Performance Tuning with SQL Server Dynamic Management Views

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Assessing transaction log impact .................................................................................146 Snapshot Isolation and the tempdb Version Store .........................................................148 SNAPSHOT and READ_COMMITTED_SNAPSHOT modes ..............................149 Investigating snapshot isolation ...................................................................................151 Summary ................................................................................................................................170 Chapter 5: Indexing Strategy and Maintenance ........................172 The Indexing System Catalog Views ................................................................................. 173 Using the Indexing DMOs .................................................................................................. 178 Index Strategy ....................................................................................................................... 178 Investigating index usage (index_usage_stats) .........................................................182 Determine usage patterns of current indexes (index_operational_stats) ........... 190 Find missing indexes..................................................................................................... 199 Index Maintenance (index_physical_stats) ..................................................................... 207 A brief overview of index fragmentation ..................................................................208 Fragmentation statistics (index_physical_stats) .......................................................210 Detecting and fixing fragmentation ............................................................................212 Summary ................................................................................................................................ 215 Chapter 6: Physical Disk Statistics and Utilization ..................217 Minimizing I/O ..................................................................................................................... 218 Tuning the Disk I/O Subsystem ......................................................................................... 221 Getting Physical Statistics on your Tables and Indexes .................................................222 Size and structure ...........................................................................................................223 Investigating fragmentation ........................................................................................ 230 Diagnosing I/O Bottlenecks ...............................................................................................239 An overview of sys.dm_io_virtual_file_stats ............................................................240 Using sys.dm_io_virtual_file_stats .............................................................................241 Investigating physical I/O and I/O stalls ....................................................................243 Viewing pending I/O requests .................................................................................... 247 Finding the Read:Write Ratio............................................................................................ 249 Amount of data read versus written ........................................................................... 251 Number of read and write operations ........................................................................ 253 Number of reads and writes at the table level ...........................................................254
Getting Stats about tempdb Usage ....................................................................................257 Summary ............................................................................................................................... 260 Chapter 7: OS and Hardware Interaction ...................................262 Wait Statistics .......................................................................................................................263 A brief overview of sys.dm_os_wait_stats .................................................................265 Finding the most common waits ................................................................................ 267 Finding the longest cumulative waits ........................................................................ 270 Investigating locking waits ...........................................................................................271 Investigating CPU pressure ..........................................................................................273 SQL Server Performance Counters ...................................................................................274 Directly usable counter types .......................................................................................277 Ratios ...............................................................................................................................280 Per second averages........................................................................................................283 Average number of operations .................................................................................... 286 Monitoring Machine Characteristics ............................................................................... 288 Investigating CPU Usage .....................................................................................................292 An overview of sys.dm_os_schedulers .......................................................................293 CPU waits ....................................................................................................................... 295 Insufficient threads ....................................................................................................... 297 Context switching ......................................................................................................... 297 Is NUMA enabled? ........................................................................................................299 CPU utilization history ................................................................................................300 Investigating Memory Usage .............................................................................................. 301 System-wide memory use .............................................................................................303 Process memory use ......................................................................................................305 Memory use in the buffer pool .................................................................................... 306 Memory clerks and memory grants ........................................................................... 308 Investigate memory using cache counters .................................................................310 Investigating Latching ..........................................................................................................315 Summary ................................................................................................................................ 319
Page 1 and 2: High Performance SQL Server Perform
Page 3 and 4: Copyright Louis Davidson and Tim Fo
Page 5: Dissecting user activity ..........
Page 9 and 10: Server (PASS) since 2002. He has al
Page 11 and 12: Tim Ford I dedicate this book to Am
Page 13 and 14: 13 Introduction on those objects th
Page 15 and 16: Code Examples 15 Introduction Throu
Page 17 and 18: Chapter 1: Using Dynamic Management
Page 21 and 22: DMO Security and Permissions Chapte
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• dbcc shrinkdatabase / shrinkfil
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This will return (with a different
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Who is running what, right now? Cha
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Summary Chapter 2: Connections, Ses
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SELECT TOP 10 object_id , name FROM
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Dissecting the SQL text 83 Chapter
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Figure 3.2: Three queries returned
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Criteria in determing plan reuse 91
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For a server that had been up for t
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Listing 3.9: Investigating the most
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SELECT FirstName , LastName FROM db
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Listing 3.14: Finding the CPU-inten
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WHERE execText.text like '%account%
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Snapshot isolation level 119 Chapte
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Lock types 123 Chapter 4: Transacti
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INNER JOIN sys.dm_tran_session_tran
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SELECT SD.[name] , SD.snapshot_isol
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FROM dbo.Culture ; -- COMMIT; Listi
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Using sys.dm_tran_version_store 165
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sys.dm_tran_top_version_generators
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Chapter 5: Indexing Strategy and Ma
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High selectivity Chapter 5: Indexin
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Identify inefficient indexes Chapte
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Listing 5.9: Retrieving locking and
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Missing index groups Chapter 5: Ind
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Listing 5.13: Finding beneficial mi
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ORDER BY ddips.[avg_fragmentation_i
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Summary Chapter 5: Indexing Strateg
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Chapter 6: Physical Disk Statistics
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Tuning the Disk I/O Subsystem Chapt
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The view returns the statistical co
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The sys.dm_db_index_physical_stats
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The NEWSEQUENTIALID() function Chap
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CREATE TABLE testHeap ( testHeapId
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Viewing pending I/O requests Chapte
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Amount of data read versus written
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The results are as follows: Chapter
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Finding the most common waits 267 C
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WHERE cntr_type = @PERF_COUNTER_LAR
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DECLARE @PERF_LARGE_RAW_FRACTION IN
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ORDER BY dopc_fraction.object_name
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) time DATETIME DEFAULT ( GETDATE()
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DECLARE @PERF_AVERAGE_BULK INT , @P
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• cpu_count - number of logical p
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The max worker threads option. 293
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• work_queue_count - number of ta
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WHERE scheduler_id < 255 AND runnab
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System-wide memory use 303 Chapter
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Summary 319 Chapter 7: OS and Hardw
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Index A ACID test 116 Activity and
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P Performance counters 277-291 aver
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sys.dm_tran_database_transactions 1
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SQL Compare ® Pro Compare and sync
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Deployment Manager Automated deploy
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SQL Monitor from $795 SQL Server pe
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You can buy our acclaimed SQL Serve
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.NET Reflector Decompile, debug, an
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The Red Gate Guides SQL Server Back
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