commit and rollback

1, the acid characteristics of the transaction: atomicity atomicity, consistency consistency, isolation isolation, durability persistence.2, the operation of the transaction① Transaction Commit sql>commit;   ② Transaction Rollback sql>rollback;     ③

Data Manipulation languageDML can be performed under the following conditions:– Inserting data into the table– Modify existing Data– Delete existing dataA transaction is made up of DML statements that do several thingsAdd a new data –insert

1. add, delete, modify, and query DML (DataManipulationLanguage-data operation language) in Oracle can be executed under the following conditions: insert data into the table, modify existing data, and delete existing data. A transaction is composed

1 DB2 Programming1.1 do not use the TAB key after creating a stored procedureCreate procedureYou can only use spaces, but not tab keys, otherwise the compilation will fail.Remember, remember.1.2 use temporary tablesNote that temporary tables can

The db2 tutorial is: DB2 programming skills (1 ).1 DB2 Programming1.1 do not use the TAB key after creating a stored procedureCreate procedureYou can only use spaces, but not tab keys, otherwise the compilation will fail.Remember, remember.1.2 use

1. Seven temporary filesThe content is organized from http://sqlite.org/tempfiles.html.A different feature of SQLite is that a database consists of a single disk file. This simplifies the use of SQLite, because you only need to copy a single file to

In C # programming, we usually perform database operations in the try statement block.Set the start and end of the transaction before and after database operations in try, and use the RollBack action in catch exception handling.This ensures that the

After the mysql client is successfully connected, you can use the show [session | Global] status command to provide server status information, or use the mysqladmin extended-STATUS Command on the operating system to obtain these messages.Show

-- General steps to optimize SQL -- 1. Learn the execution frequency of various SQL statements through show status and application features/* provide server status information through show status, you can also use the mysqladmin extended-STATUS

Create Table table name as select * from EMP; equivalent to dividing the EMP table into another data control language: DML (data manipulation language-data operation language) you can execute the following conditions: • insert data into a table •

Back to directory . Net transactions can be divided into explicit and stable transactions. explicit means that we need to manually specify the transaction commit and rollback, while stable is. net helps us manage your transactions.CodeWhen there

1. Introduction to data engines InMySQL5.1, 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

0. Catalogue 1. Preface 2. Preparatory work 3. Simple test statement 4. Commit and Rollback 5. How to Package a class 1. Preface After learning the basic SQL Server syntax, and then learn how to use SQL in the program, after all, can not be used in

MySQL optimization: How to understand the SQL execution frequency show [session | global] status. you can add the parameter "session" or "global" as needed to display the session level (current connection) and global (since the last time the

We know that Oracle performs Database Change operations in transaction units. So when will Oracle submit? For DML statements, Oracle does not automatically commit transactions until there is a commit or rollback command to process the changes in the

About the optimization of SQLite, the first is to be able to use the SQL Statement batch processing, do not single-stroke operation, the cursor is more can not use. For example, a batch of delete/update, assembly of conditions into SQL statements,

Overview Transactions must be atomic, consistent, isolated, and persistent. Although acronyms are easy to remember, the meaning of each word is not obvious. The following is a brief description.● Atomicity: Atomicity ensures that either all updates

The following example creates an OleDbConnection and an OleDbTransaction. It also demonstrates how to use the BeginTransaction, Commit, and Rollback methods. Public void RunOleDbTransaction (string myConnString){OleDbConnection myConnection = new

This article mainly introduces the mysql transaction processing usage of pdo in php, and analyzes the usage of pdo-based transaction commit and rollback operations in the form of instances, which has some reference value, for more information,

Introduction to Autonomous TRANSACTION (Autonomous affairs)In the process of doing some projects based on the lower version of Oracle, sometimes there are some headaches, such as the need to record some information to the trace table for each step