mysql innodb

It should be known that the InnoDB Single-column index cannot exceed 767bytes, and a federated index has a limit of not more than 3072 length. mysql> CREATE TABLE ' TB ' ( ' A ' varchar (255) DEFAULT NULL, ' B ' varchar (255) DEFAULT

With the structure and characteristics of the page, it is necessary to implement the salvage work of the database page;In order to facilitate the common use of Windows and Linux, plan to make a C language console application, and try to use only

found that when the SQL statement of the backup table runs at the same time as the SQL statement that deletes part of the data from the table, MySQL detects the deadlock and prints out the logCase descriptionDuring a timed script run, MySQL detects

Recently learning slick, found in MySQL created under the table, can not specify the database engine, the source of research, found that after modification can achieve the desired purpose.The code is as follows and is then used directly in the

By default, the parameters of the InnoDB are set very small and are not enough in the production environmentFor example, the two most important parametersInnodb_buffer_pool_size default is 8MInnodb_flush_logs_at_trx_commit The default setting is 1,

For an introduction to these four isolation levels: Unread (Read UNCOMMITTED). Another transaction modifies the data but has not yet committed, and select in this transaction reads the uncommitted data (dirty read). Submit Read

A few days ago, a team of the company's colleagues responded that the company's internal Linux server MySQL did not innodb this engine, I thought it should not be possible ah, MySQL default should have installed this engine, so on the server to look

Received SMS alarm, is a R710 hard disk (Raid5 8 block) Bad 1, contact room replacement hard disk, because of the slot problem   changed a few new hard drive after the bright yellow light, and the original 1 hard disk after the change, bright green,

Transaction characteristics ACIDAtomicity: atomicityA transaction must be considered an indivisible minimum unit of work, all operations in the entire transaction either commit successfully or all fail back, and for a transaction it is not possible

The storage engine is InnoDB. Nnodb is the first data storage engine on MySQL to provide foreign key constraints, in addition to providing transactional processing, InnoDB also supports row locks, provides consistent, non-lock reads like Oracle,

----------------------------------------------#查询JSON的某个字段select data, ' $ '. Host ' from temp# creates a virtual column alter TABLE temp ADD host varchar (GENERATED) always as (json_extract (data, ' $. Host ') VIRTUAL; #给虚拟列创建索引ALTER TABLE temp ADD

MySQL InnoDB Logical Storage structureFrom the logical structure of the INNODB storage engine, all data is logically stored in a space, called a tablespace, and the table space consists of segments (sengment), extents (extent), pages (page) . PS:

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 manages and backs up binary logs (I) Importance of binary logs if there is data backup at a certain point in time and all binary logs since then can replay the binary logs since the last full backup and" roll back "all changes (ii)

[MySQL] the InnoDB logical storage structure the tables in the InnoDB Storage engine are very similar to the index organization tables in Oracle. Each table must have a primary key. If the table is not displayed when it is created, the primary key

Mysql innodb (2) a previous article briefly introduced the role of innodbbufferpool_size. Next I will share with you the role of parameters related to innodb log files. The value www.2cto.com innodblogfile_size defines the size of the log file. The

Mysql Innodb learning experience for databases is mostly due to IO problems, so SSD devices can now become popular. Can I optimize the I/O of the database? I would like to give a general talk about my views here, hoping to achieve a better result.

Experience of mysql InnoDB row lock TABLE structure: SQL code CREATE TABLE '1970 _ t' ('id' int (11) NOT NULL AUTO_INCREMENT, 'A' int (11) NOT NULL, 'B' int (11) NOT NULL, PRIMARY KEY ('id'), KEY '2017 _ t_a' ('A ')) ENGINE = InnoDB www.2cto.com now

[MySQL] Innodb Parameter Optimization Innodb_buffer_pool_size The innodb_buffer_pool_size parameter is used to set the Innodb primary Buffer (Innodb_Buffer_Pool), that is, the primary cache space for caching user tables and index data, which has the

Mysql InnoDB row lock implementation method InnoDB row lock is implemented by locking the index items on the index. This is different from Oracle in MySQL, the latter is implemented by locking the corresponding data rows in the data block. The