The Oracle optimizer uses two different methods to recognize when to rewrite a query in terms of one or more materialized views. The first method is based on matching the SQL text of the query with the SQL text of the materialized view definition. If the first method fails, the optimizer ...
Oracle Cloud Infrastructure - Database Service - Version N/A and laterInformation in this document applies to any platform.SymptomsIn a database that has an AFTER ALTER ON DATABASE trigger enabled, if this trigger becomes invalid and cannot be recompiled, and the database has materialized views...
virtual void checkEntry (Map::Entry::View vEntry) Check the passed value to verify that it does belong in this ContinuousQueryCache. virtual void checkEntry (Object::View vKey, Object::Holder ohValue) Check the passed value to verify that it does belong in this ContinuousQue...
通俗地讲,Resolver可以分为两部分:Semantic check和Rewriter。 Semantic check 这个概念来自于Oracle,主要负责将field、db甚至host等资源信息去和真实数据库内的对象去做绑定。举个例子,Parser是不关心field是否真实存在的,只要符合格式,随便写个字符串它都会语法解析成Item_field对象;而Semantic check步骤正是去结合数据库...
A GUI Oracle create table tool that generates Oracle specific create table SQL that includes such elements as column names, column types, column lengths or precisions, column scales, nullability, unique constraints, default values, and the ability to add check constraints. Oracle Database Backup ...
For any SQL statement processed by Oracle Database, the optimizer performs the operations listed in Table 11-1. Table 11-1 Optimizer Operations Sometimes, you may have more information about a particular application's data than is available to the optimizer. In such cases you can...
View Merging Predicate Pushing Subquery Unnesting Query Rewrite with Materialized Views Any combination of these transformations can apply to a given query. 11.1.2.1.1View Merging Each view referenced in a query is expanded by the parser into a separate query block. The block essentially represents...
The method chain will result in a materialized result once the developer makes use of a terminal operator, e.g., on the de-sugared LINQ query in the example, evenSquares.ToArray() is called to materialize the query result into an array. From now on, we will refer to this syntax as ...
HICKMAN BECKER BINGHAM LEDESMA/ORACLE (Campbell, CALIFORNIA, US) Claims: What is claimed is: 1.A method comprising:storing a query;before executing the query, analyzing content of the query to determine whether the query contains two or more sub-queries that, if executed, could cause generation...
within the in-memory unit, mapping data that maps a set of metadata values associated with the first computation to the first set of computation results; using, by the database server instance, the first set of computation results, which were materialized within the in-memory unit, to answer...