Why you should(n't) run your databases in the cloud
WINDOWS AZURE PLATFORM Compute: Virtualized compute environment based on Windows Server Storage: Durable, scalable, & available storage Management: Automated, model-driven management of the service Database: Relational processing for structured/unstructured data Service Bus: General purpose application bus Access Control: Rules-driven, claims-based access control
THE SQL PLATFORM TO CLOUD Symmetric Programming Model Data Hub Aggregation Initial Services Database – Core SQL Server database capabilities Future Services Data Sync – Enables the sync framework (soon after PDC) Additional SQL Server capabilities available as a service: Business Intelligence and Reporting New services: Reference Data and Secure Data Hub
MICROSOFT SQL AZURE Clear Feedback: “I want a database in the Cloud” Familiar SQL Server relational model Uses existing APIs & tools Friction free provisioning and reduced management Built for the Cloud with availability and scale Accessible to all from PHP, Ruby, and Java Focus on combining the best features of SQL Server running at scale with low friction
ARCHITECTURE Shared infrastructure at SQL database and below Request routing, security and isolation Scalable HA technology provides the glue Automatic replication and failover Provisioning, metering and billing infrastructure SDS Provisioning (databases, accounts, roles, …, Metering, and Billing Machine 4 Machine 5 Machine 6 SQL Instance SQL Instance SQL InstanceUser SQL DB User User User User SQL DB User User User User SQL DB User User UserDB1 DB2 DB3 DB4 DB1 DB2 DB3 DB4 DB1 DB2 DB3 DB4 Scalability and Availability: Fabric, Failover, Replication, and Load balancing Scalability and Availability: Fabric, Failover, Replication, and Load balancing
SQL AZUREDEPLOYMENT Web Portal (API) DB SQL AzureScript TDS
SQL AZURE ACCESSING DATABASES Web Portal (API) Your SQL Azure TDS AppChange Connection String
DATABASE REPLICAS Replica 1 Replica DB 2 Replica 3
SQL AZURE DATABASE FEDERATIONSFederations are objects that allow scaling-out of data for building datatier applications with unlimited scalability and best price-performancethrough amplifying backend elasticity and simplified multi-tenancy atthe database tier. - Unlimited Scalability - Dynamic and Online Elasticity - Simplified Multi-Tenancy
EFFICIENT TENANCY MODELS Classic Tenancy Model On Premise Single-Tenant-Per-Database Cloud Tenancy Models Single-database-per-tenant does not work for long tail and large tenants Utilize multiple-tenants-per-database and multiple-databases-per-tenant as well for full flexibilityTenancy Models: Single tenant per database Multiple-tenants per database Multiple databases per tenant
PROGRAMMING MODEL Small Data Sets Use a single database Same model as on premise SQL Server Large Data Sets and/or Massive Throughput Partition data across many databases Use parallel fan-out queries to fetch the data Application code must be partition aware in v1 For v1 will publish best practices for scale out Post-v1 we are looking at building an abstraction to hide some of the complexities of partitioning
LOGICAL VS. PHYSICAL ADMINISTRATION SQL Azure focus on logical administration Schema creation and management Query optimization Security management (Logins, Users, Roles) Service handles physical management Automatically replicated with HA “out of box” Transparent failover in case of failure Load balancing of data to ensure SLA DBA role places more focus on logical management
DEPLOYMENT Support for basic deployment options SQL scripts work (but not attach database) Geo-location of Windows Azure compute and SQL Azure Databases Support for Application and multi-server management model Support for application packages Cloud or on-premise is a deployment time choice Visibility of data across on-premise and the cloud Support existing and new forms of deployment
SECURITY MODEL Uses regular SQL security model Authenticate logins, map to users and roles Authorize users and roles to SQL objects Limited to standard SQL Auth logins Username + password Future AD Federation, WLID, etc as alternate authentication protocolsSecurity model is 100% compatible with on-premise SQL
PRICING Standard pay-as-you-go (Business Edition) pricing Standard pay-as-you-go (Web edition) pricing $99.99 per database up to 10GB per month $199.98 per database up to 20GB per month $9.99 per database up to 1GB per month $299.97 per database up to 30GB per month $399.96 per database up to 40GB per month $49.95 per database up to 5GB per month $499.95 per database up to 50GB per monthDatabases can be either Web or Business Edition databases.Web Edition databases supports up to 5 GB of data, and uses billing increments of 1GB and 5GB.Business Edition database will support up to 50 GB, and uses 10 GB billing increments.Billed based on the peak database size in a day, rolled up to the next billing increment.
AZURE GAP’S Does not support user-defined common language runtime (CLR) data types. Some Transact-SQL statements do not support some of the arguments and options that exist in their corresponding Transact-SQL statements in SQL Server 2008 http://msdn.microsoft.com/en-us/library/ee336267.aspx Soes not support all of the Transact-SQL statements that are delivered in SQL Server 2008. http://msdn.microsoft.com/en-us/library/ee336253.aspx
IMPORTANT BIG GAPS The USE statement does not switch between databases. To change databases, you must directly connect to the database. SQL Azure Database does not support heap tables. A clustered index must be created before an insert operation is allowed on the table. SQL Azure Indexes do not support : partition_schema_name,filegroups, FILESTREAM, TEXTIMAGE, PAD_INDEX, FILLFACTOR, SORT_IN_TEMPDB, ALLOW_ROW_LOCKS, ALLOW_PAGE_LOCKS, MAXDOP,DATA_COMRESSION
GUIDELINES & LIMITATIONS I Starting with Visual Studio 2010, you can use the Server Explorer to connect to and to explore your databases in SQL Azure. Previous versions of Server Explorer are not supported. Visual Studio 2010 is fully supported. SQL Azure Database does not support SQL Server Agent or jobs. You can, however, run SQL Server Agent on your on- premise SQL Server and connect to SQL Azure Database. Both the READ_COMMITTED_SNAPSHOT and ALLOW_SNAPSHOT_ISOLATION database options are set to ON. Because SET <snapshot_option> in the ALTER DATABASE Transact-SQL statement is not supported, these database options cannot be changed.
GUIDELINES & LIMITATIONS II Default database collation is SQL_LATIN1_GENERAL_CP1_CI_AS, where LATIN1_GENERAL is English (United States), CP1 is code page 1252, CI is case-insensitive, and AS is accent-sensitive. SQL Azure Database does not allow setting the collation at the server or database level. SQL Azure Database supports up to 150 databases in each SQL Azure server, including the master database. MAXSIZE is specified when the database is first created and can later be changed using ALTER DATABASE. MAXSIZE If you remove some data then there can be as much as a fifteen-minute delay before you can insert new data.
SQL AZURE DATA SYNC (CTP)Data management capabilities allowing data sharingbetween SQL Azure and on-premises databases. Extend enterprise data to the cloud, rather than replacing it, by synchronizing on-premises SQL Server with SQL Azure Synchronize data between SQL Azure databases within a data center, to help scale-out data access across multiple databases for elastic demand and usage spikes Synchronize data between SQL Azure databases in different data centers, to extend data and provide geo- available data access
TOP FEATURES SQL AZURE DATA SYNC Elastic Scale: Service scales as resources requirements grow No-Code Sync Configuration: Easily define data to be synchronized with easy to use tools Schedule Sync: Choose how often data is synchronized Conflict Handling: Handle issues where same data is changed in multiple locations Logging and Monitoring: Administration capabilities for tracking data and monitoring potential issues Data sub-setting: Control of tables to be synchronized between SQL Azure database
THE FACTS Industry evidence suggests that shifting to the cloud saves 20%-50% off current IT deployments, and, according to its advocates, it can be many times more than that. Switching costs to cloud computing are relatively low. It is even possible to run existing systems parallel to cloud computing, which makes migration easier. Too few practical examples. Suppliers ahead of the game are not releasing examples of what works and what doesnt Higher savings are available from newer cloud solutions, but they have not been considered as departments look to shave costs on old technology and existing contracts.
PERSONAL OPINION – CONSOLIDATE Private vs. Public Cloud Private cloud != (virtualized) local environments in your data center Private cloud is taking the concepts of Public Cloud and making those concepts viable in your own data centers. elastic scale metered billing self-provisioning consolidated servers maximum utilization of infrastructure etc.
VIRTUALIZE =! PRIVATE CLOUDBUT SHOULD BE SEEN AS A PART OF IT Customers should virtualize SQL Server Start from smallest workload Continue to larger workload over time with experience Microsoft support SQL Server virtualization http://support.microsoft.com/?id=956893 Customers should not virtualize SQL Server CPU: Need more than 4 logical processors Memory: Need more than 64 GB per virtual machine Check Troughput
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