Performance Tuning with SQL Server Dynamic Management Views

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Chapter 7: OS and Hardware Interaction When memory utilization is just right, the value will be "Physical memory state is steady." For short periods, you may very occasionally see a third value of "Physical memory state is transitioning," indicating that the memory state is changing from high to low, or vice versa. Using these five columns, as shown in Listing 7.22, we can get an overview of how much RAM is available to the operating system in total, and how much of it is currently not in use. The first and second values correspond to the Task Manager Physical Memory (MB) values for total and available memory. SELECT total_physical_memory_kb / 1024 AS total_physical_memory_mb , available_physical_memory_kb / 1024 AS available_physical_memory_mb , total_page_file_kb / 1024 AS total_page_file_mb , available_page_file_kb / 1024 AS available_page_file_mb , system_memory_state_desc FROM sys.dm_os_sys_memory Listing 7.22: System memory usage. The following results were taken from my writing laptop with just under 2 GB of RAM (some allocated to video RAM). total_physical_memory_mb available_physical_memory_mb total_page_file_kb ------------------------ ---------------------------- -------------------- 1912 912 3825 available_page_file_kb system_memory_state_desc ---------------------- --------------------------------- 2265 Available physical memory is high 304
305 Chapter 7: OS and Hardware Interaction This DMV also provides additional columns to get information about the memory assigned to the system cache and the kernel if, for some reason, you need to determine these individual values. Process memory use Also, for SQL Server 2008, there is another DMV pertaining to memory, sys.dm_os_ process_memory, which returns a single row summarizing memory usage from the point of view of the SQL Server process. This DMV has the following columns (and more), all of which give you the current status of memory on the server: • physical_memory_in_use_kb – all physical memory in use on the server by the SQL Server processes, in kilobytes • virtual_address_space_committed_kb – amount of virtual address space committed to the SQL Server process • virtual_address_space_available_kb – amount of virtual address space that is committed but not currently in use • page_fault_count – number of times data needed was not found in process memory, causing a physical read to disk • process_physical_memory_low – when the SQL Server process is needing more RAM than is physically available, this value is set to 1 • process_virtual_memory_low – when the SQL Server process is needing more virtual RAM than is currently available, this value is set to 1.
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High Performance SQL Server Perform
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Copyright Louis Davidson and Tim Fo
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Dissecting user activity ..........
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Getting Stats about tempdb Usage ..
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Server (PASS) since 2002. He has al
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Tim Ford I dedicate this book to Am
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13 Introduction on those objects th
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Code Examples 15 Introduction Throu
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Chapter 1: Using Dynamic Management
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DMO Security and Permissions Chapte
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We can find out, for example: Chapt
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Beware of the watcher effect Chapte
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Chapter 2: Connections, Sessions an
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Sysprocesses versus DMOs Chapter 2:
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Listing 2.3: Who is connected? Chap
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Listing 2.4: Who is executing what
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Logins with more than one session C
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DECLARE @days_old SMALLINT SELECT @
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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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73 Chapter 3: Query Plan Metadata P
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75 Chapter 3: Query Plan Metadata P
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77 Chapter 3: Query Plan Metadata t
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79 Chapter 3: Query Plan Metadata U
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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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87 Chapter 3: Query Plan Metadata T
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89 Chapter 3: Query Plan Metadata
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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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99 Chapter 3: Query Plan Metadata C
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Listing 3.14: Finding the CPU-inten
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WHERE execText.text like '%account%
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115 Chapter 4: Transactions We'll a
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117 Chapter 4: Transactions unique
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Snapshot isolation level 119 Chapte
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121 Chapter 4: Transactions • res
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Lock types 123 Chapter 4: Transacti
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127 Chapter 4: Transactions SELECT
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129 Chapter 4: Transactions If, fro
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131 Chapter 4: Transactions The LEF
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133 Chapter 4: Transactions When in
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135 Chapter 4: Transactions column.
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137 Chapter 4: Transactions some po
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139 Chapter 4: Transactions OPENTRA
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141 Chapter 4: Transactions In this
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143 Chapter 4: Transactions time on
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145 Chapter 4: Transactions process
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INNER JOIN sys.dm_tran_session_tran
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149 Chapter 4: Transactions Any DML
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SELECT SD.[name] , SD.snapshot_isol
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153 Chapter 4: Transactions In othe
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157 Chapter 4: Transactions Open a
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FROM dbo.Culture ; -- COMMIT; Listi
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161 Chapter 4: Transactions In orde
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163 Chapter 4: Transactions In shor
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Using sys.dm_tran_version_store 165
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167 Chapter 4: Transactions In List
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sys.dm_tran_top_version_generators
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171 Chapter 4: Transactions Via que
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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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Page 279 and 280: WHERE cntr_type = @PERF_COUNTER_LAR
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Page 331 and 332: SQL Monitor from $795 SQL Server pe
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Page 335 and 336: .NET Reflector Decompile, debug, an
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Performance Tuning with SQL Server Dynamic Management Views

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