oracle create materialized view

description of several key choices: (1) Method of Creation (Buildmethods): Includes build immediate and builds deferred two. Build immediate generates data when you create a materialized view. Build deferred does not generate data at creation time, and then generates data as needed. The default is build IMMEDIATE. (2) query rewriting (queryrewrite): Includes

First, Oracle materialized view syntaxCreate materialized view [view_name]Refresh [Fast|complete|force][On [Commit|demand] | Start with (start_time) next (next_time)]As{Create a query statement for

immediate generates data when you create a materialized view, while build deferred does not generate data when you create the view, and then generates data as needed. The default value is build immediate. 2. query rewrite: Enable query rewrite and disable query rewrite. Spe

Materialized views in Oracle A materialized view is a database pair that includes a query result, which is a local copy of the remote data, or is used to generate a summary table based on the sum of the data tables. Materialized views store data that is based on remote tabl

involve default values. That is to say, we need to pay special attention to the handling of the default values of important definition parameters for materialized views in Oracle. Materialized View features: (1) materialized view

d Where E. dept_no = D. dept_no) Materialized view log created. Refresh clause [Refresh [Fast | complete | force] [On Demand | commit] [Start with date] [next date] [With {primary key | rowid}] Refresh option description: A. Oracle uses the refresh method to refresh data in the materialized

involve default values. That is to say, we need to pay special attention to the handling of the default values of important definition parameters for materialized views in Oracle. Features of materialized views: (1) materialized view is a physical table (and not just a phy

SELECT * FROM emp@remote_db eWHERE EXISTS (SELECT * FROM dept@remote_db d WHERE e.dept_no = d.dept_no) [refresh [fast|complete|force][on demand | commit][start with date] [next date][with {primary key|rowid}]]The refresh option specifies: The refresh method used by Oracle to refresh data in materialized view Whether the

materialized views. The restrictions on the rapid refresh of three materialized views vary greatly, but not in others. When you create a materialized view, you can specify a variety of options, following a brief description of several key choices:

limitations. Oracle converts any View query to a view SQL statement query. This improves the overall query performance without substantial benefits. Therefore, you need to create a materialized view on a common

,NUM2,NUM3,NUM4,NUM5,NUM6,NUM7 ) including NEW VALUES; --sm_user Creating a Log Create materialized view Log on sm_user with Sequence,rowid (Pk_user,user_name,user_code, PASSWORD,IDENTITY_NO); --sm_org Creating a Log Create materialized

The materialized view concept is similar to the summary table in discoverer. At the discoverer management end, you can create a different summary table. In the discoverer query, discoverer first parse the query to determine whether the query can use the corresponding summary table, if you can, will rewrite the query to query the corresponding summary table.An exa

An Introduction to materialized views: Http://blog.csdn.net/tianlesoftware/article/details/4713553 On Lao Yang's blog, I saw some column descriptions, sorted them out, and reproduced them. The original Article link is as follows: Rapid refresh of materialized views (1) Http://yangtingkun.itpub.net/post/468/14245 Rapid refresh of materialized views (2) Http://y

Number of materialized views synchronized 1. The purpose is to synchronize some data in the production database to the Data Warehouse. Considering the cost and convenience, the method of regularly refreshing the Materialized View Number of materialized views synchronized 1. The purpose is to synchronize some data in th

In 11.2, materialized view logs also add features that, for local materialized views, can now be refreshed using the commit SCN instead of the timestamp method in the previous version. Look at a simple example: Sql> SELECT * from V$version; BANNER --------------------------------------------------------------------------------

Materialized views are similar to indexes in many aspects: materialized views are used to improve query performance, while materialized views are transparent to applications, adding or deleting materialized views does not affect the correctness and validity of SQL statements in applications.

Usage and summary of Oracle Materialized View What is a materialized view? Materialized View is a database object that contains query results. It is a local copy of remote data or used

The biggest advantage of Materialized view is that it can improve performance: by pre-computing the answer to store it, it can greatly reduce the load on the machine.Features:Less physical reads-scanning less dataLess write-do not sort and aggregate frequentlyReduce CPU consumption-no need to aggregate data and call FunctionsSignificantly faster response time-query results will be returned quickly when data

Create materialized view [view_name] refresh [Fast|complete|force] [on [Commit|demand] | Start with (start_time) next (next_time) ] as {Create a query statement for materialized views} These are the common syntax for Oracle to

Materialized View synchronization count 1. Usage Now we need to synchronize some data in the production database to the Data Warehouse. Considering the cost and convenience, we need to regularly refresh the materialized view for data synchronization. 2. Overall Implementation ideas L