Spark the future.

Martin Cairney

Hybrid data platform – making the most of Azure plus your on-prem kit

DAT341B

Martin CairneyMicrosoft Data Platform MVP Microsoft Certified Trainer

Organiser – SQL Saturday Melbourne (http://bit.ly/1Mz9Lye)

@martin_cairney

http://au.linkedin.com/in/martincairney

martin.cairney@lobsterpot.com.au

Agenda

Hybrid Solutions with SQL Server 2016Cloud-based AlwaysOn Availability Group Replicas

Stretch Databases

Enhanced Backups to the Cloud

Better consistency in working with SQL Server on-premises, SQL Server on Azure Virtual Machines, and Azure SQL DB means that these solutions can all appear as transparent to your applications.

Hybrid Solutions – AlwaysOn Avaiulability Groups

Cloud-Based AlwaysOn Availability Group Replica

Common On-Premise HA/DR Scenarios:

Less Redundan

cy

• Highly redundant storage on SAN

• Clustering

• vMotion / Live Migration to move VM to another host

More Redundan

cy

• AlwaysOn Availability Groups

Cloud-Based AlwaysOn Availability Group Replica

Primary Site

Remote Site

Primary Replica

Secondary Replica

Secondary Replica

Listener

SQL Server 2012 and later

Multi-Site ClusterMultiple Secondaries but only 1 synchronousListener routes the connections

Primary Site

Primary Replica

Secondary Replica

Secondary Replica

Listener

SQL Server 2016

Extend to Azure Multiple Secondaries: up to 3 synchronousLoad-balanced asynchronous secondariesBasic (2 nodes) for Std EditionListener routes the connections

Azure

Cloud-Based AlwaysOn AvailabilityGroup Replica

As easy as …

1. Ensure your primary is running on a cluster2. Run the wizard3. Enjoy your secondary in Azure

Full HA/DR in Azure Simplified

On Premise Azure

Primary Secondary Forwarder Secondary

Distributed AG

Hybrid Solutions – Stretch Database

Issues with large DB or tablesTables are becoming massive because:

Users want to keep their data forever

Cold data in the tables – accessed infrequently but must be online

Maintenance challenges – backups / DBCC

Stretch DatabasesAllows the movement of entire tables or identified rows and/or columns to be moved to Azure SQL DB

CTP3 limited to moving entire tablesPost-CTP3 release will allow selection of rows/columns based on a predicate

Limitations (as at CTP 3)

Unique / Primary Key constraints not enforcedUPDATE / DELETE operations not permittedALTER TABLE not permitted (other than to set MIGRATION_STATE)Indexed Views cannot reference a stretch table

Stretch DatabasesEligibility Restrictions:

Data types: timestamp sql_variant XML geometry / geography hierarchyid UDTs

Column types: computed columns COLUMN_SET

Constraints: FK constraints that reference the table DEFAULT constraints CHECK constraints

Indexes: XML indexes Full Text indexes Spatial indexes

Table properties: Max 1023 columns Less than 998 indexes FILESTREAM data File Tables Replication CDC or Change Tracking Memory-Optimised

Stretch Databases

Stretching a Table to Azure

Martin Cairney

Hybrid Solutions – Backups in Azure

Enhanced Backups to AzureAzure backup options:

SQL Server 2012

• Backup to Azure blob storage

• Backup to Windows Azure Tool

SQL Server 2014

• URL selectable in SSMS dialog box

• Managed Backup to Windows Azure

SQL Server 2016

• Block blobs can be used to stripe backups

• Snapshots for data files on Azure blob storage

• Enhanced Managed Backup to Windows Azure

Enhanced Backups to AzureBackup to block blobs

Previous versions could only specify a single page blob (max size 1 TB)

Block size is variable up to 4 MB and each block blob can contain up to 50,000 blocks (max block blob size = 195 GB)

Can stripe the backup over multiple files – improving throughput and size of the backup (effectively unlimited)

Requires a Shared Access Signature for the Azure Storage Account (used to create a SQL Credential)

Enhanced Backups to AzureFile-Snapshot Backups

Requires the database files to be hosted on Azure Storage

The .bak file doesn’t contain the data – pointers to the corresponding snapshots

Backup must be to same storage account as the database files use

Enhanced Backups to Azure

File-Snapshot Backups - Mechanism

From MSDN

Azure based backups

Martin Cairney

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