mysql innodb

The implementation of MySQL transaction involves redo and undo as well as Purge,redo to ensure the atomicity and persistence of transactions; Undo is the consistency of the transaction (consistent read and multiple versioning concurrency control);

Master thread has the highest priority in the county. It consists of several loops (loop), a main loop (loop), a background loop (background loop), a refresh loop (flush loop), and a pause loop (suspend loop). The master thread switches between Loop,

MYSQL Inndodb's redo log and binlog appear to be very similar on the surface. However, there is a big difference in nature:First: REDO log is generated at the InnoDB storage Engine layer, and Binlog is generated on top of the MySQL database, and the

Semi-consistent IntroductionFor those familiar with MySQL, or have seen InnoDB source of friends, may have heard of a fresh noun: semi-consistent read. What is semi-consistent read? The following paragraph, excerpt from the semi-consistent read

First1. Buffer poolThe InnoDB storage engine is disk-based and manages the records in it as a page. Buffer pools are typically used to improve the overall performance of the database. The buffer pool is simply a piece of memory, which compensates

InnoDB Architecture The InnoDB storage engine primarily includes memory pools and background threads. Memory pool: Multiple memory blocks make up a pool of memory, mainly maintain the internal data of the process/thread, cache the disk

First, the main difference1. Transaction ProcessingInnoDB supports transactional features, MyISAM not supported. Myisam executes faster and performs better.  2, select, UPDATE, INSERT, delete operation MyISAM:if executing a lot of select,myisam is a

MySQL is the most popular open source database, InnoDB in 5.6 has become the default engine, in 5.7 system bar engine also has myisam to InnoDB, you can see that InnoDB engine now can meet most of the business needs, memory allocation directly

Key configuration: Turn off Binlog Environment: 8G SQL file, more than 300 InnoDB data sheets,( with mysqlworkbench exported data, with Heidisql import, because the formal environment is MySQL, can be used mysqlworkbench, and MARIADB can not use

Official Document Description :Http://dev.mysql.com/doc/refman/5.5/en/commit.html1.autocommit only available for InnoDb Data Sheet ;2. the default is automatic submission , can be queried by the statement : SELECT @ @autocommit;3.SET autocommit

Introduced:InnoDB provides MySQL with a transaction-safe (acid-compatible) storage engine with Commit, rollback, and crash resiliency. InnoDB locks the row-level and also provides an Oracle-style, non-locking read in the SELECT statement. These

150414 16:23:07 [ERROR] Plugin ‘InnoDB‘init function returned error.150414 16:23:07 [ERROR] Plugin ‘InnoDB‘ registration as a STORAGE ENGINE failed.150414 16:23:07 [ERROR] Unknown/unsupportedtable type: InnoDB150414 16:23:07 [ERROR] Aborting

ps-a | grep-i mysqlkill list of processesservice MySQL startmy problem is solved.----------------------------------------------Fedora8 Start MySQL Error:ERROR 2002 (HY000): Can ' t connect to local MySQL server through socket

MySQL's InnoDB expansionin order to add a data file to the tablespace, first close the MySQL database, edit the my.cnf file, confirm the InnoDB ibdata file and MY.CNF configuration is consistent, there are two situations:Configuration of 1.MY.CNF

The InnoDB database is marked as deleted and does not really release the disk space it occupies, which results in a growing InnoDB database file. If you set up innodb_file_per_table=1 when you create the database, InnoDB creates a data file for

Conditions:2 servers: A and B, the tables on a server are required to migrate to the B server.InnoDB table: Sysuser, record number: 351781.The following tests are performed in the MySQL 5.5.34.Start processing:1: Establish the Sysuser table on the B

First of all, why do this because I work on a large Drupal project, the database files are large, and each new feature is developed on the branch, which means I need to build multiple local environments and often need to delete old branches and

InnoDB is the most widely used transaction storage engine in MySQL, and many parts of the design and Oracle are common. For Oracle DBAs, learning can be more of an analogy to some of Oracle's features, and of course, to understand the difference.

InnoDB Storage Engine1. Storage: Data directory. Can be modified by configurationStore file: Frm,ibd end of file. FRM storage table structure, IBD stores indexes and dataStorage log: Ib_logfilen file2.INNODB storage engine turned on or off:Close

The InnoDB storage engine supports transactions designed primarily for online transaction (OLTP) applications, characterized by:Row lock design, supports foreign keys, and supports non-locking reads similar to Oracle, that is, default read