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$scott@orcl>create index loc_idx on t1(upper(loc)); Index crea...
To encounter this, Oracle introduced function-based indexes. A function-based index calculates the result of a function that involves one or more columns and stores that result in the index. The following shows the syntax of creating a function-based index: ...
Oracle PL/SQL之函数索引(Function-based indexes)使用示例,函数索引(Function-basedindexes)只有在where条件使用了与索引中相同的基于相同列的函数时才起作用。duzz$scott@orcl>setautotraceonduzz$scott@orcl>createtablet1asselect*fromdept;Tablecreated.Elapsed:0
Resolve Dependencies of Function-Based Indexes A function-based index depends on any function that it is using. If the function or the specification of a package containing the function is redefined (or if the index owner’s EXECUTE privilege is revoked), then the following conditions hold: 解决...
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 ...
Thought I might mention a common trap associated with Function-Based Indexes following a recent question on the OTN Database Forum. First of all, considered this "simple" little scenario. You have a column in a table that's a standard VARCHAR2 field and
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...
If any function-based indexes depend on the function, then Oracle Database marks the indexesDISABLED. See Also: ALTERFUNCTIONfor information on recompiling functions using SQL [ EDITIONABLE | NONEDITIONABLE ] Use these clauses to specify whether the function is an editioned or noneditioned object...
For more information, see Indexes on computed columns. Call extended stored procedures from functions The extended stored procedure, when calling it from inside a function, can't return result sets to the client. Any ODS APIs that return result sets to the client, return FAIL. The extended ...
This section provides examples of stored functions (seeChapter 27,Stored Objects) which you can create using some of the built-in functions provided by MySQL for use with GTID-based replication, listed here: SeeSection 14.18.2, “Functions Used with Global Transaction Identifiers (GTIDs)”, more...