read lock

1,myisam on disk, store the data as 3 files. The first is a table structure file whose name starts with the name of the table, the. frm file, the second file is a data file with a. MYD extension, and the third is an index file with an extension of.

Mysql backup classification:Mysql Data Backup:Logical backup and physical backupMysql is classified by Dataset:Full backupIncremental BackupDifferential backupThese types are generally used in combination. For example, full backup can be performed

If you run the table check/repair program at the same time, you may not wantMySQLThe server and utility access a table at the same time. If both programs write data to the table, it will obviously cause a lot of trouble and even cause unexpected

1 Overview InnoDB automatically detects deadlocks. If a deadlock occurs, InnoDB rolls back the transaction with a relatively small weight. In fact, there are two types of deadlocks in InnoDB: Real inter-transaction cyclic wait. During

Source of this article: http://www.lustlost.com /? P = 101 Mysql supports logical backup and physical backup Based on Backup recovery methods. Logical backup is a backup SQL statement. The backup SQL statement is executed during restoration to

Namespace Consoleapplication22{ Class Program{ Static Void Main ( String [] ARGs){Thread [] TS = New Thread [ 30 ];Testdemo TD = New Testdemo (); Int I; For (I = 0 ; I 30 ; I ++ ){TS [I] = New Thread

MySQL Backup recovery based on LVM Snapshot Directory1. Full database backup2. Prepare LVM volumes3. Data Recovery to LVM volumes4. Back up data based on LVM snapshots5. Data Disaster Recovery6. Summary Preface:The mysql 5.5.36 database is installed

Java concurrent development: Lock framework details, javalockAbstract: We already know that synchronized is a keyword of java and a built-in feature of Java. At the JVM level, it achieves synchronous and mutually exclusive access to critical

If you run the check/fix for the table at the same time, you may not want the MySQL server and utility to access a table at the same time. If all two programs write data to a table, it's obviously a big hassle, and even unexpected things happen. If

MySQL lock table Overview 1. for MySQL, there are three lock levels: page level, table level, row level A typical page-level engine is BDB. A typical table-level engine is MyISAM, MEMORY, and ISAM, which was a long time ago. A typical line-level

I. MySQL locks the MyISAM and MEMORY engines to implement row-table locks, the BDB storage engine to implement page-level locks, and the InnDB storage engine to implement row-level locks. Granularity: from large to small (MySQL only supports

Mysql Tutorial: summary of the lock mechanism in MySQL. let's briefly summarize the lock mechanism in MySQL today. if you are not interested, click it! 1. for MySQL, there are three lock levels: Page-level, table-level, and RoW-level. A typical

MySQL master-slave synchronization settings and synchronization error handling Note: 1. The database versions of the two servers should be the same. If they are different, the slave server version should be higher than the master server version. 2.

And the objects modified by synchronized can be accessed by only one thread at a time, the Readwritelock interface provides a finer-grained locking mechanism. Readwritelock maintains a pair of related locks, one for read-only operations and the

Java multithreading and Multithreading1. Differences between a thread and a process 1.1 thread and a process A process is an independent space in the memory and can be used to run the current application. The current process schedules all running

Read-Write Lock Reentrantreadwritelock OverviewA very important piece of content in a large web site is the reading and writing of data, although Reentrantlock has a completely mutually exclusive effect (that is, only one thread is performing the

Preface: Starting from this chapter, we start to enter the SQLite kernel. In order to better understand SQLite, I will first discuss the kernel from the overall structure. It is very important to grasp SQLite from the global perspective. SQLite

1. Multiple threads accessing multiple objects The JVM creates multiple locks.2. Static methods are synchronized in the same class-for all static methods in the same class, only one thread is allowed to execute one of the static methods at the same

First, the preface Borrowing Java concurrent programming practice "It's not easy to write the right program, it's even harder to write a normal concurrency program," The multithreaded thread-safety problem is subtle and unexpected compared to

Mysql 6.4 Setting Sync The following describes how to quickly set up a MySQL synchronization server. Suppose you intend to synchronize all the databases and have not been set before. The master server needs to be shut down to complete all the