oracle11g 自动并行
Oracle 11g introduced automatic DOP 。ODM KNOWLEDGE:When automatic degree of parallelism (Auto DOP) is on the Oracle Optimizer will Automatically decide the DOP for a statement based on the resource requirements of the statement. Any statement that can be parallelized is a candidate for AUTO ...
Voting Disk and OCR in 11gR2: Some changes
Voting Disk and OCR in 11gR2
Oracle11gR2后direct path read等待事件的改变
监控Oracle数据库时发现,full table时的等待事件为direct path read.数据库的版本为:Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit Production 查了下资料,11gR2后对direct p...
APPEND_VALUES Hint in Oracle Database 11g Release 2
转:http://www.oracle-base.com/articles/11g/append-values-hint-11gr2.phpAPPEND_VALUES Hint in Oracle Database 11g Release 2We have been able take advantage of the performance benefits of direc...
Append Hint
转:http://www.oracle-base.com/articles/misc/append-hint.php#how-the-append-affects-redo-generationAPPEND HintHow the APPEND Hint Affects PerformanceHow the APPEND Hint Affects the Table Size ...
PowerDesigner 中将Comment(注释)及Name(名称)内容互相COPY的VBS代码(转)
在用PowerDesigner时.常常在NAME或Comment中写中文在Code中写英文.Name只会显示给我们看,Code会使用在代码中.但Comment中的文字会保存到数据库TABLE的Description中,有时候我们写好了Name再写一次Comment很...
启用表级的Result Cache
启用表级的Result CacheResult Cache是Oracle11g引入的新特性。在Oracle11g Release 1,我们可以通过如下方式启用result cache1) 数据库级启用 alter system set result_cache_mode = force;&nbs...
Using Oracle Database 11g Release 2 Result Cache in an Oracle RAC Environment
Using Oracle Database 11g Release 2 Result Cache in an Oracle RAC Environment (转:http://www.oracle.com/technetwork/articles/datawarehouse/vallath-resultcache-rac-284280.html)By Murali Vallat...
query result cache in oracle 11g
query result cache in oracle 11gCaching has been a feature of Oracle for as long as most of us can remember. Over the many years and versions, Oracle has continually expanded its caching mecha...
Automatic SQL Tuning in Oracle Database 11g
Automatic SQL Tuning in Oracle Database 11g Release 1As part of Automatic SQL Tuning, Oracle 11g automatically runs the SQL Tuning Advisor against high impact SQL statements duri...
ORACLE11G自动维护任务简析
ORACLE 11G 自动维护任务: 自动维护任务是一种按规则自动启动的数据库维护操作任务。比如自动收集为查询优化器使用的统计信息。自动维护任务按维护窗口自动运行。所谓自动维护窗口是按照预定义的...
AIX进程内存占用数的计算
昨天分析了Linux进程内存占用数的计算。 今天,我们来分析下AIX下进程内存占用。 AIX man ps 提示"RSS (v flag) The real-memory (resident se...
Linux进程内存占用数的计算
前几天同事反馈:数据库主机上的server process占用的物理内存过大,比v$process视图中的大很多。他是使用ps查看rss来计算物理内存的。 man ps中对rss的解释: RSS &nb...
Oracle Text SQL Statements and Operators
摘自: http://docs.oracle.com/cd/B19306_01/text.102/b14218/csql.htm#i997503 CONTAINSUse the CONTAINS operator in the WHERE clause of a SELECT statement to specify the query expressio...
能select的表,可以exp吗?有exp_full_database就能exp其他用户的表吗?
能select的表,可以exp吗?有exp_full_database就能exp其他用户的表吗? 下面来测试下: 1.建立导出测试用户,并授予相关权限[oracle@GXDB1] $sqlplus /nologSQL*Plus: Release 10.2.0.4.0 - Prod...
透明数据加密
转:http://www.linuxidc.com/Linux/2011-12/48689.htm不写一行代码,透明的加密敏感数据! 这可能是你的公司最恐怖的噩梦:有人偷走了数据库的备份磁带!当然,你可能构造了一个安全的系...
编写自己的ClassLoader时设置Thread的contextClassLoader
How to write a custom classloader in java中说到启动JVM时可以通过设置java.system.class.loader来指定自己编写的classloader. 当设定java.system.class.loader时:通过Thread.currentThread().getCo...
How to write a custom classloader in java
转载一个不错的classloader入门介绍: ClassLoader (1) – What is a ClassLoader?ClassLoader (2) – Write your own ClassLoaderClassLoader (3) – Namespaces...
Key-preserved table concept in join view (Ask Tom)
You AskedCould you explain me about Key-preserved table conceptin join views.i know that a table is ket preserved if every key of the table can also be a key of result of the join.but i n...
Spring AOP 介绍
转:http://pandonix.iteye.com/blog/336873此前对于AOP的使用仅限于声明式事务,除此之外在实际开发中也没有遇到过与之相关的问题。最近项目中遇到了以下几点需求,仔细思考之后,觉得采用AOP 来解决。一方...