I have a question regarding computed columns, functions and indexed views. In an indexed view, I'm able to create indexes on (persistent & precise) computed columns, I'm able to create indexes on functions and scalar expressions, but I don't seem to be able to create an index on an ...
The view and subsequent indexes on the view are created. The base tables referenced in the view at the time the view is created. When any insert, update, or delete operation is performed on any table that participates in the indexed view. This requirement includes operations such as bulk cop...
How the Query Optimizer Considers Indexed Views - One interesting feature in SQL Server 2000 is that if you have a view with indexes, and the underlying table does not have indexes, the query optimizer might use the view even if the view is not specifically referenced by the query. The que...
Indexed views in SQL Server are, as near as makes no difference, what's called materialized view elsewhere. If your view has an underlying query that uses indexes defined on the base tables, the select on the view will use the index as well, that's not what an indexed views are about....
With SQL Server 2000, the functionality of SQL Server views was expanded to provide system performance benefits. It is possible to create a unique clustered index on a view, as well as nonclustered indexes, to improve data access performance on the most complex queries by precomputing and mater...
Indexes have been a method to improve the performance of SQL queries since the creation of relational databases in the 1970's. You are probably familiar with the ways that indexes can speed query operations at the expense of additional overhead during data inserts, updates, and deletes. Up un...
The examples given work only if you explicitly define the primary and foreign keys in the tables, or define unique indexes. Following are the appropriately constrained table definitions for emp and dept.CREATE TABLE dept ( deptno NUMBER(4) PRIMARY KEY, dname VARCHAR2(14), loc VARCHAR2(13));...
The catalog tables and views contain information about all tables, parameters, procedures, functions, distinct types, packages, XSR objects, views, indexes, aliases, sequences, variables, triggers, and constraints in the entire relational database. When an SQL schema is created, an additional subse...
In the following screenshot we are trying to create a non-clustered index on the view and we get the following error: An important point to note is that you must first create a unique clustered index on the view, before you can create any non-clustered indexes. The script below shows us...
However, the need to access base relations in response to queries... JA Blakeley,Per-Åke Larson,FW Tompa - 《Acm Sigmod Record》 被引量: 1132发表: 1970年 Automated Selection of Materialized Views and Indexes in SQL Databases Automatically selecting an appropriate set of materialized views ...