how to avoid deadlock in sql server

Deadlock Dead lock Exception Handling Exception handler Transaction and nested Transaction (nested) Index Best Practice Performance Optimization Classic SQL statements SQL Server Profile monitoring performance Execution Plan (reference) Usage of XML in SQL

Let's talk about the Views in SQL Server and SQL Server. 1. What is a view? 2. Why view; 3. order by in the view; 4. Refresh the view; 5. Update the view; 6. view options; 7. Index View; 1. What is a view? A view is a virtual table defined by a query. Unlike a physical table, the data in the view has no physical repres

Someone asked me how to capture and record the deadlock information on the Forum. Here, I will share some of my experiences with you, and I would like to ask you to correct them. We know that we can use the profiler tool provided by SQL Server to track deadlock information. However, this method has a big flaw, that is,

Tags: SQL Server optimizationAlthough the query speed is a lot of reasons, but if through a certain optimization, you can also make the query problem to a certain extent to be resolved.The reasons for the slow query are many, and the following are common: No index or index is not used (this is the most common problem of slow query, is the defect of program design) I/O throughput is small, creat

previously relational academic, the update lock is called an asymmetric lock (asymmetric lock). In the context of the update lock, this update lock is compatible with the shared lock, but vice versa: the shared lock is incompatible with the update lock. However, SQL Server does not implement shared locks as asymmetric locks. Update locks are symmetric (symmetric), meaning that update locks and shared locks

immediately. If the application does not extract all the result rows, the lock may stay on the table and block other users. If you use an application that transparently submits a Transact-SQL statement to the server, the application must extract all the result rows. If the application does not do this (if it cannot be configured to do so), the blocking problem may not be resolved. To

1.4 Automatic File growth and automatic contraction SQL Server allows you to set the initial value and maximum value of a database, which can automatically increase or contract. These settings can prevent application modification failures caused by database space problems or SQL Server from exhausting hard disk space.

Someone asked me how to capture and record the deadlock information on the Forum. Here, I will share some of my experiences with you, and I would like to ask you to correct them. We know that you can useSQLThe profiler tool provided by the server is used to track deadlock information. However, this method has a big flaw, that is, it consumes a lot. According to a

manner, and reasonably utilize parallel queries to greatly improve SQL Execution efficiency. In order to make good use of parallelism, you must pay attention to it when writing SQL statements to prevent parallel operations from being restrained and affecting the performance. SQL optimization is a difficult and repetitive process. Even so, it is a pleasure. In th

converted to the exclusive (X) lock, and each transaction waits for another transaction to release the share mode lock, a deadlock occurs. To avoid this potential deadlock problem, use the update (U) Lock. Only one transaction can obtain the resource Update (U) Lock at a time. If the transaction modifies the resource, the update (U) Lock is converted to the row

Start now.Here we can see the analysis after the success of the analysis report, this does not count, we click on the aboveRecommendations TabHere are the tables you need to optimize, how to build indexes and views to improve performance more effectively, more fun is even need to optimize the SQL statements are generated,We'll just copy and execute.To save a deadlock graph:To Save the

isolation level. 4) use the table-level locking prompt for select, insert, update, and delete statements. 5) configure the index lock Granularity You can use the sp_indexoption system stored procedure to set the locking granularity for indexes. 6. view the lock Information 1. Execute exec sp_lock to report lock information. 2. Press Ctrl + 2 in the query analyzer to view the lock information. Seven precautions How to avoid deadlocks