Oracle Materialized View是Oracle数据库中的一个对象,它是一个预先计算和存储的查询结果集。它类似于视图,但与视图不同的是,Materialized View在创建时会将查询...
o gathering more or stale statistics o indexes that might be VERY useful o query rewrites the access advisor o suggests indexes that might be useful (a possibly different set than the tuning advisor above) o materialized views o materialized view logs o partitions (in 11g on up only) SQL Ac...
SQL> create view vw_emp_readonly as select empno,ename from emp with read only; 》创建检查约束视图:对通过视图进行的增删改操作进行检查,要求增删改操作的数据必须是select查询所能查询到的数据。例(20号部门不在查询范围内,违反检查约束,所以无法插入): SQL> create view vw_emp_check as select empno,...
In addition, becausethe materialized view is manifested as a real table, anything that can be doneto a real table can be done to it, most importantly building indexes on anycolumn, enabling drastic speedups in query time. In a normal view, it’s typicallyonly possible to exploit indexes on...
In addition, becausethe materialized view is manifested as a real table, anything that can be doneto a real table can be done to it, most importantly building indexes on anycolumn, enabling drastic speedups in query time. In a normal view, it’s typicallyonly possible to exploit indexes on...
o suggests indexes that might be useful (a possibly different set than the tuning advisor above) o materialized views o materialized view logs o partitions (in 11g on up only) SQL Access Advisor可以通过DBMS_ADVISOR调用,SQL Tuning Advisor可以通过DBMS_SQLTUNE调用。
In the case of materialized views containing only joins using fast refresh, create indexes on the columns that contain the rowids to improve the performance of the refresh operation. If a materialized view using aggregates is fast refreshable, then an index appropriate for the fast refresh procedu...
ORA-12061: 无效的 ALTER MATERIALIZED VIEW 选项ORA-12062: 接收到的事务处理 在来自站点 的事务处理序列之外ORA-12063: 无法从站点 应用事务处理ORA-12064: 无效的刷新序列号:ORA-12065: 未知的刷新组标识符ORA-12066: CREATE MATERIALIZED VIEW 命令无效ORA-12067: 不允许刷新组为空ORA-12068: 用于实体化视图 ...
When you create a materialized view in PostgreSQL, it uses a regular database table underneath. You can create database indexes on the materialized view directly and improve performance of queries that access the materialized view. Example
ORA-12084: 必须使用 ALTER MATERIALIZED VIEW 来更改 ""."" ORA-12085: ""."" 上的实体化视图日志已有对象 ID ORA-12086: 表 ""."" 不是对象表 说明:创建物化视图日志采用WITH object id报错。 ORA-12087: 在 "" 拥有的表上不允许联机重新定义 ...