In addition, usingread-only materialized views eliminates the possibility of a materialized viewintroducing data conflicts at the master site or master materialized view site,although this convenience means that updates cannot be made at the remotematerialized view site. The following is an example of ...
A materialized view is a database object that contains the results of a query. They are local copies of data located remotely, or are used to create summary tables based on aggregations of a table's data. Materialized views, which store data based on remote tables are also, know as snapsh...
@@@materialized view is convenient for refresh and rewrite for sql. @@@create table is simlar to create materialized view. 2)maintainance 1@@@refresh @@@use EM => adminstration => materialized view <1> on demand (manual) <2> on commit <3> automatically (schedual) @@@evaluation: auto...
In addition, usingread-only materialized views eliminates the possibility of a materialized viewintroducing data conflicts at the master site or master materialized view site,although this convenience means that updates cannot be made at the remotematerialized view site. The following is an example of ...
Example of creating Real-time Materialized View: CREATE MATERIALIZED VIEW sum_sales_rtmv REFRESH FAST ON DEMAND ENABLE QUERY REWRITE ENABLE ON QUERY COMPUTATION AS SELECT prod_name, SUM(quantity_sold) AS sum_qty, COUNT(quantity_sold) AS cnt_qty, SUM(amount_sold) AS sum_amt, ...
Some materialized views contain only joins and no aggregates (for example, when a materialized view is created that joins the sales table to the times and customers tables). The advantage of creating this type of materialized view is that expensive joins are precalculated. ...
CREATE MATERIALIZED VIEW LOG ON PS_RA_CMPGN_WAVE WITH ROWID, SEQUENCE(BUSINESS_UNIT,RA_CAMPAIGN_ID,RA_CMPGN_WAVE_ID,RA_OFFER_ID) INCLUDING NEW VALUES; CREATE MATERIALIZED VIEW LOG ON PS_RA_PROMO_OFFER with ROWID, SEQUENCE(SETID,RA_PROMOTION_CODE, CAB_SOURCE_YEAR) INCLUDING NEW VALUES; ...
CREATE MATERIALIZED VIEW foreign_customers FOR UPDATE AS SELECT * FROM sh.customers@remote cu WHERE EXISTS (SELECT * FROM sh.countries@remote co WHERE co.country_id = cu.country_id); The following example creates a materialized view on two source tables: times and produ...
CREATE MATERIALIZED VIEW CREATE TRIGGER执行该过程也需要该特权COPY_TABLE_DEPENDENTS。 要让用户使用包重新定义其他模式中的表,必须授予用户以下权限: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 CREATEANYTABLEALTERANYTABLEDROPANYTABLELOCKANYTABLESELECTANYTABLE ...
For example: SQL>select count(*) from emp; ->>1 PARENT, 1 CHILD SQL>alter session set optimizer_mode=ALL_ROWS SQL>select count(*) from emp; ->> 1 PARENT, 2 CHILDREN Theoptimizer mode has changed and therefore the existing child cannot be reused,Thesame applies with events - if I ...