commit and rollback

1. upgrade hardware 2. Create an index based on the query conditions, optimize the index, optimize the access mode, and limit the data volume of the result set.3. Expand the server memory4. Increase the number of server CPUs5. Do not set Automatic

Run the following code in the query Analyzer:  Code Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/-->Declare @ SQL varchar (100) While 1 = 1 Begin Select top 1 @ SQL = 'Kill '+ cast (spid as varchar (

Before talking about the Xa specification, you must first understand the concept of Distributed Transaction Processing (DTP. Transaction, or transaction, refers to a set of processes for executing certain functions in one or more resources, such as

1. mysqldump First, let's take a look.MysqldumpThe actual working method of several main parameters.Main mysqldump options 1.-Q It's very simple. I just added SQL _no_cacheTo ensure that the data in the cache is not read. 081022 17:39:33 7

Slow SQL query speedThere are many reasons for slow query speed in SQL Server databases. 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

A database is a shared resource that can be used by multiple users. These user programs can be executed one by one in a serial manner. At each time, only one user program runs and accesses the database. Other user programs can access the database

How can I speed up queries?1. upgrade hardware2. Create an index based on the query conditions, optimize the index, optimize the access mode, and limit the data volume of the result set.3. Expand the server memory4. Increase the number of server

In Oracle8i or a later version, you can create two types of temporary tables: 1. Session-specific temporary table Create global temporary () On commit preserve rows; 2. Temporary tables specific to transactions Create global temporary () On

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.

SQL Server database optimization solution 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

Pl/SQL is an extension of oracle's standard database language. oracle has integrated pl/SQL into oracle servers and other tools, in recent years, more developers and DBAs have started to use pl/SQL. This article describes basic pl/SQL syntax,

Concurrency of DB2 Universal DatabaseIn the database management system (DBMS) field, the term "concurrency" is used to indicate the ability of more than one application to access the same data at the same time (from the user's perspective. One of

Indexes and constraints can constrain the data that can be placed in a table.The index on the table provides a way to quickly search for individual records. When creating a table index, you can select which or which fields to index.The index can be

1. append dataInsert into table [(column [, column...])]Values (value [, value...]);Example 1: insert into dept (deptno, dname, Loc)Values (50, 'Development ', 'detroit '); Example 2: insert into DeptValues (50, 'Development ', 'detroit ');Example 3:

[Posting]Source: http://blog.csdn.net/metababy/archive/2005/12/28/563680.aspxIntroduction Excel is a software in Microsoft Office Automation suite. It is mainly used to process workbooks. Excel has been welcomed by many users for

SQL statement optimization principles:◆ 1. Use indexes to traverse tables fasterThe index created by default is a non-clustered index, but sometimes it is not optimal. In a non-clustered index, data is physically stored on the data page randomly.

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

Start transaction, commit, and rollback syntax Start transaction | begin [work] Commit [work] [and [no] Chain] [[No] Release] Rollback [work] [and [no] Chain] [[No] Release] Set autocommit = {0 | 1} The START transaction or begin statement can start

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.　

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