what commit and rollback

Http://www.buywork.cn/biancheng/database/ SQL /20071111/10840.html 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

50 methods to skillfully optimize your SQL Server database   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)

In traditional J2EE applications, transaction management is bound with EJB. At that time, most people only use the local slsb of EJB to use its declarative transaction management. With the continuous development of technology, such as the emergence

Java database connection (JDBC) is composed of a group of classes and interfaces written in Java programming language. JDBC provides a standard API for tools/database developers to write database applications using pure Java APIs. However, the

Java database connection (JDBC) is composed of a group of Java Programming Language The composition of the written classes and interfaces. JDBC provides a standard API for tools/database developers to write database applications using pure Java

When initializing the sqltransaction class, you need to use the begintranscation () method of the sqlconnection class:Sqltransaction mytran; mytran = myconn. begintransaction (); This method returns a variable of the sqltransaction type. After the

1. No index or no index is used (this is the most common problem of slow queryProgramDesign defects)2. Low I/O throughput, resulting in a bottleneck effect.3. the query is not optimized because no computing column is created.4. Insufficient memory5.

At the beginning of. net2.0, there was direct support for transactions. We no longer needed COM + transactions for transaction management, and transactionscope became a class that I often use. Generally speaking, I know the commit and rollback of

Original Website: Http://database.ctocio.com.cn/222/9068222.shtml 1. No index or no index is used (this is the most common problem of slow query Program Design defects) 2. Low I/O throughput, resulting in a bottleneck effect. 3. the query

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

1. Transaction concept: Concept: transactions in databases are logical units of work. A transaction is composed of one or more SQL statements that complete a group of related behaviors, the transaction mechanism is used to ensure that the operations

Mysql uses the InnoDB Storage engine by default from 5.5. to use the InnoDB Storage engine, you must add the compilation parameters when compiling and installing mysql. The compilation parameters of different versions are also slightly different,

Starting from 9i, Oracle also provides a new Undo Data Management method, that is, using the Automatic Oracle Undo tablespace Management, usually abbreviated as AUM ). (1) check whether the empno = 7788 record exists in the Buffer Cache. If it does

Java transaction (8), java transaction I. Preface: In the previous blog, we used jotm to implement distributed transactions. This article uses atomikos. The basic code is the same, that is, the configuration is slightly different. Ii. Code

Comparison of three common Mysql database engines: mysql Database Engine (Click the blue icon on the top to quickly follow it) ISAM: ISAM is a well-defined and time-tested data table management method. It is designed to take into account that the

DB2 specifications-log , db2 log 8:40:23 on Tuesday morning 1. the overall specification keywords are capitalized, {} overall fast [] Option 1.2 note operator priority 1.3 Note link character 1.4 Delete duplicate row keyword distinct show 1.5 use

  Transactions are one of the important features of a database that distinguishes a file system. In a file system, if you are writing a file but the operating system suddenly crashes, the file may be damaged, of course, there will also be some

Database review 8 -- concurrency, database review 8Database review CH15 concurrency 15.1 concurrency issues The I (Isolation, independent) of the ACID nature of the transaction, and the concurrent transactions are transparent. The interspersed

Summary To implement a mysql proxy, you must first understand and implement the mysql communication protocol. 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

Various engines in MySQLThe storage engine in the database is actually used to set the tables that use the engine. What storage engine is set for the tables in the database, this table has different effects in terms of data storage, data update,