
• Increasing performance
• Saving resources
• Reducing risks
• When
• Developing
• Maintaining
• Having problems
DIFFIRENT APPROACHES• Solving Problems and releavant components from user
feedbacks.
• Based on alert log
• From DBA advices
• Follow Tuning Performance Process
DIFFIRENT APPROACHES ©
• Tuning Performance Process
• Server
• Instance
• Object
• SQL Statements
SERVER TUNING• Disk
• CPU
• RAM
• Network
INSTANCE TUNING
• Instance vs Database
• Instance Tuning
• Processes
• Memory
• Buffer Cache
• Query Cache
INSTANCE TUNING ©
• Buffer Cache
• Buffer Cache Hit Ratio
INSTANCE TUNING ©
• Query Cache
• Kind of requests
• Dynamic SQL
• Stored Procedure, Funtion
• CLR
• …
INSTANCE TUNING ©
• ExampleSELECT * FROM dbo.Tblxxx WHERE col1 = 1;
SELECT * FROM dbo.Tblxxx WHERE col1 = 2;
• Parameterized Query
• Dynamic Query
• SP_EXECUTESQL
• Rewrite using Stored Procedure
INSTANCE TUNING ©• Dynamic Condition
• SELECT * FROM tbl WHERE @condition
• Using WHERE 1 = 1• SELECT * FROM tbl WHERE @condition
WHERE (CustomerID = @custid OR @custid IS NULL)
AND (DepartmentID = @depid OR @depid IS NULL)
• Dynamic List• SELECT * FROM tbl WHERE col IN (@list)
• SELECT * FROM tbl
WHERE col IN
(SELECT col FROM TableFromList(@list))
OBJECTS TUNING• Tuning Object
• Database Structure
• Object Parameter
• Objects
• Physical Object
• Data File
• Logical Object
• Table
• Index
OBJECTS TUNING ©• Physical Object
• Multi Data Files
• Separate Data File for Table, Index
• Reducing auto extent Data File
• Logical Object
• FILLFACTOR
• Kind of Index, Table
OBJECTS TUNING ©
• Database Structure
• Dernormalization
• Vertical Partitioning
• Horizontal Partitioning
• Aggregation Queries
SQL’S TUNING
SQL’S TUNING ©• Identify bad queries
SQL’S TUNING ©
• Automatic
• SQL Tuning Advisor
• 3rd Software
• Manual
SQL’S TUNING ©• Change Access Methods
• Rewrite WHERE to use Indexes
• COMPUTED Column
• FBI Index
• Change Index Type
• Selectivity
• Order
• Lookup Operation
SQL’S TUNING ©• Change Access Methods
• Rewrite WHERE to use Indexes
• COMPUTED Column
• FBI Index
• Change Index Type
• Selectivity
• Order
• Lookup Operation
SQL’S TUNING ©
SQL’S TUNING ©
SQL’S TUNING ©
• Change Join Type
• Reduce Order Operators
• ORDER BY
• DISTINCT
• GROUP BY
MY APPROACHES• Existing System
• SQL Tuning
• Object Tuning
• Instance Tuning
• Server Tuning
MY APPROACHES ©• New System
• Server Tuning
• Instance Tuning
• Object Tuning
• SQL Tuning
Q & A
THANK YOU