华为云云数据库rdsRDS SQL Server支持DMV动态管理视图_云淘科技

RDS for SQL Server支持DMV动态管理视图,方便用户快速查询实例上性能消耗最高的10条SQL语句。

操作场景

数据库执行效率较低。
某些时段的CPU,IO较高。

操作步骤

登录SQL SERVER客户端,通过rdsuser帐号连接目标实例,在管理面中执行以下SQL语句。

declare @DatabaseName nvarchar(100)
set @DatabaseName = 'Wisdom_TT_ODS'

select top 100
DB_NAME(st.dbid) as DBName, OBJECT_NAME(st.objectid,st.dbid) as ObjectName,
substring(st.text,(qs.statement_start_offset/2)+1,((case qs.statement_end_offset when -1 then datalength(st.text) else qs.statement_end_offset end - qs.statement_start_offset)/2) + 1) as Statement,
st.text as Query,
qp.query_plan,
plan_generation_num,
creation_time,
last_execution_time,
execution_count,
total_worker_time,
min_worker_time,
max_worker_time,
total_logical_reads,
min_logical_reads,
max_logical_reads,
total_elapsed_time,
min_elapsed_time,
max_elapsed_time,
total_rows,
min_rows,
max_rows,
total_worker_time/execution_count as avg_worker_time,                            --平均CPU耗时
total_logical_reads/execution_count as avg_logical_reads,                        --平均逻辑读
total_elapsed_time/execution_count as avg_elapsed_time,                          --平均总耗时
total_rows/execution_count as avg_rows,                                          --平均处理数据行
sql_handle,
plan_handle,
query_hash,
query_plan_hash
from sys.dm_exec_query_stats qs
cross apply sys.dm_exec_sql_text(plan_handle) st
cross apply sys.dm_exec_query_plan(plan_handle) qp
where st.dbid=DB_ID(@DatabaseName)
and text not like '%sys.%'and text not like '%[[]sys]%'
order by avg_worker_time desc

查看结果中对应数据库的SQL执行记录及资源消耗情况。

父主题: RDS for SQL Server

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