optimizer_features_enable
来源:互联网 发布:物流软件 编辑:程序博客网 时间:2024/04/28 14:56
if you upgrade your database from release 10.1 to release 11.1, but you want to keep the release 10.2.0.4 optimizer behavior, you can do so by setting this parameter to 10.2.0.4
. At a later time, you can try the enhancements introduced in releases up to and including release 11.1 by setting the parameter to 11.1.0.6
.
ALTERSYSTEM SET optimizer_features_enable = '10.2.0.4';
Property Description
OPTIMIZER_FEATURES_ENABLE = { 8.0.0 | 8.0.3 | 8.0.4 | 8.0.5 | 8.0.6 | 8.0.7 | 8.1.0 | 8.1.3 | 8.1.4 | 8.1.5 | 8.1.6 | 8.1.7 | 9.0.0 | 9.0.1 | 9.2.0 | 10.1.0 | 10.1.0.3 | 10.1.0.4 | 10.1.0.5 | 10.1.0.6 | 10.2.0.1 | 10.2.0.2 | 10.2.0.3 | 10.2.0.4 | 10.2.0.5 | 11.1.0.6 | 11.1.0.7 }
Default value11.1.0.7
ModifiableALTER SESSION
, ALTER SYSTEM
Table 1-3 Optimizer Features for Oracle9I Releases
Index fast full scan
X
X
X
Consideration of bitmap access to paths for tables with only B-tree indexes
X
X
X
Complex view merging
X
X
X
Peeking into user-defined bind variables
X
X
X
Index joins
X
X
X
Table 1-4 Optimizer Features for Oracle Database 10g Releases
Index fast full scan
X
X
X
X
X
X
Consideration of bitmap access to paths for tables with only B-tree indexes
X
X
X
X
X
X
Complex view merging
X
X
X
X
X
X
Peeking into user-defined bind variables
X
X
X
X
X
X
Index joins
X
X
X
X
X
X
Dynamic sampling
X
X
X
X
X
X
Query rewrite enables
X
X
X
X
X
X
Skip unusable indexes
X
X
X
X
X
X
Automatically compute index statistics as part of creation
X
X
X
X
X
X
Cost-based query transformations
X
X
X
X
X
X
Allow rewrites with multiple MVs and/or base tables
X
X
Table 1-5 Optimizer Features for Oracle Database 11g Releases
Enhanced Bind Peeking
X
Use extended statistics to estimate selectivity
X
Use native implementation for full outer joins
X
Partition pruning using join filtering
X
Group by placement optimization
X
Null aware antijoins
X
- OPTIMIZER_FEATURES_ENABLE
- optimizer_features_enable
- 查询优化器参数optimizer_features_enable
- 11.2.0的参数OPTIMIZER_FEATURES_ENABLE会话层与语句层上设置区别;
- CGI编程小例子
- 一步一步学习hadoop(九)
- c primer plus 第七章 3
- 走技术线,还是技术管理线?
- ubuntu 安装 Tomcat7
- optimizer_features_enable
- 检测随机数是否为一个素数的C/C++实现
- 一个js实现的字体自动打印的效果
- 网络管理工具hyperic hq对MS SQL Server的监控配置
- 二十四.Sql server多表查询
- oracle中的exists 和not exists 用法详解
- 第二章 简单排序算法--插入排序,冒泡排序,选择排序
- 获取用户桌面路径
- 1080--Human Gene Functions