read lock

MySQL replication (1) bitsCN.com Compared with small sites, database administrators of large sites must do the following in advance: Provides a recovery plan for core business data in the event of a disaster. Theoretically, this process must be

The MySQL database lock mechanism works well in a table with frequent update and insert operations. in actual operation, because the data volume is large (0.21 million records ), A deadlock occurs. you can view the statement "show processlist". the

As an excellent non-memory database, HBase provides the same transactional concept as traditional databases, except that hbase transactions are row-level transactions that guarantee the atomicity, consistency, isolation, and durability of row-level

Database Backup is extremely important. If there is no backup, you will be crazy in the following situations: UPDATEorDELETEwhitoutwhere & hellip; tablewasDROPPedaccidentally & hellip; INNODBwascorrupt & hellip; entiredatacenterlosespower & helli

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 engine is INNODB. A typical page-level engine is BDB.A typical table-level engine is MyISAM, MEMORY, and

Document directory Before you get started with pthreads Pthread APIs Before you get started with pthreads Extends details in Multithreaded Applications will affect your interpretation of how the pthread APIs work.Multithreaded ApplicationsAlso

Beckham _ mysql table optimization and Beckham _ mysql OptimizationMysql table OptimizationBrief:I. analysis tableIi. ChecklistIii. Optimization tableIv. Table Data Import5. Table lock operationsI. analysis table 1.1. command: ANALYZE

Select an appropriate backup method for MySQL Backing up a MySQL database is extremely important. If there is no backup, the system will go crazy in the following situations:UPDATE or DELETE whitout where... Table was DROPPed accidentally... INNODB

Synchronized is a mutual exclusion lock;Lock is more extensive and includes read/write locksRead/write Lock features:1) Multiple readers can read at the same time2) The writer must be mutually exclusive (only one writer is allowed to write, nor does

1. Basic concept of File lockLinux software, hardware resources are files (all files), files in multi-user environment is shareable.File locks are a mechanism used to solve shared use of resources: When multiple users need to share a file, Linux

Shing Email: [Email protected] Blog: Http://blog.csdn.net/qifengzou Date: 2014.09.12 Reprint please indicate the CSDN blog from "Chifeng" 1 OverviewA system that contains multiple threads/processes will often have multiple

1, the effect and synchronized, can be executed synchronously, lock method to obtain the lock, unlock method release lockExamples of Use: Packagecom.test;ImportJava.util.concurrent.locks.Lock;ImportJava.util.concurrent.locks.ReentrantLock; Public

MySQL Tutorial database tutorial full backup and incremental backup strategy for backup recovery Backup strategy One: Copy database files directly (not recommended)Backup strategy Two: Use Mysqlhotcopy backup Database (full backup, suitable for

This article transferred from: http://www.cnblogs.com/dolphin0520/p/3923167.htmlIn Java, you can use the Synchronized keyword to implement synchronous access to shared variables between threads. From Java 1.5, there is another way to implement

Slow sql: Queries that run longer than a given time range are called slow queries.How do I record slow sql in MySQL?A: You can set the following information in MY.CNF: [Mysqld] ; Enable the slow query log, default

Session1: Mysql> Show create table T \g; 1. Row *************************** Table:t Create table:create Table ' t ' ( ' id ' int (one) DEFAULT NULL, ' Name ' char ' DEFAULT NULL ) Engine=innodb DEFAULT Charset=utf8 1 row in Set (0.00 sec)

Records lock record Locking Function: When a process is reading or modifying a part of a file, it can prevent other processes from modifying the same file area. BYTE range lock Byte-range locking Second, history Flock function, you can lock the

Why do we need a business?In the database (ii), the origin of the database we refer to the transaction.In addition to the database of queries and other operations are abstracted, another important function is the transaction . Why do we need a

MySQL Optimization Topic Development--Wang YaoyuFirst, SQL Optimized1. Analysis and positioning strategies1. Learn the frequency of SQL execution through show status2, location execution inefficient SQL statement: ① through slow log positioning; ②

Mysqldump backup principle mysqldump in the backup process, is to use the query to back up the relevant table data, and then export, stitching into the form of INSERT statements for backup.   about the--single-transaction