nots dmv

The original: Who took my buffer PoolTransferred from: http://blogs.msdn.com/b/apgcdsd/archive/2011/01/11/buffer-pool.aspxI was doing SQL Server 7.0 technical support when a customer asked me, "My SQL Server buffer pool is large, is there a way to know which objects eat my buffer pool memory?" For example, can you tell which database it is, which table, and which index occupies buffer pool? "I didn't find the answer to that question at the time, but I kept that in mind. This problem was solved u

Driver's license nearly 6 years ago, a few days before the Shanghai traffic police sent a mobile phone message notification, let go to change the certificate.Originally intended to jiading DMV or QINGPU DMV to change the certificate, and later called Qingpu DMV consulting a bit, said only weeks 1-5 can handle. Then he askedAround the friend said Hami Road Shangha

use only the following diagnostic and troubleshooting commands, although theoretically you can run any Transact-SQL statement without parallel execution on the DAC: Query the dynamic management view (DMV) for basic diagnosis, such as querying sys. dm_tran_locks to learn about the lock status and query sys. dm_ OS _memory_cache_counters checks the cache quality and queries sys. dm_exec_requests and SYS. dm_exec_sessions to learn about active session

be smaller than the physical memory or threshold value. Otherwise, an error is reported, as shown in Figure 5. Figure 5. error message For this function, SQL Server introduces a brand new DMV and adds a column to the original DMV to describe the buffer pool extention, as shown in 6. Figure 6. New DMV and updates to the original

Introduction There is a huge difference between SQL statements that write and implement functions and SQL statements that can both implement functions and ensure performance. In many cases, developers only focus on implementing the required functions, while ignoring what they write.CodePerformance and the impact on the SQL server instance (I/O, CPU, memory consumption). This may even cause the entire SQL server instance to kill. This article aims to provide some simple steps to help you optimiz

than physical memory or thresholds, or they will be an error, as shown in Figure 5. Figure 5. Error message For this feature, SQL Server introduced a new DMV and added a column to the original DMV to describe the buffer Pool extention, as shown in Figure 6. Figure 6. Introduction of the new DMV and updates to the original

DMV requires View SERVER state permissions in a locally deployed SQL Server The DMV associated with the transactionSys.dm_tran_active_transactions: Returns information about the transaction of your current logical database.Sys.dm_tran_database_transactions: Returns information about a user's database-level transactions.Sys.dm_tran_locks: Returns information about the lock Manager resource that is currently

, our goal is to minimize this wait state. The more you wait, or the longer you wait, the slower your performance will be. When the waiting state reaches normal, the extended wait state is not needed, and these States need to be identified and corrected.SQL Server uses a variety of DMV to track these wait states, and interestingly, SQL Server can also collect some historical data about the wait states since the last time the SQL Server service was res

level to be completely isolated, a bit of concurrency ...). Therefore, SQL Server's default read commited is a good choice to strike a balance between isolation and concurrency. SQL Server passes the lock, just like a traffic light at a crossroads, to tell all concurrent connections that at the same time those resources can be read and those resources can be modified. As mentioned earlier, the query itself is not a gentleman, so it needs to be supervised. When a transaction requires access to a

Original address:Http://technet.microsoft.com/zh-cn/library/bb838723.aspxMicrosoft SQL Server 2005 provides tools to monitor the database. One way is to manage the view dynamically. The server state information returned by dynamic management view (DMV) and dynamic management functions (DMF) can be used to monitor the health of the server instance, diagnose problems, and optimize performance.General server dynamic management objects include: D

from other types of requests,As the request passes through the TDS protocol to SQL Server and the transfer is not complete, SQL Server begins to perform the requested action.(Generally, the entire requested packet is sent to SQL Server, and SQL Server considers the complete packet to start executing the request)However, the bulk load request is not the same, the packet contains a large amount of data, which is attached to the request, if the entire request is sent to completeSQL Server only sta

Original address: HTTP://SUPPORT.MICROSOFT.COM/GP/ANXIN_TECHTIP6/ZH-CNWhy does SQL Server use so much memory? SQL Server users often find that the SQL process uses a lot of memory. Most of this memory is used to cache the data the user wants to access in order to achieve optimal efficiency. How do you know what data is now being cached in memory? In fact, the database administrator to run a few queries, you can get the answer. Who's taking my buffer Pool?I was doing SQL Server 7.0 technical supp

+ CREATE UNIQUE CLUSTERED INDEXIdx_col1 onFoo (Col1) - GO + A --Insert a few test records at INSERT intoFooVALUES(1,1), (2,2), (3,3) - GO In order to trigger blocking, I start a new transaction in a different session, but do not commit: 1 begin transaction 2 3 UPDATE Foo set Col2 = 2 4 where Col1 = 1 This means that we get an exclusive lock (Exclusive Lock (X))on the record that needs to be modified, and we get the Intent exclusive lock on the correspon

--Insert a few test records at INSERT intoFooVALUES(1,1), (2,2), (3,3) - GO In order to trigger blocking, I start a new transaction in a different session, but do not commit: 1 begin transaction 2 3 UPDATE Foo set Col2 = 2 4 where Col1 = 1 This means that we get an exclusive lock (Exclusive Lock (X))on the record that needs to be modified, and we get the Intent exclusive lock on the corresponding page (intent-exclusive Lock (IX)) , the intent-exclusive lock

Transferred from Microsoft technical support forum: "My SQL Server Buffer Pool is very large. Is there a way to know which objects eat my buffer pool memory? For example, can you know which database, which table, and which index occupies the buffer pool ?" To solve this problem, you can use (DMV) SYS. dm_ OS _buffer_descriptors. This DMV is very powerful. According to SQL Server books online, this view is

into a tableSELECT *Into NewordersFrom OrdersGo--Add a new columnALTER TABLE NewordersADD full_details CHAR (no NULL DEFAULT ' full Details ')Go Then use the following script to see the size of this table EXEC sp_spaceused Neworders,trueGo We can see that the total size of the data page for this table is 2216KB, we know that a page is 8KB, you can infer that the data page of this table is: 2216 (data page total size)/8 (one data page size) = 277 page That means the datasheet has

), current CPU usage, Follow this information to help DBAs find the bottleneck In addition, when the query is still executing, you can switch to the activity monitor, and in the newly added "active resource-intensive Query" tab, you can see the time-consuming query that is currently active until the query finishes executing The principle of real-time query statistical information The rationale behind real-time query statistics is actually getting information through the

Label:Introduction to OLE DB Wait eventsThe OLE DB wait type is one of the most common wait types in a SQL SERVER database. It means that a session (SPID) has a call request through SQL Server Native Client OLE DB provider and waits for the database to return the required data. It appears in the remote system or the network connection is not fast enough, so the calling server must wait for the result to be returned. What do OLE DB wait events typically do with those activities? It is generally c

to be completely isolated, a bit of concurrency ...). Therefore, SQL Server's default read commited is a good choice to strike a balance between isolation and concurrency.SQL Server passes the lock, just like a traffic light at a crossroads, to tell all concurrent connections that at the same time those resources can be read and those resources can be modified. As mentioned earlier, the query itself is not a gentleman, so it needs to be supervised. When a transaction requires access to a resour

content in Chapter "lock and concurrency" in "Inside SQL Server 2005: The Storage Engine 8th" written by Kalen Delaney (see references in this book: other resources and references ). specifically, that chapter contains the required information about SQL Server 2005 transactions, isolation levels, locks, and other content required to solve concurrency issues. 1. new tools to solve concurrency Problems SQL Server 2005 adds some important new tools to solve concurrency problems. in addition to the