Function-Based Indexes An expression like WHERE LOWER(email) won't use an index created for the email column. By creating a function-based index (functional index) you can use this condition with full index support. Every developer has at least once been puzzled why a simple condition like ...
函数索引(Function-based indexes)只有在where条件使用了与索引中相同的基于相同列的函数时才起作用。duzz$scott@orcl>set autotrace on duzz$scott@orcl>create table t1 as select * from dept; Table created. Elapsed: 00:00:00.01 duzz$scott@orcl>create index loc_idx on t1(upper(loc)); Index crea...
To encounter this, Oracle introduced function-based indexes. A function-based index calculates the result of a function that involves one or more columns and stores that result in the index. The following shows the syntax of creating a function-based index: ...
As of Siebel CRM 22.8 Update, developers can work with their database administrators to create function-based indexes in Siebel Tools where they are deemed appropriate for performance reasons in your deployment. Examples where function-based indexes can
A database system provided according to an aspect of the present disclosure provides indexed data for non-deterministic functions. In an embodiment, a request to maintain an indexed data for a non-deterministic function is received. The non-deterministic function specifies a set of input variables ...
A nonunique index can be used to enforce a primary key or unique constraint. In Oracle8i indexes can be rebuilt without locking the table. The DROP COLUMN option of the ALTER TABLE command is restartable. The MOVE option of the ALTER TABLE command retains the constraints of the table. Data...
With Oracle's SDO_GEOMETRTY, we can create function-based spatial indexes that vastly improve performance for computed geometry columns. Could Esri add that functionality for SDE.ST_GEOMETRY in Oracle? function-based spatial index oracle performance st_geometry 0 Kudos View All Ideas Previou...
Date: August 29, 2016 03:57AM Hi, I have a table with a datetime column say col1. I have to add on offset to this and then use it in the where clause. Ex : where col1 <= col1 +offset I understand that there are no function based indexes but there are alternatives like generat...
In this paper, we propose to replace the calculation of the original concordance and discordance indexes of ET method by a more effective sigmoidal model. Such model is part of a new Belief Function ET (BF-ET) method under development and allows a comprehensive, elegant and continuous ...
(Jeppsson & Pons,2004; Liu et al.,2020). However, in this study, a new approach was developed to bridge the gap of time series data scarcity and the lack of preference on the ranking of the impact on effluent parameters. In the model, to calculate the indexes a normalized equal weight...