dmv queries

Label:Original: Seventh--dmvs and DMFs (3)--monitoring tempdb with a DMV and DMFObjective:We all know that TempDB is the system database for SQL Server and that the daily operation of SQL Server relies heavily on this library. Therefore, it is particularly important to monitor performance issues with TempDB . Over a long period of time, many people have overlooked the importance of TempDB and ignored its performance problems. This is not a good thing

Original: DBA tool--dmv--View stored procedure execution information through Sys.dm_exec_procedure_statsFor DBAs, there is often some information about the phone's stored procedure: How many times did you execute How does the execution plan What is the average read and write performed How long does it take to execute on average Column Name Data Type Description database_id int

Misunderstanding #13. DMV cannot be used in SQL Server 2000 compatibility mode Error There are many misunderstandings about the compatibility mode. Does the database in the compatible mode of 80 mean that it can be attached or restored to the SQL Server 2000 database? Of course not. It just means some T-SQL syntaxes, the behavior of the query plan and some other aspects are the same as the behavior in SQL Server 2000 (of course, if you set the compa

Misunderstanding #13. DMV cannot be used in SQL Server 2000 compatibility mode Error There are many misunderstandings about the compatibility mode. Does the database in the compatible mode of 80 mean that it can be attached or restored to the SQL Server 2000 database? Of course not. It just means some T-SQL syntaxes, the behavior of the query plan and some other aspects are the same as the behavior in SQL Server 2000 (of course, if you set the compati

Misunderstanding #13. The DMV cannot be used in SQL Server 2000 compatibility mode Error There has been a lot of misunderstanding about compatibility mode. Does the 80 compatibility mode database imply the ability to attach or recover to a SQL Server 2000 database? Of course not. This simply means some T-SQL syntax, the behavior of the query plan, and some other aspects as in SQL Server 2000 (of course, if you set it to 90 compatibility mode, as in

When you find that the database query performance is very slow, you will think of adding indexes to optimize the database query performance. However, in the face of a complicated SQL statement, finding an optimized index combination is for the human brain, it's really not a simple task. Fortunately, SQLSERVER provides two "automatic" functions. We recommend that you adjust the index. The first is to use DMV. Second, database engine tuning advisor This

When you find that the database query performance is very slow, you will think of adding indexes to optimize the database query performance. However, in the face of a complicated SQL statement, finding an optimized index combination is for the human brain, it's really not a simple task. Fortunately, SQLSERVER provides two "automatic" functions. We recommend that you adjust the index. The first is to use DMV. Second, database engine tuning advisor This

Original: SQL SERVER memory allocation and common memory issues (2)--DMV queryMemory dynamic management view (DMV):Starting from Sys.dm_os_memory_clerks.SELECT [Type], sum (virtual_memory_reserved_kb) as [VM reserved], sum (virtual_memory_committed_kb) as [ VM Committed], sum (awe_allocated_kb) as [awe allocated], sum (shared_memory_reserved_kb) as [SM reserved], SUM (sha

Original: Seventh--dmvs and DMFs (4)--monitoring disk IO with DMV and DMFObjective:This is the last article in this series, as a DBA, you must always focus on disk I/O issues, and when problems arise, analyze what is the problem as quickly as possible. SQL Server also provides some columns of I/O -related DMO to monitor.This article describes how to use DMO to monitor the performance of the I/O subsystem and find I/O bottlenecks. In this article, I/O

Label:SQL Server 2012 new and changed DMV System View Description SYS.DM_EXEC_QUERY_STATS (Transact-SQL) Four columns were added to help troubleshoot problems with long-running queries. SYS.DM_OS_VOLUME_STATS (Transact-SQL) by using this dynamic management function, you can check the properties of the physical disk drive, or return i

, "ismsshipped") = 0And I.name is not NULLAnd s.object_id is NULL 'SELECT * from #TempNeverUsedIndexesORDER by Datbasename, SchemaName, TableName, IndexNameDROP TABLE #TempNeverUsedIndexesResults:Such indexes should be treated with care, not generalize, to see what causes the problemTo view information about index statisticsSET TRANSACTION Isolation Level READ UNCOMMITTEDSELECTSs.name as SchemaName, St.name as TableName, S.name as IndexName, Stats_date (S.id,s.indid) as ' Statistics last Updated

DMV about Indexes 1. View indexes that are updated but rarely used SET transaction isolation level read uncommittedSelectDb_name () as databasename, Schema_name (O. schema_id) as schemaname, Object_name (S. [object_id]) as tablename, I. Name as indexname, S. user_updates, S. system_seeks + S. system_scans + S. system_lookupsAs [system usage]Into # tempunusedindexesFrom SYS. dm_db_index_usage_statsInner join SYS. Indexes I on S. [object_id] = I.

(max ),Qt. Text) * 2 else Qs. statement_end_offset end-Qs. statement_start_offset)/2), [Parent query] = QT. Text, Databasename = db_name (QT. dbid), CP. cacheobjtypeFrom SYS. dm_exec_query_stats QsCross apply SYS. dm_exec_ SQL _text (Qs. SQL _handle) as QTInner join SYS. dm_exec_cached_plans as CP on Qs. plan_handle = CP. plan_handleWhere CP. plan_handle = Qs. plan_handleOrder by [plan usage] ASC; Database ConnectionSelect session_id, connect_time, endpoint_id, auth_scheme, num_reads, num_wri

. dm_exec_sessions sessOn blocking. session_id = sess. session_idInner join SYS. dm_tran_session_transactions StOn blocking. session_id = ST. session_idLeft Outer Join SYS. dm_exec_requests erOn st. session_id = ER. session_idAnd er. session_id is nullInner join SYS. dm_ OS _waiting_tasks as waitsOn blocked. session_id = waits. session_idCross apply SYS. dm_exec_ SQL _text (blocking. most_recent_ SQL _handle)As blockingsqlInner join SYS. dm_exec_requests as blockedreqOn waits. session_id = block

Original: DBA tool--dmv--How to know how long a TSQL statement has been runningThe DBA usually wants to know how long the running statement has been executed? You can use SQL Server Profiler to capture the start time of a statement and compare it to an existing time, but in a production environment there is usually a negative impact on performance, so it is generally not recommended that you use it in a production environment without unnecessary assum