查看SqlServer的内存使用情况

SQL SERVER内存按存放数据的类型,大概可以分为三类:

1、buffer pool,存放数据页面的缓冲区,sql server数据都是存放在一个个8K的页面里,当用户需要使用这个页面上的数据时,都是把整个页面加载到内存的buffer pool区缓存起来。

2、各类consumer:

      connect:SQL SERVER为每一个客户端连接分配一块内存,用来存储连接的信息,以及发过来的指令和缓存指令结果待待客户端取走

      无数据:表、存储过程、索引等的元数据

      锁:SQL SERVER中锁是稀有资源,会占用大量内存

      Query plan:缓存SQL的执行计划

      Optimizer:生成执行 计划过程中需要使用内存

3、线程内存:sql server会为每个线程分配0.5M的内存,用来存放线程的数据结构和相关信息

 

sql1:

-- 查询SqlServer总体的内存使用情况
select      type
        , sum(virtual_memory_reserved_kb) VM_Reserved
        , sum(virtual_memory_committed_kb) VM_Commited
        , sum(awe_allocated_kb) AWE_Allocated
        , sum(shared_memory_reserved_kb) Shared_Reserved
        , sum(shared_memory_committed_kb) Shared_Commited
        --, sum(single_pages_kb)    --SQL2005、2008
        --, sum(multi_pages_kb)        --SQL2005、2008
from    sys.dm_os_memory_clerks
group by type
order by type


-- 查询当前数据库缓存的所有数据页面,哪些数据表,缓存的数据页面数量
-- 从这些信息可以看出,系统经常要访问的都是哪些表,有多大?
select p.object_id, object_name=object_name(p.object_id), p.index_id, buffer_pages=count(*) 
from sys.allocation_units a, 
    sys.dm_os_buffer_descriptors b, 
    sys.partitions p 
where a.allocation_unit_id=b.allocation_unit_id 
    and a.container_id=p.hobt_id 
    and b.database_id=db_id()
group by p.object_id,p.index_id 
order by buffer_pages desc 


-- 查询缓存的各类执行计划,及分别占了多少内存
-- 可以对比动态查询与参数化SQL(预定义语句)的缓存量
select    cacheobjtype
        , objtype
        , sum(cast(size_in_bytes as bigint))/1024 as size_in_kb
        , count(bucketid) as cache_count
from    sys.dm_exec_cached_plans
group by cacheobjtype, objtype
order by cacheobjtype, objtype


-- 查询缓存中具体的执行计划,及对应的SQL
-- 将此结果按照数据表或SQL进行统计,可以作为基线,调整索引时考虑
-- 查询结果会很大,注意将结果集输出到表或文件中
SELECT  usecounts ,
        refcounts ,
        size_in_bytes ,
        cacheobjtype ,
        objtype ,
        TEXT
FROM    sys.dm_exec_cached_plans cp
        CROSS APPLY sys.dm_exec_sql_text(plan_handle)
ORDER BY objtype DESC ;
GO
 
-- 查看SQL语句占用多大内存:
SELECT s2.dbid, 
s1.sql_handle, 
(SELECT TOP 1 SUBSTRING(s2.text,statement_start_offset / 2+1 , 
( (CASE WHEN statement_end_offset = -1 
THEN (LEN(CONVERT(nvarchar(max),s2.text)) * 2) 
ELSE statement_end_offset END) - statement_start_offset) / 2+1)) AS sql_statement,
execution_count, 
plan_generation_num, 
last_execution_time, 
total_worker_time, 
last_worker_time, 
min_worker_time, 
max_worker_time,
total_physical_reads, 
last_physical_reads, 
min_physical_reads, 
max_physical_reads, 
total_logical_writes, 
last_logical_writes, 
min_logical_writes, 
max_logical_writes 
FROM sys.dm_exec_query_stats AS s1 
CROSS APPLY sys.dm_exec_sql_text(sql_handle) AS s2 
WHERE s2.objectid is null 
ORDER BY s1.sql_handle, s1.statement_start_offset, s1.statement_end_offset;

sql2:

复制代码
select OBJECT_NAME(object_id) 表名,COUNT(*) 页数,COUNT(*)*8/1024.0 Mb                            
from   sys.dm_os_buffer_descriptors a,sys.allocation_units b,sys.partitions c                            
where  a.allocation_unit_id=b.allocation_unit_id 
       and b.container_id=c.hobt_id           
       and database_id=DB_ID()                            
group by OBJECT_NAME(object_id)                         
order by 2 desc
复制代码

 

参考:

http://www.cnblogs.com/zhaoguan_wang/p/4602866.html

http://blog.csdn.net/shutao917/article/details/51444424

http://blog.csdn.net/burgess_liu/article/details/52813727

http://blog.csdn.net/burgess_liu/article/details/17739725

http://blog.csdn.net/burgess_liu/article/details/17733149

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