transaction and concurrency control

About Linux server traffic and Concurrency Control This article describes how to use the tc tool to implement advanced traffic control for Linux. The TC traffic control tool has been incorporated into the kernel since Linux2.2 and has very powerful functions. If you need to build a high-performance Linux gateway, this

When the static tool method is concurrent, you cannot simply use the synchronization keyword to synchronize the method, because the static method is a Class-level method and the lock is the class itself, the result is that any static synchronous method running will cause blocking of other synchronous method calls. This is also the problem. Here is a simple method to avoid this problem: By giving each method a lock to control

Class Class B Class C Scenario: Class A is nested, Class B is nested, and class C is nested. transactions are controlled by spring. Requirement: When Class C reports an exception, subsequent logical execution of Class A and Class B is not affected. Problem: Class C reports an exception. The subsequent logic of Class A and Class B can be executed, but the data is rolled back. Analysis: the preliminary analysis is: The Spring transaction

} - - Threadpool.shutdown (); - } -}In the code, although there are 30 threads executing, only 10 concurrent executions are allowed. The semaphore method Semaphore (int permits) accepts an integer number that represents the number of licenses available. Semaphore (10) indicates that 10 threads are allowed to obtain a license, that is, the maximum number of concurrent is 10. The use of semaphore is also simple, with the first thread using Semaphore's acquire () to obtain a license,

one, concurrency and stateConcurrency: Multi-CPU or single CPU multi-process multithreading simultaneous executionState: Simultaneous access to shared resourcesConcurrency occurs in the following 4 scenarios:(1) Multi-CPU(2) Single CPU multi-process multithreading(3) Single CPU process and interrupt(4) Single CPU interrupt and interruptsecond, process scheduling1. Process scheduling is scheduled according to the time slice, process A's time slice ran

JDBC transaction control and Batch Processing I. Transaction concepts and features 1. Transaction concept: refers to the unit of work for a group of atomic operations (execution of a group of SQL statements) 2. All atomic operations in this unit of work are isolated from other transactions during the execution period,

In ADO, you can use connection and transaction objects to control transactions. To perform a transaction, follow these steps: 1. Call the BeginTransaction method of the Connection object to mark the beginning of the transaction. 2. Assign the transaction object to

As we all know, Spring's transaction control is implemented based on AOP. A method that declares transaction management (such as a Service method) will be intercepted during execution, the "additional" operations executed during interception are concentrated in:Org. springframework. transaction. interceptor. Transactio

:13.0Can be seen, and the mutex effect is consistent.And this class of usage scenarios. I haven't figured it out for the moment. Why there is such a mechanism. As for the fair Semaphore and the non-fair semaphore, it is not demonstrated. It's very simple. You know what the difference between a mutex and a semaphore is.Another method of Acquire acquireuninterruptiblyIn fact, it is almost acquire (), the underlying or called the Tryacquireshared (Arg) method, which gets a license from thi

"+m_activethreadcount); } } } /// ///Processes the requests in the request queue. /// Private voidOnprocessrequestqueue (ObjectState ) { Lock(M_lock)//i.e. Monitor.Enter (M_lock) { while(true) { //Check if the queue is empty. while(M_queue. Count = =0) {M_activethreadcount--; //wait for a request. End the thread if no act

In the previous article, simple solution for pure JDBC transaction control under layered architecture, the transaction control when pure JDBC is used in layer-4 architecture applications is discussed, and a simple solution is provided, I received replies from many netizens. Some netizens should also see that when writi

I. Oracle transaction control:1. A series of operations that constitute a single logical unit of work are called transactions.2. Database Transaction composition:1. 0 ~ Multiple DML statements2. One DDL (Data Define Language) Statement3. One DCL (Data Control Language) Statement3.