What’s New in SQL Server 2012
Engine and Tools
Aaron Bertrand
SQL Sentry, Inc.
October 11-14, Seattle, WA
Who is Aaron Bertrand?
• Senior Consultant at SQL Sentry
www.sqlsentry.net
abertrand@sqlsentry.net
• Microsoft MVP since 1997-98
• Blog: www.sqlblog.com
• Twitter: @AaronBertrand
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Overview
• Changes to setup, engine and tools
• Will not be covering BI features
• Some features NDA or subject to change
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Setup
• New prerequisites:
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PowerShell 2.0, “no-reboot” package
Simpler slipstream process
Server Core supported
32-bit still supported (for now)
No longer supported:
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AWE, Itanium, cluster on WoW
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Books Online
• Revamped content organization
• Several usability enhancements:
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Utility to switch local/online preferences
Better content updating experience
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Availability
AlwaysOn
• Availability groups: databases as a unit
• Read-only secondaries
• Compression, encryption, FILESTREAM
• Requires WSFC
Flexible Failover Policy
• Based on error conditions, severity,
responsiveness
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Availability
Multi-Subnet Clustering
• Geographically dispersed failover
• Requires common domain + Win2008 R2
Local Drive Flexibility
• Use more accessible SSD drives for TempDB
• Mount points can be on local disk
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Manageability
Contained Databases
• Isolate parts of a database that are serveror tempdb-dependent
• Provide alternatives to support containment
• Identify potential issues via new DMV/XE
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Manageability
FileTable
• FileTable managed by SQL using Win32 API
• Can run set-based DML against files/folders
• SQL detects external changes
Startup options now easier to configure
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Security
Custom Server Roles
• Separation of duties at server level
• New DDL; sp_*role* procedures deprecated
HASHBYTES()
• Supports SHA2_256/512; still limited to 8K
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Programmability
Management Studio
• Port to VS shell:
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Multi-monitor support
Zoom
Powerful region editing
Snippets, Surround With
IntelliSense improvements
Clipboard cycle
Debugging enhancements
More restore options
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Programmability
SQL Server Data Tools (“Juneau”)
• More integrated Visual Studio experience
• “Reveal Codes”-style table designer
• Sandbox development / debugging
• Build/deploy can target 2005+, Azure
• Smart refactor/delete, easier CLR deploy
• Not a full replacement for “Data Dude”
or Management Studio
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Juneau – Table Designer
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Programmability
Metadata Discovery
• New procedures/DMVs to inspect resultsets
• Replaces SET FMTONLY ON
• Automatically used by ODBC / OLEDB
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Programmability
EXECUTE … WITH RESULT SETS
• Define a “contract” for shape of result
• Rename redundant columns, force types
• Allow apps to adjust to schema changes at
different rates
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Programmability
OFFSET / FETCH
• Works like MySQL’s LIMIT, but ANSI standard
• Performance difference negligible
SEQUENCE
• Central IDENTITY mechanism (like Oracle)
• Performs better than IDENTITY
• Same transaction limitations
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Programmability
THROW
• Raise custom errors without sys.messages
• Can use in CATCH or outside
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Outside, severity is always 16
• Some RAISERROR functionality is missing
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Programmability
Windowing Enhancements
• Moving average, median, other aggs
based on surrounding rows (“framing”)
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LAG/LEAD, FIRST_VALUE/LAST_VALUE
CUME_DIST(), PERCENT_RANK(), PERCENTILE_CONT()
Can also use WITHIN GROUP / DATEDIFF
Much faster running totals, moving sums, etc.
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Programmability
IIF()
• This is just syntactic sugar around CASE
CHOOSE()
CONCAT()
• Not a group concat function!
EOMONTH()
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Programmability
Date/Time Constructors
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DATEFROMPARTS
TIMEFROMPARTS
DATETIMEFROMPARTS
SMALLDATETIMEFROMPARTS
DATETIME2FROMPARTS
DATETIMEOFFSETFROMPARTS
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Programmability
TRY_CONVERT()
FORMAT()
PARSE()
TRY_PARSE()
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Programmability
FORCESEEK enhancements
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Can now specify index/columns
New FORCESCAN hint
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For obscure scenarios where you want a scan
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Programmability
Full-Text Search
• Property searching for Office 2007+ docs
• Customizable proximity term (NEAR / ~)
• Semantic Search
Log()
• Now takes optional base argument, e.g.
SELECT LOG(32, 2);
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Performance
Column-based storage (“Apollo”)
• Stores columns together on pages
• Best for star joins, aggregates
• Not so good for unions, outer joins
• Many limitations in Denali
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Performance
New Online Operations
• Index rebuild with LOB
• Add column with default
Underlying performance enhancements
• FILESTREAM, Full-Text Search
• Memory manager enhancements
• 2008/R2 fixes ported forward
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Performance
Resource Governor
• More resource pools (64 vs. 20)
• Scheduler / NUMA node affinity
• Real CPU capping
• More memory control
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Troubleshooting
Extended Events Investments
• New profiler-like session viewer
• New handling for service broker,
checkpoint, memory, disk
New DMOs / system procedures
• dm_os_volume_stats, dm_os_windows_info
• dm_server_registry, dm_server_services
• sys.sp_server_diagnostics
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Testing / Troubleshooting
Distributed Replay Utility
• Easily replay traces from multiple servers
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Up to 16 servers x 255 threads
With or without real-time synchronization
• More realistic simulation of workloads
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What’s Being deprecated?
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DATABASEPROPERTY()
osql.exe, sqlmaint.exe, SQL Mail, SQL-DMO
SQL Server 2000 (80) compatibility
OLEDB provider for SQL Server
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Resources
http://bit.ly/AB-SQL2012
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Thank you
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2011 PASS Summit in Seattle
October 11-14, Seattle, WA
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