how to avoid deadlock in sql server

----------Create test table Declare @i int Set @i = 1 while @i - begin Insert intoTestlockSelect Right(Replicate('0',Ten)+ cast(@i as varchar(Ten)),Ten),'AAA','Fixchar' Set @i = @i+1 End Go----------Generate test Data View Code Code Deadlock Statement Declare @ID nvarchar(Ten) begin Tran Select Top 1 @ID =Id fromTestlock with(Updlock, Rowlock, Readpast)whereCol1= 'AAA' Order byIdASC Select @ID waitforDelay'00:00:20' UpdateTestlockSetCo

SQL Server Profiler Tool One, Introduction to SQL Profiler toolsSQL Profiler is a graphical interface and a set of system stored procedures that function as follows: Graphical monitoring of SQL Server queries; Collect query information in the background; Ana

Sometimes I see in programming forums, questions like: "My queries are failing with some chars, e.g. Quotes. How can I avoid it? ". And a common answer is: "replace it by double quotes ". wrong. this is only a workaround and will still fail with other chars, and will introduce serious security bugs. besides this, it will trash the SQL Server Caching System, whic

in a deadlock. Deadlocks are hard to find if the lock sequence is not designed in advance 46. Monitor the load Memory:page faults/sec counter of the appropriate hardware through SQL Server Performance Monitor If the value is occasionally higher, it indicates that the thread is competing for memory at that time. If it continues to be high, then memory can be a bo

If you are in charge of a SQLServer-based project or you have just been in touch with SQLServer, you may have to face some database performance problems, this article will provide you with some useful guidance (most of which can also be used for other DBMS ).? Here, I am not going to introduce how to use SQLServer, nor can I provide a package If you are in charge of a SQL Server-based project or you have ju

please write on the outside. such as: Begin TRAN Exec (@s) commits trans or writes dynamic SQL as a function or stored procedure.13, inQuery the number of rows returned with a WHERE clause in a SELECT statement, avoid table scan, if return unnecessary data, waste the server I/O resource, aggravate the burden of network reduce performance.If the table is large, l

, and any member of the group can access the database server, including any objects in your database to the group. SQL Server Authentication When you use SQL Server login for authentication, the client application needs to provide a valid username and password to connect t

If you are in charge of a SQLServer-based project or you have just been in touch with SQLServer, you may have to face some database performance problems, this article will provide you with some useful guidance (most of which can also be used for other DBMS ). If you are in charge of a SQL Server-based project or you have just been in touch with SQL

If you are in charge of a SQL Server-based project or you have just been in touch with SQL Server, you may have to face some database performance problems, this article will provide you with some useful guidance (most of which can also be used for other DBMS ). Here, I am not going to introduce the tips for using

If you are in charge of a SQL Server-based project, or you have just been in touch with SQL Server, you may have to face some database performance problems, this article Article It will provide you with some useful guidance (most of which can also be used for other DBMS ). Here, I am not going to introduce the tip

, this may lead to a deadlock. If the lock sequence is not designed in detail in advance, the deadlock is not easy to detect. 9. Do not open large datasetsA frequently asked question is: How can I quickly add 100000 records to ComboBox? This is not correct. You cannot or do this. It's easy. Your user needs to browse 100000 records to find the desired records, and he will curse you. Here, you need a better U

Precautions for SQL Server If you are in charge of a SQL Server-based project, or you have just been in touch with SQL Server, you may have to face some database performance problems, this articleArticleIt will provide you with

its shared lock on row 1. Transaction A cannot be completed after transaction B completes, but transaction B is blocked by transaction a. This condition is also referred to as a circular dependency: Transaction a relies on transaction B, and transaction B closes the loop by dependency on transaction A. Unless an external process disconnects a deadlock, the two transactions in the deadlock will wait indef

locks), and each transaction waits for another transaction to release the shared-mode lock.To avoid this potential deadlock problem, use an update lock (U lock).Only one transaction at a time can obtain an update lock (U Lock) for a resource. If the transaction modifies the resource, the update lock (U Lock) is converted to an exclusive lock (X lock).For example, when a record is queried, the update (UPDAT

the password of the Operating System Administrator. The command is as follows:Xp_regaddmultistring Xp_regdeletekey Xp_regdeletevalueXp_regenumvalues Xp_regread Xp_regremovemultistringXp_regwrite There are also some other extended stored procedures, and it is best to check. When processing the stored procedure, check to avoid damage to the database or application. 5. protocol encryption SQL

1. Grant necessory permission to the user account, so it can use SQL Profiler.Use masterGRANT ALTER TRACE to TEST;GRANT VIEW SERVER state to TEST;Use TestDBGRANT VIEW DATABASE state to TEST;GRANT SHOWPLAN to TEST; 2. SQL Server Computed Column Example create TABLE dbo. products ( ProductID int IDENTITY (+) not NU

transactions, but requires less overhead because fewer locks are needed to maintain. SQL Server can lock down the following resources (listed in order of increased granularity).Resource DescriptionThe RID line identifier. Used to lock a row in a table individually.The row lock in the KEY index. Used to protect the range of keys in a serializable transaction.PG 8,000-byte (KB) data page or index page.EXT a

Here, I'm not going to introduce the tips of using SQL Server, nor do I provide a panacea, and what I do is summarize some of the experience----about how to make a good design. These experiences come from the lessons I've endured over the years, and I've seen many of the same design mistakes repeated over and over again. First, understand the tools you use Don't underestimate this, this is the most impo

are converted to exclusive (X) locks, and each transaction waits for another transaction to release the shared-mode lock.To avoid this potential deadlock problem, use the update (U) lock. Only one transaction at a time can obtain an update (U) lock on the resource. If the transaction modifies the resource, the update (U) lock is converted to an exclusive (X) lock. Otherwise, the lock is converted to a shar

two transactions are converted to exclusive (X) locks, and each transaction waits for another transaction to release the shared-mode lock.To avoid this potential deadlock problem, use the update (U) lock. Only one transaction at a time can obtain an update (U) lock on the resource. If the transaction modifies the resource, the update (U) lock is converted to an exclusive (X) lock. Otherwise, the lock is co