sql 语句收集

SELECT type as 'plan cache store', buckets_count 

FROM sys.dm_os_memory_cache_hash_tables

WHERE type IN ('CACHESTORE_OBJCP', 'CACHESTORE_SQLCP'); 

SELECT type, count(*) total_entries 

FROM sys.dm_os_memory_cache_entries 

WHERE type IN ('CACHESTORE_SQLCP', 'CACHESTORE_OBJCP') 

GROUP BY type;

执行计划开销

SELECT text, objtype, refcounts, usecounts, size_in_bytes, 

disk_ios_count, context_switches_count, 

pages_allocated_count, original_cost, current_cost 

FROM sys.dm_exec_cached_plans p

CROSS APPLY sys.dm_exec_sql_text(plan_handle) 

JOIN sys.dm_os_memory_cache_entries e

ON p.memory_object_address = e.memory_object_address 

WHERE cacheobjtype = 'Compiled Plan'

AND type in ('CACHESTORE_SQLCP', 'CACHESTORE_OBJCP') 

ORDER BY objtype desc, usecounts DESC;

各数据库使用内存大小

SELECT count(*)*8  as cached_pages_kb,CASE database_id

WHEN 32767 THEN 'ResourceDb'

ELSE db_name(database_id)

END AS Database_name

FROM sys.dm_os_buffer_descriptors

GROUP BY db_name(database_id) ,database_id

ORDER BY cached_pages_kb DESC;

热表

SELECT count(*)*8 AS cached_pages_kb

,obj.name ,obj.index_id,b.type_desc,b.name

FROM sys.dm_os_buffer_descriptors AS bd

INNER JOIN

(

SELECT object_name(object_id) AS name

,index_id ,allocation_unit_id,object_id

FROM sys.allocation_units AS au

INNER JOIN sys.partitions AS p

ON au.container_id = p.hobt_id

AND (au.type = 1 OR au.type = 3)

UNION ALL

SELECT object_name(object_id) AS name

,index_id, allocation_unit_id,object_id

FROM sys.allocation_units AS au

INNER JOIN sys.partitions AS p

ON au.container_id = p.partition_id

AND au.type = 2

) AS obj

ON bd.allocation_unit_id = obj.allocation_unit_id

LEFT JOIN sys.indexes b on b.object_id = obj.object_id AND b.index_id = obj.index_id

WHERE database_id = db_id()

GROUP BY obj.name, obj.index_id ,b.name,b.type_desc

ORDER BY cached_pages_kb DESC;

执行计划使用情况

SELECT  TOP 6

 LEFT([name], 20) as [name],

 LEFT([type], 20) as [type],

 [single_pages_kb] + [multi_pages_kb] AS cache_kb,

 [entries_count]

FROM sys.dm_os_memory_cache_counters 

order by single_pages_kb + multi_pages_kb DESC