近日,一19c oracle rac测试环境,初始反馈是sys用户查询很快,cdb用户如c##any查询系统表如all_tables很慢,至少相差几十倍、有时候直接半天超时还没执行完,经查一开始发现在等待gc cr multi block mixed事件,该事件据官方解释,该事件时提升性能用的,如下: Oracle GC CR Multi Block Mixed 事件是一种用于提高Oracle...
select * from ALL_TYPES -- 用户可存取的类型. select * from ALL_USERS -- 数据库中所有用户的信息 select * from ALL_USTATS --用户可存取的用户定义统计 select * from ALL_VARRAYS --用户可存取的所有数组 select * from ALL_VIEWS --用户可存取的视图的文本...
ALL_USER_VIEWS ALL视图描述用户可以访问的视图 USER_views USER视图描述用户所拥有的视图 在oracle中很多视图都是这样来命名的b比如 索引，表空间 等都是这样的，所以记住规律对于以后的学习是很有帮助的。
就是ORACLE存放所有表信息的视图。ALL_TABLES ALL_TABLES describes the relational tables accessible to the current user. To gather statistics for this view, use the ANALYZE SQL statement.Related Views DBA_TABLES describes all relational tables in the database.USER_TABLES describes the relati...
Oracle_Views.sql 包含如下几类 Oracle 兼容性视图:管理视图: ALL_*, DBA_*, USER_*ALL_ 视图当前与 DBA_ 视图一致,并未做权限检验,后期版本将会考虑权限校验。默认安装视图时,若内核字典中对象名为纯小写,则查询结果中转换为纯大写,大小写混合则不变。可在安装视图完成后,通过执行以下命令来还原成内核字典...
GRANTSELECTonALL_TABLEStooms_user;GRANTSELECTonALL_TAB_COLUMNStooms_user;GRANTSELECTonALL_TAB_PRIVStooms_user;GRANTSELECTonALL_TYPEStooms_user;GRANTSELECTonALL_USERStooms_user;GRANTSELECTonALL_VIEWStooms_user;GRANTSELECTonDUALtooms_user;GRANTSELECTonNLS_DATABASE_PARAMETERStooms_user;GRANTSELECTonPRODUCT_...
Oracle data dictionary-compatible views are automatically created when you create a database. This capability does not apply to the Entry plan of the Db2 Warehouse on Cloud managed service.
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Gain trusted and consistent information across the enterprise with a business representation of data using a shared semantic model, without compromising governance. Users access data through nontechnical business terms, predefined hierarchies, consistent calculations, and metrics. Create seamless views acrossda...
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