deadlock

问题 I need help solving a deadlock situation I'm facing. Thanks for your help. I think the deadlock is related to the SELECT subquery of transaction 2, but I don't understand several things: Why is it holding a S lock and then waiting for a X lock of the same row... why didn't it get an X lock to begin with? In any case, why is transaction 1 blocking anything? I would expect it to just need one lock, therefore not get a lock of anything else, and just wait until that lock is available to be

问题 I have a strange problem. A process gets frozen/stuck while reading data using System.Data.SqlClient.SqlDataReader on GetValue() function. I am analyzing the process dump using WinDbg. I used SOS commands like !dlk , !SyncBlk , !analyze -v -hang etc. but none of them indicate any deadlocks. The last call on callstack is 000000001a98e8a8 0000000076febd7a [InlinedCallFrame: 000000001a98e8a8] .**SNIReadSyncOverAsync**(SNI_ConnWrapper*, SNI_Packet**, Int32) 000000001a98e8a8 000007fee9e8bca1

问题 MySQL server seems to constantly lock up and stop responding on certain types of queries and eventually (after couple of minutes of not responding) give up with an error " MySQL server has gone away ", then hang again on the next set of queries, again and again. The server is set up as a slave to replicate from a master to dbA , mostly INSERT statements, around 5-10 rows per second. A PHP based application is running on the server that reads the freshly replicated data every 5-10 seconds,

来源： https://stackoverflow.com/questions/64573120/deadlock-in-embedded-tomcat-server

来源： https://stackoverflow.com/questions/64573120/deadlock-in-embedded-tomcat-server

来源： https://stackoverflow.com/questions/18996157/what-does-lock-communication-buffer-resources-mean

来源： https://stackoverflow.com/questions/37252753/automatically-kill-session-of-some-specific-task

来源： https://stackoverflow.com/questions/37252753/automatically-kill-session-of-some-specific-task

来源： https://stackoverflow.com/questions/37252753/automatically-kill-session-of-some-specific-task

来源： https://stackoverflow.com/questions/19015305/visual-studio-hangs-constantly-during-build