mysql deadlock

exclusive lock to the clustered index, and session two waits for the session to release the exclusive lockIt's a dead lock at this time.650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M02/4D/79/wKioL1RR4Fnh5c3oAAFwBM-pgMU980.jpg "title=" 4.jpg " alt= "Wkiol1rr4fnh5c3oaafwbm-pgmu980.jpg"/>Solution:Scenario One: Do not let session two access the clustered indexThen you need to modify the nonclustered create unique nonclustered index Inx_nlcs on Testklup (Nlskey) include (CONT2,CONT1)Scenar

1. Critical Area problem of Process Synchronization and Peterson Algorithm 2. semaphore mechanism (pv operation) for Process Synchronization and three typical synchronization problems This article introduces many issues of process synchronization in process management. The following describes the deadlock issues in process management and their solutions.1. What is a deadlock? In a multi-channel programming

1--Deadlock problem location and resolution 2 3-in order to resolve a deadlock problem, the SQL Server Database engine deadlock monitor periodically checks for a deadlock task 4--If the monitor detects this dependency cycle relationship, it chooses one of the tasks as the victim, then 5--terminates its transaction and

: Database deadlocks are problems that are frequently encountered by transactional databases such as SQL Server, MySQL, and so on. Unless the database deadlock problem occurs frequently causing the user to be unable to operate, the database deadlock problem is generally not serious. You can do try-catch in the application. So how is data

Pt-config-diffCompare MySQL configuration files and server parametersExample:PT-CONFIG-DIFF/ETC/MY.CNF h=192.168.53.11--user=root--password=123456--socket=/tmp/mysql.sockpt-config-dirr/etc /my.cnf/etc/my_slave.cnfThe contents are as follows:21configdifferencesvariable /etc/my.cnf m11============================= ==============================================event_scheduler OFF onexpire_logs_ days21 14innodb_io_capacity1200 800innodb_max_dirty_pages.

Oracle Deadlock Analysis About 3 ways to deal with deadlocks 1. Forecast beforehand 2. Resource Grading 3, after the release of Detection I know that Oracle MySQL is a third type of line lock level. This analysis of an Oracle deadlock, first a deadlock will certainly generate a trace file, where a lot of informat

I. Causes and conditions of deadlock1. The concept of deadlockin general, if the same thread calls lock two times, at the first call, because the lock is already occupied, the thread suspends waiting for the other thread to release the lock, but the lock is occupied by itself, the thread is suspended, there is no chance to release the lock, and therefore, it is always suspended waiting, which is called a deadlock (

(Lmode))Mode_held, DECODE (REQUEST, 0, ' None ', 1, ' Null ', 2, ' Row-s (SS) ', 3, ' Row-x (SX) ', 4, ' Share ', 5, ' S/row-x (SSX) ', 6, ' EXC Lusive ', To_char (REQUEST))mode_requested, o.ccbzzp| | '. ' | | o.object_name| | ' (' | | o.object_type| | ') ', S.type Lock_type, L.id1 lock_id1, L.id2 Lock_id2From V$lock L, SYS. Dba_objects O, v$session S WHERE l.sid = s.sid and l.id1 = o.object_id;--How do I unlock it?ALTER SYSTEM KILL SESSION ' sid,serir# ';--

First, the concept of deadlock:　　1, the phenomenon of deadlock description:　　　　In many applications, a process is required to access several resources, rather than one, in an exclusive way. For example, two processes are prepared to record scanned documents to a CD, respectively. Process a requests that the scanner be used,and is authorized to use. However, Process B first requests a CD burner and is also a

1. Deadlock PrincipleAccording to the definition in the operating system: A deadlock is a permanent wait state in which each process in a set of processes occupies a resource that is not freed, but is placed in a form that is not freed by other processes.The four necessary conditions for a deadlock:Mutex condition (Mutual exclusion): A resource cannot be shared and can only be used by one process.Request an

Label:SQL Server Deadlock Summary1. Deadlock Principle According to the definition in the operating system: A deadlock is a permanent wait state in which each process in a set of processes occupies a resource that is not freed, but is placed in a form that is not freed by other processes. The four necessary conditions for a deadlock:Mutex condition (Mutual exclus

Tags: force contain sys user ACL SSI session keyword establishedCauses and solutions for common deadlock occurrences in Oracle One, the deadlock caused between the deletion and the update The cause of the deadlock is the scramble or interdependence of multiple threads or processes against the same resource. Here is a list of instances where a scramble for the sam

What is a deadlock when two (or more) Users wait for each other's locked resources, a deadlock will occur (deadlock ). A deadlock will cause the execution of related transactions to stop. Demonstrate two transactions that generate deadlocks ., At time point A, both transactions obtain the lock on the Data row required

1. Deadlock PrincipleAccording to the definition in the operating system: A deadlock is a permanent wait state in which each process in a set of processes occupies a resource that is not freed, but is placed in a form that is not freed by other processes.The four necessary conditions for a deadlock:Mutex condition (Mutual exclusion): A resource cannot be shared and can only be used by one process.Request an

Tags: style blog http io os using AR strong forTransferred from: http://blog.csdn.net/eseaqyq/article/details/7795023————————————————————————————————————————————————————Speaking of the deadlock in the data, has been repeatedly encountered in the written questions. Today is a summary of the database deadlock, abortions, roar!First, let's look at a few definitions: 1. Dea