Geek Sync: Performance Monitoring for SQL Server Analysis Services
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Performance Monitoring for SQL Server Analysis Services September 2, 2015
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Transcript of Geek Sync: Performance Monitoring for SQL Server Analysis Services
Performance Monitoring for SQL Server Analysis ServicesSeptember 2, 2015
Performance Metrics
ArchitectureProcessing
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Architecture
Semantic Model
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• 3
Semantic Model 3
• 3
Semantic Model
Tabular Model• Relational Modeling Constructs (tables, relationships)• In-Memory Analytics Engine• Higher Memory Requirements• Greater Compression• On the fly aggregation• Multiple data sources
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• 3
Semantic Model
Multidimensional• OLAP Model Contructs(cubes, dimensions)• Pre-aggregation• Relational Data Sources• Many to Many Relationships• Large data volumes
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Semantic Model
Resources• Comparing Tabular and Mutidimensional Solutions (SSAS)
https://msdn.microsoft.com/en-us/library/hh212940.aspx
•Choosing a Tabular or Multidimensional Modeling Experience in SQL Server 2012
Analysis Services
https://msdn.microsoft.com/en-us/library/hh994774.aspx
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Architecture
Processing
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• 3
Processing
Data Refresh• SSMS or Scripted (XMLA)• Cube processing is memory intensive• Disk I/O • Changes to cube can have big impact on processing• Tabular processing primarily refreshes data
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Processing
DAX Query Processing
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Single Threaded
Multi-threaded
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Processing
MDX Query Processing
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Processing
Query Processing
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• Formula Engine Cache• Flat cache• Calculated Cache
• Storage Engine• Dimension (cube)• Measure Group (cube)• Vertipaq (tabular)
Architecture
Performance Metrics
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Performance Metrics
Sources
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• Dynamic Management Views• https://msdn.microsoft.com/en-us/library/hh230820.aspx
• Performance Counters• https://msdn.microsoft.com/en-us/library/Hh230807.aspx
• PS C:> (Get-Counter -ListSet "MSOLAP*").paths
Performance Metrics
Categories
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• Network• Disk I/O• Memory• CPU• MDX/DAX
Performance Metrics
Network
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• Network Interface: Bytes Received/sec
• Network Interface: Bytes Sent/sec
• Network Interface: Output Queue Length
Performance Metrics
Network
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• Processing: Rows read/sec
• Storage Engine Query: Rows sent/sec
Performance Metrics
Disk I/O
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• Storage Engine Query: Queries from file/sec
• Storage Engine Query: Data bytes/sec
• Physical Disk: Disk Read Bytes/sec
• Cache: Copy Reads/sec
Performance Metrics
Disk I/O
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• Physical Disk: Avg. Disk sec/Read
• Physical Disk: Avg. Disk sec/Write
Performance Metrics
Memory
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• Overall Memory used by SSAS
• SSAS Memory Efficiency
• SSAS Memory Activity
Performance Metrics
Memory Usage
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• Memory: Cleaner Memory KB
• Memory: Cleaner Memory shrinkable KB
• Memory: Cleaner Memory nonshrinkable KB
Performance Metrics
Memory Usage
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• Memory: Memory Limit Low KB
• Memory: Memory Limit High KB
Performance Metrics
Memory Efficiency
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• Calculation cache lookups/sec, hits/sec
• Flat cache lookups/sec, hits/sec
• Dimension cache lookups/sec, hits/sec
• Measure group cache lookups/sec, hits/sec
Performance Metrics
Memory Cache Improvements
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• Configure memory limits appropriately
• Warm the cache
Performance Metrics
CPU
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• Processor: % Processor
• System: Context Switches/sec
• System: Processor Queue Length
Performance Metrics
CPU
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• Threads: Query pool (FE)
• Threads: Processing pool (SE)
Relief:• MaxThreads• CoordinatorExecutionMode
Performance Metrics
Query Processing
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• MDX: Total cells calculated
• MDX: Number of calculation covers
• MDX: Total Sonar subcubes
“Cell by cell” vs. “block oriented”
vs
Performance Metrics
Query Processing
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• MDX: Total recomputes
• MDX: Total NON EMPTY unoptimized
• MDX: Total NON EMPTY for calculated members
Performance Metrics
Query Optimization
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• Proper Aggregations
• Improves query performance
• Use Non-Empty option on MDX queries where possible
• Effective partition strategy
• Improves Storage Engine Performance
Performance Metrics
Cube Processing
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• Processing: Rows written/sec
• Proc Aggregations: Rows created/sec
• Proc Indexes: Rows/sec
Track over time to determine effectiveness or impact of changes to the cube structure.
Email: [email protected]
Twitter: @MSBI_Stan
http://community.idera.com/blog/idera/part-1-monitoring-analysis-servicesssas-performance/
