open lock file

Before doing a test, repeatedly executed several times, found the result is the same:1. Single-threaded synchronized is the most efficient (at the time it felt its efficiency should be the worst);2. Atomicinteger efficiency is the most unstable,

Comparison of concurrency control (LOCK) between DB2 and Oracle Comparison of concurrency control (LOCK) between DB2 and Oracle 1 Introduction The minimal recovery and transaction units in relational databases (DB2, Oracle, Sybase, Informix, and

1 Introduction The minimal recovery and transaction units in relational databases (DB2, Oracle, Sybase, Informix, and SQL Server) are a transaction (Transactions). Transactions are ACID (atomicity, consistency, isolation, and durability) feature. In

One, what is file lockFor the word lock, we must not be unfamiliar, because we live in a large number of locks, they play its role in all aspects of the world, now the function of the lock can be summed up as a sentence, is to prevent some people do

First, the summary database locking mechanism is simply, the database in order to ensure the consistency of data, and so that the various shared resources in the concurrent access to become orderly design of a rule.For any kind of database need to

7.2 File Lock This is a file lock for Linux and the code is downloaded in the file lock code. File locking is a very important part of a multi-user, multitasking operating system.programs often need to share data, which is usually done through a

Refer to the differences between FCNTL (), LOCKF, flock in LinuxWhat is the difference between these three functions , which are all about locking up a file?First flock and fcntl are system calls, and LOCKF is a library function . LOCKF is actually

the main reference to the http://blog.csdn.net/anonymalias/article/details/9197641 (anonymalias column) A record lock is an extended type of read-write lock in thread synchronization and can be used to synchronize file reading and writing with a

Auth:jindate:20140506The main reference to organize informationMySQL performance tuning and architecture design-seventh MySQL locking mechanismHttp://www.cnblogs.com/ggjucheng/archive/2012/11/14/2770445.htmlUnderstanding mysql--Architecture and

PHP program in the file lock, mutex, read and write the use of skills analysis, File lockFull name advisory file lock, which is mentioned in the book. This type of lock is more common, such as MySQL, after php-fpm boot, there will be a PID file