DBI314

Machine 5 SQL Instance SQL DB User DB1 User DB2 User DB3 User DB4 SQL Azure Gateway Service Machine 6 SQL Instance SQL DB User DB1 User DB2 User DB3 User DB4 Machine 4 SQL Instance SQL DB User DB1 User DB2 User DB3 User DB4 Scalability and Availability: Fabric, Failover, Replication, and Load balancing Logical Server

Regional hosting locations 200ms Latency from 2 regional hosting locations South Central US North Central US North Europe Southeast Asia West Europe Hosting locations within 100ms of the customer At least one hosting location can be reached within 100ms, but not two No points to test from or greater than 200ms latency East Asia

SQL Azure

Blog Post: Testing Client Latency to SQL AzureTesting Client Latency to SQL Azure aspx SQL Azure

Throttling Impact = Code % 4 If remainder is 0: No throttling 1: Reject Update/Insert 2: Reject All Writes 3: Reject all Step 1: Reasons = Code/256 = 512 Step 2: Convert Reasons to binary 512 => (2) Step 3: Group in sets of 2 digits from right to left: 10|00|00|00|00 (2) Throttling Type 1000 Resource Code Why am I throttled? How bad is it? Code =

Solution: Yes. Load balancer moves A or B away from this machine Throttling Trigger: B Throttling Victim: B Fairness: Fair to throttle B - B uses more CPU than A - B triggered throttling on the machine

Solution: Yes. Load balancer moves A or B away from this machine Throttling Trigger: B Throttling Victim: A Fairness: Not quite fair to throttle A - B triggered throttling on the machine

Solution: No. A will get throttle anywhere it is placed. A exceeds a machine’s total CPU Throttling Trigger: A Throttling Victim: A Fairness: Fair from system perspective but customer will not be happy =( Customer A needs to optimize and reduce resource usage to fit within a SQL Azure machine

select sum(reserved_page_count)*8.0/1024 AS [Storage_in_MB] from sys.dm_db_partition_stats

select highest_cpu_queries.total_worker_time, q.text AS [Query_Text], highest_cpu_queries.plan_handle from (select top 50 qs.plan_handle, qs.total_worker_time from sys.dm_exec_query_stats qs order by qs.total_worker_time desc) as highest_cpu_queries cross apply sys.dm_exec_sql_text(plan_handle) as q order by highest_cpu_queries.total_worker_time desc

select top 25 (total_logical_reads/execution_count) as avg_logical_reads, (total_logical_writes/execution_count) as avg_logical_writes, (total_physical_reads/execution_count) as avg_phys_reads, Execution_count, sql_handle, plan_handle from sys.dm_exec_query_stats order by (total_logical_reads + total_logical_writes) Desc

Required Slide Speakers, please list the Breakout Sessions, Interactive Discussions, Labs, Demo Stations and Certification Exam that relate to your session. Also indicate when they can find you staffing in the TLC. DBI Building Scalable Database Solutions Using Microsoft SQL Azure Database Federations

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