Memory

 ------Query to Find out how big buffer pool is and determine percentage used by each database

DECLARE @total_buffer INT;
SELECT @total_buffer = cntr_value FROM sys.dm_os_performance_counters
WHERE RTRIM([object_name]) LIKE '%Buffer Manager' AND counter_name = 'Total Pages';
;WITH src AS( SELECT database_id, db_buffer_pages = COUNT_BIG(*)
FROM sys.dm_os_buffer_descriptors --WHERE database_id BETWEEN 5 AND 32766
GROUP BY database_id)SELECT [db_name] = CASE [database_id] WHEN 32767 THEN 'Resource DB' ELSE DB_NAME([database_id]) END, db_buffer_pages, db_buffer_MB = db_buffer_pages / 128, db_buffer_percent = CONVERT(DECIMAL(6,3), db_buffer_pages * 100.0 / @total_buffer)
FROM src
ORDER BY db_buffer_MB DESC;

------We can also check memory used by objects in database of your choice

USE MyDatabase;

WITH src AS( SELECT [Object] = o.name, [Type] = o.type_desc, [Index] = COALESCE(i.name, ''), [Index_Type] = i.type_desc, p.[object_id], p.index_id, au.allocation_unit_id
FROM sys.partitions AS p INNER JOIN sys.allocation_units AS au ON p.hobt_id = au.container_id INNER JOIN sys.objects AS o ON p.[object_id] = o.[object_id] INNER JOIN sys.indexes AS i ON o.[object_id] = i.[object_id] AND p.index_id = i.index_id WHERE au.[type] IN (1,2,3) AND o.is_ms_shipped = 0)
SELECT src.[Object], src.[Type], src.[Index], src.Index_Type, buffer_pages = COUNT_BIG(b.page_id), buffer_mb = COUNT_BIG(b.page_id) / 128
FROM src
INNER JOIN sys.dm_os_buffer_descriptors AS b
ON src.allocation_unit_id = b.allocation_unit_id
WHERE b.database_id = DB_ID()
GROUP BY src.[Object], src.[Type], src.[Index], src.Index_Type
ORDER BY buffer_pages DESC;
-- This helps you find the most expensive cached stored procedures from a memory perspective
-- You should look at this if you see signs of memory pressure

-- Top Cached SPs By Total Physical Reads (SQL 2008). Physical reads relate to disk I/O pressure
SELECT TOP(25) p.name AS [SP Name],qs.total_physical_reads AS [TotalPhysicalReads],
qs.total_physical_reads/qs.execution_count AS [AvgPhysicalReads], qs.execution_count,
qs.total_logical_reads,qs.total_elapsed_time, qs.total_elapsed_time/qs.execution_count
AS [avg_elapsed_time], qs.cached_time
FROM sys.procedures AS p
INNER JOIN sys.dm_exec_procedure_stats AS qs
ON p.[object_id] = qs.[object_id]
WHERE qs.database_id = DB_ID()
ORDER BY qs.total_physical_reads, qs.total_logical_reads DESC;

 

Query to find Performance counters values

/*=====================================================================

Author: Amit Vaid

Date: January 2013

Please check the query on test server before running on Production.

======================================================================*/

SET NOCOUNT ON

-- Get size of SQL Server Page in bytes
DECLARE @pg_size INT, @Instancename varchar(50)
SELECT @pg_size = low from master..spt_values where number = 1 and type = 'E'

-- Extract perfmon counters to a temporary table
IF OBJECT_ID('tempdb..#check_performance') is not null DROP TABLE #check_performance

SELECT * INTO #check_performance FROM sys.dm_os_performance_counters

-- Get SQL Server instance name
SELECT @Instancename = LEFT([object_name], (CHARINDEX(':',[object_name]))) FROM #check_performance WHERE counter_name = 'Buffer cache hit ratio'

-- Print Memory usage details
PRINT '----------------------------------------------------------------------------------------------------'
PRINT 'Memory usage details for SQL Server instance ' + @@SERVERNAME + ' (' + CAST(SERVERPROPERTY('productversion') AS VARCHAR) + ' - ' + SUBSTRING(@@VERSION, CHARINDEX('X',@@VERSION),4) + ' - ' + CAST(SERVERPROPERTY('edition') AS VARCHAR) + ')'
PRINT '----------------------------------------------------------------------------------------------------'
SELECT 'Memory visible to the Operating System'
SELECT CEILING(physical_memory_in_bytes/1048576.0) as [Physical Memory_MB], CEILING(physical_memory_in_bytes/1073741824.0) as [Physical Memory_GB], CEILING(virtual_memory_in_bytes/1073741824.0) as [Virtual Memory GB] FROM sys.dm_os_sys_info
SELECT 'Buffer Pool Usage at the Moment'
SELECT (bpool_committed*8)/1024.0 as BPool_Committed_MB, (bpool_commit_target*8)/1024.0 as BPool_Commit_Tgt_MB,(bpool_visible*8)/1024.0 as BPool_Visible_MB FROM sys.dm_os_sys_info
SELECT 'Total Memory used by SQL Server Buffer Pool as reported by Perfmon counters'
SELECT cntr_value as Mem_KB, cntr_value/1024.0 as Mem_MB, (cntr_value/1048576.0) as Mem_GB FROM #check_performance WHERE counter_name = 'Total Server Memory (KB)'
SELECT 'Memory needed as per current Workload for SQL Server instance'
SELECT cntr_value as Mem_KB, cntr_value/1024.0 as Mem_MB, (cntr_value/1048576.0) as Mem_GB FROM #check_performance WHERE counter_name = 'Target Server Memory (KB)'
SELECT 'Total amount of dynamic memory the server is using for maintaining connections'
SELECT cntr_value as Mem_KB, cntr_value/1024.0 as Mem_MB, (cntr_value/1048576.0) as Mem_GB FROM #check_performance WHERE counter_name = 'Connection Memory (KB)'
SELECT 'Total amount of dynamic memory the server is using for locks'
SELECT cntr_value as Mem_KB, cntr_value/1024.0 as Mem_MB, (cntr_value/1048576.0) as Mem_GB FROM #check_performance WHERE counter_name = 'Lock Memory (KB)'
SELECT 'Total amount of dynamic memory the server is using for the dynamic SQL cache'
SELECT cntr_value as Mem_KB, cntr_value/1024.0 as Mem_MB, (cntr_value/1048576.0) as Mem_GB FROM #check_performance WHERE counter_name = 'SQL Cache Memory (KB)'
SELECT 'Total amount of dynamic memory the server is using for query optimization'
SELECT cntr_value as Mem_KB, cntr_value/1024.0 as Mem_MB, (cntr_value/1048576.0) as Mem_GB FROM #check_performance WHERE counter_name = 'Optimizer Memory (KB) '
SELECT 'Total amount of dynamic memory used for hash, sort and create index operations.'
SELECT cntr_value as Mem_KB, cntr_value/1024.0 as Mem_MB, (cntr_value/1048576.0) as Mem_GB FROM #check_performance WHERE counter_name = 'Granted Workspace Memory (KB) '
SELECT 'Total Amount of memory consumed by cursors'
SELECT cntr_value as Mem_KB, cntr_value/1024.0 as Mem_MB, (cntr_value/1048576.0) as Mem_GB FROM #check_performance WHERE counter_name = 'Cursor memory usage' and instance_name = '_Total'
SELECT 'Number of pages in the buffer pool (includes database, free, and stolen).'
SELECT cntr_value as [8KB_Pages], (cntr_value*@pg_size)/1024.0 as Pages_in_KB, (cntr_value*@pg_size)/1048576.0 as Pages_in_MB FROM #check_performance WHERE object_name= @Instancename+'Buffer Manager' and counter_name = 'Total pages'
SELECT 'Number of Data pages in the buffer pool'
SELECT cntr_value as [8KB_Pages], (cntr_value*@pg_size)/1024.0 as Pages_in_KB, (cntr_value*@pg_size)/1048576.0 as Pages_in_MB FROM #check_performance WHERE object_name=@Instancename+'Buffer Manager' and counter_name = 'Database pages'
SELECT 'Number of Free pages in the buffer pool'
SELECT cntr_value as [8KB_Pages], (cntr_value*@pg_size)/1024.0 as Pages_in_KB, (cntr_value*@pg_size)/1048576.0 as Pages_in_MB FROM #check_performance WHERE object_name=@Instancename+'Buffer Manager' and counter_name = 'Free pages'
SELECT 'Number of Reserved pages in the buffer pool'
SELECT cntr_value as [8KB_Pages], (cntr_value*@pg_size)/1024.0 as Pages_in_KB, (cntr_value*@pg_size)/1048576.0 as Pages_in_MB FROM #check_performance WHERE object_name=@Instancename+'Buffer Manager' and counter_name = 'Reserved pages'
SELECT 'Number of Stolen pages in the buffer pool'
SELECT cntr_value as [8KB_Pages], (cntr_value*@pg_size)/1024.0 as Pages_in_KB, (cntr_value*@pg_size)/1048576.0 as Pages_in_MB FROM #check_performance WHERE object_name=@Instancename+'Buffer Manager' and counter_name = 'Stolen pages'
SELECT 'Number of Plan Cache pages in the buffer pool'
SELECT cntr_value as [8KB_Pages], (cntr_value*@pg_size)/1024.0 as Pages_in_KB, (cntr_value*@pg_size)/1048576.0 as Pages_in_MB FROM #check_performance WHERE object_name=@Instancename+'Plan Cache' and counter_name = 'Cache Pages' and instance_name = '_Total'
SELECT 'Page Life Expectancy - Number of seconds a page will stay in the buffer pool without references'
SELECT cntr_value as [Page Life in seconds],CASE WHEN (cntr_value > 300) THEN 'PLE is Healthy' ELSE 'PLE is not Healthy' END as 'PLE Status' FROM #check_performance WHERE object_name=@Instancename+'Buffer Manager' and counter_name = 'Page life expectancy'
SELECT 'Number of requests per second that had to wait for a free page'
SELECT cntr_value as [Free list stalls/sec] FROM #check_performance WHERE object_name=@Instancename+'Buffer Manager' and counter_name = 'Free list stalls/sec'
SELECT 'Number of pages flushed to disk/sec by a checkpoint or other operation that require all dirty pages to be flushed'
SELECT cntr_value as [Checkpoint pages/sec] FROM #check_performance WHERE object_name=@Instancename+'Buffer Manager' and counter_name = 'Checkpoint pages/sec'
SELECT 'Number of buffers written per second by the buffer manager"s lazy writer'
SELECT cntr_value as [Lazy writes/sec] FROM #check_performance WHERE object_name=@Instancename+'Buffer Manager' and counter_name = 'Lazy writes/sec'
SELECT 'Total number of processes waiting for a workspace memory grant'
SELECT cntr_value as [Memory Grants Pending] FROM #check_performance WHERE object_name=@Instancename+'Memory Manager' and counter_name = 'Memory Grants Pending'
SELECT 'Total number of processes that have successfully acquired a workspace memory grant'
SELECT cntr_value as [Memory Grants Outstanding] FROM #check_performance WHERE object_name=@Instancename+'Memory Manager' and counter_name = 'Memory Grants Outstanding'