DBMS_MVIEW.REFRESH(MV_NAME,method =>'F'); 执行fast refresh, Oracle会首先识别当前主表和最后一次刷新 MV时候数据的变化,根据变化的数据更新 MV。当变化比较小的时候,Fast Refresh 比 Complete Refresh更加高效,因为数据量比较少。 因为fast refresh 时需要和最近一次更新
static MaterializedView.RefreshMethod valueOf(java.lang.String name) Returns the enum constant of this type with the specified name. static MaterializedView.RefreshMethod[] values() Returns an array containing the constants of this enum type, in the order they are declar...
REFRESH MATERIALIZED VIEW order_summary; 这个命令将释放与物化视图annual_statistics_basis相关 的存储并且让它变成一种不可扫描的状态: REFRESH MATERIALIZED VIEW annual_statistics_basis WITH NO DATA; 兼容性 REFRESH MATERIALIZED VIEW是一种 PostgreSQL扩展。
Change data that indicates information about changes made to different portions of one or more base tables and/or read data that indicates information about reads to different portions of the materialized view may be taken into account to determine which portion of a materialized view to refresh....
In the above example, the first copy of the materialized view is made at SYSDATE and the interval at which the refresh has to be performed is every two days. Summary Materialized Views thus offer us flexibility of basing a view on Primary key or ROWID, specifying refresh methods and specifyi...
REFRESH MATERIALIZED VIEW name [ WITH [ NO ] DATA ] 描述 REFRESH MATERIALIZED VIEW完全替换一个物化视图的内容。旧的内容被丢弃。如果声明了WITH DATA(或缺省),后端查询被执行以提供新的数据,物化视图留在可扫描的状态。如果声明了WITH NO DATA,那么不会产生新的数据,并且物化视图留在一个不可扫描的状态。
REFRESH MATERIALIZED VIEW VIEW会以全量刷新的方式对物化视图进行刷新。 注意事项 全量刷新既可以对全量物化视图执行,也可以对增量物化视图执行。 刷新物化视图需要当前用户拥有基表的SELECT权限。 语法格式 REFRESH MATERIALIZED VIEW mv_name; 参数说明 mv_name 要刷新的物化视图的名称。 来自:帮助中心 查看更多 ...
REFRESH MATERIALIZED VIEWmv_name Parameters mv_name The name of the materialized view to be refreshed. Usage notes Only the owner of a materialized view can perform aREFRESH MATERIALIZED VIEWoperation on that materialized view. Furthermore, the owner must have SELECT privilege on the underlying base...
REFRESH MATERIALIZED VIEW completely replaces the contents of a materialized view. To execute this command you must be the owner of the materialized view. The old contents are discarded. If WITH DATA is specified (or defaults) the backing query is executed to provide the new data, and the ma...
REFRESH { MATERIALIZED VIEW | [ STREAMING ] TABLE } table_name [ FULL | { SYNC | ASYNC }] 参数 table_name 标识要刷新的具体化视图或流式处理表。 名称不得包含时态规范或选项规范。 如果找不到对象,Azure Databricks 会引发TABLE_OR_VIEW_NOT_FOUND错误。