# ORA-12004 refresh fast cannot be used for materialized view: 数据库快照刷新的困扰与解决方案 ## 简介 在Oracle数据库中,快照是一种用于记录数据库状态的数据备份方式。通过快照,我们可以在特定时间点上生成数据库的快照,以便后续进行数据恢复或查询。然而,在使用快照的过程中,有时会出现ORA-12004 refresh ...
For the first case Oracle will raise an error if you try to create such a materialized view with its refresh method defaulted to REFRESH FAST. In the example below table T does not have a materialized view log on it. Materialized views based on T cannot therefore be fast refreshed. If we...
The Oracle provided DBMS_MVIEW.explain_mview procedure was used to analyze each of the existing materialized views FAST REFRESH capabilities and write the results to the MV_CAPABILITIES_TABLE. Now using DBMS_MVIEW.explain_mview procedure I will analysis the possible reason why the materialized vie...
Oracle Database Exadata Express Cloud Service - Version N/A and laterInformation in this document applies to any platform.Note: This solution is not possible in 9i; trying it for 9i and below will result in ORA-12015: cannot create a fast refresh materialized view from a complex query....
[oracle@solaris ~]oerr ora 12015 12015, 00000, “cannot create a fast refresh materialized view from a complex query” // *Cause: Neither ROWIDs and nor primary key constraints are supported for // complex queries. // *Action: Reissue the command with the REFRESH FORCE or REFRESH COMPLETE ...
During the fast refresh of a join mview where the master tables are on a remote database, the recursive delete command on the mview container table performs a full table scan on each master table (or via index if there is any) even when just few rows are impacted. ...
SQL> create materialized view log on fact with rowid; 实体化视图日志已创建。 SQL> create materialized view mv_fact refresh fast on commit as 2 select f.rowid f_rowid, a.rowid a_rowid, b.rowid b_rowid, f.id, 3 a.name a_name, b.name b_name, num ...
创建定时刷新的物化视图:create materialized view mv_name refresh force on demand start with sysdate next sysdate+1 (指定物化视图每天刷新一次) 上述创建的物化视图每天刷新,但是没有指定刷新时间,如果要指定刷新时间(比如每天晚上10:00定时刷新一次):create materialized view mv_name refresh force on demand sta...
Fast refresh capability was therefore an essential prerequisite for CDL when we switched from Oracle to PostgreSQL. Fast refresh vs. complete refresh Fast refresh uses materialized view logs on the underlying tables to keep track of changes, and only the changes since the last refresh ...
Avoid the need to grant superuser privileges by using the pg_maintain role for VACUUM, ANALYZE, CLUSTER, REFRESH MATERIALIZED VIEW, REINDEX, and LOCK TABLE; alternatively, MAINTAIN privilege can be granted to users on a table Make TLS connections without a network round trip negotiation ALTER SYS...