read lock

This article gives you the content is about the MySQL database lock mechanism of the detailed introduction, there is a certain reference value, the need for friends can refer to, I hope you have some help. Pessimistic lock and optimistic

Each storage engine uses three types of locking mechanisms: row-level locking, table-level lock page-level locking. Table-level locking is mainly MyISAM, memory, CSV and other non-transactional storage engines, using row-level locking is mainly the

Lockan overviewThe database locking mechanism simply means that the database is designed to ensure the consistency of the data and to make the various shared resources become orderly by concurrent access. A corresponding locking mechanism is

MySQL's locking mechanism is relatively simple, the most notable feature is that different storage engines support different locking mechanisms. InnoDB supports row locks and sometimes upgrades to table locks; MyISAM only supports table locks.Table

#一. OverviewThe > database locking mechanism simply means that the database is designed to ensure the consistency of the data and to make the various shared resources be ordered by concurrent access. For any kind of database need to have a

Classification of LocksFrom the type of data (read \ Write) points:1. Read lock (Shared lock): For the same data, multiple read operations can be performed simultaneously without affecting each other2. Write lock (Exclusive lock): Before the current

The design and function of each module of SQLite kernel is grasped from the global angle. SQLite uses a hierarchical, modular design that makes it highly scalable and portable. Moreover, the architecture of SQLite is not very different from the

In the MySQL database, both the read-only state and the Master-slave settings and relationships are involved in data migration and read-only state settings from the library. after practical testing, for MySQL single-instance database and master

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

In the MySQL database, both the read-only state and the Master-slave settings and relationships are involved in data migration and read-only state settings from the library.After practical testing, for MySQL single-instance database and master

MySQL's lock mechanism is relatively simple, and its most notable feature is that different storage engines support different locking mechanisms. For example, the MyISAM and memory storage enginesA table-level lock is used, the BDB storage engine

MySQL in the use of the process encountered slow access, or can not respond to such problems, the solution is basically a formula, the general first reaction will be logged in to MySQL, show processlist see the current connection status.Although

1. Logical backup A logical backup in MySQL is to back up the data in the database as a text file, and this text file can be viewed and edited mysqldump[[Email protected]~]# mysqldumpusage:mysqldump [OPTIONS] database [tables]OR mysqldump

Basic and Control PrimitivesRead/write LockSimilar to mutex, but read-write locks allow for higher parallelism. Its characteristics are: Write exclusive, read share.Read-Write lock status:A read-write lock has three states:1. Lock status in read

No one likes syncing code, which lowers performance metrics like your app's throughput, and hangs up in the worst of times, but even then you don't have much choice.Many theories and patterns to achieve multi-threaded synchronization access to a

  Lock is more object-oriented than synchronized in the traditional threading model, and locks, like locks in life, should also be an object. Code snippets executed by two threads to achieve the effect of synchronizing mutexes, they must use the

MySQL lock mechanism is divided into table-level lock and row-level lock table-level lock to the entire table back lock, write lock or read lock (Unlock tables)LOCK TABLE table_name [as Alias_name] READRelease the lock using unlock tables. Aliases

First, meaningIn a database management system, transactions need to meet acid four features.Atomicity, or atomicity, indicates that all operations within a transaction are either done entirely or not.Consistency, which is consistent, indicates that

Http://blog.sina.com.cn/s/blog_616b428f010163bo.htmlA transaction (transaction) is the execution unit of a database management system, either a database operation (such as a select operation) or a set of sequence of operations. Transaction acid

Want to see the forum and all of the blog on the MySQL all over, death hit the endSee something about a database snapshot .... Don't understand, Baidu ... Then on the topic, see the table lock this thing unlock tables;Used to lock the table