SQL Server 2012 AlwaysOn and SQLSentry
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SQL Server 2012 AlwaysOn and SQLSentry Kevin Kline • Director of Engineering Services, SQL Sentry • SQL Server MVP since 2004 • Twitter, FB, LI: KEKline • Blog: http://KevinEKline.com , http://ForITPros.com
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SQL Server 2012 AlwaysOn and SQLSentry. Kevin Kline Director of Engineering Services, SQL Sentry SQL Server MVP since 2004 Twitter, FB, LI: KEKline Blog: http://KevinEKline.com , http://ForITPros.com. Agenda. The Basics. Inherits from DBM: Sync / Async data protection - PowerPoint PPT Presentation
Transcript of SQL Server 2012 AlwaysOn and SQLSentry
SQL Server 2012 AlwaysOn and SQLSentry
Kevin Kline• Director of Engineering Services, SQL Sentry• SQL Server MVP since 2004• Twitter, FB, LI: KEKline• Blog: http://KevinEKline.com, http://ForITPros.com
SQLSentry.net
Agenda
The Basics of
AlwaysOn
SSMS Tooling Demo
SQLSentry Tooling Demo
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The Basics
• Database-level protection• Built upon the foundation of database mirroring• Requires a Windows Server Failover Cluster.• Availability Groups (AGs) are what most people
mean when they say “AlwaysOn”
Inherits from DBM:• Sync / Async data
protection• Automatic or
manual failover• Automatic page
repair• Compressed data
stream• TCP endpoints
With WSFC:• Does NOT require
instances to be Failover Cluster Instances (FCIs)
• Does NOT require that servers start out as clustered if using standalone instances
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What Does WSFC Mean for a DBA?• You need to know WSFC very thoroughly.• Quorum matters.• Nodes must be part of the same domain. (Different
subnets are ok).• Quorum matters.• WSFC validation is very important.
• AG feature doesn’t check like in setup for FCI• It’s on YOU to check it.• %windir%/Cluster/Reports• Apply hotfixes per Windows version
• Quorum matters.
SQLSentry.net
I Know Mirroring. How’s This Different?
• Enterprise Edition only. DB in full recovery mode only.• Not a 1:1 ratio of principals to mirrors. Per AG:
• Up to 4 additional replicas, for a total of 5• Up to 3 synchronous replicas• Up to 2 automatic failover pairs
• Multiple DBs in an AG will failover at the same time.***• Easily span subnets.• Replicas usable for read-only access and backups.
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Availability Groups Fundamentals
o
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Flexible Failover Policy LevelsFailure Condition Level
On server down. This is the least restrictive level. 1
On server unresponsive. 2
On critical server error. The default level. (1 and 2, plus internal errors).
3
On moderate server error. (1 – 3, plus other errors like stack dumps). 4
On any qualified failure conditions. (1 – 4, plus other errors like worker thread exhaustion and unresolvable deadlocks).
5
Damaged databases and suspect databases?Nope, not detected by any failure-condition level.
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AG Metadata
• SSMS (in demo)• DMVs:
• sys.availability_*• sys.dm_hadr_*
• Xevents• SP_server_diagnostics: checks the health_check_timeout
value in 30 second intervals, by default.
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Additional Resources
• Plan Explorer Free: http://sqlsentry.net/plan-explorer/sql-server-query-view.asp
• Twitter and #SQLHelp
• SQLCAT.com• SQLSkills.com• Community Sites:
• SQLPASS.org• SQLServerCentral.com• SQLBlog.com• SQLTeam.com
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SUMMARY
SSMS, Traces, and Execution PlansTest Harness & TestingQuery Tuning TipsTemp tables
Cursors & LoopsNULLError HandlingTransactions
Security isn’t an afterthoughtChange Management is risk management
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Q & A
• Send questions to me at: [email protected] • Twitter, Facebook, LinkedIn at KEKline• Slides at http://KevinEKline.com/Slides/ • IT Leadership content at http://ForITPros.com
• THANK YOU!
