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SQL Server 2012 Performance tuning
Michelle Gutzait [email protected]
Blog: http://michelle-gutzait.spaces.live.com/default.aspx
- Database Tuning advisor (DTA) Enhancements
- Column store indexes
- Online index operations
New in SQL 2012
Servers
Applications
Users
WEB
Users
Server is too slow Something is broken
Application crashes Weird behavior Timeouts
Heavy process
Windows Performance Monitor
SQL Server Profiler &
SQL Traces
ReadTrace
SQL Server Management Studio
Windows Management Instrumentation
(WMI)
Database Engine Tuning Advisor
DMVs and statistics
SQL Server 2008 Activity Monitor
SQL Server 2008 and R2 Ent tools…
PSSDiag
SQLDiag and PerfStats
Performance Analysis of Logs
(PAL)
SQL Nexus
Performance
Dashboard
3-rd party tool
The search engine…
So also… SCRIPT REPOSITORIES
Index and T-SQL
Analysis with
DMVs
SQL Server 2005/2008 Index analysis - Database Tuning Advisor
Significant enhancement
Reads/writes (IO)
Large IO
Index design
Index and disk fragmentation
Query design
Heavy user activity
Disk Contention
Memory constraints
Large indexes and tables
Network contention
Blocks/locks/deadlocks
Index / Data
Page =
8K
All
columns of
the index
key are in
one row
Minimizing
IO
Traditional index ColumnStore
Optimized for star schema design
Data Compression
Batch Execution Mode
Segment Elimination
Data Compression Compress and store data in memory with Vertipaq™
technology
High compression for repetitive values
Batch Execution Mode
Batch vs. Row Mode
Batch = around 1000 rows
Vector-based structure in-memory
Processed all at once
Up to 40 times CPU reduction
Optimized with large memory and multicores
DOP >= 2
Segment Elimination
Indexes are partitioned into segments
Clustering
Database
mirroring
Log
Shipping
Disk mirroring
Replication Database
Snapshots
3-rd party
solutions
Always ON
Integrity checks
Update Stats
Backups
Index
maintenance Clean History
Data archive
Patching
Upgrades/move
An
available
running
database
CREATE INDEX
ALTER INDEX
DROP INDEX
ALTER TABLE
(UNIQUE/PRIMARY
keys)
Large Value Type column *VAR*(MAX)
PRINT @@VERSION
go
-- Create a Table
CREATE TABLE Items
(
ItemID INT IDENTITY,
ItemName VARCHAR(100),
VarcharData VARCHAR(max)
)
go
-- Create an Index
CREATE NONCLUSTERED INDEX
[IDX_ItemIdxTest]
ON [dbo].[Items] ( [ItemID] ASC,
[ItemName] ASC )
include ( [VarcharData] )
WITH ( ONLINE = ON )
go
SQL < 2012
Always On
Increased number of partitions (15,000 vs. 1000)
Indirect checkpoints for database recovery time
Geographically dispersed Clustering
New in SQL 2012
And more…
