commit or rollback

What are the Redo log Undo logs in MySQL?In the database system, there are both data files and log files. Logs also contain cached Log buffer and disk file log files in the memory. This document describes the files that store logs. There are two

Reprint:http://www.cnblogs.com/kristain/articles/2038397.htmlFirst, what is a businessA transaction is a sequence of operations that accesses a database, and the database application system accesses the database through a transaction set. 　　The

Zend_Db_Adapter is the database abstraction layer API of zendframework. Based on pdo, you can use Zend_Db_Adapter to connect to and process multiple databases, including microsoft SQL Server, MySql, and SQLite. To instantiate a Zend_Db_Adapter

Cause Analysis and Solution of slow SQL query speed, and cause analysis of slow SQL query speed Cause Analysis and Solution for slow SQL query speed There are many reasons for slow query speed. The following are common causes:　　1. No index or no

The SQLite library can parse most standard SQL languages. But it also adds some new features. This document attempts to describe the SQL syntax that SQLite supports/does not support. View. In the following syntax table, plain text is displayed in

New Features of MySQL6.0 (Note: The content here will change as MySQL6.0 is still in its early stages) the following features have been or will be added to MySQL6.0: ◆ new Falcon transaction storage engine (see 13.8, "Falcon storage engine"); ◆

The Application of Oracle temporary tables in actual development is what we will introduce in this article. We know that I have always been amazed by SQL Server when writing a query-type stored procedure. Create procedure ps_procedure_name as select

PHPChina news: as MySQL 6.0 is still in its early stages, the content here will change. The following functions have been or are to be added to MySQL 6.0:* The New Falcon transaction storage engine (see "Falcon storage engine" in "13.8 ").* Supports

In SQLServer, WAL of logs is used to ensure the durability of relational databases. However, due to the characteristics of hard disks, it is impossible to write a log directly to the disk every time a log is generated, therefore, logs are cached and

MYSQL Getting Started: Link to basic transaction processing: MYSQL Getting Started: basic operations http://www.bkjia.com/database/201212/173868.htmlMYSQL Entry 2: Search Using Regular Expressions

Oracle experience 5 -- add, delete, modify, query, and @ oracle transaction processing @ Case Analysis1. add, delete, modify, and query DML (Data Manipulation Language-Data operation Language) in Oracle can be executed under the following conditions:

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 ");

TransactionScope is the. Net Framework 2.0 lag and adds a new namespace. Its purpose is to provide a "lightweight" [difference from: sqltransaction] thing for database access. You must add a reference to System.Transactions.dll before you use it.The

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

ORACLE _ Data Processing ORACLE _ Data Processing ① Data manipulation languageDML (Data Manipulation Language-Data Manipulation Language) can be executed under the following conditions:Insert data to a tableModify existing dataDelete existing

InOracleDatabase Operation encounteredORA-01591The cause of the error is that the distributed transaction is used. The cause of this problem is often caused by network problems. The solution is as follows: 1. Find TRAN_ID Select 'Rollback force 

1. What is implicit transaction? This is actually a concept that is not easy to understand. Let's take a look at what the document says. When a connection is operated in a recessive transaction mode, the SQLServer Database Engine instance

How Does Oracle apply row locks to a row of a database? How Does Oracle apply row locks to a row of a database? Select for update This is a row-Level Lock. When commit or rollback, the lock is released Remember to open the transaction, such as

Create sequence seq_newsIdincrement by 1 start with 1 maxvalue 999999999; select seq_newsid.nextval from sys. dual; Delete sqldrop sequence seq_newsId; www.2cto.com =============================== the sequence used in oracle development is a

We may encounter many headaches in Oracle commands and some functions, but sometimes we cannot solve this problem, we recommend that you use the Oracle9i analysis function to solve related problems in order to relieve your difficulty in sorting out