mysql innodb

Because the InnoDB preset is Row-level lock, MySQL executes row lock (only the selected data sample) only if the specified primary key is "clear", otherwise MySQL will execute table lock (lock the entire data form). For example: Suppose there is a

ObjectiveAny system needs to focus on the production environment error log at any stage, and in recent months, it has been discovered that there are occasional database deadlock situations. Previously encountered the database class errors are mostly

Architecture of MySQL DatabaseArchitecture of the InnoDBBackground process effect:1: Flush data to storage media in a timely manner2: InnoDB can return to normal when database exception is guaranteedVery similar to Oracle on the wholeBackground

1 parameter actionMySQL's various plug-in engines will handle and optimize transactions and threads. In the InnoDB engine, the number of threads that are always trying to keep the operating system in InnoDB (tentatively named Innodb_thread) should

Http://blog.jcole.us/2010/09/28/mysql-swap-insanity-and-the-numa-architecture/NUMA architecture CPU, a CPU has multiple cores, then each CPU becomes a nodeWhen this feature is turned offA node uses its own local memory and tries not to access other

This paper mainly introduces the logical storage and implementation of the INNODB storage engine table. Focus on how the data is organized and stored in the table.1. Index Organization table (Index organized table)In the InnoDB storage engine,

This is a continuation of the last part of the story to continue to say.4.InnoDB data page structurepage is the smallest disk unit of the INNODB Storage engine management database. A page of page type B-tree node holds the actual data for the rows

The storage engine in MySQL:1, the concept of storage engine2. View the storage engines supported by MySQL3. Features of several common storage engines in MySQL4. Mutual transformation between storage enginesFirst, the storage engine:1, storage

This article is about MySQL database InnoDB storage engine redo log roaming00–undo LogUndo log is for the atomicity of transactions, in the MySQL database InnoDB storage engine, also with the undo log to achieve multi-version concurrency control

1, Pre-order　　In order to reconstruct part of the Code of the service-side interface of the app (social class), so it touches the word innoDB, as well as the transaction, the following is mainly in the form of examples to show its usage, the theory

Mysql InnoDB Line Lock Implementation method innodb row locks are implemented by locking the index entries on the index, which is different from Oracle, which is achieved by locking the corresponding data rows in the data block. InnoDB This type of

MySQL InnoDB log mechanism in-depth analysishttp://blog.csdn.net/yunhua_lee/article/details/65678691.1.Log & CheckpointInnoDB transaction log refers to redo log, which is called log, stored in the log file ib_logfile* inside. InnoDB There is another

1. Index Use principle1), the leftmost prefix matching principle, MySQL will always match to the right until it encounters a range query (>, 3 and D = 4 If the order is established (A,B,C,D) Index, D is not indexed, if the establishment (A,B,D,C)

Ps:innodb This engine is very different from the MyISAM engine. In particular, its data storage format. For the data structure of INNODB, there are two conceptual issues to be solved first: shared tablespace and exclusive table space.1. What is a

MySQL InnoDB table is the index organization table this should be the knowledge that every MySQL learner will learn first, which means that the data in this table is stored in the primary key order, that is, the btree leaf node stores all the data

first, the data table structureCREATE TABLE ' Jx_attach ' ( ' attach_id ' int (one) not null auto_increment, ' feed_id ' int (one) DEFAULT NULL, ' att Ach_name ' varchar (255) NOT NULL, ' cycore_file_id ' varchar (255) DEFAULT null, '

MySQL InnoDB in the transaction log Ib_logfileThe transaction log or the redo log, in MySQL by default in the Ib_logfile0,ib_logfile1 name exists, you can manually modify the parameters, adjustOpen a few sets of logs to serve the current MySQL

Master's is the mark? MySQL, Slave replaced Percona, did not expect to keep up with progress, and Slave and Master gap more and more distant. Document and description of InnoDB efficiency adjustment and correction 　Found by file has a parameter

See an article on the Javaeye for MySQL FUD (fear, uncertainty and doubt) Use MySQL InnoDB Benchmark performance test to illustrate http://www.javaeye.com/topic/34676 The article said: "InnoDB disk performance is very worrying, MySQL lack of good

Public classTestjava {//define get resource file Private Static FinalResourceBundle bundle =Initbundle (); Private StaticResourceBundle Initbundle () {returnResourcebundle.getbundle ("Conf/chinapay", Locale.china); } //Key-value pairs