Analyzing crash recovery If a failure occurs while the instance is running and DB2(R) cannot complete or commit all of the outstanding units of work, the database is left in an inconsistent and u
我们从一个用户请求开始讲,ORACLE的简要的工作机制是怎样的,首先一个用户进程发出一个连接请求,如果使用的是主机命名或者是本地服务命中的主机名使用的是机器名(非IP地址)，那么这个请求都会通过DNS服务器或HOST文件的服务名解析然后传送到ORACLE监听进程,监听进程接收到用户请求后会采取两种方式来处理这个用户请求,下面我们分专用服务器和共享服务器分别采用这两种方式时的情况来讲： 专用服务器
分区表维护的常用命令： ALTER TABLE-- DROP -- PARTITION-- ADD |-- RENAME |-- MODIFITY |-- TRUNCATE |-- SPILT |-- MOVE |-- EXCHANGE | 分区索引的常用维护命令： ALTER INDEX-- DROP -- PARTITION-- REBUILD |-- RENAME |-- MODI
a.获取单个的建表和建索引的语法,其他对象类似： select dbms_metadata.get_ddl('TABLE','TABLE_NAME','TABLE_OWNER') from dual; select dbms_metadata.get_ddl('INDEX','INDEX_NAME','INDEX_
1）根据SID，从v$sql中找到相应SQL的HASH_VALUE和ADDRESS ； SELECT a.sql_text , a.address , a.hash_value FROM v$sql a , v$session b where a.hash_value = b.
Platforms: 1-914CU; This document is being delivered to you via Oracle Support's Rapid Visibility (RaV) process and therefore has not been subject to an independent technical review. Appl
Purpose: This bulletin provides the Database Administrator a better understanding of incremental checkpoint and a description of four initialization parameters used for checkpoint tuning: &
PURPOSE~~~~~~~The document gives a overview of Parsing. SCOPE & APPLICATION~~~~~~~~~~~~~~~~~~~For users requiring a general overview of how parsing works.Introduction============This article show
数据库优化流程
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