sql deadlock victim

, deadlocks are prone to the following situations:● Different stored procedures, triggers, and dynamic SQL statement segments Access Multiple tables in different order at the same time;● A table with frequent records is added during the exchange, but non-cluster indexes (non-clustered) are used for the table );● The number of records in the table is small, and a single record is short, so the Access frequency is high;● The whole table is frequently ac

system, deadlocks are prone to the following situations:● Different stored procedures, triggers, and dynamic SQL statement segments Access Multiple tables in different order at the same time;● A table with frequent records is added during the exchange, but non-cluster indexes (non-clustered) are used for the table );● The number of records in the table is small, and a single record is short, so the Access frequency is high;● The whole table is freque

correct, should every request error Ah, now is dozens of times only one or two times the error, certainly not this reason.Search on the internet for half a day, no fruit, so put the code on the server to simulate concurrent testing, or there will be one or two times the error, but the report of the error is very clear# # # Error QueryingDatabase. Cause:com.microsoft.sqlserver.jdbc.SQLServerException: Transaction (Process ID +) is deadlocked with another process on the lock resource and has been

Note: The transaction (process ID 56) and another process are deadlocked. | the communication buffer zone resource has been selected as the deadlock victim ., Note as dead An exception occurred during SQL concurrent UPDATE today: (the Code is as follows) // Parallel class can generate concurrent operations (that is, multithreading) Parallel. forEach (topics, to

An exception was encountered today when doing SQL Concurrency update: (Code below)// Parallel class can produce concurrent operations (i.e. multithreading) Parallel.ForEach (topics, topic ={ //DBHelper is a encapsulated database operation class, the following line of code executes the UPDATE statement "topicid=" + topic. TOPICID);});This problem occurs because, in SQL Server by default, an

execution of transactions/// Public classeftransaction:idisposable {Private ReadOnly Static Object_mylock =New Object(); /// ///Current Transaction Object/// PrivateTransactionScope Tran =NULL; Publiceftransaction () {monitor.enter (_mylock);//Get exclusive lock This. Tran =NewTransactionScope (); } /// ///Submit/// Public voidCommit () {tran.complete (); } /// ///Roll -back operation, automatic call rollback in Dispose ()/// Public vo

deadlock View deadlocks through profiler Another method is to enable profiler to capture the deadlock information captured by Profiler, which is more intuitive, as shown in profiler setting 6. Figure 6. settings of the deadlock graph in profiler Figure 7 shows the deadlock. Figure 7.

, when a deadlock occurs, you can see the relevant record from the log, as shown in 5.Figure 5: Post-deadlock recordCheck the look dead lock through the profiler.Another method is to open the profiler to capture, the profiler captures the deadlock information content is more intuitive, profiler settings 6.Figure 6. Setting of lock diagram in ProfilerThe captured

. Turn on 1222 This trace Flag for all session In addition to code 1, you can also –t1222 the add-on parameter before starting the SQL Server instance. This is no longer a detail. At this point, when a deadlock occurs, you can see the relevant record from the log, as shown in 5. Figure 5: Post-deadlock record Check the look dead lock through the profiler. Anothe

( Select flag = ' Deadlock process ', Spid,kpid,a.blocked,dbid,uid,loginame,cpu,login_time,open_tran, Status,hostname,program_name,hostprocess,nt_domain,net_address, S1=a.spid,s2=0 From Master.. sysprocesses a Join ( Select blocked from master. sysprocesses GROUP by blocked ) b on a.spid=b.blocked where a.blocked=0 UNION ALL Select ' |_ victim _> ', Spid,kpid,blocked,dbid,uid,loginame,cpu,login_t

point, when a deadlock occurs, you can see the relevant record from the log, as shown in 5.Figure 5: Post-deadlock recordCheck the look dead lock through the profiler.Another method is to open the profiler to capture, the profiler captures the deadlock information content is more intuitive, profiler settings 6.Figure 6. Setting of lock diagram in ProfilerThe cap

exceeded. (3). There is a lock monitor thread inside SQL server that performs a deadlock check that identifies the resource that the thread is waiting for when the lock monitor initiates a deadlock search for a particular thread, then locates the owner of a specific resource and recursively resumes the deadlock searc

thread performs deadlock checking, when the lock monitor initiates a deadlock search for a particular thread, it identifies the resource that the thread is waiting for, then finds the owner of the specific resource and recursively resumes the deadlock search for those threads until it finds a loop that constitutes a deadlock