V4BstS

Transcription

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3 V4BstS

4 Work with SQL from Version 2000 OLTP/ BI Database Design and Code Review Performance Tuning HA/DR Plan Design Upgrade/ Migration/ Consolidation Capacity Planning Health Check

5 Overview Processing Performance Query Performance

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9 Different engine Different purpose Different mindset Different language(s) Same product box Same tuning methods

10 Client Application MDX Query Requests Session Management Parser XML AST XML/A Listener Session Manager Security Manager Log Manager Memory Manager Metadata Manager Execution Discover Discover Executor DDL Stmt Executor Thread Pools Process Query Statements Command Parser AST Coordinator Scheduler Formula Engine Job Tree Execution Plan Data Retrieval Storage Engine Storage Engine Cache Data Cache Cache Dim Cache Dimension Data Attribute Store Hierarchy Store MG Data Fact Data Aggregations

11 Process dimensions Process Data Process Indexes MDX Queries

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13 SQL Server Profiler Trace Dynamic Management View SQL Server Best Practice Analyzer BIDS - Best practice warnings Management Data Warehouse MDX Studio

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15 Lock Name Value Usage Read 2 Read lock, shared Reading metadata objects Write 4 Write lock, exclusive For create, alter and update operations Prevent concurrent transactions from taking Read or Write locks on the object at the same time Commit_Read 8 Commit lock, shared Block write operations - Query operations - Processing - Calculate user permissions Commit_Write 16 Commit lock, exclusive Prevent access to that object while it is being updated - Processing - Commit transactions for DDL in database level - Update master version map in server level

16 Locks during dimension processing Deadlock Locks during partition processing

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18 Star Schema Index design Partition Data compression Connection to data source: isolation level, query timeout, # of connection, packet size

19 Object Process Type

20 Dimension Processing Adding, changing or removing dimension members

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22 Include only those columns in dimension which are required by the business Define attribute relationships or cascading attribute relationships Specify the appropriate attribute relationship type Turn Off the Attribute Hierarchy and Use Member Properties Appropriately set KeyColumns property Setting AttributeHierarchyOptimizedState property to Not Optimized Creating user defined hierarchies AttributeHierarchyVisible property of an attribute

23 Cluster Index

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27 Performance counter name MSAS :Memory\Memory Limit Low KB MSAS :Memory\Memory Limit High KB MSAS :Memory\Memory Usage KB MSAS :Memory\Cleaner Memory nonshrinkable KB MSAS :Memory\Cleaner Memory shrinkable KB Definition Displays Memory\LowMemoryLimit Displays Memory\TotalMemoryLimit Displays the memory usage of the server process. This is the value that is compared to Memory\LowMemoryLimit and Memory\TotalMemoryLimit. Displays the amount of memory, in KB, non subject to purging by the background cleaner. Displays the amount of memory, in KB, subject to purging by the background cleaner.

28 Slow Cleaning 100% 90% Hard Memory Limit 85% 75% (Total Physical + High Limit)/2 High Memory Limit (TotalMemoryLimit) Kill all sessions Throw out all shrinkable Low Memory Limit High Memory Price No Cleaning Mid Memory Price (middle of low & high) Faster Cleaning 0

29 Situation Processing pool job queue length > 0 and Processing pool idle threads = 0 for longer periods during processing. Both Processing pool job queue length > 0 and Processing pool idle threads > 0 at same time during processing. Action Increase Threadpool\Process\MaxThreads and retest. Decrease CoordinatorExecutionMode and retest.

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33 MDX Query In Cache Query Subcube Requests Cache Disk Cellset Out Formula Engine works out what data is needed for each query, and requests it from the Storage Engine Storage Engine handles retrieval of raw data from disk, and any aggregation required

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41 r2-performance-guide.aspx

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