locking bamboo

Optimistic lock (optimistic Locking) relative pessimistic lock, optimistic locking mechanism adopted a more relaxed locking mechanism. Pessimistic locking relies on the lock mechanism of the database in most cases, to ensure the maximum degree of exclusivity of the operation. But it comes with a lot of overhead for dat

In MySQL configuration file my.cnf, there is a one-line skip-external-locking parameter, which is "Skip external lock". According to the official explanation of the MySQL development website, external-locking is used for locking MyISAM data tables under multi-process conditions.If you have more than one server using the same database directory (not recommended),

Template and polymorphism strategy locking Keywords: strategized mode template strategized polymorphism strategized locking mode ace boost C ++ Design Mode There are a lot of strategized locking modes in ACE and boost implementations. This mode makes it easier for your class to be compatible with the locks and no locks. Ace master Douglas C. Schmidt has a speci

Explanation of MySQL performance parameters: Skip-External-Locking parameter introduction, mysqlskiplocking MySQL configuration file my. cnf contains a line of skip-external-locking parameters by default, that is, "skip external lock ". According to the official explanation of the MySQL development website, External-locking is used to lock the MyISAM data table u

4.2 strategized locking) 1. Problem Components running in multi-threaded environments must protect their critical section from concurrent access by clients. The integration of synchronization mechanisms and component functions requires the following two mandatory conditions: 1) different applicationsProgramDifferent synchronization policies may be required, such as mutex, read/write locks, or information lights. Therefore, you can customize the

This paper is mainly for mysql/innodb concurrency control and lock technology to do a more in-depth analysis, and related to the important concepts, such as multi-version concurrency control (MVCC), dirty Read (dirty read), Phantom Read (Phantom Read), The four isolation levels (isolation level) are described in detail, and a detailed analysis of MySQL's locking is based on a simple example. The summary of this article refers to the blog of Ho Dengche

Locking is a major part of the every RDBMS and is important to know about. It is a database functionality which without a multi-user environment could isn't work. The main problem of locking is, an essence it's a logical and not physical problem. This means, no amount of hardware would help you in the end. Yes you might cut execution times it's only a virtual fix. In a heavy multi-user environment any logic

Each object in Java has a built-in lock that automatically obtains the lock associated with the current instance (this instance) of the executing code class when the program runs to a non-static synchronized synchronization method. Acquiring a lock on an object is also known as acquiring a lock, locking an object, locking on an object, or synchronizing on an object.当程序运行到synchronized同步方法或代码块时才该对象锁才起作用。An ob

SynchronizedEach object in Java has a built-in lock that automatically obtains the lock associated with the current instance (this instance) of the executing code class when the program runs to a non-static synchronized synchronization method. Acquiring a lock on an object is also known as acquiring a lock, locking an object, locking on an object, or synchronizing on an object.当程序运行到synchronized同步方法或代码块时才该对

MySQL experience 10-2-lock bitsCN. comMySQL 10-2-lock 1. transactions in the InnoDB and BDB table environments have been introduced before the pseudo transactions. this is the only table type of ACID rule transactions that MySQL naturally supports. The old MySQL table types are still in use in many environments where MySQL is installed. they do not support transactions, but MySQL still allows you to implement original transactions through table locking