commit or rollback

In this Document Goal Solution Overview Steps in writing Java Concurrent program Template

Change and deletion in 1.Oracle DML (Data manipulation language– ) can be performed under the following conditions: Inserting data into a table, modifying existing data, and deleting existing data. A transaction consists of a DML statement that

MySQL supports table-level locking of tables for the MyISAM and memory storage engines, row-level locking of tables in the BDB storage engine, and row-level locking of tables InnoDB the storage engine. By default, table and row locks are

Design | data | database | database connection Pick to beThis paper introduces the working principle of database connection pool based on JDBC, expounds the key technologies such as transaction processing of connection pooling technology, multi

This section will show you how to access a database using Ruby. The Ruby DBI module provides a database-independent interface for Ruby scripts similar to the Perl DBI module. DBI, the Database independent interface, represents a Ruby-independent

A transaction is a series of actions that must take effect at the same time or cancel execution at the same time. All operations in a transaction take effect as a commit of a transaction, and all operations in the transaction cancel the rollback

This article describes the impact of database transaction isolation levels on locks, and understands the relationship between lock and dirty reads by comparing transaction isolation levels 0 and 1. Experiment content: Set 0 and Level 1 isolation

Starting with SQL2005, checksum checksum is added as an option for page checksums, the most widely known two checksum options are the checksum options and page validation checksum options at backup time Another option that less people know

In order to access an ODBC data source, the application should include the following steps:1. Connecting to an ODBC data sourceRequires a given ODBC data source name and some other necessary information.Before an application calls an ODBC function,

I. Why to introduce a lockConcurrent operations on a database by multiple users can lead to inconsistencies in the following data:Missing updatesA, a, two users read the same data and modify it, and one of the user's modifications destroys the

Overview of LocksI. Why to introduce a lockConcurrent operations on a database by multiple users can lead to inconsistencies in the following data:Missing updatesA, a, two users read the same data and modify it, and one of the user's modifications

----------------------------------------------------------------Database artboards:When a table defines a primary key or a unique index, you can modify, add, and delete data in the results window.Using SQL statements to create a data table is the

The locking mechanism of OracleThe main purpose of the blockade mechanism is to control the concurrency, to block the interference and to ensure the consistency and accuracy of the data. There are three ways to block Oracle databases: Shared

Transactionsas the basic unit of logical processing, for database operations, one or more SQL statement to form. Of course, there is a good application for non-database operations, such as a restore point set on a computer. The basic nature of the

Transactionsas the basic unit of logical processing, for database operations, one or more SQL statement to form. Of course, there is a very good application for non-database operations, such as a restore point set on a computer. The basic nature of

----------------------------------------------------------------Database artboards:A table that defines a primary key or a unique index enables you to change, add, and delete data in the results window.Using SQL statements to create a data table is

Go-sql-driverThere are several ways to request a connected function, which is slightly different in the way that the connection is done, roughly as follows: Db. After the Ping () call is complete, the connection is returned to the connection

The source of this article: http://www.cnblogs.com/wy123/p/6110349.htmlYou've encountered a situation like this before:Some of the sessions connected to the database will be blocked at irregular intervals, which can be short, sometimes longer, and

The basic knowledge of the transaction is described in point one, so how do you deal with the transaction in MySQL?A transaction is made up of a set of SQL statements that are entered by a user and are terminated as modified to persist or roll to

that need to be performed SQL statements:The addition, modification, and deletion of data in the database are all part of the Database manipulation language ( DML), such types of SQL statements can only be made to work by executing commits in the