what commit and rollback

Mysql stored procedure thing management ACID: Atomic, Consistent, Isolated, Durable storage provides an excellent mechanism to define, encapsulate, and manage transactions. 1. MySQL transaction support is not bound to the MySQL server itself, but

MySQL-(2) data stored by the storage engine in mysql is stored in files or memory using different technologies. These technologies use different storage mechanisms, indexing techniques, and locking levels to provide users with different choices.

To implement a mysql proxy, we need to understand and implement the mysql communication protocol first. In this way, the proxy can be used to build a bridge between the client and the server.Mixer mysql protocol implementation mainly refer to

Original: http://www.cnblogs.com/sharpxiajun/p/4251714.htmlStorage bottlenecks are now going into the deep-waters, if we have to do the site has been to do a vertical split of the database and horizontal split phase, then we face the challenges of

Original link: http://www.codeceo.com/article/web-artch-storage-3.htmlStorage bottlenecks are now going into the deep-waters, if we have to do the site has been to do a vertical split of the database and horizontal split phase, then we face the

1. Introduction to data enginesInMySQL5.1, MySQL AB introduced a new plug-in storage engine architecture, allowing the storage engine to be loaded into the new MySQL server being migrated.Use the MySQL plug-in storage engine architecture to

Copy codeThe Code is as follows:Mysql_query ("set autocommit = 0 ");$ List_one = $ db-> fetch_first ("select * from prizes where id =". $ id. "for update ");$ Db-> query ("DELETE from prizes WHERE id =". $ list_one ['id']);Mysql_query ("commit ");

Oracle knowledge point summary (1) architecture: the database architecture refers to the composition, working process and principles of the database, and the organization and management mechanism of data in the database. The architecture includes:

There are many reasons for slow query speed. The following are common causes:1. No index or no index is used (this is the most common problem of slow query and is a defect in programming)2. Low I/O throughput, resulting in a bottleneck effect.3. the

Although the query speed is slow for many reasons, if you optimize the query speed, you can also solve the query speed problem to a certain extent. There are many causes of slow query speed, which are common as follows: 1. no index or no index is

8.1.1 differences between a relational database and a file database system 1. relational databases are characterized by Data structuring, while file systems are unstructured. the logical structure of a relational database is a two-dimensional table,

Mysql Stored Procedure usage tutorial I hope this book will be able to talk to you like an expert, so that you can learn the required knowledge with simple questions and examples. In order to achieve this purpose, I will gradually establish concepts

Spring provides several classes for transaction processing:Transactiondefinition//Transaction Property DefinitionTranscationstatus//Represents the current transaction, which can be committed and rolled back.Platformtransactionmanager This is the

propagation_required, the default spring transaction propagation level, which is characterized by the addition of transactions to the transaction if a transaction already exists in the context, and the new transaction execution if no transaction

This article provides an excellent mechanism to define, encapsulate, and manage transactions. For more information, see This article provides an excellent mechanism to define, encapsulate, and manage transactions. For more information, see ACID:

The MySQL transaction should be defined by every MySQL database user. The following describes how to define MySQL transactions, which is helpful to you. By default, MySQL runs a COMMIT statement after each SQL statement is executed to effectively

MySQL GUI Tools is a set of graphical desktop application Tools that can be used to manage MySQL servers. The tool package includes three tools: MySQL Query Browser, MySQL Administrator, and MySQL Migration Assistant (only supported on Windows

Common oracle languages In Oracle development, the client sends SQL statements to the server, the server compiles and executes SQL statements, and returns the execution results to the client. An Oracle SQL statement consists of the following

1. Transactions in the InnoDB and BDB table environments have been introduced before pseudo transactions. This is the only table Type of ACID rule transactions that MySQL naturally supports. The old MySQL table types are still in use in many

Blog. btidea. comarticle. asp? There are many reasons for slow query speed of id440, which are common in the following ways: 1. No index or no index is used (this is the most common problem of slow query and is a defect in programming) 2. Low I/O