May 17, 2026, 11:40 PM
This commit is contained in:
Paweł Domański
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--=========================================--
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/*** SQL SERVER MEMORY MONITORING QUERIES ***/
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--=========================================--
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-- Supported Versions SQL server 2008 and higher
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-------------------------------------------------
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----------------------------------
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/*** 1. System Memory Status ***/
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----------------------------------
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SELECT total_physical_memory_kb / 1024 AS
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[Total Physical Memory],
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available_physical_memory_kb / 1024 AS
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[Available Physical Memory],
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total_page_file_kb / 1024 AS
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[Total Page File (MB)],
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available_page_file_kb / 1024 AS
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[Available Page File (MB)],
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100 - ( 100 * Cast(available_physical_memory_kb AS DECIMAL(18, 3)) / Cast
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(
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total_physical_memory_kb AS DECIMAL(18, 3)) ) AS
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'Percentage Used',
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system_memory_state_desc AS
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[Memory State]
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FROM sys.dm_os_sys_memory;
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---------------------------------------
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/*** 2. SQL Server's memory Status ***/
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---------------------------------------
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-- this will show how much memory allocated to SQL Server , Buffer pool commit.
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-- SQL server 2008 and earlier
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SELECT
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(bpool_committed*8)/1024.0 as [Buffer Pool Committed (MB)],
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(bpool_commit_target*8)/1024.0 as [Buffer Pool Committed Targer (MB)]
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FROM sys.dm_os_sys_info;
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-- SQL Server 2012 and later
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SELECT
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(committed_kb)/1024.0 as [Buffer Pool Committed (MB)],
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(committed_target_kb)/1024.0 as [Buffer Pool Committed Targer (MB)]
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FROM sys.dm_os_sys_info;
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----------------------------------------------
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/*** 3. Physical Memory Used By SQL Sever***/
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----------------------------------------------
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-- Find the actual Memory used by SQL Server
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select
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convert(decimal (5,2),physical_memory_in_use_kb/1048576.0) AS 'Physical Memory Used By SQL (GB)',
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convert(decimal (5,2),locked_page_allocations_kb/1048576.0) As 'Locked Page Allocation',
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convert(decimal (5,2),available_commit_limit_kb/1048576.0) AS 'Available Commit Limit (GB)',
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page_fault_count as 'Page Fault Count'
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from sys.dm_os_process_memory;
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------------------------------------------
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/*** 4. Buffer Pool Usage By Databases ***/
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------------------------------------------
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DECLARE @total_buffer INT;
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SELECT @total_buffer = cntr_value
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FROM sys.dm_os_performance_counters
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WHERE RTRIM([object_name]) LIKE '%Buffer Manager'
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AND counter_name = 'Database Pages';
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;WITH DBBuffer AS
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(
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SELECT database_id,
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COUNT_BIG(*) AS db_buffer_pages,
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SUM (CAST ([free_space_in_bytes] AS BIGINT)) / (1024 * 1024) AS [MBEmpty]
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FROM sys.dm_os_buffer_descriptors
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GROUP BY database_id
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)
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SELECT
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CASE [database_id] WHEN 32767 THEN 'Resource DB' ELSE DB_NAME([database_id]) END AS 'DataBase Name',
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db_buffer_pages AS 'DB Buffer Pages',
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db_buffer_pages / 128 AS 'DB Buffer Pages Used (MB)',
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[mbempty] AS 'DB Buffer Pages Free (MB)',
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CONVERT(DECIMAL(6,3), db_buffer_pages * 100.0 / @total_buffer) AS 'DB Buffer Percentage'
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FROM DBBuffer
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ORDER BY [DB Buffer Pages Used (MB)] DESC;
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--------------------------------------------
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/*** 5. Memory Used By Database Objects ***/
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--------------------------------------------
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;WITH obj_buffer
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AS (SELECT [Object] = o.NAME,
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[Type] = o.type_desc,
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[Index] = COALESCE(i.NAME, ''),
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[Index_Type] = i.type_desc,
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p.[object_id],
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p.index_id,
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au.allocation_unit_id
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FROM sys.partitions AS p
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INNER JOIN sys.allocation_units AS au
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ON p.hobt_id = au.container_id
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INNER JOIN sys.objects AS o
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ON p.[object_id] = o.[object_id]
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INNER JOIN sys.indexes AS i
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ON o.[object_id] = i.[object_id]
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AND p.index_id = i.index_id
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WHERE au.[type] IN ( 1, 2, 3 )
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AND o.is_ms_shipped = 0)
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SELECT obj.[object],
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obj.[type],
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obj.[index],
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obj.index_type,
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Count_big(b.page_id) AS 'Buffer Pages',
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Count_big(b.page_id) / 128 AS 'Buffer MB'
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FROM obj_buffer obj
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INNER JOIN sys.dm_os_buffer_descriptors AS b
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ON obj.allocation_unit_id = b.allocation_unit_id
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WHERE b.database_id = Db_id()
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GROUP BY obj.[object],
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obj.[type],
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obj.[index],
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obj.index_type
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ORDER BY [buffer pages] DESC;
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----------------------------------------
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/*** 6. Costliest Stored Procedures ***/
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----------------------------------------
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-- Based on Logical reads
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SELECT TOP(25) p.NAME AS [SP Name],
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qs.total_logical_reads AS
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[TotalLogicalReads],
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qs.total_logical_reads / qs.execution_count AS [AvgLogicalReads],
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qs.execution_count AS 'execution_count',
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qs.total_elapsed_time AS
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'total_elapsed_time',
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qs.total_elapsed_time / qs.execution_count AS 'avg_elapsed_time'
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,
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qs.cached_time AS
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'cached_time'
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FROM sys.procedures AS p
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INNER JOIN sys.dm_exec_procedure_stats AS qs
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ON p.[object_id] = qs.[object_id]
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WHERE qs.database_id = Db_id()
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ORDER BY qs.total_logical_reads DESC;
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----------------------------------------------
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/*** 7. Top Performance Counters – Memory ***/
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----------------------------------------------
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-- Get size of SQL Server Page in bytes
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DECLARE @pg_size INT,
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@Instancename VARCHAR(50)
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SELECT @pg_size = low
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FROM master..spt_values
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WHERE number = 1
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AND type = 'E'
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-- Extract perfmon counters to a temporary table
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IF Object_id('tempdb..#perfmon_counters') IS NOT NULL
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DROP TABLE #perfmon_counters
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SELECT *
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INTO #perfmon_counters
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FROM sys.dm_os_performance_counters;
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-- Get SQL Server instance name as it require for capturing Buffer Cache hit Ratio
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SELECT @Instancename = LEFT([object_name], ( Charindex(':', [object_name]) ))
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FROM #perfmon_counters
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WHERE counter_name = 'Buffer cache hit ratio';
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SELECT *
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FROM (SELECT 'Total Server Memory (GB)' AS Counter,
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( cntr_value / 1048576.0 ) AS Value
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FROM #perfmon_counters
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WHERE counter_name = 'Total Server Memory (KB)'
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UNION ALL
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SELECT 'Target Server Memory (GB)',
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( cntr_value / 1048576.0 )
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FROM #perfmon_counters
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WHERE counter_name = 'Target Server Memory (KB)'
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UNION ALL
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SELECT 'Connection Memory (MB)',
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( cntr_value / 1024.0 )
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FROM #perfmon_counters
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WHERE counter_name = 'Connection Memory (KB)'
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UNION ALL
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SELECT 'Lock Memory (MB)',
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( cntr_value / 1024.0 )
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FROM #perfmon_counters
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WHERE counter_name = 'Lock Memory (KB)'
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UNION ALL
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SELECT 'SQL Cache Memory (MB)',
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( cntr_value / 1024.0 )
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FROM #perfmon_counters
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WHERE counter_name = 'SQL Cache Memory (KB)'
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UNION ALL
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SELECT 'Optimizer Memory (MB)',
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( cntr_value / 1024.0 )
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FROM #perfmon_counters
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WHERE counter_name = 'Optimizer Memory (KB) '
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UNION ALL
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SELECT 'Granted Workspace Memory (MB)',
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( cntr_value / 1024.0 )
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FROM #perfmon_counters
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WHERE counter_name = 'Granted Workspace Memory (KB) '
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UNION ALL
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SELECT 'Cursor memory usage (MB)',
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( cntr_value / 1024.0 )
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FROM #perfmon_counters
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WHERE counter_name = 'Cursor memory usage'
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AND instance_name = '_Total'
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UNION ALL
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SELECT 'Total pages Size (MB)',
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( cntr_value * @pg_size ) / 1048576.0
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FROM #perfmon_counters
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WHERE object_name = @Instancename + 'Buffer Manager'
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AND counter_name = 'Total pages'
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UNION ALL
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SELECT 'Database pages (MB)',
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( cntr_value * @pg_size ) / 1048576.0
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FROM #perfmon_counters
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WHERE object_name = @Instancename + 'Buffer Manager'
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AND counter_name = 'Database pages'
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UNION ALL
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SELECT 'Free pages (MB)',
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( cntr_value * @pg_size ) / 1048576.0
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FROM #perfmon_counters
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WHERE object_name = @Instancename + 'Buffer Manager'
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AND counter_name = 'Free pages'
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UNION ALL
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SELECT 'Reserved pages (MB)',
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( cntr_value * @pg_size ) / 1048576.0
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FROM #perfmon_counters
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WHERE object_name = @Instancename + 'Buffer Manager'
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AND counter_name = 'Reserved pages'
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UNION ALL
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SELECT 'Stolen pages (MB)',
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( cntr_value * @pg_size ) / 1048576.0
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FROM #perfmon_counters
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WHERE object_name = @Instancename + 'Buffer Manager'
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AND counter_name = 'Stolen pages'
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UNION ALL
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SELECT 'Cache Pages (MB)',
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( cntr_value * @pg_size ) / 1048576.0
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FROM #perfmon_counters
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WHERE object_name = @Instancename + 'Plan Cache'
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AND counter_name = 'Cache Pages'
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AND instance_name = '_Total'
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UNION ALL
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SELECT 'Page Life Expectency in seconds',
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cntr_value
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FROM #perfmon_counters
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WHERE object_name = @Instancename + 'Buffer Manager'
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AND counter_name = 'Page life expectancy'
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UNION ALL
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SELECT 'Free list stalls/sec',
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cntr_value
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FROM #perfmon_counters
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WHERE object_name = @Instancename + 'Buffer Manager'
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AND counter_name = 'Free list stalls/sec'
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UNION ALL
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SELECT 'Checkpoint pages/sec',
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cntr_value
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FROM #perfmon_counters
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WHERE object_name = @Instancename + 'Buffer Manager'
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AND counter_name = 'Checkpoint pages/sec'
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UNION ALL
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SELECT 'Lazy writes/sec',
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cntr_value
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FROM #perfmon_counters
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WHERE object_name = @Instancename + 'Buffer Manager'
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AND counter_name = 'Lazy writes/sec'
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UNION ALL
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SELECT 'Memory Grants Pending',
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cntr_value
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FROM #perfmon_counters
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WHERE object_name = @Instancename + 'Memory Manager'
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AND counter_name = 'Memory Grants Pending'
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UNION ALL
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SELECT 'Memory Grants Outstanding',
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cntr_value
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FROM #perfmon_counters
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WHERE object_name = @Instancename + 'Memory Manager'
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AND counter_name = 'Memory Grants Outstanding'
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UNION ALL
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SELECT 'process_physical_memory_low',
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process_physical_memory_low
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FROM sys.dm_os_process_memory WITH (nolock)
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UNION ALL
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SELECT 'process_virtual_memory_low',
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process_virtual_memory_low
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FROM sys.dm_os_process_memory WITH (nolock)
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UNION ALL
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SELECT 'Max_Server_Memory (MB)',
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[value_in_use]
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FROM sys.configurations
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WHERE [name] = 'max server memory (MB)'
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UNION ALL
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SELECT 'Min_Server_Memory (MB)',
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[value_in_use]
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FROM sys.configurations
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WHERE [name] = 'min server memory (MB)'
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UNION ALL
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SELECT 'BufferCacheHitRatio',
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( a.cntr_value * 1.0 / b.cntr_value ) * 100.0
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FROM sys.dm_os_performance_counters a
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JOIN (SELECT cntr_value,
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object_name
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FROM sys.dm_os_performance_counters
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WHERE counter_name = 'Buffer cache hit ratio base'
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AND object_name = @Instancename + 'Buffer Manager')
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b
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ON a.object_name = b.object_name
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WHERE a.counter_name = 'Buffer cache hit ratio'
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AND a.object_name = @Instancename + 'Buffer Manager') AS D;
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