deadlock

问题 My program appears to run in a deadlock sometimes when I hit Ctrl+C. I'm trying to catch the keyboard interrupt and gracefully stop all running threads, but I'm not quite there yet. I'm using a concurrent.futures.ThreadPoolExecutor . To find the location of the deadlock, I'm using the this receipe from ActiveState. Now, here's the full stacktrace: # ThreadID: 4856 File: "c:\users\niklas\appdata\local\programs\python\python36\lib\threading.py", line 884, in _bootstrap self._bootstrap_inner()

问题 We have a (currently InnoDB) table which contains roughly 500,000 rows. This represents a queue of tasks to run. It is stored in a MySQL database. An a continual basis, at least once per second but sometimes more frequently, we select data from it and subsequently update some rows. Once per day, we prune old rows from the table. We started getting deadlocks on the table and this brought our task processing to a standstill. These deadlocks were caused during the nightly prune run. The

问题 I am using SQL Server 2008 Enterprise. I met with issue which says line 9 of stored procedure foo is meeting with dead lock issue. My question is how to find exactly the 9th line of the stored procedure? My confusion is because of coding format issue, how to locate 9th line correctly. thanks in advance, George 回答1: It's the 9th line from the CREATE PROCEDURE statement. A SQL statement is often multiline so "line 9" will refer to the first line of the statement (eg INSERT or UPDATE) However,

问题 I'd like to kill threads that are stuck in deadlock state. First, we can detect thread ids in deadlock state using the findDeadlockedThreads() method of the ThreadMXBean class in java.lang.management . Then, I'd like to kill the threads by thread ids, and thus I have two related questions: (1) How to get the control of a thread by thread id? (2) How to kill a blocked thread? I think that invokting interrupt() method will give an exception to the thread and will kill the thread. 回答1: From the

问题 I have a C# project which writes data to a TSQL database. There are two update statements which run within a loop, eg.: for (int i = 0; i < customersProducts.Count; i++) { CustomerProducts c = customersProducts[i]; // Update product dimensions for (int j = 0; j < c.Count; j++) { Product p = c[j]; updateProductDimensions(p); } // ... some processing // Update product for (int j = 0; j < c.Count; j++) { Product p = c[j]; updateProduct(p); } } The updateProductDimensions() and updateProduct()

问题 From what i undertand it is impossible to completely prevent a transaction from deadlocking. I would like to have transaction that neverfail from the perpective of application code. So i have seen this pattern in use for Microsoft SQL and I wonder if this is a good idea? DECLARE @retry tinyint SET @retry = 5 WHILE @retry >0 BEGIN BEGIN TRANSACTION BEGIN TRY // do transaction her COMMIT BREAK END TRY BEGIN CATCH ROLLBACK if (ERROR_NUMBER() = 1205 OR ERROR_NUMBER() = 1222) BEGIN SET @retry =

问题 I'm writing a Python extension in C++, wrapping a third-party library I do not control. That library creates a thread Python knows nothing about, and from that thread, calls a C++ callback I provide to the library. I want that callback to call a Python function, but I get a deadlock using the approach I read from the docs. Here's my interpretation of those. void Wrapper::myCallback() { PyGILState_STATE gstate=PyGILState_Ensure(); PyObject *result=PyObject_CallMethod(_pyObj,"callback",nullptr)

问题 Occasionally, I have the following error for a stored procedure which is only a Select query: Transaction (Process ID 91) was deadlocked on lock My initial understanding was that a select query won't lock a table, or won't cause a deadlock even if the table it tries to query is being updated/locked by another process, but it seems that a select query can cause deadlocks as well. If I set the isolation level to read uncommitted for the query, will that solve the problem? 回答1: My init

问题 I have a C# application which is inserting data into SQL Server (2008) table using stored procedure. I am using multi-threading to do this. The stored procedure is being called from inside the thread. Now my stored procedure is using "tablock" while inserting data. While executing this code I am getting the following error: "Transaction (Process ID) was deadlocked on lock resources with another process and has been chosen as the deadlock victim. Rerun the transaction." Can anyone please help

问题 I have an issue with table locking in InnoDB on delete operation. I have a table queue with for example one column and a lot of transactions which can insert rows into this queue or delete them. There isn't any two transactions working with the same rows at the same time. So, all row locks must be distinct. But sometimes when delete operation deletes the most part of rows in the table, InnoDB prefers to use table lock instead of row lock and that causes deadlocks. I can't reproduce this