how to resolve deadlock in sql server

From: http://atkins.5d6d.com/viewthread.php? Tid = 6847 Analyze and solve the SQL Server deadlock problem Deadlock. In short, two or more trans simultaneously request an object being requested by the other party, causing both parties to wait for each other. A simple example is as follows: Trans1 trans2 -----------

2. What factors do you think will affect SQL Server efficiency in writing T-SQL (including stored procedures, functions, and views? Summary-index usage L no index, no index used, low I/O throughput, no computing column created, resulting in query optimization, lock or deadlock, insufficient query statement optimization

resources, and vice versa. When a deadlock occurs, one of the parties is required to win the fight, so SQL Server chooses a deadlock victim, rolls back the transaction for the deadlock victim, and notifies a deadlock that a 1205

, you do not allow any other transaction to manipulate the resource until the exclusive lock is released, preventing multiple operations on the same resource at the same time. Update Lock (U): Prevent deadlock in the lock mode, two transactions to a data resource read first in the case of modification, use of shared and exclusive locks sometimes deadlock phenomenon, and the use of update locks can avoid

-sql Server uses the following resource lock modes.Lock mode descriptionShares (S) are used for operations that do not change or do not update data (read-only operations), such as a SELECT statement.Update (U) is used in updatable resources. Prevents a common form of deadlock that occurs when multiple sessions are reading, locking, and subsequent resource updates

set transfer location.9. Click Next To go to the set Merge Agent schedule screen. The setting of this screen is similar to the setting of the distributing agent schedule in Chapter 27th. You can select the appropriate option by referring to the previous setting logic.10. Click Next To Go To The subscription priority setting screen, as shown in 28-13. Priority indicates which subscription sets are considered as priority when a conflict occurs. The preset setting (also recommended) specifies that

needs to be restarted. in Object Explorer, right-click your server, and then click Restart. If you run a SQL Server agent, you must also restart the agent. Enable the SA logon nameEnable the SA logon name "security" , "login name", Right-click "sa" , then click . page, You may need to create a password for the login and confirm the pass

the deadlock, whether we have deadlock-causing performance problems in the application.Step 1:Right-select "Properties" on the previous "Deadlock_monitor" session. Select the Events page to add the Lock_deadlock and Lock_deadlock_chain event classes to the right-selected event list.650) this.width=650; "title=" clip_image014 "style=" Border-top:0px;border-right:0px;border-bottom:0px;border-left : 0px; "alt

Tags: key foreign ADL CLI data function return ESS codeTurn from: 19498327 How do I capture and record deadlocks that occur in SQL Server?How SQL Server makes the error log record deadlock February 19, 2014 18:25:55 Hits: 1313 We know that you can use the Profiler tool that

fight, so SQL Server chooses a deadlock victim, rolls back the transaction for the deadlock victim, and notifies a deadlock that a 1205 error has occurred. Another transaction will continue to run normally.　　1, the way to judge the deadlockEvery 5 seconds,

Method 1: Use the SQL Server proxy (Alert + Job)The procedure is as follows:1. First, use the following command to enable the trace flag.SQL codeDbcc traceon (3605, 1204, 1222,-1)Note:3605 output the result of DBCC to the error log.1204 return the resources and types of the locks involved in the deadlock and the affected current commands.1222 return the resources

Method 1: Use the SQL Server proxy (Alert + Job)The procedure is as follows:1. First, use the following command to enable the trace flag.SQL codeDbcc traceon (3605, 1204, 1222,-1)Note:3605 output the result of DBCC to the error log.1204 return the resources and types of the locks involved in the deadlock and the affected current commands.1222 return the resources

Label:In today's article I would like to talk about the more advanced, lightweight synchronization objects that SQL Server uses: latches (Latch). A latch is a lightweight synchronization object used by the SQL Server storage engine to protect multi-threaded access in-memory structures. Part 1th of the article I'll show

. From the perspective of troubleshooting, it is very useful to understand these methods, because it helps you to resolve connection-related problems to a specific data access layer or database. Client Net-Library The next layer in the stack is Net-Library. Net-Library provides a channel between the API or object Library (the application uses it to communicate with SQL