deadlock

问题 I need to do this in order to solve a deadlock. My Windows Forms Control has a reference to a C++/CLI class which wraps a C++ native class. The native class makes callbacks to the C++/CLI class, which maps them to events handled by the form. These callbacks are called from a thread which runs all the time. When I want to dispose the control, I unregister all events, so that the native class can't call back anymore. Once that's done, I dispose the C++/CLI wrapper, which in turn destroys the

问题 I'm having a strange problem with new Entity Framework for .NET 4 I have a SQL Server 2005 (EXPRESS) database and my service writes data to two tables using entity framework. Let's say tables are TableA and TableB. TableB has foreign key to TableA. In my program there are several threads that writes data in parallel. Each thread has its own ObjectContext. The program creats TableA object and puts it in the object context. Then objects for TableB are created and put to object context. This

问题 On Mysql (Amazon RDS), when I try to run the following SQL query UPDATE table1 INNER JOIN table2 USING (CommonColumn) SET table1.col1 = table2.x, table1.col2 = table2.y I get this error after around 52 seconds consistently: Error Code: 1205. Lock wait timeout exceeded; try restarting transaction How should I resolve this? table2 has around 17 million records and table2 which is a subset of table1 has 4 million records. Could it be the size of the tables that is the problem or is something

问题 I have the following table CREATE TABLE IF NOT EXISTS `task` ( `id` int(10) unsigned NOT NULL AUTO_INCREMENT, `job_id` int(10) unsigned NOT NULL COMMENT 'The id of the related job', `server_id` tinyint(4) NOT NULL DEFAULT '0' COMMENT 'job/task owner', `jobtype_id` int(10) unsigned NOT NULL DEFAULT '0', `node_id` int(10) unsigned NOT NULL COMMENT 'The id of the user currently executing this task', `status` enum('QUEUED','EXECUTING','COMPLETED','CANCELED','TERMINATED','PAUSED','FAILED') NOT

问题 I have a problem with the following query: SELECT o.OID, o.DOSSIER_KEY, o.DOSSIER_TYPE FROM TVM04_VMAX_TEMP_RIGHTS WHERE o.DOSSIER_KEY = ? AND o.DOSSIER_TYPE = ? FOR UPDATE it keeps causing a deadlock even though it is repeated more times at different intervals. If I have understood how a deadlock happens, I would expect that one of the two colliding sessions is rollbacked and the other goes forward (here) I get indeed a Internal Exception: java.sql.SQLException: ORA-00060: deadlock detected

问题 Here I saw JavaScript deadlocks and this code: var loop = true, block = setTimeout(function(){loop = false}, 1); while(loop); It's definitely infinite loop and causes to browser freezing. It's said that deadlock is created when one operation wait another one to be executed and vice-versa . My question is, except that, what kind of situations deadlock occurs and the ways to avoid them? 回答1: That's not a deadlock, just an infinite loop, you can't have a deadlock in JavaScript as you can't have

问题 I am trying to understand how deadlocks are created. I've understood that by using two threads on two synchronized methods, a deadlock can be created. Went through many examples from the net. Can a deadlock be created with wait and notify? Every time a thread is on wait, it will be notified. So how does this end up in a deadlock? Illustration of an example will be helpful. 回答1: Deadlock is caused when two threads try to obtain the same, multiple locks in different order: // T1 synchronized (A

问题 My app needs to load plugins into separate app domains and then execute some code inside of them asynchronously. I've written some code to wrap Task in marshallable types: static class RemoteTask { public static async Task<T> ClientComplete<T>(RemoteTask<T> remoteTask, CancellationToken cancellationToken) { T result; using (cancellationToken.Register(remoteTask.Cancel)) { RemoteTaskCompletionSource<T> tcs = new RemoteTaskCompletionSource<T>(); remoteTask.Complete(tcs); result = await tcs.Task

问题 I got this error when running a procedure I would like to know if it is possible to see the trace file on the server about the details 回答1: You can find such informations in the alert<your_sid>.log file. By <your_sid> , i mean the value when you issue $ echo $ORACLE_SID ( mostly set as this ). It's under $ORACLE_BASE/diag/rdbms/<your_sid>/<your_sid>/trace path location. You may also see the value for base path by issuing $ echo $ORACLE_BASE ( or alternatively, you would keep under $ORACLE

问题 I am facing a deadlock in my MySQL. How can I configure MySQL to restart the transaction automatically when it encounters a deadlock? 回答1: You cannot do that automatically, as the deadlock occurred, because two transactions were trying to modify the same data . If you know that simply retrying the same statements again will be the right thing to do, you need to implement this in your application. However having the database do that automatically would be irresponsible, because there might