read lock

In order to better optimize MySQL in high concurrency, it is necessary to understand the locking table mechanism when MySQL query is updated.I. OverviewMySQL has three levels of Lock: page level, table level, row level.The MyISAM and memory storage

This is a creation in Article, where the information may have evolved or changed. package mainimport ("fmt""runtime""sync")type Counter struct {mu sync.Mutexx int64}func (c *Counter) Inc() {c.mu.Lock()defer c.mu.Unlock()c.x++}func main()

Obtain orderThis class does not impose priority on the reader or writer for the sorting of locked access. However, it does support optional fairness policies. When a thread is constructed fairly, the thread uses an approximate sequential strategy to

MySQL lock usage-table-level lock bitsCN.com MySQL lock usage-table-level lock mechanism is an important feature of a database that is different from the file system and an effective way to manage concurrent access. MySQL locks include table-level

Java Concurrent Programming CombatThe Fork/join framework is a framework that JDK7 provides for parallel execution of tasks, a framework that divides large tasks into parallel execution of subtasks, and ultimately summarizes each small task to get

1. Mutual exclusion Lock (volume) and condition variableBy default, mutexes and condition variables are used for inter-thread synchronization, and can be used for inter-process synchronization if they are placed in a shared memory area.1.1 Mutual

The following experiments are only performed in MYSQL 5.0.45. Method 1: Use the mysql command to lock the table. Public VoidTest (){ String SQL ="Lock tables aa1 write"; // Or String SQL = "lock tables aa1 read "; // If you want to lock

One of the biggest challenges for developing multi-user database applications is to strive for the maximum concurrent access while ensuring that each user can read and modify data in a consistent manner. The maximum number of concurrent accesses

6.4 set Synchronization The following describes how to quickly set up a MySQL synchronization server. Suppose you want to synchronize all the databases, and you have not set them before. You need to disable the master server to complete all the

Read-Write Lock interface: Readwritelock, its specific implementation class is: ReentrantreadwritelockUsage scenarios:For a resource, reading can coexist, read and write cannot coexist, and write cannot coexist.Lock downgrade: Change from write lock

First, the principle of reproduction MySQL replication tracks all changes to the database (update, delete, and so on) based on the primary server in the binary log. Each receive from the server from the primary server has been logged to the saved

Original address: http://www.cnblogs.com/RicCC/archive/2009/09/25/mysql.htmlStorage Engine Attribute MyISAM Heap BDB InnoDB Transactions No No Yes Yes Lock

Start transaction, commit, and rollback syntaxStart transaction | begin [work] commit [work] [and [no] chain] [[no] release] rollback [work] [and [no] chain] [[no] release] set autocommit = {0 | 1} start transaction or begin statement can start a

MySQL lock usage-table-level lock mechanism is an important feature of a database that is different from the file system and an effective way to manage concurrent access. MySQL locks include table-level locks, page-level locks, and row-level locks.

One of the biggest challenges for developing multi-user database applications is to strive for the maximum concurrent access while ensuring that each user can read and modify data in a consistent manner. One of the biggest challenges for developing

ArticleDirectory In multi-threaded programming, developers often encounter multiple threads to read and write a resource. This requires thread synchronization to ensure thread security. In general, our synchronization method is to use the

This is a creation in Article, where the information may have evolved or changed. NSQ Source Learning Brief introduction NSQ is a distributed queue implemented with the go language. Read the source of the Chanel of the Go language, distributed has a

MySQL manual version 5.0.20-MySQL synchronization (II) 6.4 set synchronization The following describes how to quickly set up a MySQL synchronization server. Suppose you want to synchronize all the databases, and you have not set them before. You

This article can be used as a learning note for the Zhang Xiaoxiang-java multi-threading and concurrency Library advanced application.In this section we do a caching system.Before reading the festivalPlease read firstReentrantreadwritelock use of

1. OverviewIf you read Java's source code, the most common code authors include: Doug Lea, Mark Reinhold, Josh Bloch, Arthur van Hoff, Neal Gafter, Pavani Diwanji, and more. The basic of the Java.util.concurrent package is Doug Lea's name. Doug Lea,