Mysql create view with engine myisam software#
Mysql create view with engine myisam free#

But InnoDB row lock, only in WHERE the primary key is effective, non-primary key WHERE are locked the whole table. Row locking substantially improves the new ability of multi-user concurrent operations. InnoDB: Support for transactions and row-level locks is the most important feature of innodb.MyISAM: Only supports table-level locking, when users operate myisam table, select, update, delete, insert statements will automatically lock the table, if the table after locking meets insert concurrency, new data can be inserted at the end of the table.The auto-grow column of the engine must be an index, and if it is a combined index it must also be the first column of the combined index. InnoDB: InnoDB must contain indexes for only that field.

The auto-growth column of the engine must be an index, if it is a combined index, the auto-growth can be not the first column, he can sort and increment according to the previous columns.

MyISAM: Can be used with other fields to create a joint index.

With transaction (commit), rollback (rollback) and crash recovery capabilities (crash recovery capabilities) of transaction-safe (ACID compliant) type table.

InnoDB: Provides transaction support for transactions, external keys and other advanced database features.

MyISAM: Emphasis is on performance, each query has atomicity, its execution number is faster than InnoDB type, but does not provide transaction support.

Mysql create view with engine myisam free#

InnoDB: The free solution can be to copy data files, backup binlog, or use mysqldump, which is relatively painful when the amount of data reaches tens of G.It can be operated separately for a table during backup and recovery.

MyISAM: The data is stored in the form of files, so it will be convenient in the cross-platform data transfer.InnoDB: requires more memory and storage, it will create its own dedicated buffer pool in main memory for caching data and indexes.Support three different storage formats: static table (default, but note that there can’t be spaces at the end of the data, it will be removed), dynamic table, compressed table. MyISAM: It can be compressed and the storage space is small.InnoDB: By default all the tables are stored in the same data file (or may be multiple files, or separate tablespace files), the size of InnoDB table is only limited by the size of the operating system file, usually 2GB.MyISAM: Each MyISAM is stored on disk as three files (structure, table index, table data space).frm file stores table definitions.What is the difference between MyISAM and InnoDB?

Mysql create view with engine myisam software#

Currently InnoDB is licensed under a two-track system, one under the GPL and the other under a proprietary software license. InnoDB, one of the database engines of MySQL, is one of the standards released by MySQL AB for binary, InnoDB was developed by Innobase Oy and acquired by Oracle in May 2006. However, in these years of development, MySQL also imported InnoDB (another database engine) to strengthen the reference integrity and concurrent violation handling mechanism, and then gradually replaced MyISAM.

Although the performance is excellent, it has one drawback: it does not support transaction. MyISAM is the default database engine of MySQL (before version 5.5), improved by the earlier ISAM (Indexed Sequential Access Method). In order to solve this puzzle, I searched the web and found the following information. In the process of using MySQL, I have some questions about the concepts of MyISAM and InnoDB, and what is the difference between the two engines has always been a question in my mind.