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DMV sys.dm_exec_sessions: SELECT session_id, login_time, login_name, db_name (database_id) as DB, IIF ( authenticating_database_id = 1, ' server login ', QUOTENAME (db_name (authenticating_database_id)) + ' user ' + QUOTENAME (original_login_name)) As Authentication_type from sys.dm_exec_sessions WHERE is_user_process = 1; Principle: The inclusion database has brought some changes

Label:IntroductionSQL Server uses tools to monitor data, one of which is the dynamic management Management view (DMV). General Dynamic Server Management Objects Dm_db_*: Database and Database objects dm_exec_*: Executing user code and associated connections dm_os_*: Memory, Lock, schedule Dm_tran_*: Transactions and isolation dm_io_*: Network and disk input and output Data cachingFor each database cache size in the curre

In your DBA profession, who have you ever worked with the DBCC inputbuffer command to get the last SQL statement that has been committed to a specific session of SQL Server? Raise your hand, please! Everyone has used it!We all know that DBCC commands are a little awkward because you can't call them in T-SQL queries, and you can't correlate their output to other DMV/DMF. For example, you want to return the last SQL statement executed for each user sess

there is enough free memory. Otherwise, it will be queued up in a waiting queue. 2. When a resource semaphore receives a query request, it checks the wait queue for a pending request, and if so, the request is also placed in the queue for this FIFO. 3. The resource signal attempts to grant memory when there are no waiting queries in the queue or when the previous query returns memory that is reserved. 4. If a waiting query is found, the requested query is entered into the queue. 5. If there is

estimated using this formula: Buffer pool occupies memory + memory +multipageallocator allocated from buffer pool of the paged pool memory, as shown in 9.Figure 9: Approximate estimation of the memory occupied by SQL ServerMemory Object Menory object is essentially a heap, assigned by page allocator and can be viewed by sys.dm_os_memory_objects this DMV, which can see a column of Page_ The allocator_address column, which is the ID of the memory cler

Exclusive lock.Lck_m_uOccurs when a task was waiting to acquire an Update lock.Lck_m_uixOccurs when a task was waiting to acquire an Update with Intent Exclusive lock.Lck_m_xOccurs when a task was waiting to acquire an Exclusive lock.lck_m_xxx Explanation:I think the explanation of this wait type is the simplest. When the any task was waiting to acquire lock on any resource, this particular wait type occurs. The common reason for the task to being waiting to put lock on the resource are that th

identified above. I ' ll present the query, then we can examine in detail what it provi Des for us. SELECTDEST.TEXTFROMsys.[dm_exec_connections]SDECCROSSAPPLYsys.[dm_exec_sql_text](SDEC.[most_recent_sql_handle])ASDESTWHERESDEC.[most_recent_session_id]=52 The output for this query shows the statement, is run for session_id 52.So what just happened? Simply-put, we returned the results from the sys.dm_exec_connections DMV, li

RESOURCE POOL [Rp_reportapp]with (Min_cpu_percent=25,max_ Cpu_percent =100,min_memory_percent =25,max_memory_percent =100) GO CREATE WORKLOAD GROUP [Rg_reportapp]with (GROUP_MAX _requests=0,importance=medium,request_max_cpu_time_sec=300,request_max_memory_grant_percent=25,request_memory_ grant_timeout_sec=0,max_dop=0) USING [Rp_reportapp]go ALTER RESOURCE Governorwith (classifier_function=[dbo].[ Rgclassifier]); GO ALTER RESOURCE GOVERNOR reconfigurego 4, in order to check whether the creation

performance gains of indexes, it's very difficult to actually build enough correct and necessary indexes at the outset, how can we infer which tables need to be indexed and which ones are not built correctly?Typically, SQL Server executes a query script with an existing index, assuming that no index is found he will voluntarily generate one and store it in the DMV (dynamic management view).This information is purged whenever the SQL Server service re

Label:This weekend I found an interesting side effect of Hekaton in SQL Server 2014, unfortunately it negatively affects your database's target recovery time (Recovery-Objective,rto). As you know, for each local compiled table and stored procedure, Hekaton creates a DLL, which is implemented in C language code. These DLL files are loaded into the sqlservr.exe execution space. You can use the following query to view the currently loaded Hekaton table through the

result in a large number of IO requests. By using IO resource management, you can limit the IO load on these operations to ensure that the concurrency and performance of the OLTP are unaffected. Make the entire server environment more secure.In SQL Server 2014, the control of IO resources has been increased to address these issues, based on customer requests.Resource pools, workload groups, and classification concepts are the same as before.The following are the new features added by SQL Server

different page.If you want to know how much space is wasted on each page after your database design, you can query the following buffer pool by using the dynamic management view (DMV) below: sys.dm_os_buffer_descriptors Each record displayed from this dynamic management view (DMV) represents every page that is currently saved in the cache pool, and when you query this dynamic management view on a machine w

How to view LocksUnderstanding the locking of SQL Server at a certain point in time is undoubtedly an effective means of learning to lock and diagnose database deadlock and performance. The most common way to view database locks is in two ways:Use sys.dm_tran_locks this DMVSQL Server provides sys.dm_tran_locks this DMV to view the locks in the current database, as shown in the previous Figure 2 by this DMV.It is worth noting that sys.dm_tran_locks thi

Label:1. Query How much space is wasted on each database If you want to know how much space is wasted on each page after your database design, you can query the following buffer pool by using the dynamic management view (DMV) below: sys.dm_os_buffer_descriptors Each record displayed from this dynamic management view (DMV) represents every page that is currently saved in the cache pool, and when you query th

authorize the following object types: Security object Description Endpoints (endpoint) View definition, change, take over ownership, control, connection Logins (login name) View definition, change, control, and Simulation Servers (server) Server-level Permissions Availability Groups (Availability Group) Availability Group Management Right Server Roles) Allows you to manage custom server roles of other users. For examp

bytes. Therefore, the actual size of each page for storage is 8060 bytes. For example, in the Person. Address Table in AdventureWorks above, the data space of this table is shown in SSMS: We can use the formula to estimate the number of pages occupied: 2.250*1024*1024/8060 (data capacity per page) ≈ 293-space occupied by non-data in the table ≈ 290 (number of logical reads in) SQL SERVER query statement execution sequence The SQL SERVER query execution steps are very many from the microscop

transaction' When 3 then 'System transaction' When 4 then 'distributed transaction' End tran_Type, Case transaction_state When 0 then 'not been comoletely initaialiaed yun' When 1 then 'initaialiaed but ha notstarted' When 2 then 'active' When 3 then 'ended (read-only transaction )' When 4 then 'commit initiated for distributed transaction' When 5 then 'transaction prepared and waiting resolution' When 6 then 'commited' When 7 then 'being rolled back' When 0 then 'been rolled back' End transact

file and configure F: \ SQLDIAOUT as the output directory. This folder does not need to be created in advance. It will automatically create SQLdiag.exe/I SD_General.XML/O F: \ SQLDIAOUT During running, you can see that SQLdiag enables Perfmon (AddingPerfmon counters) and Trace (Starting Profiler Trace) After the problem is tracked, press Ctrl + C to stop log collection. Some information is collected before the tool is disabled, so it may take a while to completely stop In the directory F: \ SQ

lighter, shorter, and only used inside the storage engine. MVP Glenn Berry has a blog post showing the DMV of sys. dm_ OS _wait_stats. In this blog, you can find out what causes the most blocking on your server. If you find it is a PAGELATCH wait, you can use this script to check whether it is caused by FPS, GAM, or SGAM contention. If you encounter a lock contention, you can track 1118 or create more TempDB files to ease this situation (the principl

AdminQueries with(max_cpu_percent=100)Create Resource Pool UserQueries with(max_cpu_percent=100) Run the test script. The CPU usage diagram is as follows: Adjust the resource allocation as follows: Create Resource Pool AdminQueries with(max_cpu_percent=10)Create Resource Pool UserQueries with(max_cpu_percent=90) Run the test script again. The CPU usage diagram is as follows: We can see that when we adjust resources, the two sessions run the same script, and the resources they use vary grea